Nuclear Physics A最新文献

{"title":"Relation between degrees of collectivity and repetition patterns of quadrupole transition probabilities in the candidates of shape coexistence","authors":"Asgar Hosseinnezhad, Hadi Sabri","doi":"10.1016/j.nuclphysa.2023.122813","DOIUrl":"10.1016/j.nuclphysa.2023.122813","url":null,"abstract":"<div><p><span>In this article, we study the possible relationship between degrees of freedom of collectivity in protons and neutrons' last orbitals and different patterns of quadrupole<span><span> transition possibilities in the shape coexistence candidates. Because of the dependence of shape coexistence on the arrangement of nucleons in the </span>nuclear structure, we classified the candidates of shape coexistence based on neutrons and protons' last orbitals using the shell-model configuration. In the orbitals corresponding to the neutron numbers in the N=40, 60, and 90 regions, there is a limitation in the degree of freedom for neutrons, and proton-induced shape coexistence occurs. Also, for the orbitals corresponding to the atomic numbers of the Z=40, 52, and 82 regions, the degree of freedom is limited for protons, and neutron-induced coexistence occurs. In this article, we study both the nuclei that belong to the neutron and proton-induced shape coexistence categories and the nuclei that are candidates for shape coexistence but do not belong to the mentioned two categories. The study of different patterns indicates that the </span></span><span><math><mfrac><mrow><mrow><mo>|</mo></mrow><mrow><mi>B</mi><mrow><mo>(</mo><mrow><mi>E</mi><mn>2</mn><mo>;</mo><msubsup><mn>2</mn><mn>2</mn><mo>+</mo></msubsup><mo>→</mo><msubsup><mn>0</mn><mn>1</mn><mo>+</mo></msubsup></mrow><mo>)</mo></mrow><mo>−</mo><mi>B</mi><mrow><mo>(</mo><mrow><mi>E</mi><mn>2</mn><mo>;</mo><msubsup><mn>2</mn><mn>1</mn><mo>+</mo></msubsup><mo>→</mo><msubsup><mn>0</mn><mn>1</mn><mo>+</mo></msubsup></mrow><mo>)</mo></mrow><mspace></mspace></mrow><mrow><mo>|</mo></mrow></mrow><mrow><mi>B</mi><mo>(</mo><mrow><mi>E</mi><mn>2</mn><mo>;</mo><msubsup><mn>2</mn><mn>1</mn><mo>+</mo></msubsup><mo>→</mo><msubsup><mn>0</mn><mn>1</mn><mo>+</mo></msubsup></mrow><mo>)</mo></mrow></mfrac></math></span>, <span><math><mfrac><mrow><mrow><mo>|</mo></mrow><mrow><mi>B</mi><mrow><mo>(</mo><mrow><mi>E</mi><mn>2</mn><mo>;</mo><msubsup><mn>2</mn><mn>2</mn><mo>+</mo></msubsup><mo>→</mo><msubsup><mn>0</mn><mn>1</mn><mo>+</mo></msubsup></mrow><mo>)</mo></mrow><mo>−</mo><mi>B</mi><mrow><mo>(</mo><mrow><mi>E</mi><mn>2</mn><mo>;</mo><msubsup><mn>4</mn><mn>1</mn><mo>+</mo></msubsup><mo>→</mo><msubsup><mn>2</mn><mn>1</mn><mo>+</mo></msubsup></mrow><mo>)</mo></mrow><mspace></mspace></mrow><mrow><mo>|</mo></mrow></mrow><mrow><mi>B</mi><mo>(</mo><mrow><mi>E</mi><mn>2</mn><mo>;</mo><msubsup><mn>4</mn><mn>1</mn><mo>+</mo></msubsup><mo>→</mo><msubsup><mn>2</mn><mn>1</mn><mo>+</mo></msubsup></mrow><mo>)</mo></mrow></mfrac></math></span>, <span><math><mfrac><mrow><mrow><mo>|</mo></mrow><mrow><mi>B</mi><mrow><mo>(</mo><mrow><mi>E</mi><mn>2</mn><mo>;</mo><msubsup><mn>2</mn><mn>2</mn><mo>+</mo></msubsup><mo>→</mo><msubsup><mn>0</mn><mn>1</mn><mo>+</mo></msubsup></mrow><mo>)</mo></mrow><mo>−</mo><mi>B</mi><mrow><mo>(</mo><mrow><mi>E</mi><mn>2</mn><mo>;</mo><msubsup><mn>6</mn><mn>1</mn><mo>+</mo></msubsup><mo>→</mo><msubsup><m","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1042 ","pages":"Article 122813"},"PeriodicalIF":1.4,"publicationDate":"2023-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138608169","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}

{"title":"Corrigendum to “Peripheral reactions and elastic scattering induced by strongly bound, weakly bound and exotic nuclei” [Nuclear Physics A 1041 (2024) 1–18 122785]","authors":"J.E. Testoni, D. Abriola, G.V. Martí","doi":"10.1016/j.nuclphysa.2023.122804","DOIUrl":"https://doi.org/10.1016/j.nuclphysa.2023.122804","url":null,"abstract":"","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1042 ","pages":"Article 122804"},"PeriodicalIF":1.4,"publicationDate":"2023-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0375947423002087/pdfft?md5=a28c0a50b7e3781567159cec2c8ec42a&pid=1-s2.0-S0375947423002087-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138558916","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Imaging constituent quark shape of proton with exclusive vector meson production at HERA","authors":"Wenchang Xiang , Yanbing Cai , Daicui Zhou","doi":"10.1016/j.nuclphysa.2023.122810","DOIUrl":"10.1016/j.nuclphysa.2023.122810","url":null,"abstract":"<div><p><span><span>We show within proton hot spot picture that the exclusive vector meson production in electron-proton deeply </span>inelastic scattering is sensitive to the individual width of the constituent quarks of the proton. For comparison, we calculate the exclusive </span><span><math><mi>J</mi><mo>/</mo><mi>Ψ</mi></math></span> production cross-sections in three cases, <span><math><msub><mrow><mi>B</mi></mrow><mrow><mi>u</mi></mrow></msub><mo>≥</mo><msub><mrow><mi>B</mi></mrow><mrow><mi>d</mi></mrow></msub></math></span>, <span><math><msub><mrow><mi>B</mi></mrow><mrow><mi>u</mi></mrow></msub><mo><</mo><msub><mrow><mi>B</mi></mrow><mrow><mi>d</mi></mrow></msub></math></span> and <span><math><msub><mrow><mi>B</mi></mrow><mrow><mi>u</mi></mrow></msub><mo>≠</mo><msubsup><mrow><mi>B</mi></mrow><mrow><mi>u</mi></mrow><mrow><mo>′</mo></mrow></msubsup><mo>≠</mo><msub><mrow><mi>B</mi></mrow><mrow><mi>d</mi></mrow></msub></math></span>, where the <span><math><msub><mrow><mi>B</mi></mrow><mrow><mi>u</mi></mrow></msub></math></span>, <span><math><msubsup><mrow><mi>B</mi></mrow><mrow><mi>u</mi></mrow><mrow><mo>′</mo></mrow></msubsup></math></span> and <span><math><msub><mrow><mi>B</mi></mrow><mrow><mi>d</mi></mrow></msub></math></span> denote the widths of two up quarks and a down quark. We find that only results calculated with <span><math><msub><mrow><mi>B</mi></mrow><mrow><mi>u</mi></mrow></msub><mo>≥</mo><msub><mrow><mi>B</mi></mrow><mrow><mi>d</mi></mrow></msub></math></span> can give a reasonable description of the exclusive <span><math><mi>J</mi><mo>/</mo><mi>Ψ</mi></math></span><span> production cross-section data at HERA. To test that our results are independent of the details of the model, we retain the average width of the three constituent quarks unchanged and compute the exclusive </span><span><math><mi>J</mi><mo>/</mo><mi>Ψ</mi></math></span> production cross-sections with contribution weight by setting different proportional coefficients (<span><math><msub><mrow><mi>W</mi></mrow><mrow><mi>u</mi></mrow></msub></math></span> and <span><math><msub><mrow><mi>W</mi></mrow><mrow><mi>d</mi></mrow></msub></math></span>) for the up and down quarks, respectively. It shows that the results calculated with <span><math><msub><mrow><mi>W</mi></mrow><mrow><mi>u</mi></mrow></msub><mo>≥</mo><msub><mrow><mi>W</mi></mrow><mrow><mi>d</mi></mrow></msub></math></span> can well reproduce the exclusive <span><math><mi>J</mi><mo>/</mo><mi>Ψ</mi></math></span><span> production data at HERA, while the opposite case cannot describe the HERA data. These interesting findings seem to indicate that the up quark has more gluons around it than the down quark at high energy although the spatial distribution of gluons fluctuates event-by-event. To ensure the relevant results independent of the species of the vector meson, we also calculate the </span><em>ρ</em> production cross-sections with the same group of parameters used in the exclusive <span><math><mi>J</mi><m","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1042 ","pages":"Article 122810"},"PeriodicalIF":1.4,"publicationDate":"2023-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138534002","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}

{"title":"Description of intruder levels in the 162,164,166Dy nuclei by two different algebraic approaches","authors":"Z. Jahangiri tazekand,&nbsp;H. Sabri","doi":"10.1016/j.nuclphysa.2023.122811","DOIUrl":"10.1016/j.nuclphysa.2023.122811","url":null,"abstract":"<div><p>In this paper, we tried to describe both normal and intruder levels of the ground and first excited beta and gamma rotational bands of ^162,164,166<span><span>Dy deformed nuclei in the framework of the interacting boson model. A normal Hamiltonian of SU(3) dynamical symmetry limit is extended by adding a 2p-2 h excitation term. Also, the results are compared with the predictions of the partial dynamical symmetry for these levels of considered nuclei. The results show that, this extension removes the degeneracy suggested by the pure SU(3) symmetry and makes satisfactory agreement with the experimental counterparts for the energy levels, too. Also, a comparison between the results of this extended formalism and partial dynamical symmetry shows the advantages of the first one in the description of intruder levels, whereas the latter, makes exact results for the normal energy levels of beta and gamma energy bands. The predictions of pure SU(3), partial dynamical symmetry SU(3) and mixed formalism for different </span>quadrupole transition rates between normal and intruder levels of this nucleus are compared with the predictions of pseudo-SU(3) model and the advantages of each model have explained in detail.</span></p></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1042 ","pages":"Article 122811"},"PeriodicalIF":1.4,"publicationDate":"2023-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138552374","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}

{"title":"Tensor and isovector–isoscalar terms of relativistic mean field model: Impacts on neutron-skin thickness, charge radius, and nuclear matter","authors":"N. Liliani ,&nbsp;A.M. Nugraha ,&nbsp;J.P. Diningrum ,&nbsp;A. Sulaksono","doi":"10.1016/j.nuclphysa.2023.122812","DOIUrl":"10.1016/j.nuclphysa.2023.122812","url":null,"abstract":"<div><p>The origin of the neutron skin thickness, measured by the CREX and PREX collaborations as thin for ⁴⁰Ca and thick for ²⁸<span>Pb, remains a mystery. We investigate the effects of tensor and nonlinear isovector–isoscalar terms in a relativistic mean-field model (RMF) on the properties of finite nuclei and nuclear matter. Tensor couplings are crucial for better quality binding energies of finite nuclei and charge radii for relatively heavy nuclei. However, for light nuclei, the tensor terms cannot improve the compatibility of charge radius predictions by the RMF model with experimental data. We find that parameter sets with a larger nonlinear isovector–isoscalar parameter, particularly </span><span><math><msub><mrow><mi>η</mi></mrow><mrow><mn>2</mn><mi>ρ</mi></mrow></msub></math></span> = 0.028, agree better with experimental data for Δ<span><math><msub><mrow><mi>r</mi></mrow><mrow><mi>n</mi><mi>p</mi></mrow></msub></math></span> across light, medium, and heavy isotope chains. Using PT28, we calculate Δ<span><math><msub><mrow><mi>r</mi></mrow><mrow><mi>n</mi><mi>p</mi></mrow></msub></math></span> for ²⁰⁸Pb as 0.214 fm, <em>J</em> as 33.078, and <em>L</em> as 58.426. Δ<span><math><msub><mrow><mi>r</mi></mrow><mrow><mi>n</mi><mi>p</mi></mrow></msub></math></span> for ²⁰⁸Pb obtained using PT28 is consistent with the PREX-II data. Moreover, the corresponding values of <em>J</em> and <em>L</em> agree with the low <em>L</em> constraints. Meanwhile, the canonical mass radius predicted by PT28 aligns with the mass and radius data from the NICER collaboration. The combination of tensor and nonlinear isovector–isoscalar couplings in the RMF model provides accurate predictions for finite nuclei binding energies and relatively heavy nuclei charge radii, resulting in relatively thick Δ<span><math><msub><mrow><mi>r</mi></mrow><mrow><mi>n</mi><mi>p</mi></mrow></msub></math></span> values for ²⁰⁸Pb without substantial <em>L</em> values.</p></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1042 ","pages":"Article 122812"},"PeriodicalIF":1.4,"publicationDate":"2023-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138534019","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}

{"title":"Comprehension of breakup fusion reactions using forward recoil range distribution measurements","authors":"Suhail A. Tali ,&nbsp;Harish Kumar ,&nbsp;M. Afzal Ansari ,&nbsp;D. Singh ,&nbsp;Rahbar Ali ,&nbsp;Pankaj K. Giri ,&nbsp;Sneha B. Linda ,&nbsp;Amritraj Mahato ,&nbsp;Nabendu Kumar Deb ,&nbsp;R. Kumar ,&nbsp;R.N. Ali","doi":"10.1016/j.nuclphysa.2023.122809","DOIUrl":"10.1016/j.nuclphysa.2023.122809","url":null,"abstract":"<div><p>To understand the break-up fusion reaction dynamics, the forward recoil range distribution (FRRD) measurements of ¹²C + ¹⁶⁵Ho system at the incident projectile energy of ≈ 88 MeV has been performed. The recoil catcher activation technique followed by the off-line gamma ray spectroscopy was implemented. It is observed that the FRRD measurements of the evaporation residues (ERs) populated via xn and pxn channels have a single Guassian peak at large cumulative thickness. This is attributed to complete momentum transfer from the projectile to the target nucleus. However, in case of the FRRD measurements of the ERs populated via αxn, αpxn and 2αxn emitting channels, in addition to peak corresponding to complete momentum transfer, the Gaussian peaks at lower cumulative thicknesses are also observed. This is accredited to the breakup fusion. Moreover, the effect of projectile breakup on complete fusion cross section is also studied. The suppression in fusion cross section is observed when compared with the universal fusion function, thus indicating the breakup probability of ¹²C projectile.</p></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1042 ","pages":"Article 122809"},"PeriodicalIF":1.4,"publicationDate":"2023-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138534001","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}

{"title":"Large-scale shell-model study of two-neutrino double beta decay of 82Se, 94Zr, 108Cd, 124Sn, 128Te, 130Te, 136Xe, and 150Nd","authors":"Deepak Patel ,&nbsp;Praveen C. Srivastava ,&nbsp;V.K.B. Kota ,&nbsp;R. Sahu","doi":"10.1016/j.nuclphysa.2023.122808","DOIUrl":"https://doi.org/10.1016/j.nuclphysa.2023.122808","url":null,"abstract":"<div><p>Large-scale shell-model calculations have been performed for the study of two-neutrino double-beta (<span><math><mn>2</mn><mi>ν</mi><mi>β</mi><mi>β</mi></math></span>) decay in ⁸²Se, ⁹⁴Zr, ¹⁰⁸Cd, ¹²⁴Sn, ¹²⁸Te, ¹³⁰Te, ¹³⁶Xe, and ¹⁵⁰Nd. We have employed JUN45 interaction to calculate the nuclear matrix element (NME) for <span><math><mn>2</mn><mi>ν</mi><mi>β</mi><mi>β</mi></math></span> decay in ⁸²Se. In the case of ⁹⁴Zr, the glekpn effective interaction is used. For ¹⁰⁸Cd, we have used a realistic effective interaction derived through the G-matrix approach. In the case of ¹²⁴Sn, ^128,130Te and ¹³⁶Xe, the sn100pn effective interaction is employed. For ¹⁵⁰Nd, we have used KHHE effective interaction based on holes in a ²⁰⁸Pb core. We have extracted the half-lives of these nuclei for the <span><math><mn>2</mn><mi>ν</mi><mi>β</mi><mi>β</mi></math></span> decay with the help of calculated NME. Our results are consistent with the available experimental half-lives. The variation of cumulative <span><math><mn>2</mn><mi>ν</mi><mi>β</mi><mi>β</mi></math></span> NME with respect to the excitation energy of the intermediate <span><math><msup><mrow><mn>1</mn></mrow><mrow><mo>+</mo></mrow></msup></math></span> states is also shown, and in all cases, it is ensured that their values are almost saturated. In the present work we have calculated more intermediate <span><math><msup><mrow><mn>1</mn></mrow><mrow><mo>+</mo></mrow></msup></math></span> states as much as possible in comparison to results available in the literature.</p></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1042 ","pages":"Article 122808"},"PeriodicalIF":1.4,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138484122","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}

{"title":"TOTEM-ATLAS ambiguity: Shouldn't one worry?","authors":"Vladimir A. Petrov,&nbsp;Nikolai P. Tkachenko","doi":"10.1016/j.nuclphysa.2023.122807","DOIUrl":"10.1016/j.nuclphysa.2023.122807","url":null,"abstract":"<div><p>The values of the parameters <span><math><msup><mrow><mi>ρ</mi></mrow><mrow><mi>p</mi><mi>p</mi></mrow></msup><mo>,</mo><msubsup><mrow><mi>σ</mi></mrow><mrow><mtext>tot</mtext></mrow><mrow><mi>p</mi><mi>p</mi></mrow></msubsup></math></span> and <span><math><msup><mrow><mi>B</mi></mrow><mrow><mi>p</mi><mi>p</mi></mrow></msup></math></span> extracted in the region of Coulomb-nuclear interference (CNI) in the ATLAS and TOTEM experiments at energy <span><math><msqrt><mrow><mi>s</mi></mrow></msqrt><mo>=</mo><mn>13</mn></math></span> TeV are studied based on the general expression for the Coulomb-nuclear amplitude. Due to the significant differences between these data, we undertake both their joint analysis and the retrieval of parameter values separately for each experiment. A significant incompatibility of these parameters published by the ATLAS and TOTEM experiments is shown. This is especially noticeable in the case of <span><math><msub><mrow><mi>σ</mi></mrow><mrow><mtext>tot</mtext></mrow></msub></math></span> and the situation is similar to what once happened at the TEVATRON: the values of <span><math><msubsup><mrow><mi>σ</mi></mrow><mrow><mtext>tot</mtext></mrow><mrow><mi>A</mi><mi>T</mi><mi>L</mi><mi>A</mi><mi>S</mi></mrow></msubsup></math></span> with account of errors do not overlap with <span><math><msubsup><mrow><mi>σ</mi></mrow><mrow><mtext>tot</mtext></mrow><mrow><mi>T</mi><mi>O</mi><mi>T</mi><mi>E</mi><mi>M</mi></mrow></msubsup></math></span>.</p></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1042 ","pages":"Article 122807"},"PeriodicalIF":1.4,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138534018","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}

{"title":"Lifetime measurement of the Ex = 2485.3 keV level of 25Al populated through 24Mg(p,γ)25Al resonance reaction","authors":"Arkabrata Gupta ,&nbsp;Sathi Sharma ,&nbsp;Sangeeta Das ,&nbsp;Anik Adhikari ,&nbsp;Anubhab Mondal ,&nbsp;Madhusree Roy Chowdhury ,&nbsp;Chandan D Bagdia ,&nbsp;Lokesh Tribedi ,&nbsp;Vandana Nanal ,&nbsp;Abhijit Bisoi ,&nbsp;M. Saha Sarkar ,&nbsp;S. Sarkar","doi":"10.1016/j.nuclphysa.2023.122806","DOIUrl":"https://doi.org/10.1016/j.nuclphysa.2023.122806","url":null,"abstract":"<div><p>Results of our experimental study of the ²⁴Mg<span><math><msup><mrow><mo>(</mo><mi>p</mi><mo>,</mo><mi>γ</mi><mo>)</mo></mrow><mrow><mn>25</mn></mrow></msup></math></span>Al resonance reaction at E<span><math><mmultiscripts><mrow><mo>=</mo></mrow><mprescripts></mprescripts><mrow><mi>p</mi></mrow><mrow><mi>l</mi><mi>a</mi><mi>b</mi></mrow></mmultiscripts><mn>223</mn></math></span><span> keV are presented. The proton beam energy is varied from 220 to 265 keV. An evaporated Mg target with thick Ta backing is used. We remeasure a mean lifetime of </span><span><math><mi>τ</mi><mo>=</mo><msubsup><mrow><mn>6.04</mn></mrow><mrow><mo>−</mo><mn>2.65</mn></mrow><mrow><mo>+</mo><mn>3.03</mn></mrow></msubsup></math></span> fs for the E<span><math><mmultiscripts><mrow><mo>=</mo></mrow><mprescripts></mprescripts><mrow><mi>x</mi></mrow><none></none></mmultiscripts><mn>2485.3</mn></math></span> keV level of ²⁵<span>Al, using Doppler shift attenuation (DSA) method. Three most successfully used empirical effective interactions developed for the sd shell by Wildenthal (w), Chung-Wildenthal (cw) and Preedom-Wildenthal (pw), are utilized to calculate energy spectra<span>, spectroscopic factors, beta decay properties, transition probabilities and the lifetime of the resonance state in </span></span>²⁵Al within the framework of nuclear shell model. The theoretical results agree reasonably well with the experimental data. However, a detailed study for each set to identify the most preferred interaction for this nucleus is performed. Calculated lifetimes using two of the interactions (w, cw) agree better with the central value of the experimental lifetime of the resonance state measured in the present work.</p></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1042 ","pages":"Article 122806"},"PeriodicalIF":1.4,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138473943","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}

{"title":"Measurement of fast neutron induced (n,γ) reaction cross-section of 152Sm, 154Sm and 150Nd in the energy range of 0.8 to 2 MeV","authors":"N.S. Tawade ,&nbsp;R. Tripathi ,&nbsp;T.N. Nag ,&nbsp;S. Patra ,&nbsp;C.S. Datrik ,&nbsp;P.K. Pujari ,&nbsp;R.G. Thomas ,&nbsp;G. Mishra ,&nbsp;A. Kumar ,&nbsp;S. De ,&nbsp;H. Kumawat","doi":"10.1016/j.nuclphysa.2023.122805","DOIUrl":"10.1016/j.nuclphysa.2023.122805","url":null,"abstract":"<div><p>The (n,γ) reaction cross-section of rare earth stable fission products, such as ¹⁵²Sm, ¹⁵⁴Sm and ¹⁵⁰Nd, in the neutron energy range of 0.8 to 2 MeV, obtained from ⁷Li(p,n)⁷Be reaction, was measured by neutron activation followed by off-line gamma-ray spectrometry. Natural strontium (^nat<span>Sr) has been established as a fast neutron flux monitor in this work, by measuring the </span>^natSr(n,γ+<em>n</em>,n′)⁸⁷Sr^m reaction cross-section using ¹²⁷I(n,γ)¹²⁸I as monitor reaction. The cross-section for ⁸⁶Sr(n,γ)⁸⁷Sr^m has been determined for the first time to the best of our knowledge. The excellent decay properties of ⁸⁷Sr^m and opposite energy dependence of ⁸⁶Sr(n,γ)⁸⁷Sr^m and ⁸⁷Sr(n,n′)⁸⁷Sr^m reactions makes ^natSr an excellent candidate for neutron flux monitor for wide neutron energy range. The measured (n,γ) cross-section data from the present study has been compared with the literature data, which is very limited along with large scatter in the energy range of 1–2 MeV for these nuclei. The results from the present study, clearly show a need for fresh cross-section evaluations for ¹⁵²Sm(n,γ)¹⁵³Sm. For, ¹⁵⁴Sm(n,γ)¹⁵⁵Sm and ¹⁵⁰Nd(n,γ)¹⁵¹<span><span>Nd reactions, the present data align with one of the data groups among the two which can be broadly identified having difference of about more than ∼50%. The present experimental data has been compared with TALYS 1.96 theoretical model calculations based on Fermi gas level density prescriptions which shows that the cross section values are close to the experimental data at some of the neutron energies. A comparison of the data on </span>fast neutron capture cross-section for </span><em>N</em> = 90 isotones from the present study and from the literature showed a systematic decrease in the cross-section value with increasing neutron richness of the target nucleus. The cross-section data could be scaled with neutron-proton asymmetry parameter to show a nearly linear behaviour on a logarithmic scale. The data for ¹⁵⁴Sm (<em>N</em> = 92) was also observed to follow the same trend.</p></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1042 ","pages":"Article 122805"},"PeriodicalIF":1.4,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138534000","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}