Nuclear Physics A最新文献

{"title":"Isotopic dependence of (n,α) reaction cross sections for Fe and Sn nuclei","authors":"S. Küçüksucu ,&nbsp;M. Yiğit ,&nbsp;N. Paar","doi":"10.1016/j.nuclphysa.2023.122779","DOIUrl":"https://doi.org/10.1016/j.nuclphysa.2023.122779","url":null,"abstract":"<div><p>The <span><math><mo>(</mo><mi>n</mi><mo>,</mo><mi>α</mi><mo>)</mo></math></span> reactions play an important role for the energy generation and the synthesis of chemical elements in the stars, as well as for nuclear engineering and medical applications. The aim of this study is to explore the evolution of <span><math><mo>(</mo><mi>n</mi><mo>,</mo><mi>α</mi><mo>)</mo></math></span> reactions in Fe and Sn isotope chains in order to assess the cross section properties with the increase of neutron number in target nucleus, and to make a comparison with other relevant neutron induced reactions. The cross section calculations are based on the statistical Hauser-Feshbach and exciton models in TALYS nuclear reaction code, using global optical model potential that is additionally adjusted by the <span><math><mo>(</mo><mi>n</mi><mo>,</mo><mi>α</mi><mo>)</mo></math></span> cross section data for ⁵⁴Fe and ¹¹⁸Sn. The calculations of <span><math><mo>(</mo><mi>n</mi><mo>,</mo><mi>α</mi><mo>)</mo></math></span> reactions in Fe and Sn isotopes provide the insight into their isotopic dependence and properties over the complete relevant range of neutron energies. The cross sections result in pronounced maxima at lower-mass isotopes, and rather strong decrease for neutron-rich nuclei consistent with the reduction of the reaction <em>Q</em>-value and increased contributions from other exit channels from compound nucleus. The analysis of the Maxwellian averaged cross sections at temperatures in stellar environment shows that the <span><math><mo>(</mo><mi>n</mi><mo>,</mo><mi>α</mi><mo>)</mo></math></span> reactions have significant contributions for low-mass Fe isotopes, that is opposite than for Sn isotopes. For both neutron rich isotopes <em>γ</em> and neutron emissions dominate, with their interplay depending on the temperature involved.</p></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50183028","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":"Experimental 7Be production cross section from the Li7(p,n)7Be reaction at Ep = 3.5 − 13 MeV","authors":"Á. Tóth ,&nbsp;Gy. Gyürky ,&nbsp;E. Papp ,&nbsp;T. Szücs","doi":"10.1016/j.nuclphysa.2023.122778","DOIUrl":"https://doi.org/10.1016/j.nuclphysa.2023.122778","url":null,"abstract":"<div><p>The <span><math><mmultiscripts><mrow><mi>Li</mi></mrow><mprescripts></mprescripts><none></none><mrow><mn>7</mn></mrow></mmultiscripts><mo>(</mo><mi>p</mi><mo>,</mo><mi>n</mi><mo>)</mo><msup><mrow></mrow><mrow><mn>7</mn></mrow></msup><mrow><mi>Be</mi></mrow></math></span> reaction is widely used as neutron source for neutron induced reaction cross section measurements, and for ⁷Be radioactive source production. There are two prominent structures in the excitation function, a narrow resonance between <span><math><msub><mrow><mi>E</mi></mrow><mrow><mi>p</mi></mrow></msub><mo>=</mo><mn>2.2</mn><mo>−</mo><mn>2.3</mn></math></span> MeV, and a broad peak, around <span><math><msub><mrow><mi>E</mi></mrow><mrow><mi>p</mi></mrow></msub><mo>=</mo><mn>5</mn></math></span> MeV. There are tension between the experimental data sets both in the position and the width of this latter structure, as well as in the absolute scale of the data. In the present work the <span><math><mmultiscripts><mrow><mi>Li</mi></mrow><mprescripts></mprescripts><none></none><mrow><mn>7</mn></mrow></mmultiscripts><mo>(</mo><mi>p</mi><mo>,</mo><mi>n</mi><mo>)</mo><msup><mrow></mrow><mrow><mn>7</mn></mrow></msup><mrow><mi>Be</mi></mrow></math></span> reaction is investigated using the activation technique, with the aim of providing comprehensive cross section data covering the second structure and connecting prior literature data sets. The irradiations were performed with the Atomki cyclotron accelerator with pairs of thin foil targets, thus with precisely controlled reaction energy in the range of <span><math><msub><mrow><mi>E</mi></mrow><mrow><mi>p</mi></mrow></msub><mo>=</mo><mn>3.5</mn><mo>−</mo><mn>13</mn></math></span> MeV. After the irradiations the activity of the samples was measured using a high-purity germanium detector. The energy uncertainty of the new data points is much smaller than in any of the previous works, while the cross section uncertainty is comparable with the most precise literature data. A consistent data set was obtained connecting the most recent and most precise literature data sets. With the new data the absolute magnitude of the <span><math><mmultiscripts><mrow><mi>Li</mi></mrow><mprescripts></mprescripts><none></none><mrow><mn>7</mn></mrow></mmultiscripts><mo>(</mo><mi>p</mi><mo>,</mo><mi>n</mi><mo>)</mo><msup><mrow></mrow><mrow><mn>7</mn></mrow></msup><mrow><mi>Be</mi></mrow></math></span> reaction cross section is constrained and became more precise.</p></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50183030","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":"Fully charmed resonance X(6900) and its beauty counterpart","authors":"S.S. Agaev ,&nbsp;K. Azizi ,&nbsp;B. Barsbay ,&nbsp;H. Sundu","doi":"10.1016/j.nuclphysa.2023.122768","DOIUrl":"https://doi.org/10.1016/j.nuclphysa.2023.122768","url":null,"abstract":"<div><p>The fully heavy scalar tetraquarks <span><math><msub><mrow><mi>T</mi></mrow><mrow><mn>4Q</mn></mrow></msub><mo>=</mo><mi>Q</mi><mi>Q</mi><mover><mrow><mi>Q</mi></mrow><mo>‾</mo></mover><mover><mrow><mi>Q</mi></mrow><mo>‾</mo></mover></math></span>, (<span><math><mi>Q</mi><mo>=</mo><mi>c</mi><mo>,</mo><mi>b</mi></math></span>) are explored in the context of QCD sum rule method. We model <span><math><msub><mrow><mi>T</mi></mrow><mrow><mn>4Q</mn></mrow></msub></math></span> as diquark-antidiquark systems composed of pseudoscalar constituents, and calculate their masses <span><math><msup><mrow><mi>m</mi></mrow><mrow><mo>(</mo><mo>′</mo><mo>)</mo></mrow></msup></math></span> and couplings <span><math><msup><mrow><mi>f</mi></mrow><mrow><mo>(</mo><mo>′</mo><mo>)</mo></mrow></msup></math></span> within the two-point sum rule approach. Our results <span><math><mi>m</mi><mo>=</mo><mo>(</mo><mn>6928</mn><mo>±</mo><mn>50</mn><mo>)</mo><mspace></mspace><mrow><mi>MeV</mi></mrow></math></span> and <span><math><msup><mrow><mi>m</mi></mrow><mrow><mo>′</mo></mrow></msup><mo>=</mo><mo>(</mo><mn>18858</mn><mo>±</mo><mn>50</mn><mo>)</mo><mspace></mspace><mrow><mi>MeV</mi></mrow></math></span> for masses of the tetraquarks <span><math><msub><mrow><mi>T</mi></mrow><mrow><mn>4c</mn></mrow></msub></math></span> and <span><math><msub><mrow><mi>T</mi></mrow><mrow><mn>4b</mn></mrow></msub></math></span> prove that they can decay to hidden-flavor heavy mesons. The full width <span><math><msub><mrow><mi>Γ</mi></mrow><mrow><mn>4c</mn></mrow></msub></math></span> of the <span><math><msub><mrow><mi>T</mi></mrow><mrow><mn>4c</mn></mrow></msub></math></span> is evaluated by taking into account the decay channels <span><math><msub><mrow><mi>T</mi></mrow><mrow><mn>4c</mn></mrow></msub><mo>→</mo><mi>J</mi><mo>/</mo><mi>ψ</mi><mi>J</mi><mo>/</mo><mi>ψ</mi></math></span>, <span><math><mi>J</mi><mo>/</mo><mi>ψ</mi><msup><mrow><mi>ψ</mi></mrow><mrow><mo>′</mo></mrow></msup></math></span>, <span><math><msub><mrow><mi>η</mi></mrow><mrow><mi>c</mi></mrow></msub><msub><mrow><mi>η</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span>, <span><math><msub><mrow><mi>η</mi></mrow><mrow><mi>c</mi></mrow></msub><msub><mrow><mi>η</mi></mrow><mrow><mi>c</mi></mrow></msub><mo>(</mo><mn>2</mn><mi>S</mi><mo>)</mo></math></span>, <span><math><msub><mrow><mi>η</mi></mrow><mrow><mi>c</mi></mrow></msub><msub><mrow><mi>χ</mi></mrow><mrow><mi>c</mi><mn>1</mn></mrow></msub><mo>(</mo><mn>1</mn><mi>P</mi><mo>)</mo></math></span>, and <span><math><msub><mrow><mi>χ</mi></mrow><mrow><mi>c</mi><mn>0</mn></mrow></msub><msub><mrow><mi>χ</mi></mrow><mrow><mi>c</mi><mn>0</mn></mrow></msub></math></span>. The partial widths of these processes depend on strong couplings <span><math><msub><mrow><mi>g</mi></mrow><mrow><mi>i</mi></mrow></msub></math></span> at vertices <span><math><msub><mrow><mi>T</mi></mrow><mrow><mn>4c</mn></mrow></msub><mi>J</mi><mo>/</mo><mi>ψ</mi><mi>J</mi><mo>/</mo><mi>ψ</mi></math></span>, <","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50183032","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":"Neutrino-induced reactions on 18O and implications of 18O mixture in water Cherenkov detectors on supernova neutrino events","authors":"Toshio Suzuki ,&nbsp;Ken'ichiro Nakazato ,&nbsp;Makoto Sakuda","doi":"10.1016/j.nuclphysa.2023.122719","DOIUrl":"https://doi.org/10.1016/j.nuclphysa.2023.122719","url":null,"abstract":"<div><p>Neutrino-nucleus reaction cross sections on ¹⁸O are evaluated by shell-model calculations and compared with those on ¹⁶O. Important contributions from Gamow-Teller transitions are noticed for ¹⁸O (<span><math><msub><mrow><mi>ν</mi></mrow><mrow><mi>e</mi></mrow></msub></math></span>, e⁻) ¹⁸F in contrary to the case for ¹⁶O, where spin-dipole transitions are dominant contributions. Calculated cross sections for ¹⁸O (<span><math><msub><mrow><mi>ν</mi></mrow><mrow><mi>e</mi></mrow></msub></math></span>, e⁻) ¹⁸F are shown to be larger than for ¹⁶O at low neutrino energies below 20 MeV in natural water with the 0.205% admixture of ¹⁸O due to the lower threshold energy (1.66 MeV) for ¹⁸O than that for ¹⁶<span>O (15.42 MeV). The resulting electron spectra, that is, the cross sections as functions of emitted electron energy </span><span><math><msub><mrow><mi>T</mi></mrow><mrow><mi>e</mi></mrow></msub></math></span>, are also shown to be quite different, reflecting the different threshold energies. The electron spectra from (<span><math><msub><mrow><mi>ν</mi></mrow><mrow><mi>e</mi></mrow></msub></math></span>, e⁻) reactions on ¹⁸O and ¹⁶<span>O in water Cherenkov detectors for supernova<span> neutrino detection are investigated for both the cases with and without the neutrino oscillation and compared with those of the neutrino-electron scattering. It has been shown that the contribution from </span></span>¹⁸O (0.205% mixture) enhances the rates from ¹⁶O by 60% for the case without the oscillation and by 20-30% for the case with the oscillation below <span><math><msub><mrow><mi>T</mi></mrow><mrow><mi>e</mi></mrow></msub></math></span> =20 MeV. For the case with the neutrino oscillation, the event rates for ¹⁸O and ¹⁶O become comparable to those of the neutrino-electron scattering. However, their rates at low energy (<span><math><msub><mrow><mi>T</mi></mrow><mrow><mi>e</mi></mrow></msub><mo>&lt;</mo></math></span> 20 MeV) are much lower than those of the neutrino-electron scattering, which is important for the pointing accuracy to the supernova direction.</p></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50176457","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":"Surface and decay properties of newly synthesized 207,208Th isotopes for various α-decay chains","authors":"Jeet Amrit Pattnaik ,&nbsp;R.N. Panda ,&nbsp;M. Bhuyan ,&nbsp;S.K. Patra","doi":"10.1016/j.nuclphysa.2023.122722","DOIUrl":"https://doi.org/10.1016/j.nuclphysa.2023.122722","url":null,"abstract":"<div><p><span><span>Considering various initial deformations, the ground, first excited, and second excited states binding energies are calculated using the effective field theory motivated relativistic mean-field based IOPB-I force parameter. The </span>alpha decay chains for both the </span>²⁰⁷Th and ²⁰⁸Th are examined. As observed for both nuclei, it takes four subsequent <em>α</em>-particle emissions to reach the stable Pb nucleus. The half-lives determined by two widely used Viola-Seaborg and modified universal decay law formulas are compared with the available experimental data. The surface property-like symmetry energy is also predicted for these nuclei in the framework of the coherent density fluctuation model and establishes a connection between the decay behavior and the symmetry energy.</p></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50176459","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":"Implementation of cluster expansion for hot QCD matter","authors":"Niels-Uwe Friedrich Bastian ,&nbsp;Pasi Huovinen ,&nbsp;Elizaveta Nazarova","doi":"10.1016/j.nuclphysa.2023.122718","DOIUrl":"https://doi.org/10.1016/j.nuclphysa.2023.122718","url":null,"abstract":"<div><p>We present a cluster expansion EoS<span> model for strongly-interacting matter based on the generalized Beth-Uhlenbeck formalism to describe hadrons<span><span> as bound clusters of quarks. This formalism can describe both confined and deconfined phases. Our emphasis is on the region of vanishing baryon densities, where numerical solutions available from Lattice </span>QCD predict a smooth crossover transition from hadron to quark matter. Medium effects are taken into account as self energies, which are motivated from both perturbative QCD calculations and phenomenological models. Parameters are tuned to Lattice QCD data and result in a good agreement of the thermodynamics.</span></span></p></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50176454","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 alpha-induced reaction cross-sections for natZn with detailed covariance analysis","authors":"Mahesh Choudhary ,&nbsp;Aman Sharma ,&nbsp;Namrata Singh ,&nbsp;A. Gandhi ,&nbsp;S. Dasgupta ,&nbsp;J. Datta ,&nbsp;K. Katovsky ,&nbsp;A. Kumar","doi":"10.1016/j.nuclphysa.2023.122720","DOIUrl":"https://doi.org/10.1016/j.nuclphysa.2023.122720","url":null,"abstract":"<div><p>The production cross-section of ⁶⁸Ge, ⁶⁹Ge, ⁶⁵Zn and ⁶⁷Ga radioisotopes from alpha-induced nuclear reaction with <span><math><msup><mrow></mrow><mrow><mi>n</mi><mi>a</mi><mi>t</mi></mrow></msup></math></span>Zn have been measured using the stacked foil activation technique followed by the off-line <em>γ</em>-ray spectroscopy in the incident alpha energy range 14-37 MeV. The obtained nuclear reaction cross-sections are compared with previous experimental data available in the EXFOR data library, evaluated nuclear data from TENDL-2019 and theoretical results, calculated using TALYS nuclear reaction code. We have also performed the detailed uncertainty analysis for these nuclear reactions and their respective correlation metrics are presented. Since <em>α</em>-induced reactions are important in nuclear medicine and developing the nuclear reaction codes so needful corrections related to the coincidence summing factor and the geometric factor have been considered during the data analysis in the present study.</p></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50176460","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":"Boltzmann distributions on a quantum computer via active cooling","authors":"Carter Ball,&nbsp;Thomas D. Cohen","doi":"10.1016/j.nuclphysa.2023.122708","DOIUrl":"https://doi.org/10.1016/j.nuclphysa.2023.122708","url":null,"abstract":"<div><p><span><span>Quantum computing<span> raises the possibility of solving a variety of problems in physics that are presently intractable. A number of such problems involves the physics of systems in or near thermal equilibrium. There are two main ways to compute thermal expectation values on a </span></span>quantum computer: construct a thermal state that reproduces thermal expectation values, or sample various energy eigenstates from a </span>Boltzmann distribution<span> of a given temperature. In this paper we address the second approach and propose an algorithm that uses active cooling to produce the distribution. While this algorithm is quite general and applicable to a wide variety of systems, it was developed with the specific intention of simulating thermal configurations of non-Abelian gauge theories such as QCD, which would allow the study of quark-gluon plasma created in heavy-ion collisions.</span></p></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50176456","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":"Effect of double spin-orbit parameters of spin-orbit strength in reactions involving spherical-prolate, spherical-oblate, oblate-prolate and oblate-oblate configurations","authors":"Rajni ,&nbsp;Ashutosh Kaushik ,&nbsp;Manoj K. Sharma ,&nbsp;Ajay Kumar Rai","doi":"10.1016/j.nuclphysa.2023.122723","DOIUrl":"https://doi.org/10.1016/j.nuclphysa.2023.122723","url":null,"abstract":"<div><p>The present work is carried out to see the role of double spin-orbit parameters (W₁ and W₂<span>) on reactions having spherical-prolate, spherical-oblate, oblate-prolate and oblate-oblate configurations. For the study, semi-classical Skyrme energy density formalism is used by employing SkIx (x=2,3,4) and SAMi Skyrme forces. The calculations suggest that the presence of double spin-orbit strength imparts significant influence on spin-dependent potential (V</span>_<em>J</em>) as maximum barrier height of <span><math><msub><mrow><mi>V</mi></mrow><mrow><mi>J</mi></mrow></msub></math></span> (V<span><math><msub><mrow></mrow><mrow><mi>J</mi><mi>B</mi></mrow></msub></math></span>) is observed with SAMi force (W₁≠W₂) and minimum with SkI2 (W₁=W₂) i.e., V<span><math><msub><mrow></mrow><mrow><mi>J</mi><mi>B</mi></mrow></msub></math></span><span><math><msub><mrow></mrow><mrow><mo>(</mo><mi>S</mi><mi>A</mi><mi>M</mi><mi>i</mi><mo>)</mo></mrow></msub></math></span>&gt;V<span><math><msub><mrow></mrow><mrow><mi>J</mi><mi>B</mi></mrow></msub></math></span><span><math><msub><mrow></mrow><mrow><mo>(</mo><mi>S</mi><mi>k</mi><mi>I</mi><mn>4</mn><mo>)</mo></mrow></msub></math></span>&gt;V<span><math><msub><mrow></mrow><mrow><mi>J</mi><mi>B</mi></mrow></msub></math></span><span><math><msub><mrow></mrow><mrow><mo>(</mo><mi>S</mi><mi>k</mi><mi>I</mi><mn>3</mn><mo>)</mo></mrow></msub></math></span>&gt;V<span><math><msub><mrow></mrow><mrow><mi>J</mi><mi>B</mi></mrow></msub></math></span><span><math><msub><mrow></mrow><mrow><mo>(</mo><mi>S</mi><mi>k</mi><mi>I</mi><mn>2</mn><mo>)</mo></mrow></msub></math></span>. The maxima and minima in <span><math><msub><mrow><mi>V</mi></mrow><mrow><mi>J</mi><mi>B</mi></mrow></msub></math></span> are further related to the contribution from the isoscalar and isovector parts of the spin-orbit potential. As far as shape of projectile and(or) target is concerned, the higher V<span><math><msub><mrow></mrow><mrow><mi>J</mi><mi>B</mi></mrow></msub></math></span> is obtained for oblate-prolate configuration and lower when spherical-prolate configuration is used. The chosen Skyrme forces also modify the fusion barrier height V_<em>B</em> of different target-projectile combinations in the similar way as the spin-orbit barrier height (V<span><math><msub><mrow></mrow><mrow><mi>J</mi><mi>B</mi></mrow></msub></math></span>) does. These Skyrme forces are further applied to address the experimental fusion excitation functions and fusion barrier distributions of the considered reacting partners. The contribution of V_<em>J</em> is also estimated in fusion cross-section of considered reactions.</p></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50176458","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":"Nuclear mass predictions with multi-hidden-layer feedforward neural network","authors":"Xian-Kai Le,&nbsp;Nan Wang,&nbsp;Xiang Jiang","doi":"10.1016/j.nuclphysa.2023.122707","DOIUrl":"https://doi.org/10.1016/j.nuclphysa.2023.122707","url":null,"abstract":"<div><p><span>Based on Keras deep learning<span> framework, the feedforward neural network (FNN) model is employed to improve the predictions of the liquid drop model (LDM). It is shown that the prediction ability of FNN can be significantly improved if multiple hidden layers are used with only four input parameters. The root-mean-square deviation (RMSD) of nuclear mass predicted by LDM can be reduced from 2.38 MeV to 196 keV with the multi-hidden-layer FNN model, which is only one third of the single-hidden-layer FNN model. The predictions of two-neutron separation energies (</span></span><em>S</em>_2n) and single-neutron separation energies (<span><math><msub><mrow><mi>S</mi></mrow><mrow><mi>n</mi></mrow></msub></math></span>) indicate that the multi-hidden-layer FNN model gives a better description of the shell structure. In addition, the extrapolation capability of the model in the super-heavy nuclear region is studied, the results show that better extrapolation capability can be achieved if multiple hidden layers are employed.</p></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50176461","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}