Nuclear Physics A最新文献_第6页

Half-life measurement of short-lived nuclide 146Eu 短寿命核素146Eu的半衰期测定

IF 1.7 4区物理与天体物理

Nuclear Physics A Pub Date : 2025-04-16 DOI: 10.1016/j.nuclphysa.2025.123113

Changxin Guo, Yunju Li, Shengquan Yan, Minghao Zhu, Youbao Wang, Yuqiang Zhang, Jinlong Ma, Wei Nan, Tao Tian, Jianglin Hou, Jiayinhao Li

{"title":"Half-life measurement of short-lived nuclide 146Eu","authors":"Changxin Guo, Yunju Li, Shengquan Yan, Minghao Zhu, Youbao Wang, Yuqiang Zhang, Jinlong Ma, Wei Nan, Tao Tian, Jianglin Hou, Jiayinhao Li","doi":"10.1016/j.nuclphysa.2025.123113","DOIUrl":"10.1016/j.nuclphysa.2025.123113","url":null,"abstract":"<div><div>146Sm is an important nuclide for both geochronological and astrophysical applications, its precise half-life value is essential for accurate geological applications. Nevertheless, significant discrepancies exist in the measured half-life values of 146Sm. A new experimental method has been proposed by merely measuring the total amount of 146Eu and the decay of 146Sm, corresponding α and γ spectrometers have been developed for the measurement. The preliminary experiment has been carried out in HI-13 tandem accelerator of China Institute of Atomic Energy. Based on α and γ measurements, the half-life of 147Eu has been double checked and the results agree well with existing values, which gives a verification for the reliability of our half-life measurement systems. The half-life of 146Eu has been updated to <math><mn>4.21</mn><mo>±</mo><mn>0.05</mn></math> days, which is 9% lower than the value reported in the database. Based on our analysis, this difference has a significant impact on the determination of the number of 146Eu atoms, and consequently has an equivalent impact on the measurement of 146Sm half-life.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1060 ","pages":"Article 123113"},"PeriodicalIF":1.7,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143860488","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

Constraining (n,γ) cross sections via surrogate measurements with hyperion 约束（n,γ）截面通过替代测量与hyperion

IF 1.7 4区物理与天体物理

Nuclear Physics A Pub Date : 2025-04-16 DOI: 10.1016/j.nuclphysa.2025.123110

J. Koros , A. Simon , J.T. Harke , R.O. Hughes , P. Adsley , B.H. Isselhardt , B. Longfellow , M. Matney , C.S. Reingold

引用次数: 0

The nuclear matter effect on parton distribution functions 核物质对部分子分布函数的影响

IF 1.7 4区物理与天体物理

Nuclear Physics A Pub Date : 2025-04-16 DOI: 10.1016/j.nuclphysa.2025.123111

Weihua Yang , Chao Li

{"title":"The nuclear matter effect on parton distribution functions","authors":"Weihua Yang , Chao Li","doi":"10.1016/j.nuclphysa.2025.123111","DOIUrl":"10.1016/j.nuclphysa.2025.123111","url":null,"abstract":"<div><div>Parton distribution functions (PDFs) are important quantities in describing nucleon structures. They are universal and process-independent. As a matter of fact, nucleon PDFs are inevitably affected by nuclear matter during nuclear scattering process. In order to study the nuclear PDFs (nPDFs), in this paper, we introduce the nucleon pair PDFs (dPDFs) to describe parton distributions in the nucleon pair which is confined to a nucleus. We first of all construct the nuclear state in terms of the nucleonic states and calculate the operator definition of nPDFs. Neglecting the higher order corrections or multi-nucleon correlations, we find that nPDFs can be written as a sum of two terms which respectively correspond to PDFs and dPDFs. Nucleon pair PDFs which stem from nucleon-nucleon correlation are proportional to common nucleon PDFs but suppressed by a factor. Compared with the experimental data, we find that dPDFs can explain the behaviour of the EMC effect. We further calculate the Paschos-Wolfenstein ratio to study the nuclear matter effect on the extraction of weak mixing angle or <math><msup><mrow><mi>sin</mi></mrow><mrow><mn>2</mn></mrow></msup><mo>⁡</mo><msub><mrow><mi>θ</mi></mrow><mrow><mi>W</mi></mrow></msub></math> by using dPDFs.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1060 ","pages":"Article 123111"},"PeriodicalIF":1.7,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143842752","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

Progress of underground nuclear astrophysics JUNA 地下核天体物理学进展[j]

IF 1.7 4区物理与天体物理

Nuclear Physics A Pub Date : 2025-04-16 DOI: 10.1016/j.nuclphysa.2025.123112

Weiping Liu , JUNA Collaboration

引用次数: 0

Radiative α capture on 12C in cluster effective field theory: Short review 簇有效场理论中12C的辐射α俘获：简要评述

IF 1.7 4区物理与天体物理

Nuclear Physics A Pub Date : 2025-04-15 DOI: 10.1016/j.nuclphysa.2025.123108

Shung-Ichi Ando

{"title":"Radiative α capture on 12C in cluster effective field theory: Short review","authors":"Shung-Ichi Ando","doi":"10.1016/j.nuclphysa.2025.123108","DOIUrl":"10.1016/j.nuclphysa.2025.123108","url":null,"abstract":"<div><div>Study of radiative α capture on 12C, 12C(α,γ)16O, in cluster effective field theory (EFT) is reviewed. A low energy EFT for 12C(α,γ)16O at the Gamow-peak energy, <math><msub><mrow><mi>E</mi></mrow><mrow><mi>G</mi></mrow></msub><mo>=</mo><mn>0.3</mn></math> MeV, is constructed, and the theory is first applied to the study of elastic α-12C scattering at low energies. The effective range parameters are fitted to the precise phase shift data of the elastic scattering and the astrophysical <math><msub><mrow><mi>S</mi></mrow><mrow><mi>E</mi><mn>1</mn></mrow></msub></math> factor of the E1 transition of 12C(α,γ)16O at <math><msub><mrow><mi>E</mi></mrow><mrow><mi>G</mi></mrow></msub></math> is estimated. For the study of the E2 transition of 12C(α,γ)16O, we discuss a difficulty to determine the asymptotic normalization coefficient (ANC) of the subthreshold <math><msubsup><mrow><mn>2</mn></mrow><mrow><mn>1</mn></mrow><mrow><mo>+</mo></mrow></msubsup></math> state of 16O from the elastic scattering data, and demonstrate the difficulty with the estimate of the astrophysical <math><msub><mrow><mi>S</mi></mrow><mrow><mi>E</mi><mn>2</mn></mrow></msub></math> factor of 12C(α,γ)16O at <math><msub><mrow><mi>E</mi></mrow><mrow><mi>G</mi></mrow></msub></math>. We discuss the uncertainty in the estimate of the S factors at <math><msub><mrow><mi>E</mi></mrow><mrow><mi>G</mi></mrow></msub></math> in the present approach.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1060 ","pages":"Article 123108"},"PeriodicalIF":1.7,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143838770","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

Bc meson masses and decays: Insights from a relativistic screened potential model Bc介子质量和衰变：来自相对论筛选势模型的见解

IF 1.7 4区物理与天体物理

Nuclear Physics A Pub Date : 2025-04-15 DOI: 10.1016/j.nuclphysa.2025.123109

Chaitanya Anil Bokade, Bhaghyesh

引用次数: 0

Towards lifetime measurement of excited states in 120Sn using thermal neutron capture 用热中子俘获法测量120Sn激发态的寿命

IF 1.7 4区物理与天体物理

Nuclear Physics A Pub Date : 2025-04-15 DOI: 10.1016/j.nuclphysa.2025.123105

F. Wu (吴桐安) , C. Andreoiu , V. Karayonchev , C.M. Petrache , J.-M. Régis , A. Esmaylzadeh , C. Michelagnoli , M. Beuschlein , P. Spagnoletti , G. Colombi , J.M. Daugas , L. Domenichetti , P.E. Garrett , J. Jolie , M. Ley , S. Pannu , E. Taddei , M. von Tresckow

{"title":"Towards lifetime measurement of excited states in 120Sn using thermal neutron capture","authors":"F. Wu (吴桐安) , C. Andreoiu , V. Karayonchev , C.M. Petrache , J.-M. Régis , A. Esmaylzadeh , C. Michelagnoli , M. Beuschlein , P. Spagnoletti , G. Colombi , J.M. Daugas , L. Domenichetti , P.E. Garrett , J. Jolie , M. Ley , S. Pannu , E. Taddei , M. von Tresckow","doi":"10.1016/j.nuclphysa.2025.123105","DOIUrl":"10.1016/j.nuclphysa.2025.123105","url":null,"abstract":"<div><div>The intruder bands in Sn isotopes, based on the 2p-2h excitation across the <math><mi>Z</mi><mo>=</mo><mn>50</mn></math> proton shell gap, are well-known to exhibit shape coexistence near the neutron mid-shell region. The spectroscopic signatures are enhanced E0 transitions between the <math><msup><mrow><mn>0</mn></mrow><mrow><mo>+</mo></mrow></msup></math> band heads and enhanced E2 transitions within rotational bands built on these <math><msup><mrow><mn>0</mn></mrow><mrow><mo>+</mo></mrow></msup></math> band heads. However, lifetime information for the excited <math><msup><mrow><mn>0</mn></mrow><mrow><mo>+</mo></mrow></msup></math> states is incomplete. Experimental details for the neutron-capture reaction and analysis procedures are described, and the first result of the <math><msubsup><mrow><mn>2</mn></mrow><mrow><mn>1</mn></mrow><mrow><mo>+</mo></mrow></msubsup></math> lifetime demonstrates proper calibration of the setup.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1060 ","pages":"Article 123105"},"PeriodicalIF":1.7,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143838769","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 challenging first direct measurement of the 65 keV resonance strength in the 17O(p,γ)18F reaction at LUNA LUNA的17O(p,γ)18F反应中65 keV共振强度的首次直接测量

IF 1.7 4区物理与天体物理

Nuclear Physics A Pub Date : 2025-04-14 DOI: 10.1016/j.nuclphysa.2025.123099

D. Piatti, LUNA collaboration

{"title":"The challenging first direct measurement of the 65 keV resonance strength in the 17O(p,γ)18F reaction at LUNA","authors":"D. Piatti, LUNA collaboration","doi":"10.1016/j.nuclphysa.2025.123099","DOIUrl":"10.1016/j.nuclphysa.2025.123099","url":null,"abstract":"<div><div>A precise determination of the proton capture rates on oxygen is mandatory to predict the abundance ratios of oxygen isotopes in a stellar environment where the hydrogen burning is active. The 17O(p,γ)18F reaction, in particular, plays a crucial role in AGB nucleosynthesis as well as in explosive hydrogen burning occurring in novae and type I supernovae. At the temperature of interest for the former scenario (20 MK ≤ T ≤ 80 MK) the main contribution to the astrophysical reaction rate comes from the <math><msub><mrow><mi>E</mi></mrow><mrow><mi>r</mi></mrow></msub></math> = 64.5 keV resonance. The strength of this resonance is presently determined only through indirect measurements, with an adopted value ωγ = (1.6 ± 0.3) × 10−11 eV. A new high sensitivity setup has been installed at LUNA, located at Laboratori Nazionali del Gran Sasso. The underground location of LUNA 400kV guarantees a reduction of the cosmic ray background by several orders of magnitude. The residual background was further reduced by a dedicated shielding. On the other hand the 4π-BGO detector efficiency was optimized installing an aluminum target chamber and holder. With about 400 C accumulated on Ta2O5 targets, with nominal 17O enrichment of 90%, the LUNA collaboration has performed the first ever direct measurement of the 64.5 keV resonance strength.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1060 ","pages":"Article 123099"},"PeriodicalIF":1.7,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143860490","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

First in-beam experiment in K500 superconducting cyclotron at VECC 中心K500超导回旋加速器首次束流实验

IF 1.7 4区物理与天体物理

Nuclear Physics A Pub Date : 2025-04-11 DOI: 10.1016/j.nuclphysa.2025.123101

T.K. Rana , Samir Kundu , S. Manna , K. Banerjee , P. Karmakar , T.K. Ghosh , G. Mukherjee , A. Sen , R. Pandey , P. Pant , Pratap Roy , R. Shil , S.S. Nayak , K. Rani , K. Atreya , D. Paul , R. Santra , A. Sultana , S. Pal , S. Basu , M.K. Dey

引用次数: 0

Development of a PID algorithm for the CALIFA detector to study multinucleon knockout reactions in exotic nuclei 开发用于 CALIFA 探测器的 PID 算法，以研究奇异原子核中的多核子敲除反应

IF 1.7 4区物理与天体物理

Nuclear Physics A Pub Date : 2025-04-11 DOI: 10.1016/j.nuclphysa.2025.123103

M. Feijoo-Fontán , A. Barrière , N. Mozumdar , H. Álvarez-Pol , J.L. Rodríguez-Sánchez , O. Sorlin , J. Benlliure , D. Cortina-Gil , R3B collaboration

引用次数: 0