Nuclear Physics A最新文献_第6页

Indirect measurement of the 27Al(p,α)24Mg and 27Al(p,γ)28Si cross sections and astrophysical implications 27Al(p,α)24Mg和27Al(p,γ)28Si截面的间接测量及其天体物理意义

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.2025.123107

Marco La Cognata

{"title":"Indirect measurement of the 27Al(p,α)24Mg and 27Al(p,γ)28Si cross sections and astrophysical implications","authors":"Marco La Cognata","doi":"10.1016/j.nuclphysa.2025.123107","DOIUrl":"10.1016/j.nuclphysa.2025.123107","url":null,"abstract":"<div><div>In astrophysics, the presence of <sup>26</sup>Al is vital for investigating nucleosynthesis within the Milky Way and the rate of Galactic core-collapse supernovae. Detection techniques utilize <em>γ</em>-ray lines and compare <sup>26</sup>Mg excess with the prevalent Mg isotope in meteorites. Hence, stable isotopes <sup>27</sup>Al and <sup>24</sup>Mg are crucial, and the MgAl cycle impacting aluminum and magnesium synthesis must be thoroughly examined. Recent observations uncover complexities in stellar groups, whose comprehension may also improve with tighter constraints on the MgAl cycle's closure. The <sup>27</sup>Al(<span><math><msup><mrow><mi>p</mi><mo>,</mo><mi>α</mi><mo>)</mo></mrow><mrow><mn>24</mn></mrow></msup></math></span>Mg and <sup>27</sup>Al(<span><math><msup><mrow><mi>p</mi><mo>,</mo><mi>γ</mi><mo>)</mo></mrow><mrow><mn>28</mn></mrow></msup></math></span>Si reactions, primary <sup>27</sup>Al destruction pathways, are pivotal to these models. Given uncertainties, the Trojan Horse Method is used, enabling precise spectroscopy of the compound nucleus <sup>28</sup>Si. This provides essential cross section data within the relevant astrophysical energy range. The indirect measurement via the <sup>2</sup>H(<sup>27</sup>Al, <span><math><mi>α</mi><msup><mrow></mrow><mrow><mn>24</mn></mrow></msup></math></span>Mg)<em>n</em> reaction allowed for evaluating the 84.3 keV resonance's contribution and setting upper limits on adjacent resonances. This research examines the THM recommended rate's influence on intermediate-mass asymptotic giant branch stars, demonstrating a significant rise in surface aluminum abundance in lower masses due to changes in fusion cross sections, while <sup>24</sup>Mg remains mostly unchanged.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1060 ","pages":"Article 123107"},"PeriodicalIF":1.7,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143825731","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

Dilepton measurements with HADES as probes of hot and dense hadronic matter 用HADES作为热、密强子物质探针的双轻子测量

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.2025.123096

Niklas Schild, HADES Collaboration

引用次数: 0

Nuclear fragmentation at the future electron-ion collider 未来电子-离子对撞机的核碎裂

IF 1.7 4区物理与天体物理

Nuclear Physics A Pub Date : 2025-04-10 DOI: 10.1016/j.nuclphysa.2025.123093

C.A. Bertulani , Y. Kucuk , F.S. Navarra

引用次数: 0

Rotational band based on πf7/2 orbital in 55Mn 基于55Mn中πf7/2轨道的旋转带

IF 1.7 4区物理与天体物理

Nuclear Physics A Pub Date : 2025-04-09 DOI: 10.1016/j.nuclphysa.2025.123092

S. Basu , G. Mukherjee , S. Nandi , S.S. Nayak , S. Bhattacharyya , S. Chakraborty , Soumik Bhattacharya , S. Pal , Shabir Dar , Sneha Das , S. Basak , D. Kumar , Pratap Roy , D. Paul , K. Banerjee , S. Manna , Samir Kundu , T.K. Rana , R. Pandey , S. Samanta , S. Ali

{"title":"Rotational band based on πf7/2 orbital in 55Mn","authors":"S. Basu , G. Mukherjee , S. Nandi , S.S. Nayak , S. Bhattacharyya , S. Chakraborty , Soumik Bhattacharya , S. Pal , Shabir Dar , Sneha Das , S. Basak , D. Kumar , Pratap Roy , D. Paul , K. Banerjee , S. Manna , Samir Kundu , T.K. Rana , R. Pandey , S. Samanta , S. Ali","doi":"10.1016/j.nuclphysa.2025.123092","DOIUrl":"10.1016/j.nuclphysa.2025.123092","url":null,"abstract":"<div><div>The excited states of odd-A nucleus <sup>55</sup>Mn have been investigated using <em>α</em>-induced fusion evaporation reaction to explore the shape driving effect of proton f<sub>7/2</sub> orbital below Z = 28 shell gap. A deformed band structure, based on <span><math><mi>π</mi><msub><mrow><mi>f</mi></mrow><mrow><mn>7</mn><mo>/</mo><mn>2</mn></mrow></msub></math></span> configuration has been identified at lower excitation with firm spin-parity assignments of the levels. Band crossing has been identified for the first time in this nucleus through the observation of back bending in one of the signature partners. The properties of this band has been compared with the similar bands in the neighboring isotopes, <sup>57,59</sup>Mn. The Total Routhian Surface calculations predict prolate shape for all the three Mn isotopes below the band crossing. However, a change in shape is predicted by these calculations at higher frequencies beyond the particle alignment. An unnatural parity state has also been identified in <sup>55</sup>Mn which has been found to decay by E3 and E1 transitions. This observation indicates, for the first time, the presence of octupole correlation in this nucleus. It has been discussed in the light of the octupole correlation observed in its isobar <sup>55</sup>V and other nearby odd-odd nuclei.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1059 ","pages":"Article 123092"},"PeriodicalIF":1.7,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143814748","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

Weakening of shell gap and shape coexistence in 40Mg, 42Si, and 44S 40Mg、42Si和44S中壳隙和形状共存的减弱

IF 1.7 4区物理与天体物理

Nuclear Physics A Pub Date : 2025-04-09 DOI: 10.1016/j.nuclphysa.2025.123091

Pankaj Kumar , Khursheed Ahmad Rather , G.H. Bhat

{"title":"Weakening of shell gap and shape coexistence in 40Mg, 42Si, and 44S","authors":"Pankaj Kumar , Khursheed Ahmad Rather , G.H. Bhat","doi":"10.1016/j.nuclphysa.2025.123091","DOIUrl":"10.1016/j.nuclphysa.2025.123091","url":null,"abstract":"<div><div>The suppression of <em>N</em> = 28 shell closure is expected towards proton deficient nuclei. As a consequence of which, coexistence of different nuclear shapes occurs in the even-even isotones of <em>N</em> = 28. We have applied covariant density functional theory based on the relativistic energy density functional DD-PCX to study the ground state and shape coexistence in <sup>40</sup>Mg, <sup>42</sup>Si, <sup>44</sup>S, and <sup>46</sup>Ar (even-even <em>N</em> = 28 isotones). The binding energy maps, calculated from unconstrained and constrained calculations, indicate a deformed ground state minimum for <sup>40</sup>Mg, <sup>42</sup>Si, and <sup>44</sup>S. Different nuclear shapes are found to coexist in these nuclei within small excitation energies. In <sup>40</sup>Mg and <sup>42</sup>Si, rigid shapes with different deformations coexist with excitation energies around 2-3 MeV, while <sup>44</sup>S is expected not to have any particular shape due to a small value of excitation energy. The quenching of shell gap in these nuclei is related to the inversion of neutron orbits with different values of Ω and quadrupole excitations neutrons across <em>fp</em> orbits. For further investigation of shape coexistence in these nuclei, we have employed the triaxial projected shell model in which the deformation parameters, calculated from covariant density functional theory, are taken in input. The presence of <span><math><msubsup><mrow><mn>0</mn></mrow><mrow><mn>2</mn></mrow><mrow><mo>+</mo></mrow></msubsup></math></span> state in the low-lying energy spectra of these nuclei support existence of shape coexistence in <sup>40</sup>Mg, <sup>42</sup>Si, and <sup>44</sup>S. Furthermore, a reduced value of electric monopole transition strength, in <sup>44</sup>S, is utilized as a probe for weak mixing of prolately and oblately deformed shapes.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1059 ","pages":"Article 123091"},"PeriodicalIF":1.7,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143821159","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

Investigation of the excited states of 114Sn using the GRIFFIN spectrometer at TRIUMF 用TRIUMF的GRIFFIN光谱仪研究114Sn的激发态

IF 1.7 4区物理与天体物理

Nuclear Physics A Pub Date : 2025-04-08 DOI: 10.1016/j.nuclphysa.2025.123090

N.K. Syeda , P. Spagnoletti , C. Andreoiu , C.M. Petrache , D. Annen , R.S. Lubna , V. Vedia , A. Algora , A. Babu , G.C. Ball , S. Bhattacharjee , R. Caballero-Folch , R. Coleman , I. Dillmann , E.G. Fuakye , L.P. Gaffney , F.H. Garcia , A.B. Garnsworthy , P.E. Garrett , C.J. Griffin , T. Zidar

{"title":"Investigation of the excited states of 114Sn using the GRIFFIN spectrometer at TRIUMF","authors":"N.K. Syeda , P. Spagnoletti , C. Andreoiu , C.M. Petrache , D. Annen , R.S. Lubna , V. Vedia , A. Algora , A. Babu , G.C. Ball , S. Bhattacharjee , R. Caballero-Folch , R. Coleman , I. Dillmann , E.G. Fuakye , L.P. Gaffney , F.H. Garcia , A.B. Garnsworthy , P.E. Garrett , C.J. Griffin , T. Zidar","doi":"10.1016/j.nuclphysa.2025.123090","DOIUrl":"10.1016/j.nuclphysa.2025.123090","url":null,"abstract":"<div><div>The semi-magic <figure><img></figure> isotopes display signs of shape coexistence in their excited <span><math><msup><mrow><mn>0</mn></mrow><mrow><mo>+</mo></mrow></msup></math></span> states, which, in contrast to the spherical <span><math><msup><mrow><mn>0</mn></mrow><mrow><mo>+</mo></mrow></msup></math></span> ground states, are deformed. This paper investigates the nuclear structure of <figure><img></figure> using the competing <span><math><msup><mrow><mi>β</mi></mrow><mrow><mo>+</mo></mrow></msup></math></span> decay and electron capture of a radioactive beam of <figure><img></figure> produced at the TRIUMF-ISAC facility using the GRIFFIN spectrometer. This study will allow for an in-depth understanding of the excited <span><math><msup><mrow><mn>0</mn></mrow><mrow><mo>+</mo></mrow></msup></math></span> states in <figure><img></figure>, by focusing on their decay patterns. In the present experiment, transitions at 856.2-keV and 1405.0-keV, which were observed in an earlier <span><math><msup><mrow><mi>β</mi></mrow><mrow><mo>+</mo></mrow></msup></math></span> decay study but not placed in the <figure><img></figure> level scheme, have been assigned to the level scheme in connection to the <span><math><msubsup><mrow><mn>0</mn></mrow><mrow><mn>3</mn></mrow><mrow><mo>+</mo></mrow></msubsup></math></span> level at 2156.0-keV. Properly assigning these transitions refines the level scheme and enhances our understanding of the nuclear structure in <figure><img></figure>.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1059 ","pages":"Article 123090"},"PeriodicalIF":1.7,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143839462","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

Effect of symmetry energy on the structure and α-decay of deformed superheavy nuclei 对称能对形变超重核结构和α-衰变的影响

IF 1.7 4区物理与天体物理

Nuclear Physics A Pub Date : 2025-04-04 DOI: 10.1016/j.nuclphysa.2025.123089

Guoqing Wu , Jianmin Dong

{"title":"Effect of symmetry energy on the structure and α-decay of deformed superheavy nuclei","authors":"Guoqing Wu , Jianmin Dong","doi":"10.1016/j.nuclphysa.2025.123089","DOIUrl":"10.1016/j.nuclphysa.2025.123089","url":null,"abstract":"<div><div>We explore the impact of the density-dependent nuclear symmetry energy on the properties and stability of superheavy nuclei (SHN) based on a deformed relativistic mean-field theory in combination with the BCS method. The interaction ‘family’ based on the well-established FSUGarnet parameter set is introduced by adjusting the nonlinear <span><math><mi>ω</mi><mo>−</mo><mi>ρ</mi></math></span> coupling parameter <span><math><msub><mrow><mi>Λ</mi></mrow><mrow><mtext>V</mtext></mrow></msub></math></span> and <em>ρ</em>-nucleon coupling parameter <span><math><msub><mrow><mi>g</mi></mrow><mrow><mi>ρ</mi></mrow></msub></math></span>. This adjustment allows us to explore various density-dependent behaviors of the symmetry energy while maintaining its value at saturation density. A larger <span><math><msub><mrow><mi>Λ</mi></mrow><mrow><mtext>V</mtext></mrow></msub></math></span> gives larger symmetry energy (but softer due to its small slope) below the saturation density. Under different density-dependent behavior of symmetry energy, the nuclear deformation remains largely unchanged, and the nuclear magicity is also almost not altered distinctly although the single-particle energy levels shift evidently. Intriguingly, although the shell gaps are not altered obviously, the stability of SHN against <em>α</em>-decay is enhanced substantially as the symmetry energy softens because a softer symmetry energy gives a smaller <em>α</em>-decay energy and a much longer lifetime.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1059 ","pages":"Article 123089"},"PeriodicalIF":1.7,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143792696","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

Fragments features and Isoscaling in Ni+Ca systems at the entrance of Fermi energy domain 费米能域入口Ni+Ca体系的碎片特征及等标度

IF 1.7 4区物理与天体物理

Nuclear Physics A Pub Date : 2025-04-04 DOI: 10.1016/j.nuclphysa.2025.123076

E. Geraci , E. De Filippo , G. Cardella , M. Colonna , E. Gambera , B. Gnoffo , C. Maiolino , N.S. Martorana , A. Pagano , E.V. Pagano , S. Pirrone , G. Politi , F. Rizzo , P. Russotto , M. Trimarchi , S. Barlini , R. Bougault , G. Casini , N. Le Neindre , S. Piantelli

引用次数: 0

Probing heavy-ion fusion reaction 136Xe + 64Zn in inverse kinematics 136Xe + 64Zn重离子聚变反应的逆运动学研究

IF 1.7 4区物理与天体物理

Nuclear Physics A Pub Date : 2025-04-02 DOI: 10.1016/j.nuclphysa.2025.123079

J.T. Li , N. Imai , R. Yokoyama , S. Michimasa , T. Chillery , R. Kojima , S. Hanai , N. Kitamura , T. Saito , D. Suzuki , D. Nishimura , M. Amitani , C. Fukushima , Y. Nakamura , R. Kageyama , J. Sonoda , E. Takada , S. Sakaguchi , Z.G. Xiao

引用次数: 0

Damping mechanism of the isoscalar giant monopole resonance in 58Ni 58Ni中等标量巨单极子共振的阻尼机理

IF 1.7 4区物理与天体物理

Nuclear Physics A Pub Date : 2025-04-02 DOI: 10.1016/j.nuclphysa.2025.123078

A. Bahini , P. von Neumann-Cosel , J. Carter , I.T. Usman , N.N. Arsenyev , A.P. Severyukhin , E. Litvinova , R.W. Fearick , R. Neveling , P. Adsley , N. Botha , J.W. Brümmer , L.M. Donaldson , S. Jongile , T.C. Khumalo , M.B. Latif , K.C.W. Li , P.Z. Mabika , P.T. Molema , C.S. Moodley , J.J. van Zyl

{"title":"Damping mechanism of the isoscalar giant monopole resonance in 58Ni","authors":"A. Bahini , P. von Neumann-Cosel , J. Carter , I.T. Usman , N.N. Arsenyev , A.P. Severyukhin , E. Litvinova , R.W. Fearick , R. Neveling , P. Adsley , N. Botha , J.W. Brümmer , L.M. Donaldson , S. Jongile , T.C. Khumalo , M.B. Latif , K.C.W. Li , P.Z. Mabika , P.T. Molema , C.S. Moodley , J.J. van Zyl","doi":"10.1016/j.nuclphysa.2025.123078","DOIUrl":"10.1016/j.nuclphysa.2025.123078","url":null,"abstract":"<div><div>Following the success achieved in explaining the origin of fine structure observed in the isoscalar giant quadrupole resonance (ISGQR) and the isovector giant dipole resonance (IVGDR), fine structure in the region of the isoscalar giant monopole resonance (ISGMR) were investigated using the wavelet analysis in order to investigate the role of different mechanisms contributing to its decay width. In this context, high-energy resolution ISGMR data on many nuclei were acquired at the iThemba Laboratory for Accelerator Based Sciences (iThemba LABS). The experimental scales extracted from these data are compared to different theoretical approaches performed in the framework of quasiparticle random phase approximation (QRPA) and beyond-QRPA including complex configurations using both non-relativistic and relativistic density functional theory. The role of Landau fragmentation was highlighted while the inclusion of coupling between one particle-one hole (1p-1h) and two particle-two hole (2p-2h) configurations modify the strength distributions and wavelet scales indicating the importance of the spreading width.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1059 ","pages":"Article 123078"},"PeriodicalIF":1.7,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143768633","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