Pub Date : 2024-09-19DOI: 10.1103/physrevc.110.034909
Hai-Cheng Wang, Song-Jie Li, Lu-Meng Liu, Jun Xu, Zhong-Zhou Ren
We have investigated the performance of anisotropic flows <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mo>〈</mo><msubsup><mi>v</mi><mi>n</mi><mn>2</mn></msubsup><mo>〉</mo></mrow></math>, transverse momentum fluctuations <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mo>〈</mo><mi>δ</mi><msubsup><mi>p</mi><mi>T</mi><mn>2</mn></msubsup><mo>〉</mo></mrow></math>, and their correlations <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mo>〈</mo><msubsup><mi>v</mi><mi>n</mi><mn>2</mn></msubsup><mi>δ</mi><msub><mi>p</mi><mi>T</mi></msub><mo>〉</mo></mrow></math> in central collisions at relativistic energies as probes of deformation parameters <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>β</mi><mi>n</mi></msub></math> of colliding nuclei, if these nuclei are light nuclei with large <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>β</mi><mi>n</mi></msub></math> and different configurations of <math xmlns="http://www.w3.org/1998/Math/MathML"><mi>α</mi></math> clusters. The effects from higher-order <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>β</mi><mi>n</mi></msub></math> terms are illustrated by derived relations based on the overlap of two nuclei with uniform density distributions and by dynamic simulations of collisions of heavy nuclei whose density distributions are of a deformed Woods-Saxon (WS) form. While the linear relations between <math xmlns="http://www.w3.org/1998/Math/MathML"><msubsup><mi>β</mi><mi>n</mi><mn>2</mn></msubsup><mo>,</mo><mo> </mo><mrow><mo>〈</mo><msubsup><mi>v</mi><mi>n</mi><mn>2</mn></msubsup><mo>〉</mo></mrow></math>, and <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mo>〈</mo><mi>δ</mi><msubsup><mi>p</mi><mi>T</mi><mn>2</mn></msubsup><mo>〉</mo></mrow></math> and that between <math xmlns="http://www.w3.org/1998/Math/MathML"><msubsup><mi>β</mi><mi>n</mi><mn>3</mn></msubsup></math> and <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mo>〈</mo><msubsup><mi>v</mi><mi>n</mi><mn>2</mn></msubsup><mi>δ</mi><msub><mi>p</mi><mi>T</mi></msub><mo>〉</mo></mrow></math> can be violated for extremely large <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>β</mi><mi>n</mi></msub></math>, they are mostly valid for realistic values of <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>β</mi><mi>n</mi></msub></math>, as long as the density distribution of colliding nuclei can be described by a deformed WS form. However, these linear relations are generally not valid with more realistic density distributions of light nuclei with <math xmlns="http://www.w3.org/1998/Math/MathML"><mi>α</mi></math> clusters, and the amount of deviation depends on the detailed <math xmlns="http://www.w3.org/1998/Math/MathML"><mi>α</mi></math>-cluster configurations. Care must be taken when one tries to extract the deformation of light nuclei, and specific probes for <math xmlns="http://www.w3.org/1998/Math/MathML"><mi>α</mi></math>-cluster structures in these nuclei are very
{"title":"Deformation probes for light nuclei in their collisions at relativistic energies","authors":"Hai-Cheng Wang, Song-Jie Li, Lu-Meng Liu, Jun Xu, Zhong-Zhou Ren","doi":"10.1103/physrevc.110.034909","DOIUrl":"https://doi.org/10.1103/physrevc.110.034909","url":null,"abstract":"We have investigated the performance of anisotropic flows <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mo>〈</mo><msubsup><mi>v</mi><mi>n</mi><mn>2</mn></msubsup><mo>〉</mo></mrow></math>, transverse momentum fluctuations <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mo>〈</mo><mi>δ</mi><msubsup><mi>p</mi><mi>T</mi><mn>2</mn></msubsup><mo>〉</mo></mrow></math>, and their correlations <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mo>〈</mo><msubsup><mi>v</mi><mi>n</mi><mn>2</mn></msubsup><mi>δ</mi><msub><mi>p</mi><mi>T</mi></msub><mo>〉</mo></mrow></math> in central collisions at relativistic energies as probes of deformation parameters <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>β</mi><mi>n</mi></msub></math> of colliding nuclei, if these nuclei are light nuclei with large <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>β</mi><mi>n</mi></msub></math> and different configurations of <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>α</mi></math> clusters. The effects from higher-order <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>β</mi><mi>n</mi></msub></math> terms are illustrated by derived relations based on the overlap of two nuclei with uniform density distributions and by dynamic simulations of collisions of heavy nuclei whose density distributions are of a deformed Woods-Saxon (WS) form. While the linear relations between <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msubsup><mi>β</mi><mi>n</mi><mn>2</mn></msubsup><mo>,</mo><mo> </mo><mrow><mo>〈</mo><msubsup><mi>v</mi><mi>n</mi><mn>2</mn></msubsup><mo>〉</mo></mrow></math>, and <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mo>〈</mo><mi>δ</mi><msubsup><mi>p</mi><mi>T</mi><mn>2</mn></msubsup><mo>〉</mo></mrow></math> and that between <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msubsup><mi>β</mi><mi>n</mi><mn>3</mn></msubsup></math> and <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mo>〈</mo><msubsup><mi>v</mi><mi>n</mi><mn>2</mn></msubsup><mi>δ</mi><msub><mi>p</mi><mi>T</mi></msub><mo>〉</mo></mrow></math> can be violated for extremely large <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>β</mi><mi>n</mi></msub></math>, they are mostly valid for realistic values of <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>β</mi><mi>n</mi></msub></math>, as long as the density distribution of colliding nuclei can be described by a deformed WS form. However, these linear relations are generally not valid with more realistic density distributions of light nuclei with <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>α</mi></math> clusters, and the amount of deviation depends on the detailed <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>α</mi></math>-cluster configurations. Care must be taken when one tries to extract the deformation of light nuclei, and specific probes for <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>α</mi></math>-cluster structures in these nuclei are very ","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142256105","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}
Pub Date : 2024-09-19DOI: 10.1103/physrevc.110.034614
N. Thomson, L. Moschini, A. Diaz-Torres
Deuterium-tritium (D-T) fusion is a key to generating safe, clean, and limitless energy on Earth in future fusion power plants. Its understanding at low collision energies is incomplete, as D-T fusion is a quantum tunneling process affected by resonances whose origin is linked to properties of not fully understood nuclear forces. Simplified quantum dynamical calculations of laser-assisted D-T fusion are presented, suggesting that laser-nucleus interaction can enhance the average D-T fusion probability by 7– at deep subbarrier energies using laser fields of intensity – and a photon energy of 1 eV.
{"title":"Laser-assisted deuterium-tritium fusion: A quantum dynamical model","authors":"N. Thomson, L. Moschini, A. Diaz-Torres","doi":"10.1103/physrevc.110.034614","DOIUrl":"https://doi.org/10.1103/physrevc.110.034614","url":null,"abstract":"Deuterium-tritium (D-T) fusion is a key to generating safe, clean, and limitless energy on Earth in future fusion power plants. Its understanding at low collision energies is incomplete, as D-T fusion is a quantum tunneling process affected by resonances whose origin is linked to properties of not fully understood nuclear forces. Simplified quantum dynamical calculations of laser-assisted D-T fusion are presented, suggesting that laser-nucleus interaction can enhance the average D-T fusion probability by 7–<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mn>70</mn><mo>%</mo></mrow></math> at deep subbarrier energies using laser fields of intensity <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mn>10</mn><mn>27</mn></msup></math>–<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msup><mn>10</mn><mn>29</mn></msup><mo> </mo><msup><mrow><mi mathvariant=\"normal\">W</mi><mspace width=\"4pt\"></mspace><mi>cm</mi></mrow><mrow><mo>−</mo><mn>2</mn></mrow></msup></math> and a photon energy of 1 eV.","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142256103","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}
Pub Date : 2024-09-18DOI: 10.1103/physrevc.110.034908
Olga Soloveva, Andrea Palermo, Elena Bratkovskaya
We use deep neural networks (DNNs) to obtain the properties of partons in terms of an off-shell quasiparticle description. We aim to infer masses and widths of quasigluons, up/down, and strange (anti)quarks using constraints on the macroscopic thermodynamic observables obtained by the first-principles lattice QCD (lQCD) calculations. In this study we use three independent dimensionless thermodynamic observables from lQCD for minimization as the ratio of entropy density to temperature , baryon susceptibility , and strangeness susceptibility . First, we train our DNN using the DQPM (dynamical quasiparticle model) ansatz for the masses and widths. Furthermore, we use the DNN capabilities to generalize this ansatz, to evaluate which quasiparticle masses and widths are desirable to describe different thermodynamic functions simultaneously. To evaluate consistently the microscopic properties obtained by the DNN in the case of off-shell quarks and gluons, we compute transport coefficients using the spectral function within the Kubo-Zubarev formalism in different setups. In particular, we make a comprehensive comparison in the case of the dimensionless ratios of shear viscosity over entropy density , and electric conductivity over temperature , which provide additional constraints for the parameter generalization of the considered model cases. We present the parameter settings found by the DNN which can improve the quasiparticle description of lQCD data on the susceptibility and electric conductivity of strange quarks.
{"title":"Extraction of the microscopic properties of quasiparticles using deep neural networks","authors":"Olga Soloveva, Andrea Palermo, Elena Bratkovskaya","doi":"10.1103/physrevc.110.034908","DOIUrl":"https://doi.org/10.1103/physrevc.110.034908","url":null,"abstract":"We use deep neural networks (DNNs) to obtain the properties of partons in terms of an off-shell quasiparticle description. We aim to infer masses and widths of quasigluons, up/down, and strange (anti)quarks using constraints on the macroscopic thermodynamic observables obtained by the first-principles lattice QCD (lQCD) calculations. In this study we use three independent dimensionless thermodynamic observables from lQCD for minimization as the ratio of entropy density to temperature <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>s</mi><mo>/</mo><msup><mi>T</mi><mn>3</mn></msup></mrow></math>, baryon susceptibility <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msubsup><mi>χ</mi><mn>2</mn><mi>B</mi></msubsup></math>, and strangeness susceptibility <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msubsup><mi>χ</mi><mn>2</mn><mi>S</mi></msubsup></math>. First, we train our DNN using the DQPM (dynamical quasiparticle model) ansatz for the masses and widths. Furthermore, we use the DNN capabilities to generalize this ansatz, to evaluate which quasiparticle masses and widths are desirable to describe different thermodynamic functions simultaneously. To evaluate consistently the microscopic properties obtained by the DNN in the case of off-shell quarks and gluons, we compute transport coefficients using the spectral function within the Kubo-Zubarev formalism in different setups. In particular, we make a comprehensive comparison in the case of the dimensionless ratios of shear viscosity over entropy density <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>η</mi><mo>/</mo><mi>s</mi></mrow></math>, and electric conductivity over temperature <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><msub><mi>σ</mi><mi>Q</mi></msub><mo>/</mo><mi>T</mi></mrow></math>, which provide additional constraints for the parameter generalization of the considered model cases. We present the parameter settings found by the DNN which can improve the quasiparticle description of lQCD data on the susceptibility and electric conductivity of strange quarks.","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142255819","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}
Pub Date : 2024-09-18DOI: 10.1103/physrevc.110.l032801
K. Stöckelet al.
The reaction, where ‘D’ denotes ‘’, is of primary importance in cosmology and nuclear physics since it offers a unique opportunity to test predictions based on the description of nuclear interactions. We present a novel approach to extract the angular distribution of the photons emitted by the reaction inferred from the shape of the experimental spectra. The measurement was performed in the Gran Sasso Laboratories by the LUNA collaboration. By using a HPGe detector faced to an extended deuterium gas target, it was possible to derive the angular distribution in the 30–280 keV kinetic energy range and to compare the results with recent ab initio predictions.
D(p,γ)He3反应（其中 "D "表示 "H2"）在宇宙学和核物理中至关重要，因为它为检验基于核相互作用描述的预测提供了一个独特的机会。我们提出了一种新方法，从实验γ光谱的形状推断出D(p,γ)He3反应发射的光子的角度分布。测量是由 LUNA 合作小组在格兰萨索实验室进行的。通过使用面对扩展氘气靶的 HPGe 探测器，可以推导出 30-280 keV 动能范围内的角分布，并将结果与最近的 ab initio 预测进行比较。
{"title":"Novel approach to infer the H2(p,γ)He3 angular distribution: Experimental results and comparison with theoretical calculations","authors":"K. Stöckelet al.","doi":"10.1103/physrevc.110.l032801","DOIUrl":"https://doi.org/10.1103/physrevc.110.l032801","url":null,"abstract":"The <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mtext>D</mtext><mo>(</mo><mi>p</mi><mo>,</mo><mi>γ</mi><mo>)</mo><mmultiscripts><mi>He</mi><mprescripts></mprescripts><none></none><mn>3</mn></mmultiscripts></mrow></math> reaction, where ‘D’ denotes ‘<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi mathvariant=\"normal\">H</mi><mprescripts></mprescripts><none></none><mn>2</mn></mmultiscripts></math>’, is of primary importance in cosmology and nuclear physics since it offers a unique opportunity to test predictions based on the description of nuclear interactions. We present a novel approach to extract the angular distribution of the photons emitted by the <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mtext>D</mtext><mo>(</mo><mi>p</mi><mo>,</mo><mi>γ</mi><mo>)</mo><mmultiscripts><mi>He</mi><mprescripts></mprescripts><none></none><mn>3</mn></mmultiscripts></mrow></math> reaction inferred from the shape of the experimental <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>γ</mi></math> spectra. The measurement was performed in the Gran Sasso Laboratories by the LUNA collaboration. By using a HPGe detector faced to an extended deuterium gas target, it was possible to derive the angular distribution in the 30–280 keV kinetic energy range and to compare the results with recent <i>ab initio</i> predictions.","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142255820","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}
Pub Date : 2024-09-18DOI: 10.1103/physrevc.110.034320
M. Ley, J. Jolie, L. Knafla, A. Blazhev, A. Esmaylzadeh, C. Fransen, A. Pfeil, J.-M. Régis, P. Van Isacker
Low-lying excited states in and were populated using the two fusion-evaporation reactions and at the Cologne FN Tandem accelerator and their lifetimes were measured using a hybrid setup of high-purity germanium and fast cerium doped lanthanum bromide detectors for fast-timing. The measured lifetimes fill gaps in the experimental data for electromagnetic transition probabilities along the isotonic chain and provide more insight for ambiguous cases, such as the lifetime of the state in . The experimental data are compared with theoretical values from a single- approximation, with state-dependent effective charges derived from and with the results from shell-model calculations performed using the SR88MHJM interaction in the model space.
{"title":"Lifetime measurement in Ru94 and Tc93 to investigate seniority conservation in the N=50 isotones","authors":"M. Ley, J. Jolie, L. Knafla, A. Blazhev, A. Esmaylzadeh, C. Fransen, A. Pfeil, J.-M. Régis, P. Van Isacker","doi":"10.1103/physrevc.110.034320","DOIUrl":"https://doi.org/10.1103/physrevc.110.034320","url":null,"abstract":"Low-lying excited states in <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi>Tc</mi><mprescripts></mprescripts><none></none><mn>93</mn></mmultiscripts></math> and <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi>Ru</mi><mprescripts></mprescripts><none></none><mn>94</mn></mmultiscripts></math> were populated using the two fusion-evaporation reactions <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mmultiscripts><mi>Zr</mi><mprescripts></mprescripts><none></none><mn>90</mn></mmultiscripts><mo>(</mo><mmultiscripts><mi>Li</mi><mprescripts></mprescripts><none></none><mn>6</mn></mmultiscripts><mo>,</mo><mn>3</mn><mi>n</mi><mo>)</mo><mmultiscripts><mi>Tc</mi><mprescripts></mprescripts><none></none><mn>93</mn></mmultiscripts></mrow></math> and <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mmultiscripts><mi>Mo</mi><mprescripts></mprescripts><none></none><mn>92</mn></mmultiscripts><mo>(</mo><mi>α</mi><mo>,</mo><mn>2</mn><mi>n</mi><mo>)</mo><mmultiscripts><mi>Ru</mi><mprescripts></mprescripts><none></none><mn>94</mn></mmultiscripts></mrow></math> at the Cologne FN Tandem accelerator and their lifetimes were measured using a hybrid setup of high-purity germanium and fast cerium doped lanthanum bromide detectors for <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>γ</mi><mtext>−</mtext><mi>γ</mi></mrow></math> fast-timing. The measured lifetimes fill gaps in the experimental data for electromagnetic transition probabilities <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>B</mi><mo>(</mo><mi>σ</mi><mi>λ</mi><mo>)</mo></mrow></math> along the <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>N</mi><mo>=</mo><mn>50</mn></mrow></math> isotonic chain and provide more insight for ambiguous cases, such as the lifetime of the <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msubsup><mn>4</mn><mrow><mn>1</mn></mrow><mo>+</mo></msubsup></math> state in <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi>Ru</mi><mprescripts></mprescripts><none></none><mn>94</mn></mmultiscripts></math>. The experimental data are compared with theoretical <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>B</mi><mo>(</mo><mi>E</mi><mn>2</mn><mo>)</mo></mrow></math> values from a single-<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi>j</mi></math> approximation, with state-dependent effective charges derived from <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi>Mo</mi><mprescripts></mprescripts><none></none><mn>92</mn></mmultiscripts></math> and with the results from shell-model calculations performed using the SR88MHJM interaction in the <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>π</mi><mo>(</mo><mn>1</mn><msub><mi>p</mi><mrow><mn>1</mn><mo>/</mo><mn>2</mn></mrow></msub><mo>,</mo><mspace width=\"0.16em\"></mspace><mn>0</mn><msub><mi>g</mi><mrow><mn>9</mn><mo>/</mo><mn>2</mn></mrow></msub><mo>)</mo></mrow></math> model space.","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142256106","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}
Pub Date : 2024-09-18DOI: 10.1103/physrevc.110.034321
W. S. Porter, B. Liu, D. Ray, A. A. Valverde, M. Li, M. R. Mumpower, M. Brodeur, D. P. Burdette, N. Callahan, A. Cannon, J. A. Clark, D. E. M. Hoff, A. M. Houff, F. G. Kondev, A. E. Lovell, A. T. Mohan, G. E. Morgan, C. Quick, G. Savard, K. S. Sharma, T. M. Sprouse, L. Varriano
Atomic masses are a foundational quantity in our understanding of nuclear structure, astrophysics, and fundamental symmetries. The longstanding goal of creating a predictive global model for the binding energy of a nucleus remains a significant challenge, however, and prompts the need for precise measurements of atomic masses to serve as anchor points for model developments. We present precise mass measurements of neutron-rich Ru and Pd isotopes performed at the Californium Rare Isotope Breeder Upgrade facility at Argonne National Laboratory using the Canadian Penning Trap mass spectrometer. The masses of , and were measured to a relative mass precision via the phase-imaging ion-cyclotron-resonance technique, and represent an improvement of approximately an order of magnitude over previous measurements. These mass data were used in conjunction with the physically interpretable machine learning (PIML) model, which uses a mixture density neural network to model mass excesses via a mixture of Gaussian distributions. The effects of our new mass data on a Bayesian-updating of a PIML model are presented.
{"title":"Investigating the effects of precise mass measurements of Ru and Pd isotopes on machine learning mass modeling","authors":"W. S. Porter, B. Liu, D. Ray, A. A. Valverde, M. Li, M. R. Mumpower, M. Brodeur, D. P. Burdette, N. Callahan, A. Cannon, J. A. Clark, D. E. M. Hoff, A. M. Houff, F. G. Kondev, A. E. Lovell, A. T. Mohan, G. E. Morgan, C. Quick, G. Savard, K. S. Sharma, T. M. Sprouse, L. Varriano","doi":"10.1103/physrevc.110.034321","DOIUrl":"https://doi.org/10.1103/physrevc.110.034321","url":null,"abstract":"Atomic masses are a foundational quantity in our understanding of nuclear structure, astrophysics, and fundamental symmetries. The longstanding goal of creating a predictive global model for the binding energy of a nucleus remains a significant challenge, however, and prompts the need for precise measurements of atomic masses to serve as anchor points for model developments. We present precise mass measurements of neutron-rich Ru and Pd isotopes performed at the Californium Rare Isotope Breeder Upgrade facility at Argonne National Laboratory using the Canadian Penning Trap mass spectrometer. The masses of <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi>Ru</mi><mprescripts></mprescripts><none></none><mn>108</mn></mmultiscripts><mo>,</mo><mo> </mo><mmultiscripts><mi>Ru</mi><mprescripts></mprescripts><none></none><mn>110</mn></mmultiscripts></math>, and <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi>Pd</mi><mprescripts></mprescripts><none></none><mn>116</mn></mmultiscripts></math> were measured to a relative mass precision <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>δ</mi><mi>m</mi><mo>/</mo><mi>m</mi><mo>≈</mo><msup><mn>10</mn><mrow><mo>−</mo><mn>8</mn></mrow></msup></mrow></math> via the phase-imaging ion-cyclotron-resonance technique, and represent an improvement of approximately an order of magnitude over previous measurements. These mass data were used in conjunction with the physically interpretable machine learning (PIML) model, which uses a mixture density neural network to model mass excesses via a mixture of Gaussian distributions. The effects of our new mass data on a Bayesian-updating of a PIML model are presented.","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142256107","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}
Pub Date : 2024-09-17DOI: 10.1103/physrevc.110.034319
I. Brandherm, P. von Neumann-Cosel, R. Mancino, G. Martínez-Pinedo, H. Matsubara, V. Yu. Ponomarev, A. Richter, M. Scheck, A. Tamii
Background: Electric and magnetic dipole strengths in nuclei at excitation energies well below the giant resonance region are of interest for a variety of nuclear structure problems including a possible electric dipole toroidal mode or the quenching of spin-isospin flip modes.
{"title":"Electric and magnetic dipole strength in Ni58 from forward-angle proton scattering","authors":"I. Brandherm, P. von Neumann-Cosel, R. Mancino, G. Martínez-Pinedo, H. Matsubara, V. Yu. Ponomarev, A. Richter, M. Scheck, A. Tamii","doi":"10.1103/physrevc.110.034319","DOIUrl":"https://doi.org/10.1103/physrevc.110.034319","url":null,"abstract":"<b>Background:</b> Electric and magnetic dipole strengths in nuclei at excitation energies well below the giant resonance region are of interest for a variety of nuclear structure problems including a possible electric dipole toroidal mode or the quenching of spin-isospin flip modes.","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142255822","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}
Pub Date : 2024-09-17DOI: 10.1103/physrevc.110.034318
Tao Li, Ning Wang, Hong Yao, Xinrui Zhang, Min Liu
The model uncertainties in predictions of nucleon separation energies are investigated based on four nuclear mass models and the measured masses of mirror nuclei. It is found that the discrepancies between model predictions and experimental data for the proton separation energies of a nucleus have a linear relationship with those for the neutron separation energies of its mirror nucleus. With the linear mirror corrections being considered, the root-mean-square deviation of model predictions is reduced by more than for one-proton separation energies, and more than for two-proton separation energies. Simultaneously, , and are suggested as the possible ground-state two-proton decay nuclei according to the predicted separation energies and half-lives.
{"title":"Mirror corrections in predictions of nucleon separation energies for nuclei near the proton drip line","authors":"Tao Li, Ning Wang, Hong Yao, Xinrui Zhang, Min Liu","doi":"10.1103/physrevc.110.034318","DOIUrl":"https://doi.org/10.1103/physrevc.110.034318","url":null,"abstract":"The model uncertainties in predictions of nucleon separation energies are investigated based on four nuclear mass models and the measured masses of mirror nuclei. It is found that the discrepancies between model predictions and experimental data for the proton separation energies of a nucleus have a linear relationship with those for the neutron separation energies of its mirror nucleus. With the linear mirror corrections being considered, the root-mean-square deviation of model predictions is reduced by more than <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mn>56</mn><mo>%</mo></mrow></math> for one-proton separation energies, and more than <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mn>47</mn><mo>%</mo></mrow></math> for two-proton separation energies. Simultaneously, <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi>Ca</mi><mprescripts></mprescripts><none></none><mn>34</mn></mmultiscripts><mo>,</mo><mo> </mo><mmultiscripts><mi>Ti</mi><mprescripts></mprescripts><none></none><mn>38</mn></mmultiscripts></math>, and <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi>Se</mi><mprescripts></mprescripts><none></none><mn>62</mn></mmultiscripts></math> are suggested as the possible ground-state two-proton decay nuclei according to the predicted separation energies and half-lives.","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142255821","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}
Pub Date : 2024-09-17DOI: 10.1103/physrevc.110.034907
Zaining Wang, Jinhui Chen, Hao-jie Xu, Jie Zhao
Relativistic heavy ion collisions provide a unique opportunity to study the shape of colliding nuclei, even up to higher-order multipole deformations. In this work, several observables that are sensitive to quadrupole and hexadecapole deformations of uranium-238 in relativistic collisions have been systematically investigated with a multi-phase transport model. We find that the flow harmonic , the and mean transverse momentum correlation, and the three-particle asymmetry cumulant are sensitive to nuclear quadrupole deformation, while and nonlinear response coefficient are sensitive to nuclear hexadecapole deformation. Our results from transport model studies are in qualitative agreement with previous hydrodynamic studies. The results indicate that the uncertainties of the hexadecapole deformation of uranium on the quadrupole deformation determination can be reduced by the abundance of correlation observables provided by the relativistic heavy ion collisions.
{"title":"Systematic investigation of the nuclear multipole deformations in U+U collisions with a multi-phase transport model","authors":"Zaining Wang, Jinhui Chen, Hao-jie Xu, Jie Zhao","doi":"10.1103/physrevc.110.034907","DOIUrl":"https://doi.org/10.1103/physrevc.110.034907","url":null,"abstract":"Relativistic heavy ion collisions provide a unique opportunity to study the shape of colliding nuclei, even up to higher-order multipole deformations. In this work, several observables that are sensitive to quadrupole and hexadecapole deformations of uranium-238 in relativistic <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mtext>U</mtext><mo>+</mo><mtext>U</mtext></math> collisions have been systematically investigated with a multi-phase transport model. We find that the flow harmonic <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>v</mi><mn>2</mn></msub></math>, the <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>v</mi><mn>2</mn></msub></math> and mean transverse momentum correlation, and the three-particle asymmetry cumulant <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><msub><mi>ac</mi><mn>2</mn></msub><mrow><mo>{</mo><mn>3</mn><mo>}</mo></mrow></mrow></math> are sensitive to nuclear quadrupole deformation, while <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><msub><mi>ac</mi><mn>2</mn></msub><mrow><mo>{</mo><mn>3</mn><mo>}</mo></mrow></mrow></math> and nonlinear response coefficient <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>χ</mi><mrow><mn>4</mn><mo>,</mo><mn>22</mn></mrow></msub></math> are sensitive to nuclear hexadecapole deformation. Our results from transport model studies are in qualitative agreement with previous hydrodynamic studies. The results indicate that the uncertainties of the hexadecapole deformation of uranium on the quadrupole deformation determination can be reduced by the abundance of correlation observables provided by the relativistic heavy ion collisions.","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142255823","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}
Pub Date : 2024-09-17DOI: 10.1103/physrevc.110.034317
Tong Li (李通), Nicolas Schunck, Mike Grosskopf
Electromagnetic multipole responses are key inputs to model the structure, decay, and reactions of atomic nuclei. With the introduction of the finite amplitude method (FAM), large-scale calculations of the nuclear linear response in heavy deformed nuclei have become possible. This work provides a detailed study of multipole responses in actinide nuclei with Skyrme energy density functionals. We quantify both systematic and statistical uncertainties induced by the functional parametrization in FAM calculations. We also extend the FAM formalism to perform blocking calculations with the equal filling approximation for odd-mass and odd-odd nuclei, and analyze the impact of blocking configurations on the response. By examining the entire plutonium isotopic chain from the proton to the neutron drip line, we find a large variability of the response with the neutron number and study how it correlates with the deformation of the nuclear ground state.
{"title":"Multipole responses in fissioning nuclei and their uncertainties","authors":"Tong Li (李通), Nicolas Schunck, Mike Grosskopf","doi":"10.1103/physrevc.110.034317","DOIUrl":"https://doi.org/10.1103/physrevc.110.034317","url":null,"abstract":"Electromagnetic multipole responses are key inputs to model the structure, decay, and reactions of atomic nuclei. With the introduction of the finite amplitude method (FAM), large-scale calculations of the nuclear linear response in heavy deformed nuclei have become possible. This work provides a detailed study of multipole responses in actinide nuclei with Skyrme energy density functionals. We quantify both systematic and statistical uncertainties induced by the functional parametrization in FAM calculations. We also extend the FAM formalism to perform blocking calculations with the equal filling approximation for odd-mass and odd-odd nuclei, and analyze the impact of blocking configurations on the response. By examining the entire plutonium isotopic chain from the proton to the neutron drip line, we find a large variability of the response with the neutron number and study how it correlates with the deformation of the nuclear ground state.","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142255824","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}
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