Nuclear Physics A最新文献_第8页

Lifetime measurements with fast timing scintillation detectors at VECC, Kolkata 加尔各答VECC快速计时闪烁探测器的寿命测量

IF 2.5 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A

Pub Date : 2025-10-01 DOI: 10.1016/j.nuclphysa.2025.123254

T. Bhattacharjee , A. Pal , D. Kumar , S. Basak , S.S. Alam

The developments on lifetime measurements with fast timing scintillation detectors at VECC, Kolkata has been discussed. Different aspects of the

γ - γ

fast timing facility VENTURE (VECC array for Nuclear fast Timing and angUlar corRElation studies) has been outlined in the light of level lifetime measurement with electronic fast timing technique. The exotic structures of the nuclei with A

\sim

130 and A

\sim

150, studied using the fast timing setups, have been elaborated. The plan for future development of the second phase of VENTURE, i.e. VENTURE-2.0 has been shown along with its progress till date.

本文讨论了加尔各答VECC快速计时闪烁探测器在寿命测量方面的进展。在用电子快定时技术测量能级寿命的情况下，概述了γ−γ快定时设施VENTURE（用于核快定时和角相关研究的VECC阵列）的不同方面。利用快速定时装置研究了A ~ 130和A ~ 150核的奇异结构。VENTURE第二阶段的未来发展计划，即VENTURE-2.0，已经与目前的进展一起展示。

引用次数: 0

The 7Be(d, α)5Li(p α) and 7Be(d, p)8Be*(p 7Li) reactions at 5 MeV/u 5mev /u下7Be(d, α)5Li（p α）和7Be(d, p)8Be*(p 7Li)反应

IF 2.5 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A

Pub Date : 2025-09-28 DOI: 10.1016/j.nuclphysa.2025.123249

S. Samanta , D. Gupta , Sk. M. Ali , R. Mitra , K. Kundalia , S. Maity , N. Ghosh , S.K. Saha , O. Tengblad , A. Perea , I. Martel , J. Cederkall

The

^{7}

Be(d,

α)^{5}

Li and

^{7}

Be(d, p)

^{8}

Be

^{*}

(p

^{7}

Li) reactions are studied at 5 MeV/u in the context of the cosmological lithium problem. This work aims to probe the contribution of

^{7}

Be destruction mechanisms, particularly through channels that populate intermediate unbound states of

^{5}

Li and

^{8}

Be. The contribution of

^{7}

Be(d,

α

)

^{5}

Li(p

α

) reaction is separated from the

^{7}

Be(d, p)

^{8}

Be

^{*} (2 α)

reaction. The

^{7}

Be(d, p)

^{8}

Be

^{*}

(p

_{1}

^{7}

Li

^{*}

) channel is also identified and is useful for an indirect study of the

^{7}

Be(n, p

_{1})^{7}

Li

^{*}

reaction.

在宇宙锂问题的背景下，研究了7Be(d, α)5Li和7Be(d, p)8Be*(p 7Li)在5 MeV/u下的反应。这项工作旨在探索7Be破坏机制的贡献，特别是通过填充5Li和8Be的中间非束缚态的通道。7Be(d, α)5Li（p α）反应的贡献从7Be(d, p)8Be*(2α)反应中分离出来。还鉴定了7Be(d, p)8Be*(p1 7Li*)通道，该通道可用于间接研究7Be(n, p1)7Li*反应。

引用次数: 0

Breakup and isotopic effects in the scattering of 6,7,8Li projectiles from a 9Be target 6、7、8锂弹丸从9Be靶上散射时的破碎和同位素效应

IF 2.5 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A

Pub Date : 2025-09-27 DOI: 10.1016/j.nuclphysa.2025.123252

D.S. Valiolda , D.M. Janseitov , K. Mendibayev , A. Azhibekov , G. Saidullaeva , Nuha Mutairi , B. Alshahrani , Sh. Hamada , Awad A. Ibraheem

We reanalyze elastic angular distributions (ADs) for ^6,7,8Li + ⁹Be scattering in the 11–30 MeV energy range using semi-microscopic potentials. This study examines how weakly bound (WB) projectiles affect elastic scattering, focusing on breakup effects and isotopic dependencies. Through systematic tests of double-folding potentials (SPP, BDM3Y1, CDM3Y1, and CDM3Y6), we identify distinct behaviors: ⁶Li shows enhanced breakup due to its low binding energy (1.47 MeV), whereas ⁸Li’s neutron-halo structure promotes transfer channels. The persistent imaginary potential near the Coulomb barrier confirms the breakup threshold anomaly (BTA). These results improve our understanding of nuclear reaction dynamics and have implications for astrophysical processes involving light nuclei.

我们利用半微观势重新分析了11-30 MeV范围内6,7,8 li + 9Be散射的弹性角分布（ADs）。本研究探讨了弱束缚（WB）弹丸如何影响弹性散射，重点是破裂效应和同位素依赖性。通过对双折叠电位（SPP, BDM3Y1， CDM3Y1和CDM3Y6）的系统测试，我们发现了不同的行为：6Li由于其低结合能（1.47 MeV）而表现出增强的分裂，而8Li的中子晕结构促进了转移通道。在库仑势垒附近持续存在的假想电位证实了破裂阈值异常（BTA）。这些结果提高了我们对核反应动力学的理解，并对涉及轻核的天体物理过程具有启示意义。

引用次数: 0

Low-j rotational bands in 127Xe 127Xe的低j旋转带

IF 2.5 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A

Pub Date : 2025-09-25 DOI: 10.1016/j.nuclphysa.2025.123251

S. Chakraborty , S. Bhattacharyya , S.S. Nayak , Soumik Bhattacharya , G. Mukherjee , Snigdha Pal , S. Panwar , Suchorita Paul , S. Jehangir , G.H. Bhat , J.A. Sheikh , C. Majumder , A. Sharma , Pankaj K. Giri , R. Raut , S.S. Ghugre

Low-lying one-quasineutron bands, primarily associated with the low-j

ν s_{1 / 2}

and

ν d_{3 / 2}

quasiparticle configurations, have been investigated by means of in-beam

γ

-ray spectroscopy. Excited states were populated through the bombardment of a ²H beam with an energy of 15 MeV on an elemental ¹²⁷I target. This study confirms the previously identified, feebly populated unfavoured signature partner of the

ν d_{3 / 2}

band, and provides firm spin and parity assignments for two low-lying states within this band. Theoretical calculations using the Triaxial Projected Shell Model reproduce the experimental observations well.

用束内γ射线能谱法研究了主要与低j νs1/2和νd3/2准粒子构型有关的低洼单准中子带。激发态是通过能量为15 MeV的2H光束轰击元素127I目标而填充的。这项研究证实了先前确定的、人口稀少的不受欢迎的νd3/2波段的特征伙伴，并为该波段内的两个低洼状态提供了确定的自旋和宇称分配。利用三轴投影壳模型进行的理论计算较好地再现了实验观测结果。

{"title":"Low-j rotational bands in 127Xe","authors":"S. Chakraborty , S. Bhattacharyya , S.S. Nayak , Soumik Bhattacharya , G. Mukherjee , Snigdha Pal , S. Panwar , Suchorita Paul , S. Jehangir , G.H. Bhat , J.A. Sheikh , C. Majumder , A. Sharma , Pankaj K. Giri , R. Raut , S.S. Ghugre","doi":"10.1016/j.nuclphysa.2025.123251","DOIUrl":"10.1016/j.nuclphysa.2025.123251","url":null,"abstract":"<div><div>Low-lying one-quasineutron bands, primarily associated with the low-j <math><mrow><mi>ν</mi><msub><mi>s</mi><mrow><mn>1</mn><mo>/</mo><mn>2</mn></mrow></msub></mrow></math> and <math><mrow><mi>ν</mi><msub><mi>d</mi><mrow><mn>3</mn><mo>/</mo><mn>2</mn></mrow></msub></mrow></math> quasiparticle configurations, have been investigated by means of in-beam <math><mi>γ</mi></math>-ray spectroscopy. Excited states were populated through the bombardment of a 2H beam with an energy of 15 MeV on an elemental 127I target. This study confirms the previously identified, feebly populated unfavoured signature partner of the <math><mrow><mi>ν</mi><msub><mi>d</mi><mrow><mn>3</mn><mo>/</mo><mn>2</mn></mrow></msub></mrow></math> band, and provides firm spin and parity assignments for two low-lying states within this band. Theoretical calculations using the Triaxial Projected Shell Model reproduce the experimental observations well.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1065 ","pages":"Article 123251"},"PeriodicalIF":2.5,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145270254","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Symmetry energy and its correlations with the nuclear structure properties of Z=40 isotopic series at finite temperature 有限温度下Z=40同位素系的对称能及其与核结构性质的关系

IF 2.5 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A

Pub Date : 2025-09-21 DOI: 10.1016/j.nuclphysa.2025.123250

Abdullah Modabbir , Abdul Quddus , Shakeb Ahmad

Symmetry energy is an important quantity in studying the nuclear structure, dynamics of heavy-ion reactions, and physics of neutron stars. The equation of state of asymmetric nuclear matter is limited due to the undetermined symmetry energy and lack of initial constraints on the nuclear matter (NM), leading to a study of the symmetry energy of NM. In this work, we have studied the temperature-dependent nuclear symmetry energy (S) of Zr isotopic series with N=34-86 along with its volume (

S_{V}

) and surface components (

S_{S}

) using the Coherent Density Fluctuation Model (CDFM). The nuclear densities used as input to CDFM are calculated along with the bulk properties at finite temperature within the temperature-dependent Relativistic Mean Field Model using NL3 and IOPB-I interactions. The ground state bulk properties are in good concurrence with the available experimental data. The binding energy per nucleon and neutron pairing energy decrease, and the radial density distribution increases with a rise in temperature (T). The deformed nuclei with an increase in T become spherical at and beyond the critical temperature. The bulk properties exhibit the magicity of N=40 along with the standard neutron magic numbers in this range at T=0 MeV. The nuclear symmetry energy, its surface and volume components, and their ratios

κ

show a similar behavior change as that occurring in the nature of deformation with the neutron number N. As IOPB-I interaction predicts a softer equation of state than NL3 (stiffer), the symmetry energy of the nuclei corresponding to IOPB-I is comparatively less. The symmetry energy of Zr isotopic series is found to be correlated with nuclear structure properties at finite temperature. The symmetry energy is maximum at N=50, even at finite temperature, as this isotope possesses the highest stability in the Zr series. This study will help in the production of exotic nuclei and the understanding of heavy-ion reactions.

对称能是研究核结构、重离子反应动力学和中子星物理的一个重要量。由于对称能的不确定和对核物质缺乏初始约束，使得非对称核物质的状态方程受到限制，从而对核物质的对称能进行了研究。本文利用相干密度涨落模型（CDFM）研究了N=34-86的Zr同位素系列的核对称能(S)、体积（SV）和表面组分（SS）随温度的变化规律。利用NL3和IOPB-I相互作用，在温度依赖的相对论平均场模型中计算了作为CDFM输入的核密度以及有限温度下的体性质。基态体积特性与现有实验数据吻合较好。随着温度(T)的升高，每核子的结合能和中子的配对能减小，径向密度分布增大。随着T的增加，变形核在临界温度及以上变成球形。在T=0 MeV时，体性质表现出N=40的神奇性以及该范围内的标准中子神奇数。核对称能、其表面和体积分量及其比值κ表现出与中子数n的变形性质相似的行为变化。由于IOPB-I相互作用预测的状态方程比NL3更软（更硬），因此与IOPB-I相对应的核对称能相对较少。发现Zr同位素系的对称能与有限温度下的核结构性质相关。对称能在N=50时最大，即使在有限温度下也是如此，因为该同位素在Zr系列中具有最高的稳定性。这项研究将有助于外来核的产生和对重离子反应的理解。

{"title":"Symmetry energy and its correlations with the nuclear structure properties of Z=40 isotopic series at finite temperature","authors":"Abdullah Modabbir , Abdul Quddus , Shakeb Ahmad","doi":"10.1016/j.nuclphysa.2025.123250","DOIUrl":"10.1016/j.nuclphysa.2025.123250","url":null,"abstract":"<div><div>Symmetry energy is an important quantity in studying the nuclear structure, dynamics of heavy-ion reactions, and physics of neutron stars. The equation of state of asymmetric nuclear matter is limited due to the undetermined symmetry energy and lack of initial constraints on the nuclear matter (NM), leading to a study of the symmetry energy of NM. In this work, we have studied the temperature-dependent nuclear symmetry energy (S) of Zr isotopic series with N=34-86 along with its volume (<math><msub><mi>S</mi><mi>V</mi></msub></math>) and surface components (<math><msub><mi>S</mi><mi>S</mi></msub></math>) using the Coherent Density Fluctuation Model (CDFM). The nuclear densities used as input to CDFM are calculated along with the bulk properties at finite temperature within the temperature-dependent Relativistic Mean Field Model using NL3 and IOPB-I interactions. The ground state bulk properties are in good concurrence with the available experimental data. The binding energy per nucleon and neutron pairing energy decrease, and the radial density distribution increases with a rise in temperature (T). The deformed nuclei with an increase in T become spherical at and beyond the critical temperature. The bulk properties exhibit the magicity of N=40 along with the standard neutron magic numbers in this range at T=0 MeV. The nuclear symmetry energy, its surface and volume components, and their ratios <math><mi>κ</mi></math> show a similar behavior change as that occurring in the nature of deformation with the neutron number N. As IOPB-I interaction predicts a softer equation of state than NL3 (stiffer), the symmetry energy of the nuclei corresponding to IOPB-I is comparatively less. The symmetry energy of Zr isotopic series is found to be correlated with nuclear structure properties at finite temperature. The symmetry energy is maximum at N=50, even at finite temperature, as this isotope possesses the highest stability in the Zr series. This study will help in the production of exotic nuclei and the understanding of heavy-ion reactions.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1065 ","pages":"Article 123250"},"PeriodicalIF":2.5,"publicationDate":"2025-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145157499","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Theoretical predictions of the decay rate change of the 40K nucleus 40K核衰变速率变化的理论预测

IF 2.5 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A

Pub Date : 2025-09-19 DOI: 10.1016/j.nuclphysa.2025.123244

Farshid Gholamian, Mohammad Mehdi Firoozabadi

This study employs first-principles density functional theory (DFT) calculations to investigate the influence of chemical environment and pressure on the electron capture (EC) decay rate of the

^{40} K

nucleus in different chemical environments: metallic potassium (K), potassium chloride (KCl), and muscovite mica (

{KAl}_{2} ({AlSi}_{3}) O_{10} {(OH)}_{2}

). Our results indicate a 0.17 % reduction in the EC decay rate, corresponding to a 0.17 % increase in the

^{40} K

half-life within the muscovite structure compared to metallic potassium. Additionally, pressure effects on the

^{40} K

half-life are investigated for metallic potassium and muscovite structures. Results show a 0.011 % increase in

^{40} K

EC decay rate at 25 GPa relative to zero pressure in metallic potassium.

本研究采用第一性原理密度泛函理论（DFT）计算，研究了不同化学环境：金属钾(K)、氯化钾（KCl）和白云母(KAl2（AlSi3)O10(OH)2）下，化学环境和压力对40K原子核电子俘获（EC）衰变速率的影响。我们的研究结果表明，与金属钾相比，EC衰变率降低了0.17%，对应于白云母结构内40K半衰期增加了0.17%。此外，还研究了压力对金属钾和白云母结构的40K半衰期的影响。结果表明，相对于零压力，在25 GPa时，40K EC的衰变率提高了0.011%。

{"title":"Theoretical predictions of the decay rate change of the 40K nucleus","authors":"Farshid Gholamian, Mohammad Mehdi Firoozabadi","doi":"10.1016/j.nuclphysa.2025.123244","DOIUrl":"10.1016/j.nuclphysa.2025.123244","url":null,"abstract":"<div><div>This study employs first-principles density functional theory (DFT) calculations to investigate the influence of chemical environment and pressure on the electron capture (EC) decay rate of the <math><mrow><msup><mrow></mrow><mn>40</mn></msup><mrow><mi>K</mi></mrow></mrow></math> nucleus in different chemical environments: metallic potassium (K), potassium chloride (KCl), and muscovite mica (<math><mrow><msub><mrow><mi>KAl</mi></mrow><mn>2</mn></msub><mrow><mo>(</mo><msub><mrow><mi>AlSi</mi></mrow><mn>3</mn></msub><mo>)</mo></mrow><msub><mrow><mi>O</mi></mrow><mn>10</mn></msub><msub><mrow><mo>(</mo><mrow><mi>OH</mi></mrow><mo>)</mo></mrow><mn>2</mn></msub></mrow></math>). Our results indicate a 0.17 % reduction in the EC decay rate, corresponding to a 0.17 % increase in the <math><mrow><msup><mrow></mrow><mn>40</mn></msup><mrow><mi>K</mi></mrow></mrow></math> half-life within the muscovite structure compared to metallic potassium. Additionally, pressure effects on the <math><mrow><msup><mrow></mrow><mn>40</mn></msup><mrow><mi>K</mi></mrow></mrow></math> half-life are investigated for metallic potassium and muscovite structures. Results show a 0.011 % increase in <math><mrow><msup><mrow></mrow><mn>40</mn></msup><mrow><mi>K</mi></mrow></mrow></math> EC decay rate at 25 GPa relative to zero pressure in metallic potassium.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1065 ","pages":"Article 123244"},"PeriodicalIF":2.5,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145364251","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

The surrogate reactions for the neutron-capture rate using OEDO and SHARAQ in RIBF 在RIBF中使用OEDO和SHARAQ替代中子捕获速率的反应

IF 2.5 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A

Pub Date : 2025-09-18 DOI: 10.1016/j.nuclphysa.2025.123248

N. Imai , M. Dozono , S. Bae , S. Michimasa , T. Sumikama , S. Ota , S. Hayakawa , J.W. Hwang , K. Iribe , C. Iwamoto , S. Kawase , K. Kawata , N. Kitamura , S. Masuoka , K. Nakano , P. Schrock , D. Suzuki , R. Tsunoda , K. Wimmer , T. Chillery , S. Shimoura

To determine the neutron capture rates of radioactive nuclei, we have developed an experimental technique using surrogate reactions, specifically the (d, p) reaction in inverse kinematics. The gamma-emission probabilities from unbound states were deduced by identifying the outgoing reaction residues, instead of detecting the de-excitation

γ

rays from the compound states. Such experiments have become feasible through the use of the OEDO device, which enables beam deceleration and focusing, and the SHARAQ spectrometer at RIBF. We applied this technique to measure the neutron capture rates of

^{79}

Se for nuclear transmutation data, and of

^{130}

Sn for studies related to the

r

-process. In this contribution, we discuss the neutron-capture cross sections of

^{79}

Se using the surrogate ratio method, and introduce the updated experimental setup for the

^{130}

Sn measurement.

为了确定放射性原子核的中子俘获率，我们开发了一种使用替代反应的实验技术，特别是逆运动学中的（d, p）反应。通过识别出的反应残基来推导出非束缚态的γ发射概率，而不是检测来自化合物态的去激发γ射线。通过使用能够使光束减速和聚焦的OEDO装置和RIBF的SHARAQ光谱仪，这样的实验变得可行。我们应用该技术测量了79Se的中子俘获率，用于核嬗变数据，以及130Sn的中子俘获率，用于r过程相关的研究。在这篇文章中，我们用替代比值法讨论了79Se的中子捕获截面，并介绍了130Sn测量的最新实验装置。

{"title":"The surrogate reactions for the neutron-capture rate using OEDO and SHARAQ in RIBF","authors":"N. Imai , M. Dozono , S. Bae , S. Michimasa , T. Sumikama , S. Ota , S. Hayakawa , J.W. Hwang , K. Iribe , C. Iwamoto , S. Kawase , K. Kawata , N. Kitamura , S. Masuoka , K. Nakano , P. Schrock , D. Suzuki , R. Tsunoda , K. Wimmer , T. Chillery , S. Shimoura","doi":"10.1016/j.nuclphysa.2025.123248","DOIUrl":"10.1016/j.nuclphysa.2025.123248","url":null,"abstract":"<div><div>To determine the neutron capture rates of radioactive nuclei, we have developed an experimental technique using surrogate reactions, specifically the (d, p) reaction in inverse kinematics. The gamma-emission probabilities from unbound states were deduced by identifying the outgoing reaction residues, instead of detecting the de-excitation <math><mi>γ</mi></math> rays from the compound states. Such experiments have become feasible through the use of the OEDO device, which enables beam deceleration and focusing, and the SHARAQ spectrometer at RIBF. We applied this technique to measure the neutron capture rates of <math><msup><mrow></mrow><mn>79</mn></msup></math>Se for nuclear transmutation data, and of <math><msup><mrow></mrow><mn>130</mn></msup></math>Sn for studies related to the <math><mi>r</mi></math>-process. In this contribution, we discuss the neutron-capture cross sections of <math><msup><mrow></mrow><mn>79</mn></msup></math>Se using the surrogate ratio method, and introduce the updated experimental setup for the <math><msup><mrow></mrow><mn>130</mn></msup></math>Sn measurement.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1064 ","pages":"Article 123248"},"PeriodicalIF":2.5,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145154625","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Advanced study of chiral symmetry in pionic atoms 电子原子手性对称性的进一步研究

IF 2.5 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A

Pub Date : 2025-09-12 DOI: 10.1016/j.nuclphysa.2025.123246

Kenta Itahashi , Takahiro Nishi , Yoshiki K. Tanaka

Precision spectroscopy of pionic atoms sets constraints to the pion-nucleus interaction and to the vacuum expectation value of the quark condensate

〈 \bar{q} q 〉

in the nuclear medium. We deduce

〈 \bar{q} q 〉

to be reduced to

77 \pm 2

% at the density of about 58 % of the nuclear saturation density compared to that in the vacuum. For further study, we aim to achieve the density dependence of the quark condensate by improving the experimental precision. We develop a new method of inverse-kinematics reaction for the spectroscopy, which may lead to future study of pionic unstable nuclei.

电子原子的精密光谱学对核介质中介子-核相互作用和夸克凝聚< q¯q >的真空期望值有一定的限制。我们推断< q¯q >在约为真空中核饱和密度的58%的密度下降低到77±2%。为了进一步的研究，我们的目标是通过提高实验精度来实现夸克凝聚的密度依赖。本文提出了一种新的反运动学反应光谱方法，为电子不稳定核的进一步研究奠定了基础。

引用次数: 0

Compound and non-compound nuclear fusion using forward recoil range distributions of evaporation residues produced in 18O+154Sm system 利用18O+154Sm体系中蒸发残留物的前反冲范围分布进行复合和非复合核聚变

IF 2.5 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A

Pub Date : 2025-09-11 DOI: 10.1016/j.nuclphysa.2025.123245

Rajesh K. Sahoo , Dharmendra Singh , Amritraj Mahato , Pankaj K. Giri , Nitin Sharma , Lupteindu Chhura , Rahul Mahato , Sneha B. Linda , Harish Kumar , Suhail A. Tali , Rahbar Ali , M. Afzal Ansari , R. Kumar , S. Muralithar , R.P. Singh

The study investigates partial linear momentum transfer in the non-compound nuclear fusion (NCNF) process by analyzing the forward recoil range distributions (FRRDs) of evaporation residues (ERs) produced in the

^{18}

O+

^{154}

Sm system at projectile energy

\approx

5.27 MeV/nucleon. The ERs formed through xn and pxn evaporation channels exhibit single-peaked gaussian distributions in forward recoil ranges while their range-integrated cross sections alines well with theoretical prediction of PACE-4 code. These results show the signature of complete momentum transfer and formation of a compound nucleus

^{172}

Yb*. However, ERs produced via

α

spectator channels shows single peaked gaussian distribution in forward recoil ranges but with a shorter mean ranges and larger cross sections than theoretical predictions. This result suggests that partial momentum transfer results from the breakup of

^{18}

O into

^{14}

C+

α

, contributing to the formation of an intermediate

^{168}

Er* composite system. To investigate isotopic effects on NCNF dynamics, reactions induced by

^{16}

O and

^{18}

O projectiles were compared within the framework of Z

_{P}

Z

_{T}

and total asymmetry (

μ_{c m}^{T}

). At energies

\approx

10

%

above the coulomb barrier, both projectiles exhibit comparable NCNF contributions. However, at projectile energies

\geq

30

%

above the Coulomb barrier,

^{18}

O exhibits a significantly higher NCNF contribution as compare to

^{16}

O. Further, the critical angular momentum increases exponentially with both Z

_{P}

Z

_{T}

and

μ_{c m}^{T}

, establishing these parameters as key factors in onset of the NCNF process. Additionally, the study finds also that fusion suppression depends on projectile’s

α

-separation energy. A generalized expressio

通过分析18O+154Sm体系在抛射能量≈5.27 MeV/核子时产生的蒸发残留物（ERs）的正向后坐力范围分布（FRRDs），研究了非复合核聚变（NCNF）过程中的部分线性动量传递。通过xn和pxn蒸发通道形成的电阻抗在前反冲范围内呈单峰高斯分布，其距离积分截面与PACE-4代码的理论预测吻合较好。这些结果显示了完全动量转移和形成复合原子核172Yb*的特征。然而，通过α观众通道产生的电阻抗在前反冲范围内呈现单峰高斯分布，但平均范围较短，截面比理论预测大。这一结果表明，18O分裂成14C+α导致了部分动量转移，导致了中间168Er*复合体系的形成。为了研究同位素对NCNF动力学的影响，在ZPZT和总不对称（μcmT）的框架下，比较了16O和18O弹丸引起的反应。在库仑势垒以上≈10%的能量处，两种射体表现出相当的非cnf贡献。然而，在库仑势垒以上能量≥30%时，18O表现出明显高于16O的NCNF贡献。此外，临界角动量随ZPZT和μcmT的增加而呈指数增长，这表明这些参数是NCNF过程开始的关键因素。此外，研究还发现，熔合抑制取决于弹丸的α-分离能。提出了一个广义表达式来估计涉及154Sm上弱束缚和强束缚弹丸的反应的NCNF贡献。

{"title":"Compound and non-compound nuclear fusion using forward recoil range distributions of evaporation residues produced in 18O+154Sm system","authors":"Rajesh K. Sahoo , Dharmendra Singh , Amritraj Mahato , Pankaj K. Giri , Nitin Sharma , Lupteindu Chhura , Rahul Mahato , Sneha B. Linda , Harish Kumar , Suhail A. Tali , Rahbar Ali , M. Afzal Ansari , R. Kumar , S. Muralithar , R.P. Singh","doi":"10.1016/j.nuclphysa.2025.123245","DOIUrl":"10.1016/j.nuclphysa.2025.123245","url":null,"abstract":"<div><div>The study investigates partial linear momentum transfer in the non-compound nuclear fusion (NCNF) process by analyzing the forward recoil range distributions (FRRDs) of evaporation residues (ERs) produced in the <math><msup><mrow></mrow><mn>18</mn></msup></math>O+<math><msup><mrow></mrow><mn>154</mn></msup></math>Sm system at projectile energy <math><mo>≈</mo></math> 5.27 MeV/nucleon. The ERs formed through xn and pxn evaporation channels exhibit single-peaked gaussian distributions in forward recoil ranges while their range-integrated cross sections alines well with theoretical prediction of PACE-4 code. These results show the signature of complete momentum transfer and formation of a compound nucleus <math><msup><mrow></mrow><mn>172</mn></msup></math>Yb*. However, ERs produced via <math><mi>α</mi></math> spectator channels shows single peaked gaussian distribution in forward recoil ranges but with a shorter mean ranges and larger cross sections than theoretical predictions. This result suggests that partial momentum transfer results from the breakup of <math><msup><mrow></mrow><mn>18</mn></msup></math>O into <math><msup><mrow></mrow><mn>14</mn></msup></math>C+<math><mi>α</mi></math>, contributing to the formation of an intermediate <math><msup><mrow></mrow><mn>168</mn></msup></math>Er* composite system. To investigate isotopic effects on NCNF dynamics, reactions induced by <math><msup><mrow></mrow><mn>16</mn></msup></math>O and <math><msup><mrow></mrow><mn>18</mn></msup></math>O projectiles were compared within the framework of Z<math><msub><mrow></mrow><mi>P</mi></msub></math>Z<math><msub><mrow></mrow><mi>T</mi></msub></math> and total asymmetry (<math><msubsup><mi>μ</mi><mrow><mi>c</mi><mi>m</mi></mrow><mi>T</mi></msubsup></math>). At energies <math><mo>≈</mo></math> 10<math><mo>%</mo></math> above the coulomb barrier, both projectiles exhibit comparable NCNF contributions. However, at projectile energies <math><mo>≥</mo></math> 30<math><mo>%</mo></math> above the Coulomb barrier, <math><msup><mrow></mrow><mn>18</mn></msup></math>O exhibits a significantly higher NCNF contribution as compare to <math><msup><mrow></mrow><mn>16</mn></msup></math>O. Further, the critical angular momentum increases exponentially with both Z<math><msub><mrow></mrow><mi>P</mi></msub></math>Z<math><msub><mrow></mrow><mi>T</mi></msub></math> and <math><msubsup><mi>μ</mi><mrow><mi>c</mi><mi>m</mi></mrow><mi>T</mi></msubsup></math>, establishing these parameters as key factors in onset of the NCNF process. Additionally, the study finds also that fusion suppression depends on projectile’s <math><mi>α</mi></math>-separation energy. A generalized expressio","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1064 ","pages":"Article 123245"},"PeriodicalIF":2.5,"publicationDate":"2025-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145219896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Beta decay properties of neutron-rich Co, Ni, Cu and Zn isotopes 富中子Co、Ni、Cu和Zn同位素的β衰变特性

IF 2.5 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A

Pub Date : 2025-09-09 DOI: 10.1016/j.nuclphysa.2025.123237

Jameel-Un Nabi , Asim Ullah , Mureed Abbas Qammar

Accurate and reliable assessments of the β-decay characteristics of neutron-rich nuclei are essential for gaining a deeper insight into the supernova explosions and related nucleosynthesis processes, including the r-process. We calculated the β-decay half-lives, Gamow-Teller distributions and branching ratios of neutron-rich cobalt, nickel and copper isotopes. Stellar weak interaction rates for a total of thirty-six neutron-rich nuclei (⁷²⁻⁷⁹Co, ⁷⁴⁻⁸³Ni, ⁷⁸⁻⁸⁶Cu and ⁸⁰⁻⁸⁸Zn) were calculated using the proton-neutron quasi-particle random phase approximation (pn-QRPA) model. The computed half-lives are in better agreement with the measured data (having mean deviation of

\bar{r}

= 1.45) as compared to previous results. The stellar β-decay rates are bigger than the independent particle model rates at low temperature and density values. For high-temperature and high-density zones, the previous rates are up to an order of magnitude bigger than our results. The findings of the current investigation may prove useful for simulation of post-silicon burning evolution of stars and nucleosynthesis calculations.

准确可靠地评估富中子核的β衰变特征对于深入了解超新星爆炸和相关的核合成过程（包括r过程）至关重要。我们计算了富中子钴、镍和铜同位素的β衰变半衰期、Gamow-Teller分布和分支比。采用质子-中子准粒子随机相近似（pn-QRPA）模型计算了36个富中子核（72−79Co, 74−83Ni， 78−86Cu和80−88Zn）的恒星弱相互作用率。与以前的结果相比，计算的半衰期与测量数据（平均偏差r¯= 1.45）更加吻合。在较低的温度和密度值下，恒星β-衰变速率大于独立粒子模型速率。对于高温和高密度区域，以前的速率比我们的结果大一个数量级。目前的研究结果可能对硅燃烧后恒星演化的模拟和核合成计算有用。

{"title":"Beta decay properties of neutron-rich Co, Ni, Cu and Zn isotopes","authors":"Jameel-Un Nabi , Asim Ullah , Mureed Abbas Qammar","doi":"10.1016/j.nuclphysa.2025.123237","DOIUrl":"10.1016/j.nuclphysa.2025.123237","url":null,"abstract":"<div><div>Accurate and reliable assessments of the β-decay characteristics of neutron-rich nuclei are essential for gaining a deeper insight into the supernova explosions and related nucleosynthesis processes, including the r-process. We calculated the β-decay half-lives, Gamow-Teller distributions and branching ratios of neutron-rich cobalt, nickel and copper isotopes. Stellar weak interaction rates for a total of thirty-six neutron-rich nuclei (72−79Co, 74−83Ni, 78−86Cu and 80−88Zn) were calculated using the proton-neutron quasi-particle random phase approximation (pn-QRPA) model. The computed half-lives are in better agreement with the measured data (having mean deviation of <math><mover><mrow><mi>r</mi></mrow><mrow><mo>¯</mo></mrow></mover></math> = 1.45) as compared to previous results. The stellar β-decay rates are bigger than the independent particle model rates at low temperature and density values. For high-temperature and high-density zones, the previous rates are up to an order of magnitude bigger than our results. The findings of the current investigation may prove useful for simulation of post-silicon burning evolution of stars and nucleosynthesis calculations.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1064 ","pages":"Article 123237"},"PeriodicalIF":2.5,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145045440","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

首页上一页

2
3
4
5
6
7
8
9
...
10

下一页尾页

类型

全部化学•材料生命科学医学物理工程技术环境•农林材料科学地球科学法学管理学化学环境科学与生态学计算机科学教育学经济学农林科学人文科学生物学数学物理与天体物理心理学综合性期刊其他工业工程理学历史学农学文学信息工程

数据库

全部 ACS Publications Elsevier ieeexplore Springer The Royal Society of Chemistry Wiley

期刊

Nuclear Physics A

全部 Acc. Chem. Res. ACS Applied Bio Materials ACS Appl. Electron. Mater. ACS Appl. Energy Mater. ACS Appl. Mater. Interfaces ACS Appl. Nano Mater. ACS Appl. Polym. Mater. ACS BIOMATER-SCI ENG ACS Catal. ACS Cent. Sci. ACS Chem. Biol. ACS Chemical Health & Safety ACS Chem. Neurosci. ACS Comb. Sci. ACS Earth Space Chem. ACS Energy Lett. ACS Infect. Dis. ACS Macro Lett. ACS Mater. Lett. ACS Med. Chem. Lett. ACS Nano ACS Omega ACS Photonics ACS Sens. ACS Sustainable Chem. Eng. ACS Synth. Biol. Anal. Chem. BIOCHEMISTRY-US Bioconjugate Chem. BIOMACROMOLECULES Chem. Res. Toxicol. Chem. Rev. Chem. Mater. CRYST GROWTH DES ENERG FUEL Environ. Sci. Technol. Environ. Sci. Technol. Lett. Eur. J. Inorg. Chem. IND ENG CHEM RES Inorg. Chem. J. Agric. Food. Chem. J. Chem. Eng. Data J. Chem. Educ. J. Chem. Inf. Model. J. Chem. Theory Comput. J. Med. Chem. J. Nat. Prod. J PROTEOME RES J. Am. Chem. Soc. LANGMUIR MACROMOLECULES Mol. Pharmaceutics Nano Lett. Org. Lett. ORG PROCESS RES DEV ORGANOMETALLICS J. Org. Chem. J. Phys. Chem. J. Phys. Chem. A J. Phys. Chem. B J. Phys. Chem. C J. Phys. Chem. Lett. Analyst Anal. Methods Biomater. Sci. Catal. Sci. Technol. Chem. Commun. Chem. Soc. Rev. CHEM EDUC RES PRACT CRYSTENGCOMM Dalton Trans. Energy Environ. Sci. ENVIRON SCI-NANO ENVIRON SCI-PROC IMP ENVIRON SCI-WAT RES Faraday Discuss. Food Funct. Green Chem. Inorg. Chem. Front. Integr. Biol. J. Anal. At. Spectrom. J. Mater. Chem. A J. Mater. Chem. B J. Mater. Chem. C Lab Chip Mater. Chem. Front. Mater. Horiz. MEDCHEMCOMM Metallomics Mol. Biosyst. Mol. Syst. Des. Eng. Nanoscale Nanoscale Horiz. Nat. Prod. Rep. New J. Chem. Org. Biomol. Chem. Org. Chem. Front. PHOTOCH PHOTOBIO SCI PCCP Polym. Chem.

﹀