arXiv - PHYS - Nuclear Theory最新文献

Optimization of Nuclear Mass Models Using Algorithms and Neural Networks 利用算法和神经网络优化核质量模型

arXiv - PHYS - Nuclear Theory Pub Date : 2024-09-18 DOI: arxiv-2409.11930

Jin Li, Hang Yang

引用次数: 0

Photo-nuclear reaction rates of $^{157,159}$Ho and $^{163,165}$Tm and their impact in the $γ$--process $^{157,159}$Ho和$^{163,165}$Tm的光核反应速率及其在$γ$--过程中的影响

arXiv - PHYS - Nuclear Theory Pub Date : 2024-09-18 DOI: arxiv-2409.11710

Hao Cheng, Bao-Hua Sun, Li-Hua Zhu, Motohiko Kusakabe, Yudong Luo, Toshitaka Kajino, Chang-Jian Wang, Xing-Qun Yao, Chuang-Ye He, Fu-Long Liu, Bing Guo

{"title":"Photo-nuclear reaction rates of $^{157,159}$Ho and $^{163,165}$Tm and their impact in the $γ$--process","authors":"Hao Cheng, Bao-Hua Sun, Li-Hua Zhu, Motohiko Kusakabe, Yudong Luo, Toshitaka Kajino, Chang-Jian Wang, Xing-Qun Yao, Chuang-Ye He, Fu-Long Liu, Bing Guo","doi":"arxiv-2409.11710","DOIUrl":"https://doi.org/arxiv-2409.11710","url":null,"abstract":"Reliable photo-nuclear reaction rates at the stellar conditions are essential\u0000to understand the origin of the heavy stable neutron-deficient isotopes between\u0000$^{74}$Se and $^{196}$Hg-p-nuclei, however, many reaction rates of relevance\u0000still have to rely on the Hauser-Feshbach model due to rare experimental\u0000progress. One such case is in the mass range of 160 for Dy, Er, Ho and Tm\u0000isotopes. In this work we attempt to constrain the Hauser-Feshbach model in the\u0000TALYS package by reproducing the available experimental data of\u0000$^{160}$Dy($p,gamma$)$^{161}$Ho and $^{162}$Er($p,gamma$)$^{163}$Tm in the\u0000$Asim 160$ mass region, and examine the effects of level density, gamma\u0000strength function and the optical model potential. The constrained model then\u0000allows us to calculate the reaction rates of $^{157, 159}$Ho($gamma$, $p$) and\u0000$^{163,165}$Tm($gamma$, $p$) for the $gamma$-process nucleosynthesis in\u0000carbon-deflagration SNe Ia model. Our recommended rates differ from the JINA\u0000REACLIB by more than 1 order of magnitude in the temperature range of 2-3 GK.\u0000This results in the changes of final abundance of $p$-nuclei in the $Asim 160$\u0000mass range by -5.5-3% from those with JINA, which means that the ($gamma$,\u0000$p$) reactions uncertainty is not predominant for the synthesis of these\u0000nuclei.","PeriodicalId":501573,"journal":{"name":"arXiv - PHYS - Nuclear Theory","volume":"19 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142263261","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Quark saturation in the QCD phase diagram QCD 相图中的夸克饱和

arXiv - PHYS - Nuclear Theory Pub Date : 2024-09-18 DOI: arxiv-2409.12088

Marcus Bluhm, Yuki Fujimoto, Larry McLerran, Marlene Nahrgang

{"title":"Quark saturation in the QCD phase diagram","authors":"Marcus Bluhm, Yuki Fujimoto, Larry McLerran, Marlene Nahrgang","doi":"arxiv-2409.12088","DOIUrl":"https://doi.org/arxiv-2409.12088","url":null,"abstract":"We determine the onset of Quarkyonic Matter corresponding to values of\u0000temperature and baryon chemical potential at which the quark phase space\u0000density becomes one. At zero temperature for baryon chemical potentials below\u0000the mass of the Lambda baryon, only nucleons contribute to the quark density.\u0000This is different at finite temperature, where all baryons, mesons and their\u0000resonances can be excited and thus add quarks to the phase space. The\u0000probability density to find a quark inside a hadron is determined using the\u0000Yukawa ansatz of the IdylliQ model of Quarkyonic Matter. We estimate separately\u0000the magnitude of the various contributions of nucleons, Delta baryons, pions as\u0000well as further hadrons and resonances. The uncertainty in the parametrization\u0000of the probability density to find a quark inside a nucleon is spanned by\u0000assuming that at zero temperature the transition density to Quarkyonic Matter\u0000is between one and three times that of nuclear matter. Various predictions for\u0000a possible critical point associated with the chiral phase transition are found\u0000close to a triple point at which the line of the deconfinement transition and\u0000the curve associated with the transition to Quarkyonic Matter intersect. These\u0000considerations provide an estimate for the region in the QCD phase diagram\u0000where Quarkyonic Matter may be found.","PeriodicalId":501573,"journal":{"name":"arXiv - PHYS - Nuclear Theory","volume":"77 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142263257","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Far-from-equilibrium attractors with Full Relativistic Boltzmann approach in 3+1 D: moments of distribution function and anisotropic flows $v_n$ 3+1 D 中采用全相对论玻尔兹曼方法的远离平衡吸引子：分布函数矩和各向异性流 $v_n$

arXiv - PHYS - Nuclear Theory Pub Date : 2024-09-18 DOI: arxiv-2409.12123

Vincenzo NugaraDepartment of Physics and Astronomy, University of Catania, CataniaINFN-Laboratori Nazionali del Sud, Catania, Italy, Vincenzo GrecoDepartment of Physics and Astronomy, University of Catania, CataniaINFN-Laboratori Nazionali del Sud, Catania, Italy, Salvatore PlumariDepartment of Physics and Astronomy, University of Catania, CataniaINFN-Laboratori Nazionali del Sud, Catania, Italy

{"title":"Far-from-equilibrium attractors with Full Relativistic Boltzmann approach in 3+1 D: moments of distribution function and anisotropic flows $v_n$","authors":"Vincenzo NugaraDepartment of Physics and Astronomy, University of Catania, CataniaINFN-Laboratori Nazionali del Sud, Catania, Italy, Vincenzo GrecoDepartment of Physics and Astronomy, University of Catania, CataniaINFN-Laboratori Nazionali del Sud, Catania, Italy, Salvatore PlumariDepartment of Physics and Astronomy, University of Catania, CataniaINFN-Laboratori Nazionali del Sud, Catania, Italy","doi":"arxiv-2409.12123","DOIUrl":"https://doi.org/arxiv-2409.12123","url":null,"abstract":"We employ the Full Relativistic Boltzmann Transport approach for a conformal\u0000system in 3+1D to study the universal behaviour in moments of the distribution\u0000function and anisotropic flows. We investigate different transverse system\u0000sizes $R$ and interaction strength $eta/s$ and identify universality classes\u0000based upon the interplay between $R$ and the mean free path; we show that each\u0000of this classes can be identified by a particular value of the opacity $hat\u0000gamma$, which has been previously introduced in literature. Our results\u0000highlight that, at early times, the inverse Reynolds number and momentum\u0000moments of the distribution function display universal behaviour, converging to\u0000a 1D attractor driven by longitudinal expansion. This indicates that systems of\u0000different sizes and interaction strengths tend to approach equilibrium in a\u0000similar manner. We provide a detailed analysis of how the onset of transverse\u0000flow affects these moments at later times. Moreover, we investigate the system\u0000size and $eta/s$ dependence for the harmonic flows $v_2$, $v_3$, $v_4$ and\u0000their response functions, along with the impact of the $eta/s$ and the system\u0000transverse size on the dissipation of initial azimuthal correlations in\u0000momentum space. Finally, we introduce the normalised elliptic flow\u0000$v_2/v_{2,eq}$, showing the emergence of attractor behaviour in the regime of\u0000large opacity. These results offer new insights into how different systems\u0000evolve towards equilibrium and the role that system size and interaction play\u0000in this process.","PeriodicalId":501573,"journal":{"name":"arXiv - PHYS - Nuclear Theory","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142263260","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Quantum Magic and Multi-Partite Entanglement in the Structure of Nuclei 核结构中的量子魔力和多方纠缠

arXiv - PHYS - Nuclear Theory Pub Date : 2024-09-18 DOI: arxiv-2409.12064

Florian Brökemeier, S. Momme Hengstenberg, James W. T. Keeble, Caroline E. P. Robin, Federico Rocco, Martin J. Savage

{"title":"Quantum Magic and Multi-Partite Entanglement in the Structure of Nuclei","authors":"Florian Brökemeier, S. Momme Hengstenberg, James W. T. Keeble, Caroline E. P. Robin, Federico Rocco, Martin J. Savage","doi":"arxiv-2409.12064","DOIUrl":"https://doi.org/arxiv-2409.12064","url":null,"abstract":"Motivated by the Gottesman-Knill theorem, we present a detailed study of the\u0000quantum complexity of $p$-shell and $sd$-shell nuclei. Valence-space nuclear\u0000shell-model wavefunctions generated by the BIGSTICK code are mapped to qubit\u0000registers using the Jordan-Wigner mapping (12 qubits for the $p$-shell and 24\u0000qubits for the $sd$-shell), from which measures of the many-body entanglement\u0000($n$-tangles) and magic (non-stabilizerness) are determined. While exact\u0000evaluations of these measures are possible for nuclei with a modest number of\u0000active nucleons, Monte Carlo simulations are required for the more complex\u0000nuclei. The broadly-applicable Pauli-String $IZ$ exact (PSIZe-) MCMC technique\u0000is introduced to accelerate the evaluation of measures of magic in deformed\u0000nuclei (with hierarchical wavefunctions), by factors of $sim 8$ for some\u0000nuclei. Significant multi-nucleon entanglement is found in the $sd$-shell,\u0000dominated by proton-neutron configurations, along with significant measures of\u0000magic. This is evident not only for the deformed states, but also for nuclei on\u0000the path to instability via regions of shape coexistence and level inversion.\u0000These results indicate that quantum-computing resources will accelerate\u0000precision simulations of such nuclei and beyond.","PeriodicalId":501573,"journal":{"name":"arXiv - PHYS - Nuclear Theory","volume":"88 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142263258","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Approximation method for the nuclear structure functions at small $x$ 小 x$ 时核结构函数的近似方法

arXiv - PHYS - Nuclear Theory Pub Date : 2024-09-17 DOI: arxiv-2409.11154

G. R. Boroun

引用次数: 0

Nuclear masses and fission barriers within the isospin-square liquid drop model 等空方液滴模型中的核质量和裂变势垒

arXiv - PHYS - Nuclear Theory Pub Date : 2024-09-17 DOI: arxiv-2409.11019

Krzysztof Pomorski

引用次数: 0

Spin kinetic theory with a nonlocal relaxation time approximation 采用非局部弛豫时间近似的自旋动力学理论

arXiv - PHYS - Nuclear Theory Pub Date : 2024-09-17 DOI: arxiv-2409.11045

Nora Weickgenannt, Jean-Paul Blaizot

引用次数: 0

Higher forbidden unique $β^-$ decay transitions and shell-model interpretation 更高的禁区独特 $β^-$ 衰变跃迁和壳模型解释

arXiv - PHYS - Nuclear Theory Pub Date : 2024-09-17 DOI: arxiv-2409.11244

Archana Saxena, Praveen C. Srivastava

引用次数: 0

Vetting quark-star models with gravitational waves in the hierarchical Bayesian framework 在分层贝叶斯框架中用引力波检验夸克星模型

arXiv - PHYS - Nuclear Theory Pub Date : 2024-09-17 DOI: arxiv-2409.11103

Ziming Wang, Yong Gao, Dicong Liang, Junjie Zhao, Lijing Shao

{"title":"Vetting quark-star models with gravitational waves in the hierarchical Bayesian framework","authors":"Ziming Wang, Yong Gao, Dicong Liang, Junjie Zhao, Lijing Shao","doi":"arxiv-2409.11103","DOIUrl":"https://doi.org/arxiv-2409.11103","url":null,"abstract":"The recent discovery of gravitational waves (GWs) has opened a new avenue for\u0000investigating the equation of state (EOS) of dense matter in compact stars,\u0000which is an outstanding problem in astronomy and nuclear physics. In the\u0000future, next-generation (XG) GW detectors will be constructed, deemed to\u0000provide a large number of high-precision observations. We investigate the\u0000potential of constraining the EOS of quark stars (QSs) with high-precision\u0000measurements of mass $m$ and tidal deformability $Lambda$ from the XG GW\u0000observatories. We adopt the widely-used bag model for QSs, consisting of four\u0000microscopic parameters: the effective bag constant $B_{rm eff}$, the\u0000perturbative quantum chromodynamics correction parameter $a_4$, the strange\u0000quark mass $m_s$, and the pairing energy gap $Delta$. With the help of\u0000hierarchical Bayesian inference, for the first time we are able to infer the\u0000EOS of QSs combining multiple GW observations. Using the top 25 loudest GW\u0000events in our simulation, we find that, the constraints on $B_{rm eff}$ and\u0000$Delta$ are tightened by several times, while $a_4$ and $m_s$ are still poorly\u0000constrained. We also study a simplified 2-dimensional (2-d) EOS model which was\u0000recently proposed in literature. The 2-d model is found to exhibit significant\u0000parameter-estimation biases as more GW events are analyzed, while the predicted\u0000$m$-$Lambda$ relation remains consistent with the full model.","PeriodicalId":501573,"journal":{"name":"arXiv - PHYS - Nuclear Theory","volume":"95 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142263265","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0