Nuclear Physics A最新文献

{"title":"A modified macroscopic-microscopic nuclear mass formula within considering isospin effect and continuum states","authors":"Hai Fei Zhang","doi":"10.1016/j.nuclphysa.2024.122913","DOIUrl":"https://doi.org/10.1016/j.nuclphysa.2024.122913","url":null,"abstract":"<div><p>The coefficients of modified macroscopic-microscopic mass formula have been adjusted on 2267 experimental atomic masses extracted from the AME2012 atomic mass evaluation. Same as the Weizsäcker-Skyrme model the influence of the nuclear deformation on the macroscopic energy and the mirror nuclei constraint are also taken into account, and for the sake of the consistency of the model parameters between the macroscopic and the microscopic parts we approximate the isospin-dependent component of the macroscopic energy to the depth of the Woods-Saxon potential. Inspired by Kruppa prescription the continuum states are considered in the calculation of shell correction. Then the root-mean square (rms) deviation with respect to 2267 measured nuclear masses is 0.46 MeV. We predict the remaining 988 nuclei from the AME2012 with <span><math><mi>Z</mi><mo>,</mo><mi>N</mi><mo>&gt;</mo><mn>7</mn></math></span> for which the mass is still unknown or known with a higher uncertainty. In addition the <em>α</em>−decay energies of seven chains in the superheavy nuclei region with <span><math><mi>Z</mi><mo>=</mo><mn>117</mn><mo>,</mo><mn>118</mn></math></span> are evaluated.</p></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1049 ","pages":"Article 122913"},"PeriodicalIF":1.4,"publicationDate":"2024-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141323075","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":"Study on the reaction channels in the 6Li+89Y system with multi-angular proton and deutron-γ coincidence analysis","authors":"M.L. Wang ,&nbsp;G.X. Zhang ,&nbsp;S.P. Hu ,&nbsp;G.L. Zhang ,&nbsp;H.Q. Zhang ,&nbsp;H.B. Sun ,&nbsp;D. Testov ,&nbsp;P.R. John ,&nbsp;J.J. Valiente-Dobón ,&nbsp;A. Goasduff ,&nbsp;M. Siciliano ,&nbsp;F. Galtarossa ,&nbsp;F. Recchia ,&nbsp;D. Mengoni ,&nbsp;D. Bazzacco","doi":"10.1016/j.nuclphysa.2024.122914","DOIUrl":"10.1016/j.nuclphysa.2024.122914","url":null,"abstract":"<div><p>The ⁶Li+⁸⁹Y experiment was conducted at the Legnaro National Laboratory in Italy to explore the influence of breakup and transfer reactions on the fusion process induced by the weakly bound projectiles. Due to the competition between neutron and proton evaporation, complete and incomplete fusion might produce identical residues, leading to the difficulties in identification of different reaction process. In this work, the High-Purity-Germanium (HPGe) detector array (GALILEO) was employed to measure <em>γ</em> rays, and the silicon detector array (EUCLIDES) was utilized to capture light charged particles. Exclusive measurements of prompt <em>γ</em> rays from residuals with various light charged particles at an energy near the Coulomb barrier are reported. In the <span><math><mi>p</mi><mo>−</mo><mi>γ</mi></math></span> coincident measurements, observed ⁹¹Nb, ⁹²Nb, and ⁹³Nb is considered from neutron evaporation channel in complete fusion reaction, and ⁹⁰Y is generated through 1n stripping reaction. A two-step, breakup followed by fusion, in case of the capture of <em>α</em> is inferred to be the dominant mechanism to yield the ⁹²Nb and ⁹¹Nb in the deutron coincident exclusive measurement.</p></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1049 ","pages":"Article 122914"},"PeriodicalIF":1.4,"publicationDate":"2024-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141398630","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":"The Gamow and the Fermi Golden Rules","authors":"Rafael de la Madrid","doi":"10.1016/j.nuclphysa.2024.122904","DOIUrl":"https://doi.org/10.1016/j.nuclphysa.2024.122904","url":null,"abstract":"<div><p>By using the fact that the Gamow states in the momentum representation are square integrable, we obtain the differential and the total decay width of a two-body, non-relativistic decay. The resulting Gamow Golden Rule is well suited to describe both energy and angular decay distributions, and it becomes the Fermi Golden Rule when the resonance is long-lived and far from the energy threshold. We also show that the correct density of states and phase space factors arise naturally from the Gamow Golden Rule. The upshot is that the Gamow states and the Golden Rule can be combined into a unified description of quantum resonances.</p></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1049 ","pages":"Article 122904"},"PeriodicalIF":1.4,"publicationDate":"2024-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141294430","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":"Hamiltonian formalism for Bose excitations in a plasma with a non-Abelian interaction I: Plasmon – hard particle scattering","authors":"Yu.A. Markov,&nbsp;M.A. Markova,&nbsp;N.Yu. Markov","doi":"10.1016/j.nuclphysa.2024.122903","DOIUrl":"https://doi.org/10.1016/j.nuclphysa.2024.122903","url":null,"abstract":"<div><p>Hamiltonian theory for collective longitudinally polarized gluon excitations (plasmons) interacting with classical high-energy test color-charged particle propagating through a high-temperature gluon plasma is developed. A generalization of the Lie-Poisson bracket to the case of a continuous medium involving bosonic normal field variable <span><math><msubsup><mrow><mi>a</mi></mrow><mrow><mspace></mspace><mi>k</mi></mrow><mrow><mphantom><mo>⁎</mo></mphantom><mi>a</mi></mrow></msubsup></math></span> and a non-Abelian color charge <span><math><msup><mrow><mi>Q</mi></mrow><mrow><mspace></mspace><mi>a</mi></mrow></msup></math></span> is performed and the corresponding Hamilton equations are presented. The canonical transformations including simultaneously both bosonic degrees of freedom of the soft collective excitations and degree of freedom of hard test particle connecting with its color charge in the hot gluon plasma are written out. A complete system of the canonicity conditions for these transformations is derived. The notion of the plasmon number density <span><math><msubsup><mrow><mi>N</mi></mrow><mrow><mspace></mspace><mi>k</mi></mrow><mrow><mspace></mspace><mi>a</mi><mspace></mspace><msubsup><mrow><mi>a</mi></mrow><mrow><mphantom><mn>1</mn></mphantom></mrow><mrow><mo>′</mo></mrow></msubsup></mrow></msubsup></math></span>, which is a nontrivial matrix in the color space, is introduced. An explicit form of the effective fourth-order Hamiltonian describing the elastic scattering of a plasmon off a hard color particle is found and the self-consistent system of Boltzmann-type kinetic equations taking into account the time evolution of the mean value of the color charge of the hard particle is obtained. On the basis of these equations, a model problem of the interaction of two infinitely narrow wave packets is considered. A system of nonlinear first-order ordinary differential equations defining the dynamics of the interaction of the colorless <span><math><msubsup><mrow><mi>N</mi></mrow><mrow><mi>k</mi></mrow><mrow><mspace></mspace><mi>l</mi></mrow></msubsup></math></span> and color <span><math><msubsup><mrow><mi>W</mi></mrow><mrow><mi>k</mi></mrow><mrow><mspace></mspace><mi>l</mi></mrow></msubsup></math></span> components of the plasmon number density is derived. The problem of determining the third- and fourth-order coefficient functions entering into the canonical transformations of the original bosonic variable <span><math><msubsup><mrow><mi>a</mi></mrow><mrow><mspace></mspace><mi>k</mi></mrow><mrow><mphantom><mo>⁎</mo></mphantom><mi>a</mi></mrow></msubsup></math></span> and color charge <span><math><msup><mrow><mi>Q</mi></mrow><mrow><mspace></mspace><mi>a</mi></mrow></msup></math></span> is discussed. With the help of the coefficient functions obtained, a complete effective amplitude of the elastic scattering of plasmon off hard test particle is written out.</p></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1048 ","pages":"Article 122903"},"PeriodicalIF":1.4,"publicationDate":"2024-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141243709","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":"Assignment of charmed-strange Ds0(2590)+ and DsJ(3040)+","authors":"Zi-Han Jiang,&nbsp;Ailin Zhang","doi":"10.1016/j.nuclphysa.2024.122893","DOIUrl":"10.1016/j.nuclphysa.2024.122893","url":null,"abstract":"&lt;div&gt;&lt;p&gt;Based on analyses of the mass and the strong decay features, &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;D&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;s&lt;/mi&gt;&lt;mn&gt;0&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;msup&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mn&gt;2590&lt;/mn&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mo&gt;+&lt;/mo&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;/math&gt;&lt;/span&gt; observed by LHCb collaboration is identified as a radial excitation of the pseudoscalar &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;D&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;s&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt;, and &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;D&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;s&lt;/mi&gt;&lt;mi&gt;J&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;msup&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mn&gt;3040&lt;/mn&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mo&gt;+&lt;/mo&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;/math&gt;&lt;/span&gt; observed by BaBar collaboration is identified as a radial excitation of &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;D&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;s&lt;/mi&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;msup&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mn&gt;2536&lt;/mn&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mo&gt;±&lt;/mo&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;/math&gt;&lt;/span&gt;. &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;D&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;s&lt;/mi&gt;&lt;mn&gt;0&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;msup&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mn&gt;2590&lt;/mn&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mo&gt;+&lt;/mo&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;/math&gt;&lt;/span&gt; is possibly a pure &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;D&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;s&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;mspace&gt;&lt;/mspace&gt;&lt;mmultiscripts&gt;&lt;mrow&gt;&lt;mi&gt;S&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;0&lt;/mn&gt;&lt;/mrow&gt;&lt;none&gt;&lt;/none&gt;&lt;mprescripts&gt;&lt;/mprescripts&gt;&lt;none&gt;&lt;/none&gt;&lt;mrow&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;/mrow&gt;&lt;/mmultiscripts&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/math&gt;&lt;/span&gt; meson, both basic &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;D&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;s&lt;/mi&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;msup&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mn&gt;2536&lt;/mn&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mo&gt;±&lt;/mo&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;/math&gt;&lt;/span&gt; and radially excited &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;D&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;s&lt;/mi&gt;&lt;mi&gt;J&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;msup&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mn&gt;3040&lt;/mn&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mo&gt;+&lt;/mo&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;/math&gt;&lt;/span&gt; are possibly the mixtures &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;D&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;s&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;n&lt;/mi&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;P&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/math&gt;&lt;/span&gt; between spin triplet &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;D&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;s&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;n&lt;/mi&gt;&lt;mspace&gt;&lt;/mspace&gt;&lt;mmultiscripts&gt;&lt;mrow&gt;&lt;mi&gt;P&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;/mrow&gt;&lt;none&gt;&lt;/none&gt;&lt;mprescripts&gt;&lt;/mprescripts&gt;&lt;none&gt;&lt;/none&gt;&lt;mrow&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;/mrow&gt;&lt;/mmultiscripts&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/math&gt;&lt;/span&gt; and spin singlet &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;D&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;s&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mi&gt;n&lt;/mi&gt;&lt;mspace&gt;&lt;/mspace&gt;&lt;mmultiscripts&gt;&lt;mrow&gt;&lt;mi&gt;P&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;/mrow&gt;&lt;none&gt;&lt;/none&gt;&lt;mprescripts&gt;&lt;/mprescripts&gt;&lt;none&gt;&lt;/none&gt;&lt;mrow&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;/mrow&gt;&lt;/mmultiscripts&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/math&gt;&lt;/span&gt;. In this arrangement, their masses meet the linear behavior of the radial Regge trajectory very well. In the &lt;span&gt;&lt;math&gt;&lt;mmultiscripts&gt;&lt;mrow&gt;&lt;mi&gt;P&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;0&lt;/mn&gt;&lt;/mrow&gt;&lt;none&gt;&lt;/none&gt;&lt;mprescripts&gt;&lt;/mprescripts&gt;&lt;none&gt;&lt;/none&gt;&lt;mrow&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;/mrow&gt;&lt;/mmultiscripts&gt;&lt;/math&gt;&lt;/span&gt; strong decay model, the decay channels of &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;D&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;s&lt;/mi&gt;&lt;mn&gt;0&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;msup&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mn&gt;2590&lt;/mn&gt;&lt;mo&gt;)&lt;/mo","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1048 ","pages":"Article 122893"},"PeriodicalIF":1.4,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141025434","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":"Study of binary fragmentation dynamics of 260Rf compound nucleus at an excitation energy of 85.7 MeV","authors":"Amit ,&nbsp;Chetan Sharma ,&nbsp;Shruti ,&nbsp;Raghav ,&nbsp;Subodh ,&nbsp;Amninderjeet Kaur ,&nbsp;P. Sugathan ,&nbsp;A. Jhingan ,&nbsp;N. Saneesh ,&nbsp;K.S. Golda ,&nbsp;Mohit Kumar ,&nbsp;D. Arora ,&nbsp;Vikas ,&nbsp;Neeraj Kumar ,&nbsp;B.R. Behera ,&nbsp;H.J. Wollersheim ,&nbsp;J. Gerl","doi":"10.1016/j.nuclphysa.2024.122892","DOIUrl":"https://doi.org/10.1016/j.nuclphysa.2024.122892","url":null,"abstract":"<div><p>The fission dynamics has been studied for a near super heavy compound nucleus ²⁶⁰Rf populated through ²⁸Si + ²³²Th reaction at an excitation energy of 85.7 MeV. Full momentum transfer binary events were separated from the transfer induced fission events. The contribution from transfer induced fission has been found to be <span><math><mn>7</mn><mo>±</mo><mn>2</mn><mtext>%</mtext></math></span>. Mas ratio distribution, mass-total kinetic energy (TKE), and mass angle correlation have been extracted for the full momentum transfer events using two body kinematics. The experimentally extracted width of mass distribution is higher than the mass width calculated theoretically using the saddle-point model, which indicates the presence of non-compound nuclear fission in the reaction under study. The mass-TKE distribution obtained for ²⁶⁰Rf nucleus matches with the theoretical predictions from the Viola systematics and GEneral description of Fission observables (GEF) model. The mass-angle distribution for the reaction under study indicates no significant correlation between the mass and emission angles of the fission fragments.</p></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1048 ","pages":"Article 122892"},"PeriodicalIF":1.4,"publicationDate":"2024-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140950614","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":"Study of C12(γ→,p)11B reactions with polarized photons at energy 40-65 MeV","authors":"D.D. Burdeinyi ,&nbsp;V.B. Ganenko ,&nbsp;J.R.M. Annand ,&nbsp;R. Al Jebali ,&nbsp;K. Hansen ,&nbsp;K. Fissum ,&nbsp;J. Brudvik ,&nbsp;L. Isaksson ,&nbsp;K. Livingston ,&nbsp;B. Nilsson ,&nbsp;B. Schroder","doi":"10.1016/j.nuclphysa.2024.122891","DOIUrl":"https://doi.org/10.1016/j.nuclphysa.2024.122891","url":null,"abstract":"<div><p>The photon beam asymmetry of the <span><math><mmultiscripts><mrow><mi>C</mi></mrow><mprescripts></mprescripts><none></none><mrow><mn>12</mn></mrow></mmultiscripts><msup><mrow><mo>(</mo><mover><mrow><mi>γ</mi></mrow><mrow><mo>→</mo></mrow></mover><mo>,</mo><msub><mrow><mi>p</mi></mrow><mrow><mn>01</mn></mrow></msub><mo>)</mo></mrow><mrow><mn>11</mn></mrow></msup><mi>B</mi></math></span> and <span><math><mmultiscripts><mrow><mi>C</mi></mrow><mprescripts></mprescripts><none></none><mrow><mn>12</mn></mrow></mmultiscripts><msup><mrow><mo>(</mo><mover><mrow><mi>γ</mi></mrow><mrow><mo>→</mo></mrow></mover><mo>,</mo><msub><mrow><mi>p</mi></mrow><mrow><mn>2</mn><mo>−</mo><mn>6</mn></mrow></msub><mo>)</mo></mrow><mrow><mn>11</mn></mrow></msup><mi>B</mi></math></span> reactions has been measured in the energy range 40–65 MeV, using a tagged, linearly-polarized photon beam at the MAX-lab facility in Sweden. The asymmetry of the <span><math><mmultiscripts><mrow><mi>C</mi></mrow><mprescripts></mprescripts><none></none><mrow><mn>12</mn></mrow></mmultiscripts><msup><mrow><mo>(</mo><mover><mrow><mi>γ</mi></mrow><mrow><mo>→</mo></mrow></mover><mo>,</mo><msub><mrow><mi>p</mi></mrow><mrow><mn>01</mn></mrow></msub><mo>)</mo></mrow><mrow><mn>11</mn></mrow></msup><mi>B</mi></math></span> reaction to ground and first excited state of <span><math><mmultiscripts><mrow><mi>B</mi></mrow><mprescripts></mprescripts><none></none><mrow><mn>11</mn></mrow></mmultiscripts></math></span> is <span><math><mi>Σ</mi><mo>≈</mo><mn>0.82</mn></math></span> over the measured energy range. The main contribution to the <span><math><mmultiscripts><mrow><mi>C</mi></mrow><mprescripts></mprescripts><none></none><mrow><mn>12</mn></mrow></mmultiscripts><msup><mrow><mo>(</mo><mover><mrow><mi>γ</mi></mrow><mrow><mo>→</mo></mrow></mover><mo>,</mo><msub><mrow><mi>p</mi></mrow><mrow><mn>2</mn><mo>−</mo><mn>6</mn></mrow></msub><mo>)</mo></mrow><mrow><mn>11</mn></mrow></msup><mi>B</mi></math></span> reaction to higher excited states comes from processes in which the residual nucleus is in the <span><math><mn>3</mn><mo>/</mo><msup><mrow><mn>2</mn></mrow><mrow><mo>−</mo></mrow></msup></math></span>(5.02<!--> <!-->MeV) or <span><math><mn>7</mn><mo>/</mo><msup><mrow><mn>2</mn></mrow><mrow><mo>−</mo></mrow></msup></math></span>(6.74<!--> <!-->MeV) excited states. The asymmetry of this reaction is <span><math><mi>Σ</mi><mo>≈</mo><mn>0.6</mn></math></span>, close to the value for free deuteron photodisintegration.</p></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1048 ","pages":"Article 122891"},"PeriodicalIF":1.4,"publicationDate":"2024-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140950616","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":"Investigation of breakup process in 9Be(α,n)12C reaction","authors":"Ritika Datta ,&nbsp;K. Banerjee ,&nbsp;Sujoy Chatterjee ,&nbsp;Rajkumar Santra ,&nbsp;R. Shil ,&nbsp;S. Manna ,&nbsp;Pratap Roy ,&nbsp;T.K. Rana ,&nbsp;G. Mukherjee ,&nbsp;T.K. Ghosh ,&nbsp;A.S. Roy ,&nbsp;A. Sen ,&nbsp;S. Kundu ,&nbsp;Anirudhha Dey ,&nbsp;P. Karmakar ,&nbsp;D. Pandit ,&nbsp;A.K. Bakshi ,&nbsp;B.K. Sapra ,&nbsp;C. Bhattacharyya","doi":"10.1016/j.nuclphysa.2024.122890","DOIUrl":"https://doi.org/10.1016/j.nuclphysa.2024.122890","url":null,"abstract":"<div><p>Neutron energies and angular distributions were measured in ⁹Be(<em>α</em>,n)¹²C reaction for <em>α</em> energies of 5.5 and 6.5 MeV. Three major neutron groups were observed in the spectrum, which correspond to the ground and first two excited states of ¹²C. Measured data could only be explained by the TALYS calculation if reaction at more than one location within the target is considered for a given beam energy. The preferred locations are driven by the resonance energy levels existing in ¹³C. Neutron yield due to the ⁹Be breakup process was determined which is found to be 12.6 ± 0.2% and 18.4 ± 0.5% of the total reaction cross-section for 5.5 and 6.5 MeV respectively.</p></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1048 ","pages":"Article 122890"},"PeriodicalIF":1.4,"publicationDate":"2024-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140950615","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":"A systematic study of the ground state properties of gold nuclei near the neutron drip line using HFB formalism","authors":"Anjana A V,&nbsp;Nicemon Thomas,&nbsp;Antony Joseph","doi":"10.1016/j.nuclphysa.2024.122889","DOIUrl":"https://doi.org/10.1016/j.nuclphysa.2024.122889","url":null,"abstract":"<div><p>In this theoretical work, the ground state properties like binding energy per nucleon, two-neutron separation energy, two-neutron shell gap, neutron-pairing gap, neutron rms radii, proton rms radii, charge radii, neutron skin thickness and nucleon density distributions of odd-even and odd-odd gold isotopes (<span><math><mmultiscripts><mrow><mi>A</mi></mrow><mprescripts></mprescripts><none></none><mrow><mn>165</mn><mo>−</mo><mn>265</mn></mrow></mmultiscripts><mi>u</mi></math></span>) were systematically studied. Computations were performed for a wide mass range of gold nuclei, spanned from the proton-rich side to the neutron-rich side, following the Hartree-Fock-Bogoliubov theory. Based on this approach, the nuclear structure of gold isotopes lying up to the exotic neutron rich region where the experimental data are not available, was also investigated. Calculations, taking into account the UNEDF0 Skyrme effective interaction, reproduce the available experimental data and results of other nuclear model based estimations, such as the Relativistic-Continuum-Hartree-Bogoliubov theory and the Finite Range Droplet Models, reasonably well.</p></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1047 ","pages":"Article 122889"},"PeriodicalIF":1.4,"publicationDate":"2024-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140879067","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":"Probing deformed nuclei: Experimental insights into excited states of 152,153,154Gd isotopes through fusion-evaporation reactions","authors":"S. Pelonis ,&nbsp;T.J. Mertzimekis ,&nbsp;A. Chalil ,&nbsp;P. Vasileiou ,&nbsp;A. Zyriliou ,&nbsp;G. Zagoraios ,&nbsp;D. Papaioannou ,&nbsp;F.C.L. Crespi ,&nbsp;A. Bracco ,&nbsp;N. Florea ,&nbsp;N. Marginean ,&nbsp;L. Stan ,&nbsp;A. Turturica","doi":"10.1016/j.nuclphysa.2024.122888","DOIUrl":"https://doi.org/10.1016/j.nuclphysa.2024.122888","url":null,"abstract":"<div><p>The rare-earth region has been the focus of various studies aiming at the understanding of nuclear structure and providing information on the details of the reaction mechanism. The Gd isotopes belong to this group of nuclei and despite the available spectroscopic information, several open questions about their structure still exist, such as the inter-band transitions related to shape evolution or branching-ratios in deformed states. In addition, production cross sections of different reactions to Gd isotopes are largely unknown.</p><p>In this work, we report on an experimental attempt to populate the excited states in the isotopes ^152,153,154Gd by employing the heavy-ion fusion reaction ¹⁸O+¹³⁸Ba → ^156-xGd + <em>xn</em> in the 58-64 MeV energy range (center-of-mass). The experiment was conducted at the 9 MV FV Pelletron Tandem at the Horia Hulubei National Institute for Physics and Nuclear Engineering, employing the ROSPHERE array. Several branching-ratios for energy levels in ^152,153Gd have been measured, offering new and updated values. Furthermore, relative cross sections regarding the fusion-evaporation reactions ¹³⁸Ba(¹⁸O, 4n)¹⁵²Gd, ¹³⁸Ba(¹⁸O, 3n)¹⁵³Gd, and ¹³⁸Ba(¹⁸O, 2n)¹⁵⁴Gd have been measured and compared with theoretical calculations with PACE4.</p></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1047 ","pages":"Article 122888"},"PeriodicalIF":1.4,"publicationDate":"2024-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140843728","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}