Journal of Physics G: Nuclear and Particle Physics最新文献_第9页

Dipole responses in γ−soft 124-134Xe in the spectroscopic energy region γ−软124-134Xe在能谱区的偶极子响应

IF 3.5 3区物理与天体物理

Journal of Physics G: Nuclear and Particle Physics Pub Date : 2022-11-17 DOI: 10.1088/1361-6471/aca3c0

H. Quliyev, E. Guliyev, A. A. Kuliev

引用次数: 0

Microscopic calculation of the electromagnetic dipole strength for 239,243Pu isotopes 239,243Pu同位素电磁偶极子强度的微观计算

IF 3.5 3区物理与天体物理

Journal of Physics G: Nuclear and Particle Physics Pub Date : 2022-11-17 DOI: 10.1088/1361-6471/aca3bf

H. Yakut, E. Tabar, E. Kemah, G. Hoşgör

{"title":"Microscopic calculation of the electromagnetic dipole strength for 239,243Pu isotopes","authors":"H. Yakut, E. Tabar, E. Kemah, G. Hoşgör","doi":"10.1088/1361-6471/aca3bf","DOIUrl":"https://doi.org/10.1088/1361-6471/aca3bf","url":null,"abstract":"\u0000 This work investigates the electric and magnetic dipole (E1 and M1) responses for 239,243Pu isotopes based on the quasiparticle phonon nuclear model (QPNM) by adding the residual interactions for addressing the violations of rotational, translational, and Galilean symmetries caused by the mean-field approach, for the first time. We focus on the E1 and M1 dipole strengths and photo-absorption cross sections up to 20 MeV, and the results reveal that the giant dipole resonance (GDR) best describes the experimental trend with a ratio of 95%. It appears that most of the E1 strength is found at Ex=8–20 MeV, but the total B(E1)↑ strength for the pygmy dipole resonance (PDR) at Ex=4–8 MeV accounts for some 1.83 e2fm2, which in turn corresponds to 2% of the Thomas–Reiche–Kuhn (TRK) sum rule. Furthermore, the resultant total B(M1)↑ value for the scissors mode strength below 4 MeV is 5.65 , which is lower than that of the Oslo data (10.1(15) ). However, the theoretically predicted scissors resonance structure with two peaks in the 1–3.5 MeV energy range exhibits a similar trend to that found in the Oslo data.","PeriodicalId":16766,"journal":{"name":"Journal of Physics G: Nuclear and Particle Physics","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2022-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48485282","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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: 1

Measurement of excitation functions for nat Cu(α,x) reactions with detailed covariance analysis 用详细的协方差分析测量nat-Cu（α，x）反应的激发函数

IF 3.5 3区物理与天体物理

Journal of Physics G: Nuclear and Particle Physics Pub Date : 2022-11-10 DOI: 10.1088/1361-6471/aca1d7

Mahesh Choudhary, Aman Sharma, A. Gandhi, N. Singh, P. Dubey, Mahima Upadhyay, Utkarsha Mishra, Nitin Dubey, S. Dasgupta, J. Datta, K. Katovský, Ajay Kumar

引用次数: 2

CP-odd and CP-even weak-basis invariants in the presence of vector-like quarks 类向量夸克存在下的CP奇和CP偶弱基不变量

IF 3.5 3区物理与天体物理

Journal of Physics G: Nuclear and Particle Physics Pub Date : 2022-10-25 DOI: 10.1088/1361-6471/acc349

Francisco Albergaria, Gustavo Castelo-Branco, José Filipe Bastos, J. Silva-Marcos

引用次数: 0

Proton-neutron entanglement in the nuclear shell model 核壳模型中的质子-中子纠缠

IF 3.5 3区物理与天体物理

Journal of Physics G: Nuclear and Particle Physics Pub Date : 2022-10-25 DOI: 10.1088/1361-6471/acbece

C. Johnson, Oliver C. Gorton

引用次数: 12

Progress on nuclear reaction rates affecting the stellar production of 26Al 影响26Al恒星生成的核反应速率研究进展

IF 3.5 3区物理与天体物理

Journal of Physics G: Nuclear and Particle Physics Pub Date : 2022-10-24 DOI: 10.1088/1361-6471/ac9cf8

A. Laird, M. Lugaro, A. Kankainen, P. Adsley, D. Bardayan, H. Brinkman, B. Côté, C. Deibel, R. Diehl, F. Hammache, J. den Hartogh, J. José, Deniz Kurtilgil, C. Lederer-Woods, G. Lotay, G. Meynet, S. Palmerini, M. Pignatari, R. Reifarth, N. de Séréville, A. Sieverding, R. Stancliffe, T. Trueman, T. Lawson, J. Vink, C. Massimi, A. Mengoni

{"title":"Progress on nuclear reaction rates affecting the stellar production of 26Al","authors":"A. Laird, M. Lugaro, A. Kankainen, P. Adsley, D. Bardayan, H. Brinkman, B. Côté, C. Deibel, R. Diehl, F. Hammache, J. den Hartogh, J. José, Deniz Kurtilgil, C. Lederer-Woods, G. Lotay, G. Meynet, S. Palmerini, M. Pignatari, R. Reifarth, N. de Séréville, A. Sieverding, R. Stancliffe, T. Trueman, T. Lawson, J. Vink, C. Massimi, A. Mengoni","doi":"10.1088/1361-6471/ac9cf8","DOIUrl":"https://doi.org/10.1088/1361-6471/ac9cf8","url":null,"abstract":"\u0000 The radioisotope 26Al is a key observable for nucleosynthesis in the Galaxy and the environment of the early Solar System. To properly interpret the large variety of astronomical and meteoritic data, it is crucial to understand both the nuclear reactions involved in the production of 26Al in the relevant stellar sites and the physics of such sites. These range from the winds of low- and intermediate-mass asymptotic giant branch (AGB) stars; to massive and very massive stars, both their Wolf-Rayet (WR) winds and their final core-collapse supernovae (CCSN); and the ejecta from novae, the explosions that occur on the surface of a white dwarf accreting material from a stellar companion. Several reactions affect the production of 26Al in these astrophysical objects, including (but not limited to) 25Mg(p,γ)26Al, 26Al(p,γ)27Si, and 26Al(n,p/α). Extensive experimental effort has been spent during recent years to improve our understanding of such key reactions. Here we present a summary of the astrophysical motivation for the study of 26Al, a review of its production in the different stellar sites, and a timely evaluation of the currently available nuclear data. We also provide recommendations for the nuclear input into stellar models and suggest relevant, future experimental work.","PeriodicalId":16766,"journal":{"name":"Journal of Physics G: Nuclear and Particle Physics","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2022-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44212130","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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: 3

Light speed variation from GRB 221009A GRB 221009A的光速变化

IF 3.5 3区物理与天体物理

Journal of Physics G: Nuclear and Particle Physics Pub Date : 2022-10-20 DOI: 10.1088/1361-6471/accebb

Jie Zhu, B. Ma

引用次数: 9

Fractional calculus within the optical model used in nuclear and particle physics 核物理和粒子物理中使用的光学模型中的分数微积分

IF 3.5 3区物理与天体物理

Journal of Physics G: Nuclear and Particle Physics Pub Date : 2022-09-28 DOI: 10.1088/1361-6471/acbe58

R. Herrmann

{"title":"Fractional calculus within the optical model used in nuclear and particle physics","authors":"R. Herrmann","doi":"10.1088/1361-6471/acbe58","DOIUrl":"https://doi.org/10.1088/1361-6471/acbe58","url":null,"abstract":"\u0000 The optical model is a fundamental tool to describe scattering processes in nuclear physics. The basic input is an optical model potential, which describes the refraction and absorption processes more or less schematically. Of special interest is the form of the absorption potential. With increasing energy of the incident projectile, a derivation of this potential must take into account the observed energy dependent transition from surface to volume type. The classic approach has weaknesses in this regard. We will discuss these deficiencies and will propose an alternative method based on concepts developed within the framework of fractional calculus, which allows to describe a smooth transition from surface to volume absorption in an appropriate way. Of special interest is the form of the absorption potential. With increasing energy of the incident projectile, a derivation of this potential must take into account energy dependent transition from imaginary surface to volume terms. We discuss the deficiencies of the classical approach and propose an alternative method based on concepts developed within the framework of fractional calculus, which allows to describe a smooth transition from surface to volume absorption in a natural way.","PeriodicalId":16766,"journal":{"name":"Journal of Physics G: Nuclear and Particle Physics","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2022-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49615119","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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: 1

Deformation dependence of 2p-radioactivity half-lives: Probe with a new formula across the mass region with Z<82 2p放射性半衰期的变形依赖性：在Z<82的质量区域使用新公式的探针

IF 3.5 3区物理与天体物理

Journal of Physics G: Nuclear and Particle Physics Pub Date : 2022-09-26 DOI: 10.1088/1361-6471/ac991d

G. Saxena, M. Aggarwal, D. Singh, A. Jain, P. K. Sharma, H. L. Yadav

引用次数: 2

Pion-mediated Cooper pairing of neutrons: beyond the bare vertex approximation 中子介子介导的库珀对:超越裸顶点近似

IF 3.5 3区物理与天体物理

Journal of Physics G: Nuclear and Particle Physics Pub Date : 2022-09-21 DOI: 10.1088/1361-6471/acdfec

Hao Zhu, Guo-Zhu Liu

{"title":"Pion-mediated Cooper pairing of neutrons: beyond the bare vertex approximation","authors":"Hao Zhu, Guo-Zhu Liu","doi":"10.1088/1361-6471/acdfec","DOIUrl":"https://doi.org/10.1088/1361-6471/acdfec","url":null,"abstract":"\u0000 In some quantum many particle systems, the fermions could form Cooper pairs by exchanging intermediate bosons. This then drives a superconducting phase transition or a superfluid transition. Such transitions should be theoretically investigated by using proper non-perturbative methods. Here we take the neutron superfluid transition as an example and study the Cooper pairing of neutrons mediated by neutral $pi$-mesons in the low density region of a neutron matter. We perform a non-perturbative analysis of the neutron-meson coupling and compute the pairing gap $Delta_{s}$, the critical density $rho_{c}$, and the critical temperature $T_c$ by solving the Dyson-Schwinger equation of the neutron propagator. We first carry out calculations under the widely used bare vertex approximation and then incorporate the contribution of the lowest-order vertex correction. This vertex correction is not negligible even at low densities and its importance is further enhanced as the density increases. The transition critical line on density-temperature plane obtained under the bare vertex approximation is substantially changed after including the vertex correction. These results indicate that the vertex corrections play a significant role and need to be seriously taken into account.","PeriodicalId":16766,"journal":{"name":"Journal of Physics G: Nuclear and Particle Physics","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2022-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49114028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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