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High-spin states and possible chirality in the odd−ACs133 nucleus 奇数-Acs133 核的高自旋态和可能的手性
IF 3.1 2区 物理与天体物理 Q1 Physics and Astronomy
Physical Review C
Pub Date : 2024-08-05 DOI: 10.1103/physrevc.110.024301
H. Wang (王豪), K. Y. Ma (马克岩), D. Zhao (赵迪), J. Y. Li (李纪元), H. Y. Ye (叶欢仪), X. J. Zhao (赵新洁), J. X. Teng (滕佳欣), Z. Qiao (乔政), Y. C. Hao (郝宜春), Z. H. Zhao (赵子豪), H. C. Zhang (张会成), Y. K. Pan (潘禹坤), Y. J. Ma (马英君), J. B. Lu (陆景彬), Y. Zheng (郑云), C. B. Li (李聪博), T. X. Li (李天晓), X. G. Wu (吴晓光), H. Y. Wu (吴鸿毅), J. Z. Li (李金泽), R. Hong (洪锐), Z. Y. He (贺子阳), M. Zheng (郑敏), Y. Q. Li (李韵秋)
High-spin states of <math xmlns="http://www.w3.org/1998/Math/MathML"><mmultiscripts><mi>Cs</mi><mprescripts></mprescripts><none></none><mn>133</mn></mmultiscripts></math> have been studied using the fusion-evaporation reaction <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mmultiscripts><mi>Te</mi><mprescripts></mprescripts><none></none><mn>130</mn></mmultiscripts><mo>(</mo><mmultiscripts><mi>Li</mi><mprescripts></mprescripts><none></none><mn>7</mn></mmultiscripts><mo>,</mo><mspace width="0.16em"></mspace><mn>4</mn><mi>n</mi><mo>)</mo><mmultiscripts><mi>Cs</mi><mprescripts></mprescripts><none></none><mn>133</mn></mmultiscripts></mrow></math> at a beam energy of 32 MeV. The previously reported level scheme of <math xmlns="http://www.w3.org/1998/Math/MathML"><mmultiscripts><mi>Cs</mi><mprescripts></mprescripts><none></none><mn>133</mn></mmultiscripts></math> is extended and modified with the addition of nearly 30 new <math xmlns="http://www.w3.org/1998/Math/MathML"><mi>γ</mi></math> transitions. A pair of nearly degenerate positive-parity doublet bands are identified and assigned the same <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi>π</mi><msub><mi>d</mi><mrow><mn>5</mn><mo>/</mo><mn>2</mn></mrow></msub><mo>⊗</mo><mi>ν</mi><msubsup><mi>h</mi><mrow><mn>11</mn><mo>/</mo><mn>2</mn></mrow><mrow><mo>−</mo><mn>2</mn></mrow></msubsup></mrow></math> configuration. The properties of both bands show general agreement with the fingerprints of chiral rotation, and thus the bands are suggested as candidate chiral doublet bands. This interpretation is also supported by the particle rotor model calculations. In addition, the high-<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>j</mi></math> intruder <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi>π</mi><msub><mi>h</mi><mrow><mn>11</mn><mo>/</mo><mn>2</mn></mrow></msub></mrow></math> band is extended to the <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mn>27</mn><mo>/</mo><msup><mn>2</mn><mo>−</mo></msup></mrow></math> state. A new decoupled <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi mathvariant="normal">Δ</mi><mi>I</mi><mo>=</mo><mn>2</mn></mrow></math> sequence and a weak positive-parity band with magnetic dipole <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mo>(</mo><mi>M</mi><mn>1</mn><mo>)</mo></mrow></math> transitions are observed. The former is tentatively assigned the <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi>π</mi><msub><mi>d</mi><mrow><mn>5</mn><mo>/</mo><mn>2</mn></mrow></msub><msubsup><mi>h</mi><mrow><mn>11</mn><mo>/</mo><mn>2</mn></mrow><mn>2</mn></msubsup></mrow></math> configuration. Meanwhile, the systematic studies of the <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi>π</mi><msub><mi>d</mi><mrow><mn>5</mn><mo>/</mo><mn>2</mn></mrow></msub></mrow></math>, <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi>π</mi><msub><mi>g</mi><mrow><mn>7</mn><mo>/</mo><mn>2</mn></mrow></msub></mrow></ma
利用聚变-蒸发反应 Te130(Li7,4n)Cs133，在 32 MeV 的束流能量下研究了 Cs133 的高自旋态。由于增加了近 30 个新的γ跃迁，先前报告的 Cs133 水平方案得到了扩展和修改。发现了一对近乎退化的正奇偶双带，并赋予其相同的 πd5/2⊗νh11/2-2 构型。这两个波段的性质与手性旋转的指纹基本一致，因此被认为是候选的手性双波段。粒子转子模型的计算也支持这一解释。此外，高 j 入侵者 πh11/2 带扩展到了 27/2- 态。观察到一个新的解耦 ΔI=2 序列和一个带有磁偶极（M1）转换的弱正奇偶带。前者被暂定为πd5/2h11/22构型。同时，本文还讨论了奇数-A Cs 同位素中 πd5/2、πg7/2 和 πh11/2 带的系统研究。
{"title":"High-spin states and possible chirality in the odd−ACs133 nucleus","authors":"H. Wang (王豪), K. Y. Ma (马克岩), D. Zhao (赵迪), J. Y. Li (李纪元), H. Y. Ye (叶欢仪), X. J. Zhao (赵新洁), J. X. Teng (滕佳欣), Z. Qiao (乔政), Y. C. Hao (郝宜春), Z. H. Zhao (赵子豪), H. C. Zhang (张会成), Y. K. Pan (潘禹坤), Y. J. Ma (马英君), J. B. Lu (陆景彬), Y. Zheng (郑云), C. B. Li (李聪博), T. X. Li (李天晓), X. G. Wu (吴晓光), H. Y. Wu (吴鸿毅), J. Z. Li (李金泽), R. Hong (洪锐), Z. Y. He (贺子阳), M. Zheng (郑敏), Y. Q. Li (李韵秋)","doi":"10.1103/physrevc.110.024301","DOIUrl":"https://doi.org/10.1103/physrevc.110.024301","url":null,"abstract":"High-spin states of &lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mmultiscripts&gt;&lt;mi&gt;Cs&lt;/mi&gt;&lt;mprescripts&gt;&lt;/mprescripts&gt;&lt;none&gt;&lt;/none&gt;&lt;mn&gt;133&lt;/mn&gt;&lt;/mmultiscripts&gt;&lt;/math&gt; have been studied using the fusion-evaporation reaction &lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mrow&gt;&lt;mmultiscripts&gt;&lt;mi&gt;Te&lt;/mi&gt;&lt;mprescripts&gt;&lt;/mprescripts&gt;&lt;none&gt;&lt;/none&gt;&lt;mn&gt;130&lt;/mn&gt;&lt;/mmultiscripts&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mmultiscripts&gt;&lt;mi&gt;Li&lt;/mi&gt;&lt;mprescripts&gt;&lt;/mprescripts&gt;&lt;none&gt;&lt;/none&gt;&lt;mn&gt;7&lt;/mn&gt;&lt;/mmultiscripts&gt;&lt;mo&gt;,&lt;/mo&gt;&lt;mspace width=\"0.16em\"&gt;&lt;/mspace&gt;&lt;mn&gt;4&lt;/mn&gt;&lt;mi&gt;n&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;mmultiscripts&gt;&lt;mi&gt;Cs&lt;/mi&gt;&lt;mprescripts&gt;&lt;/mprescripts&gt;&lt;none&gt;&lt;/none&gt;&lt;mn&gt;133&lt;/mn&gt;&lt;/mmultiscripts&gt;&lt;/mrow&gt;&lt;/math&gt; at a beam energy of 32 MeV. The previously reported level scheme of &lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mmultiscripts&gt;&lt;mi&gt;Cs&lt;/mi&gt;&lt;mprescripts&gt;&lt;/mprescripts&gt;&lt;none&gt;&lt;/none&gt;&lt;mn&gt;133&lt;/mn&gt;&lt;/mmultiscripts&gt;&lt;/math&gt; is extended and modified with the addition of nearly 30 new &lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mi&gt;γ&lt;/mi&gt;&lt;/math&gt; transitions. A pair of nearly degenerate positive-parity doublet bands are identified and assigned the same &lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mrow&gt;&lt;mi&gt;π&lt;/mi&gt;&lt;msub&gt;&lt;mi&gt;d&lt;/mi&gt;&lt;mrow&gt;&lt;mn&gt;5&lt;/mn&gt;&lt;mo&gt;/&lt;/mo&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;mo&gt;⊗&lt;/mo&gt;&lt;mi&gt;ν&lt;/mi&gt;&lt;msubsup&gt;&lt;mi&gt;h&lt;/mi&gt;&lt;mrow&gt;&lt;mn&gt;11&lt;/mn&gt;&lt;mo&gt;/&lt;/mo&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mo&gt;−&lt;/mo&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;/msubsup&gt;&lt;/mrow&gt;&lt;/math&gt; configuration. The properties of both bands show general agreement with the fingerprints of chiral rotation, and thus the bands are suggested as candidate chiral doublet bands. This interpretation is also supported by the particle rotor model calculations. In addition, the high-&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mi&gt;j&lt;/mi&gt;&lt;/math&gt; intruder &lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mrow&gt;&lt;mi&gt;π&lt;/mi&gt;&lt;msub&gt;&lt;mi&gt;h&lt;/mi&gt;&lt;mrow&gt;&lt;mn&gt;11&lt;/mn&gt;&lt;mo&gt;/&lt;/mo&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt; band is extended to the &lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mrow&gt;&lt;mn&gt;27&lt;/mn&gt;&lt;mo&gt;/&lt;/mo&gt;&lt;msup&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;mo&gt;−&lt;/mo&gt;&lt;/msup&gt;&lt;/mrow&gt;&lt;/math&gt; state. A new decoupled &lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mrow&gt;&lt;mi mathvariant=\"normal\"&gt;Δ&lt;/mi&gt;&lt;mi&gt;I&lt;/mi&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;/math&gt; sequence and a weak positive-parity band with magnetic dipole &lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;M&lt;/mi&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/math&gt; transitions are observed. The former is tentatively assigned the &lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mrow&gt;&lt;mi&gt;π&lt;/mi&gt;&lt;msub&gt;&lt;mi&gt;d&lt;/mi&gt;&lt;mrow&gt;&lt;mn&gt;5&lt;/mn&gt;&lt;mo&gt;/&lt;/mo&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;msubsup&gt;&lt;mi&gt;h&lt;/mi&gt;&lt;mrow&gt;&lt;mn&gt;11&lt;/mn&gt;&lt;mo&gt;/&lt;/mo&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/msubsup&gt;&lt;/mrow&gt;&lt;/math&gt; configuration. Meanwhile, the systematic studies of the &lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mrow&gt;&lt;mi&gt;π&lt;/mi&gt;&lt;msub&gt;&lt;mi&gt;d&lt;/mi&gt;&lt;mrow&gt;&lt;mn&gt;5&lt;/mn&gt;&lt;mo&gt;/&lt;/mo&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;, &lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mrow&gt;&lt;mi&gt;π&lt;/mi&gt;&lt;msub&gt;&lt;mi&gt;g&lt;/mi&gt;&lt;mrow&gt;&lt;mn&gt;7&lt;/mn&gt;&lt;mo&gt;/&lt;/mo&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/ma","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":"12 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141937955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Electroproduction of the Λ/Σ0 hyperons at Q2≃0.5 (GeV/c)2 at forward angles Q2≃0.5（GeV/c）2 的Λ/Σ0 超子在前向角度的电致发射
IF 3.1 2区 物理与天体物理 Q1 Physics and Astronomy
Physical Review C
Pub Date : 2024-08-05 DOI: 10.1103/physrevc.110.025203
K. Okuyamaet al.(JLab Hypernuclear Collaboration)
In 2018, the E12-17-003 experiment was conducted at the Thomas Jefferson National Accelerator Facility (JLab) to explore the possible existence of an <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi>n</mi><mi>n</mi><mi mathvariant="normal">Λ</mi></mrow></math> state in the reconstructed missing mass distribution from a tritium gas target [K. N. Suzuki <i>et al.</i>, <span>Prog. Theor. Exp. Phys.</span> <b>2022</b>, 013D01 (2022); B. Pandey <i>et al.</i>, <span>Phys. Rev. C</span> <b>105</b>, L051001 (2022)]. As part of this investigation, data were also collected using a gaseous hydrogen target, not only for a precise absolute mass scale calibration but also for the study of <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi mathvariant="normal">Λ</mi><mo>/</mo><msup><mi mathvariant="normal">Σ</mi><mn>0</mn></msup></mrow></math> electroproduction. This dataset was acquired at <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><msup><mi>Q</mi><mn>2</mn></msup><mo>≃</mo><mn>0.5</mn></mrow></math> <math xmlns="http://www.w3.org/1998/Math/MathML"><msup><mrow><mo>(</mo><mi>GeV</mi><mo>/</mo><mi>c</mi><mo>)</mo></mrow><mn>2</mn></msup></math>, <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi>W</mi><mo>=</mo><mn>2.14</mn></mrow></math> GeV, and <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><msubsup><mi>θ</mi><mrow><mi>γ</mi><mi mathvariant="normal">K</mi></mrow><mrow><mi mathvariant="normal">c</mi><mo>.</mo><mi mathvariant="normal">m</mi><mo>.</mo></mrow></msubsup><mo>≃</mo><msup><mn>8</mn><mo>∘</mo></msup></mrow></math>. It covers forward angles where photoproduction data are scarce and a low-<math xmlns="http://www.w3.org/1998/Math/MathML"><msup><mi>Q</mi><mn>2</mn></msup></math> region that is of interest for hypernuclear experiments. On the other hand, this kinematic region is at a slightly higher <math xmlns="http://www.w3.org/1998/Math/MathML"><msup><mi>Q</mi><mn>2</mn></msup></math> than previous hypernuclear experiments, thus providing crucial information for understanding the <math xmlns="http://www.w3.org/1998/Math/MathML"><msup><mi>Q</mi><mn>2</mn></msup></math> dependence of the differential cross sections for <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi mathvariant="normal">Λ</mi><mo>/</mo><msup><mi mathvariant="normal">Σ</mi><mn>0</mn></msup></mrow></math> hyperon electroproduction. This paper reports on the <math xmlns="http://www.w3.org/1998/Math/MathML"><msup><mi>Q</mi><mn>2</mn></msup></math> dependence of the differential cross section for the <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi>e</mi><mo>+</mo><mi>p</mi><mo>→</mo><msup><mi>e</mi><mo>′</mo></msup><mo>+</mo><msup><mi>K</mi><mo>+</mo></msup><mo>+</mo><mi mathvariant="normal">Λ</mi><mo>/</mo><msup><mi mathvariant="normal">Σ</mi><mn>0</mn></msup></mrow></math> reaction at <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mn>0.2</mn><mo>–</mo><mn>0.8</mn></mrow></math> <math xmlns="http://www.w3.org/1998/Ma
2018 年，托马斯-杰斐逊国家加速器设施（JLab）进行了 E12-17-003 实验，以探索氚气体靶重建的缺失质量分布中可能存在的 nnΛ 态 [K. N. Suzuki 等人，Prog.N. Suzuki 等人，Prog.Theor.Exp.2022, 013D01 (2022)；B. Pandey 等人，Phys. Rev. C 105, L051001 (2022)]。作为这项研究的一部分，还利用气态氢目标收集了数据，不仅是为了进行精确的绝对质量标度校准，也是为了研究Λ/Σ0电致发光。该数据集是在 Q2≃0.5（GeV/c）2、W=2.14 GeV 和 θγKc.m.≃8∘ 时获得的。它涵盖了光生成数据稀缺的前向角度和超核实验感兴趣的低 Q2 区域。另一方面，这一运动学区域的 Q2 比以前的超核实验略高，因此为理解Λ/Σ0 超子电导的微分截面的 Q2 依赖性提供了关键信息。本文报告了 0.2-0.8 (GeV/c)2 时 e+p→e′+K++Λ/Σ0 反应的微分截面的 Q2 依赖性，并提供了与现有理论模型的比较。
{"title":"Electroproduction of the Λ/Σ0 hyperons at Q2≃0.5 (GeV/c)2 at forward angles","authors":"K. Okuyamaet al.(JLab Hypernuclear Collaboration)","doi":"10.1103/physrevc.110.025203","DOIUrl":"https://doi.org/10.1103/physrevc.110.025203","url":null,"abstract":"In 2018, the E12-17-003 experiment was conducted at the Thomas Jefferson National Accelerator Facility (JLab) to explore the possible existence of an &lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mrow&gt;&lt;mi&gt;n&lt;/mi&gt;&lt;mi&gt;n&lt;/mi&gt;&lt;mi mathvariant=\"normal\"&gt;Λ&lt;/mi&gt;&lt;/mrow&gt;&lt;/math&gt; state in the reconstructed missing mass distribution from a tritium gas target [K. N. Suzuki &lt;i&gt;et al.&lt;/i&gt;, &lt;span&gt;Prog. Theor. Exp. Phys.&lt;/span&gt; &lt;b&gt;2022&lt;/b&gt;, 013D01 (2022); B. Pandey &lt;i&gt;et al.&lt;/i&gt;, &lt;span&gt;Phys. Rev. C&lt;/span&gt; &lt;b&gt;105&lt;/b&gt;, L051001 (2022)]. As part of this investigation, data were also collected using a gaseous hydrogen target, not only for a precise absolute mass scale calibration but also for the study of &lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mrow&gt;&lt;mi mathvariant=\"normal\"&gt;Λ&lt;/mi&gt;&lt;mo&gt;/&lt;/mo&gt;&lt;msup&gt;&lt;mi mathvariant=\"normal\"&gt;Σ&lt;/mi&gt;&lt;mn&gt;0&lt;/mn&gt;&lt;/msup&gt;&lt;/mrow&gt;&lt;/math&gt; electroproduction. This dataset was acquired at &lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mrow&gt;&lt;msup&gt;&lt;mi&gt;Q&lt;/mi&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/msup&gt;&lt;mo&gt;≃&lt;/mo&gt;&lt;mn&gt;0.5&lt;/mn&gt;&lt;/mrow&gt;&lt;/math&gt; &lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;msup&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;GeV&lt;/mi&gt;&lt;mo&gt;/&lt;/mo&gt;&lt;mi&gt;c&lt;/mi&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/msup&gt;&lt;/math&gt;, &lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mrow&gt;&lt;mi&gt;W&lt;/mi&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;mn&gt;2.14&lt;/mn&gt;&lt;/mrow&gt;&lt;/math&gt; GeV, and &lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mrow&gt;&lt;msubsup&gt;&lt;mi&gt;θ&lt;/mi&gt;&lt;mrow&gt;&lt;mi&gt;γ&lt;/mi&gt;&lt;mi mathvariant=\"normal\"&gt;K&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi mathvariant=\"normal\"&gt;c&lt;/mi&gt;&lt;mo&gt;.&lt;/mo&gt;&lt;mi mathvariant=\"normal\"&gt;m&lt;/mi&gt;&lt;mo&gt;.&lt;/mo&gt;&lt;/mrow&gt;&lt;/msubsup&gt;&lt;mo&gt;≃&lt;/mo&gt;&lt;msup&gt;&lt;mn&gt;8&lt;/mn&gt;&lt;mo&gt;∘&lt;/mo&gt;&lt;/msup&gt;&lt;/mrow&gt;&lt;/math&gt;. It covers forward angles where photoproduction data are scarce and a low-&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;msup&gt;&lt;mi&gt;Q&lt;/mi&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/msup&gt;&lt;/math&gt; region that is of interest for hypernuclear experiments. On the other hand, this kinematic region is at a slightly higher &lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;msup&gt;&lt;mi&gt;Q&lt;/mi&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/msup&gt;&lt;/math&gt; than previous hypernuclear experiments, thus providing crucial information for understanding the &lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;msup&gt;&lt;mi&gt;Q&lt;/mi&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/msup&gt;&lt;/math&gt; dependence of the differential cross sections for &lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mrow&gt;&lt;mi mathvariant=\"normal\"&gt;Λ&lt;/mi&gt;&lt;mo&gt;/&lt;/mo&gt;&lt;msup&gt;&lt;mi mathvariant=\"normal\"&gt;Σ&lt;/mi&gt;&lt;mn&gt;0&lt;/mn&gt;&lt;/msup&gt;&lt;/mrow&gt;&lt;/math&gt; hyperon electroproduction. This paper reports on the &lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;msup&gt;&lt;mi&gt;Q&lt;/mi&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;/msup&gt;&lt;/math&gt; dependence of the differential cross section for the &lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mrow&gt;&lt;mi&gt;e&lt;/mi&gt;&lt;mo&gt;+&lt;/mo&gt;&lt;mi&gt;p&lt;/mi&gt;&lt;mo&gt;→&lt;/mo&gt;&lt;msup&gt;&lt;mi&gt;e&lt;/mi&gt;&lt;mo&gt;′&lt;/mo&gt;&lt;/msup&gt;&lt;mo&gt;+&lt;/mo&gt;&lt;msup&gt;&lt;mi&gt;K&lt;/mi&gt;&lt;mo&gt;+&lt;/mo&gt;&lt;/msup&gt;&lt;mo&gt;+&lt;/mo&gt;&lt;mi mathvariant=\"normal\"&gt;Λ&lt;/mi&gt;&lt;mo&gt;/&lt;/mo&gt;&lt;msup&gt;&lt;mi mathvariant=\"normal\"&gt;Σ&lt;/mi&gt;&lt;mn&gt;0&lt;/mn&gt;&lt;/msup&gt;&lt;/mrow&gt;&lt;/math&gt; reaction at &lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mrow&gt;&lt;mn&gt;0.2&lt;/mn&gt;&lt;mo&gt;–&lt;/mo&gt;&lt;mn&gt;0.8&lt;/mn&gt;&lt;/mrow&gt;&lt;/math&gt; &lt;math xmlns=\"http://www.w3.org/1998/Ma","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":"1 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141937873","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Investigation of the determination of nuclear deformation using high-energy heavy-ion scattering 利用高能重离子散射测定核变形的研究
IF 3.1 2区 物理与天体物理 Q1 Physics and Astronomy
Physical Review C
Pub Date : 2024-08-05 DOI: 10.1103/physrevc.110.024604
Shin Watanabe, Takenori Furumoto, Wataru Horiuchi, Tadahiro Suhara, Yasutaka Taniguchi
Background: Nuclear deformation provides a crucial characteristic of nuclear structure. Conventionally, the quadrupole deformation length of a nucleus, δ2, has often been determined based on a macroscopic model through a deformed nuclear potential with the deformation length δ2(pot), which is determined to reproduce the nuclear scattering data. This approach assumes δ2=δ2(pot) although there is no theoretical foundation.
背景：核变形是核结构的一个重要特征。传统上，核的四极子形变长度δ2 通常是通过形变核势的宏观模型确定的，形变长度δ2(pot)的确定是为了再现核散射数据。这种方法假设 δ2=δ2(pot) 虽然没有理论基础。
{"title":"Investigation of the determination of nuclear deformation using high-energy heavy-ion scattering","authors":"Shin Watanabe, Takenori Furumoto, Wataru Horiuchi, Tadahiro Suhara, Yasutaka Taniguchi","doi":"10.1103/physrevc.110.024604","DOIUrl":"https://doi.org/10.1103/physrevc.110.024604","url":null,"abstract":"<b>Background:</b> Nuclear deformation provides a crucial characteristic of nuclear structure. Conventionally, the quadrupole deformation length of a nucleus, <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>δ</mi><mn>2</mn></msub></math>, has often been determined based on a macroscopic model through a deformed nuclear potential with the deformation length <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msubsup><mi>δ</mi><mn>2</mn><mrow><mo>(</mo><mi>pot</mi><mo>)</mo></mrow></msubsup></math>, which is determined to reproduce the nuclear scattering data. This approach assumes <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><msub><mi>δ</mi><mn>2</mn></msub><mo>=</mo><msubsup><mi>δ</mi><mn>2</mn><mrow><mo>(</mo><mi>pot</mi><mo>)</mo></mrow></msubsup></mrow></math> although there is no theoretical foundation.","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":"32 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141937959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Electromagnetic fields in low-energy heavy-ion collisions with baryon stopping 低能重离子碰撞中的电磁场与重子停止
IF 3.1 2区 物理与天体物理 Q1 Physics and Astronomy
Physical Review C
Pub Date : 2024-08-05 DOI: 10.1103/physrevc.110.024902
Ankit Kumar Panda, Partha Bagchi, Hiranmaya Mishra, Victor Roy
We investigate the impact of baryon stopping on the temporal evolution of electromagnetic fields in vacuum at low-energy Au+Au collisions with sNN=4–20GeV. Baryon stopping is incorporated into the Monte Carlo Glauber model by employing a parametrized velocity profile of participant nucleons with nonzero deceleration. The presence of these decelerating participants leads to noticeable changes in the centrality and sNN dependence of electromagnetic fields compared to scenarios with vanishing deceleration. The influence of baryon stopping differs for electric and magnetic fields, also exhibiting variations across their components. We observe slight alteration in the approximate linear dependency of field strengths with sNN in the presence of deceleration. Additionally, the longitudinal component of the electric field at late times becomes significant in the presence of baryon stopping.
我们研究了在 sNN=4-20GeV 的低能 Au+Au 对撞中重子停止对真空中电磁场的时间演化的影响。通过采用非零减速参与核子的参数化速度曲线，将重子停止纳入蒙特卡洛格劳伯模型。与减速消失的情况相比，这些减速参与者的存在导致电磁场的中心性和 sNN 依赖性发生明显变化。重子停止对电场和磁场的影响各不相同，它们的各组成部分也表现出差异。我们观察到，在存在减速的情况下，场强与 sNN 的近似线性关系略有改变。此外，在重子停止的情况下，电场的纵向分量在晚期变得很重要。
{"title":"Electromagnetic fields in low-energy heavy-ion collisions with baryon stopping","authors":"Ankit Kumar Panda, Partha Bagchi, Hiranmaya Mishra, Victor Roy","doi":"10.1103/physrevc.110.024902","DOIUrl":"https://doi.org/10.1103/physrevc.110.024902","url":null,"abstract":"We investigate the impact of baryon stopping on the temporal evolution of electromagnetic fields in vacuum at low-energy Au+Au collisions with <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><msqrt><msub><mi>s</mi><mrow><mi>N</mi><mi>N</mi></mrow></msub></msqrt><mo>=</mo><mn>4</mn><mo>–</mo><mn>20</mn><mspace width=\"0.16em\"></mspace><mi>GeV</mi></mrow></math>. Baryon stopping is incorporated into the Monte Carlo Glauber model by employing a parametrized velocity profile of participant nucleons with nonzero deceleration. The presence of these decelerating participants leads to noticeable changes in the centrality and <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msqrt><msub><mi>s</mi><mrow><mi>N</mi><mi>N</mi></mrow></msub></msqrt></math> dependence of electromagnetic fields compared to scenarios with vanishing deceleration. The influence of baryon stopping differs for electric and magnetic fields, also exhibiting variations across their components. We observe slight alteration in the approximate linear dependency of field strengths with <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msqrt><msub><mi>s</mi><mrow><mi>N</mi><mi>N</mi></mrow></msub></msqrt></math> in the presence of deceleration. Additionally, the longitudinal component of the electric field at late times becomes significant in the presence of baryon stopping.","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":"22 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141937958","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Investigating the impact of nuclear surface energy coefficients on one-proton radioactivity 研究核表面能系数对一质子放射性的影响
IF 3.1 2区 物理与天体物理 Q1 Physics and Astronomy
Physical Review C
Pub Date : 2024-08-05 DOI: 10.1103/physrevc.110.024603
R. Gharaei, Kh. Haghighi Pour, N. Ghal-Eh
The influence of different nuclear surface energy coefficients γ on the process of proton radioactivity is systematically studied within the Coulomb and proximity potential formalism. We investigate the proximity potential Guo 2013 formalism with 13 different versions of the coefficient γ for the description of 44 experimental half-lives of proton emitters in the ground and isomeric states. It has been observed that the four versions, namely Guo 2013 (original), Guo 2013 (set 1), Guo 2013 (set 2), and Guo 2013 (set 3), exhibit the lowest rms deviations (approximately σ=0.4733) when compared to the experimental data. The detailed investigation of the known proton decay processes indicate that the decrease in the strength of nuclear surface tension improves the agreement between the experimental data and the calculated values of proton radioactivity half-lives. In addition, our results reveal that the apparent deviation does not follow a continuous behavior around Z=68. In fact, by decreasing the strength of the surface energy coefficient γ compared to its calculated value from the original proximity potential (Guo 2013) for lighter mass regions (Z<68) and increasing it for heavier ones (Z>68), we observe significantly improved agreement with experimental data (σ=0.453). A discussion about the role of nuclear surface tension coefficients in the experimental information of proton emitters in the ground state and the isomeric state is also presented.
我们在库仑和邻近势形式主义中系统地研究了不同核表面能系数γ对质子放射性过程的影响。我们用 13 种不同版本的系数 γ 研究了郭 2013 的接近势形式主义，以描述质子发射体在基态和同分异构态下的 44 个实验半衰期。研究发现，与实验数据相比，Guo 2013（原始）、Guo 2013（集合 1）、Guo 2013（集合 2）和 Guo 2013（集合 3）这四个版本的均方根偏差最小（约为 σ=0.4733）。对已知质子衰变过程的详细研究表明，核表面张力强度的降低提高了实验数据与质子放射性半衰期计算值之间的一致性。此外，我们的结果表明，在 Z=68 附近，明显的偏差并不是连续的。事实上，在质量较轻的区域（Z<68），通过降低表面能系数γ的强度（与原始接近势（郭，2013 年）的计算值相比），在质量较重的区域（Z>68），通过增加表面能系数γ的强度，我们观察到与实验数据的一致性显著提高（σ=0.453）。我们还讨论了核表面张力系数在基态和异构态质子发射体实验信息中的作用。
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引用次数: 0
Wave function of Be9 in the three-body (ααn) model 三体（ααn）模型中 Be9 的波函数
IF 3.1 2区 物理与天体物理 Q1 Physics and Astronomy
Physical Review C
Pub Date : 2024-08-05 DOI: 10.1103/physrevc.110.024001
S. A. Rakityansky
A simple analytic expression of the three-body wave function describing the system (ααn) in the ground state 32− of Be9 is obtained. In doing this, it is assumed that the α particles interact with each other via the S-wave Ali-Bodmer potential including the Coulomb term, and the neutron-α forces act only in the P-wave state. This wave function is constructed by trial and error method via solving in this way a kind of inverse problem when the two-body αα potential is recovered from a postulated three-body wave function. As a result, the wave function is an exact solution of the corresponding three-body Schrödinger equation for experimentally known binding energy and for the αα potential whose difference from the Ali-Bodmer one is minimized by varying the adjustable parameters on which the postulated wave function depends.
我们得到了描述 Be9 基态 32- 系统 (ααn) 的三体波函数的简单解析表达式。在此过程中，假定 α 粒子通过包括库仑项在内的 S 波阿里-博德默势相互作用，而中子-α 力只作用于 P 波状态。这种波函数是通过试错法构建的，即从假定的三体波函数恢复二体 αα 势时，通过这种方法求解一种逆问题。因此，对于实验已知的结合能和αα势，波函数是相应的三体薛定谔方程的精确解，通过改变假定波函数所依赖的可调参数，可使其与αα势的差值最小化。
{"title":"Wave function of Be9 in the three-body (ααn) model","authors":"S. A. Rakityansky","doi":"10.1103/physrevc.110.024001","DOIUrl":"https://doi.org/10.1103/physrevc.110.024001","url":null,"abstract":"A simple analytic expression of the three-body wave function describing the system <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mo>(</mo><mi>α</mi><mi>α</mi><mi>n</mi><mo>)</mo></mrow></math> in the ground state <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mfrac><mn>3</mn><mn>2</mn></mfrac><mo>−</mo></msup></math> of <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi>Be</mi><mprescripts></mprescripts><none></none><mn>9</mn></mmultiscripts></math> is obtained. In doing this, it is assumed that the <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>α</mi></math> particles interact with each other via the <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>S</mi></math>-wave Ali-Bodmer potential including the Coulomb term, and the neutron-<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>α</mi></math> forces act only in the <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>P</mi></math>-wave state. This wave function is constructed by trial and error method via solving in this way a kind of inverse problem when the two-body <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>α</mi><mi>α</mi></mrow></math> potential is recovered from a postulated three-body wave function. As a result, the wave function is an exact solution of the corresponding three-body Schrödinger equation for experimentally known binding energy and for the <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>α</mi><mi>α</mi></mrow></math> potential whose difference from the Ali-Bodmer one is minimized by varying the adjustable parameters on which the postulated wave function depends.","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":"40 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141937957","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Examining the possibility that normal nuclear matter is quarkyonic 研究正常核物质是夸克质的可能性
IF 3.1 2区 物理与天体物理 Q1 Physics and Astronomy
Physical Review C
Pub Date : 2024-08-05 DOI: 10.1103/physrevc.110.025201
Volker Koch, Larry McLerran, Gerald A. Miller, Volodymyr Vovchenko
The possibility that nuclear matter might be quarkyonic is considered. Quarkyonic matter is high baryon density matter that is confined but can be approximately thought of as a filled Fermi sea of quarks surrounded by a shell of nucleons. Here, nuclear matter is described by the IdylliQ sigma model for quarkyonic matter, generalizing the noninteracting IdylliQ model [Y. Fujimoto et al., Phys. Rev. Lett. 132, 112701 (2024)] to include interactions with a σ meson and a pion. When such interactions are included, we find that isospin-symmetric nuclear matter binds with acceptable values of the compressibility and other parameters for nuclear matter at saturation. The energy per nucleon and sound velocity of such matter is computed, and the isospin dependence is determined. Nuclear matter is formed at a density close to but slightly above the density at which quarkyonic matter forms. Quarkyonic matter predicts a strong depletion of nucleons in normal nuclear matter at low momentum. Such a depletion for nucleon momenta k≲120 MeV is shown to be consistent with electron scattering data.
我们考虑了核物质可能是夸克物质的可能性。夸克物质是高重子密度物质，它是封闭的，但可以近似地认为是由核子外壳包围的充满夸克的费米海。在这里，核物质由夸克物质的 IdylliQ sigma 模型来描述，它概括了非相互作用的 IdylliQ 模型[Y. Fujimoto 等，Phys.当包括这些相互作用时，我们发现等时空对称核物质在饱和状态下与核物质的可压缩性和其他参数的可接受值结合在一起。我们计算了这种物质的单位核子能量和声速，并确定了其与等空素的关系。核物质形成的密度接近但略高于夸克物质形成的密度。夸克物质预言了正常核物质中核子在低动量时的强烈损耗。核子动量 k≲120 MeV 时的这种损耗与电子散射数据是一致的。
{"title":"Examining the possibility that normal nuclear matter is quarkyonic","authors":"Volker Koch, Larry McLerran, Gerald A. Miller, Volodymyr Vovchenko","doi":"10.1103/physrevc.110.025201","DOIUrl":"https://doi.org/10.1103/physrevc.110.025201","url":null,"abstract":"The possibility that nuclear matter might be quarkyonic is considered. Quarkyonic matter is high baryon density matter that is confined but can be approximately thought of as a filled Fermi sea of quarks surrounded by a shell of nucleons. Here, nuclear matter is described by the IdylliQ sigma model for quarkyonic matter, generalizing the noninteracting IdylliQ model [Y. Fujimoto <i>et al.</i>, <span>Phys. Rev. Lett.</span> <b>132</b>, 112701 (2024)] to include interactions with a <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>σ</mi></math> meson and a pion. When such interactions are included, we find that isospin-symmetric nuclear matter binds with acceptable values of the compressibility and other parameters for nuclear matter at saturation. The energy per nucleon and sound velocity of such matter is computed, and the isospin dependence is determined. Nuclear matter is formed at a density close to but slightly above the density at which quarkyonic matter forms. Quarkyonic matter predicts a strong depletion of nucleons in normal nuclear matter at low momentum. Such a depletion for nucleon momenta <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>k</mi><mo>≲</mo><mn>120</mn></mrow></math> MeV is shown to be consistent with electron scattering data.","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":"25 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141937960","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Significance of radiative corrections on measurements of the EMC effect 辐射修正对电磁兼容效应测量的意义
IF 3.1 2区 物理与天体物理 Q1 Physics and Astronomy
Physical Review C
Pub Date : 2024-08-05 DOI: 10.1103/physrevc.110.025202
S. Moran, M. Arratia, J. Arrington, D. Gaskell, B. Schmookler
Deep inelastic scattering from nuclear targets probes the parton distribution functions (PDFs) in nuclei. Comparisons of the PDFs from heavy nuclei and the deuteron show deviations that demonstrate a nontrivial nuclear dependence to these distributions, referred to as the EMC effect. A global analysis of the world's data on the EMC effect reveals tensions between different extractions. Precise measurements at Jefferson Lab, studying the dependence on both the quark momentum fraction, x, and nuclear mass, show systematic discrepancies among experiments, making the extraction of the A dependence of the EMC effect sensitive to the selection of datasets. By comparing various methods and assumptions used to calculate radiative corrections, we have identified differences that, while not large, significantly impact the EMC ratios and show that using a consistent radiative correction procedure resolves this discrepancy, leading to a more coherent global picture and allowing for a more robust extraction of the EMC effect for infinite nuclear matter.
来自核目标的深度非弹性散射探测了原子核中的粒子分布函数（PDF）。对重核和氘核的 PDFs 进行比较后发现，这些分布存在偏差，表明这些分布与核无关，被称为 EMC 效应。对世界上有关 EMC 效应的数据进行的全球分析表明，不同的提取方法之间存在着紧张关系。杰斐逊实验室的精确测量研究了夸克动量分数 x 和核质量的依赖性，结果显示不同实验之间存在系统性差异，这使得提取 EMC 效应的 A 依赖性对数据集的选择非常敏感。通过比较用于计算辐射修正的各种方法和假设，我们发现了一些差异，这些差异虽然不大，但对 EMC 比值有显著影响，并表明使用一致的辐射修正程序可以解决这种差异，从而获得更一致的全局图景，并允许对无限核物质的 EMC 效应进行更稳健的提取。
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引用次数: 0
Effect of nuclear deformation and orientation about the symmetry axis of the target nucleus on heavy-ion fusion dynamics 核变形和围绕靶核对称轴的取向对重离子聚变动力学的影响
IF 3.1 2区 物理与天体物理 Q1 Physics and Astronomy
Physical Review C
Pub Date : 2024-08-01 DOI: 10.1103/physrevc.110.024601
Shilpa Rana, M. Bhuyan, Raj Kumar, B. V. Carlson
Nuclear shape and orientation degrees of freedom are incorporated into the calculation of the double-folding nuclear potential within the relativistic mean-field (RMF) formalism. The quadrupole deformations (<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>β</mi><mn>2</mn></msub></math>), nuclear densities, and the effective nucleon-nucleon (<math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi>N</mi><mi>N</mi></mrow></math>) interaction potential are obtained using the RMF approach for the hybrid, <math xmlns="http://www.w3.org/1998/Math/MathML"><msup><mrow><mi>NL3</mi></mrow><mo>*</mo></msup></math>, and NL3 parametrizations. The calculated quadrupole deformations are included in the target densities through the nuclear radius. The deformation and orientation-dependent microscopic nuclear potentials are further employed to obtain fusion barrier characteristics and cross sections for 12 even-even heavy-ion reactions with doubly magic spherical <math xmlns="http://www.w3.org/1998/Math/MathML"><mmultiscripts><mi mathvariant="normal">O</mi><mprescripts></mprescripts><none></none><mn>16</mn></mmultiscripts></math> and <math xmlns="http://www.w3.org/1998/Math/MathML"><mmultiscripts><mi>Ca</mi><mprescripts></mprescripts><none></none><mn>48</mn></mmultiscripts></math> as projectiles along with deformed targets from different mass regions. The results obtained for the relativistic R3Y <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi>N</mi><mi>N</mi></mrow></math> potential are compared with those of the Reid version of the nonrelativistic M3Y <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi>N</mi><mi>N</mi></mrow></math> potential as well as with the available experimental data. A decrease in the barrier height and increase in the cross-section is observed upon the inclusion of target quadrupole deformations in the nuclear density distributions at the target orientation angles, <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><msub><mi>θ</mi><mn>2</mn></msub><mo>≤</mo><msup><mn>58</mn><mo>∘</mo></msup></mrow></math> for the R3Y <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi>N</mi><mi>N</mi></mrow></math> potential and at <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><msub><mi>θ</mi><mn>2</mn></msub><mo>≤</mo><msup><mn>60</mn><mo>∘</mo></msup></mrow></math> for the M3Y <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi>N</mi><mi>N</mi></mrow></math> potential. On comparing the <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>θ</mi><mn>2</mn></msub></math>-integrated cross section calculated using M3Y and R3Y <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi>N</mi><mi>N</mi></mrow></math> potentials with spherical and deformed densities, one observes that the deformed densities and the relativistic R3Y <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi>N</mi><mi>N</mi></mrow></math> potential obtained for the hybrid parameter set provide better agreement with
核形状和取向自由度被纳入相对论均场（RMF）形式主义的双折叠核势计算中。使用混合、NL3* 和 NL3 参数化的 RMF 方法获得了四极子变形（β2）、核密度和有效核子-核子（NN）相互作用势。通过核半径，计算出的四极子变形被包含在目标密度中。利用变形和取向相关的微观核势，进一步获得了以双魔球 O16 和 Ca48 为射弹的 12 个偶偶重离子反应的聚变势垒特性和截面，以及来自不同质量区域的变形靶。相对论 R3Y NN 势的结果与 Reid 版本的非相对论 M3Y NN 势的结果以及现有实验数据进行了比较。当在 R3Y NN 势的θ2≤58∘处和 M3Y NN 势的θ2≤60∘处的核密度分布中加入靶四极变形时，可以观察到势垒高度降低和截面增大。比较使用 M3Y 和 R3Y NN 势计算出的θ2-积分截面，以及球形密度和变形密度，可以发现混合参数集得到的变形密度和相对论 R3Y NN 势与所有考虑反应的现有实验数据更为吻合。此外，在形成较重化合物核的反应中，核形状自由度和取向的加入对聚变势垒特征的改变以及由此对截面的改变变得更加突出。这意味着在 RMF 形式中计算微观核势时纳入核变形和取向对于可靠描述亚屏障核聚变动力学至关重要，特别是在重质量和超重质量区域。
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引用次数: 0
Bayesian uncertainty quantification on nuclear level-density data and their impact on (p,γ) reactions of astrophysical interest 核级密度数据的贝叶斯不确定性量化及其对具有天体物理学意义的（p,γ）反应的影响
IF 3.1 2区 物理与天体物理 Q1 Physics and Astronomy
Physical Review C
Pub Date : 2024-08-01 DOI: 10.1103/physrevc.110.024602
A. Chalil, C. Ducoin, O. Stézowski, N. Millard-Pinard, J. Dudouet, Y. Demane, M. Chamseddine
The p process nucleosynthesis is responsible for the synthesis of 35 neutron-deficient nuclei from Se35 to Hg196. An important input that can affect the modeling of this process is the nuclear level density at the relevant excitation energies of the nuclei involved in the reaction network. The oslo method has been extensively used for the measurement of level densities in excitation energies of several MeV. In this work, Bayesian optimization has been used in order to estimate the 95% credible intervals for the parameters of two level-density models optimized on the oslo data. These uncertainties are then propagated on the cross sections of (p,γ) reactions leading to the compound nuclei Pd105,106 and Cd105,106 inside the astrophysically relevant energy range. Imposing constraints in this region of the isotopic chart is important for network calculations involving the nearby p nuclei Pd102 and Cd106. We discuss the reduction of the range of cross sections due to the uncertainties arising from the level-density data compared to the range of the six default level-density models available in talys and we highlight the need for level-density data inside the astrophysically relevant energy ranges.
p 过程核合成负责合成从 Se35 到 Hg196 的 35 个缺中子原子核。影响这一过程建模的一个重要输入是参与反应网络的原子核在相关激发能量下的核级密度。奥斯陆方法已被广泛用于测量几 MeV 激发能量下的核级密度。在这项工作中，使用了贝叶斯优化法来估计根据奥斯陆数据优化的两个能级密度模型参数的 95% 可信区间。然后将这些不确定性传播到天体物理学相关能量范围内导致 Pd105,106 和 Cd105,106 复合核的（p,γ）反应截面上。在同位素图的这一区域施加约束对于涉及附近 p 核 Pd102 和 Cd106 的网络计算非常重要。我们讨论了与 talys 中可用的六个默认水平密度模型的范围相比，由于水平密度数据引起的不确定性而导致的截面范围的缩小，并强调了在天体物理学相关能量范围内对水平密度数据的需求。
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