Nuclear Physics A最新文献

{"title":"Probing multi-particle bunching from intermittency analysis in relativistic heavy-ion collisions","authors":"Valeria Zelina Reyna Ortiz,&nbsp;Maciej Rybczyński,&nbsp;Zbigniew Włodarczyk","doi":"10.1016/j.nuclphysa.2024.122980","DOIUrl":"10.1016/j.nuclphysa.2024.122980","url":null,"abstract":"<div><div>It has been demonstrated that factorial moments analysis in dependence on the size of phase-space cells (when the latter is decreased but is still considerably large) exhibits sensitivity to particle bunching within a system situated in the two-dimensional cell. Based on recent findings concerning fluctuations in charge particle density observed in central Au + Au collisions at various energies ranging from <span><math><msqrt><mrow><msub><mrow><mi>s</mi></mrow><mrow><mi>N</mi><mi>N</mi></mrow></msub></mrow></msqrt></math></span> = 7.7 to 200 GeV at RHIC/STAR, it is proposed that analyzing factorial moments in relativistic heavy-ion collisions could serve as a method to investigate density fluctuations linked to correlation phenomena. Our understanding of particle production mechanisms may be enriched by using factorial moments analysis to gain new information contained in them that was initiated four decades ago from observation of “spike” phenomena.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1053 ","pages":"Article 122980"},"PeriodicalIF":1.7,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142652731","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":"Investigation of the proton radius of the Borromean halo nucleus 19B","authors":"D. Prajapati ,&nbsp;R. Kanungo ,&nbsp;Y.K. Tanaka ,&nbsp;S. Bagchi ,&nbsp;H. Geissel ,&nbsp;P. Doornenbal ,&nbsp;W. Horiuchi ,&nbsp;D.S. Ahn ,&nbsp;H. Baba ,&nbsp;K. Behr ,&nbsp;F. Browne ,&nbsp;S. Chen ,&nbsp;M.L. Cortés ,&nbsp;A. Estradé ,&nbsp;N. Fukuda ,&nbsp;M. Holl ,&nbsp;K. Itahashi ,&nbsp;N. Iwasa ,&nbsp;W.G. Jiang ,&nbsp;S. Kaur ,&nbsp;K. Yoshida","doi":"10.1016/j.nuclphysa.2024.122977","DOIUrl":"10.1016/j.nuclphysa.2024.122977","url":null,"abstract":"<div><div>The charge-changing cross-section (<span><math><msub><mrow><mi>σ</mi></mrow><mrow><mi>c</mi><mi>c</mi></mrow></msub></math></span>) of the dripline nucleus, ¹⁹B, was measured using the transmission technique at RIBF, RIKEN, to understand its root mean square proton radius (<span><math><msub><mrow><mi>R</mi></mrow><mrow><mi>p</mi></mrow></msub></math></span>). This new measurement will be the first determination of the <span><math><msub><mrow><mi>R</mi></mrow><mrow><mi>p</mi></mrow></msub></math></span> for the Borromean nucleus, ¹⁹B. The new value of <span><math><msub><mrow><mi>R</mi></mrow><mrow><mi>p</mi></mrow></msub></math></span> will help determine the geometrical structure of ¹⁹B and the neutron-neutron correlation in the Borromean nucleus.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1053 ","pages":"Article 122977"},"PeriodicalIF":1.7,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142652730","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":"Re-visiting the role of short-range correlations on neutron-star properties","authors":"Sakshi Gautam ,&nbsp;Anagh Venneti ,&nbsp;Sarmistha Banik ,&nbsp;B.K. Agrawal","doi":"10.1016/j.nuclphysa.2024.122978","DOIUrl":"10.1016/j.nuclphysa.2024.122978","url":null,"abstract":"<div><div>The impact of short-range correlations (SRCs) on neutron star (NS) properties is re-examined across various classes of relativistic mean-field (RMF) models. The coupling strengths of the models are so adjusted that the low-density part of the equation of state (EoS), complemented with saturation properties such as binding energy of symmetric nuclear matter and nuclear symmetry energy responsible for the bulk properties of finite nuclei, remains practically unaffected with the inclusion of SRCs. The EoS for symmetric nuclear matter and the nuclear symmetry energy at supra-saturation densities which governs the EoS for NS matter become softer or stiffer in the presence of the SRCs, depending on the type of RMF model considered. These distinct effects of SRCs are observed to be more significant at higher densities, as expected, when behaviour of the EoS at low densities, which govern the finite nuclei physics, is not compromised. For most of the models with self-couplings of scalar and vector mesons, the EoS of symmetric nuclear matter stiffens, with a slight effect on nuclear symmetry energy with the inclusion of SRCs. Conversely, in the models incorporating cross-couplings between mesons, the addition of SRCs leads to softer symmetry energy, compensating the stiffening effect of the EoS of symmetric nuclear matter. With the inclusion of SRCs, the values of radius and tidal deformability of canonical mass star and maximum mass of NSs for realistic EoSs align well the present constraints on astrophysical observations.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1053 ","pages":"Article 122978"},"PeriodicalIF":1.7,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142652732","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":"Elucidating shell/subshell closure and the critical impact of isospin-asymmetry on barium isotopes using relativistic mean-field approach","authors":"N. Biswal ,&nbsp;Praveen K. Yadav ,&nbsp;R.N. Panda ,&nbsp;S. Mishra ,&nbsp;M. Bhuyan","doi":"10.1016/j.nuclphysa.2024.122975","DOIUrl":"10.1016/j.nuclphysa.2024.122975","url":null,"abstract":"<div><div>The aspect of structural evolution and the correlation of the properties of the ground state with the effective symmetry energy and its coefficients is examined for neutron-rich <em>even-even</em> isotopes of barium nuclei (<em>Z</em> = 56). The nuclear bulk properties such as binding energy, root-mean-square charge radius, quadrupole deformation, two neutron separation energy, and two neutron shell gaps are calculated using the axially deformed relativistic mean field formalism for nonlinear NL3^⁎ and density-dependent sets of DD-ME2 force parameters. The calculated results are further compared with the available experimental data and other theoretical models. The results of the bulk nuclear properties indicate <em>N</em> = 82 as a neutron shell closure near the neutron-rich side of the isotopic chain of Ba nuclei. Alternatively, a systematic analysis of isospin-dependent observables, such as the nuclear symmetry energy and its volume and surface components, is estimated along the isotopic chain, which is crucial for studying shell/subshell closure away from the <em>β</em>-stability line. This work incorporates two types of relativistic mean-field densities as inputs. Firstly, the spherical density using the NL3* and DD-ME2 parameter sets. Secondly, for comparison, the monopole component of the multipole expanded deformed density using the DD-ME2 parameter. From the isospin-dependent properties, we observe that both the spherical and monopole components of the deformed density follow a similar trend along the isotopic chain. The isospin-dependent quantities are in accordance with the nuclear bulk properties while verifying the traditional shell closure at <em>N</em> = 82 for the neutron-rich Ba nuclei. In addition, we noticed a significant peak near <em>N</em> = 58, indicating greater stability than its neighbouring nuclei. Consequently, this study provides a novel region of interest for isospin-based experimental and theoretical studies. Furthermore, the present investigation is quite relevant for understanding the role of isospin-asymmetry in the variation of nuclear properties, which is pivotal for elucidating the synthesis of exotic nuclei along the nuclear chart.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1053 ","pages":"Article 122975"},"PeriodicalIF":1.7,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142560699","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 new measurement of 174Hf alpha decay","authors":"P. Belli ,&nbsp;R. Bernabei ,&nbsp;F. Cappella ,&nbsp;V. Caracciolo ,&nbsp;R. Cerulli ,&nbsp;A. Incicchitti ,&nbsp;M. Laubenstein ,&nbsp;A. Leoncini ,&nbsp;V. Merlo ,&nbsp;S.S. Nagorny ,&nbsp;V.V. Nahorna ,&nbsp;S. Nisi ,&nbsp;P. Wang","doi":"10.1016/j.nuclphysa.2024.122976","DOIUrl":"10.1016/j.nuclphysa.2024.122976","url":null,"abstract":"<div><div>A new measurement of ¹⁷⁴Hf alpha decay to the ground state of ¹⁷⁰Yb was performed deep underground at the Gran Sasso National Laboratory (LNGS) of the INFN (Italy). The experimental data were accumulated over 97.7 days with a 16.87 g Cs₂HfCl₆ single crystal. A new half-life value of ¹⁷⁴Hf <em>α</em> decay: T_1/2 = <span><math><mo>(</mo><msubsup><mrow><mn>3.8</mn></mrow><mrow><mo>−</mo><mn>0.9</mn></mrow><mrow><mo>+</mo><mn>1.7</mn></mrow></msubsup><mo>)</mo><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mn>16</mn></mrow></msup></math></span> yr, was evaluated. The total internal <em>α</em> activity of the crystal is 18.6(4) mBq/kg, and should be further improved, especially in terms of ¹⁴⁷Sm contamination (0.25 mBq/kg), in order to achieve a higher experimental sensitivity.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1053 ","pages":"Article 122976"},"PeriodicalIF":1.7,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142554125","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 measurements and theoretical calculations of excitation functions of 103Rh(α,xn)106m,105g,104gAg and 103Rh(α,αxn)101m,102gRh reactions up to 40 MeV","authors":"Sk Wasim Raja ,&nbsp;R. Acharya ,&nbsp;A. Saha","doi":"10.1016/j.nuclphysa.2024.122974","DOIUrl":"10.1016/j.nuclphysa.2024.122974","url":null,"abstract":"<div><div>Activation cross sections of ¹⁰³Rh(α,xn)^{106m,105g,104g}Ag and ¹⁰³Rh(α,αxn)^101m,102gRh radionuclides were measured at energies ranging from their respective threshold energies up to 40 MeV. Standard stacked foil activation technique was employed for irradiation. Residual activity was assayed using high-resolution gamma-ray spectrometry. Excitation functions were also theoretically calculated using TALYS nuclear reaction model to reproduce the experimental cross section data. The present data are compared with the available literature data, TENDL-2023 data using default values as well as the theoretical data calculated by TALYS-1.96. The shape and amplitude of the experimentally obtained excitation functions were well reproduced theoretically for all the studied radionuclides except for ^105gAg, for which magnitude of the cross sections was not reproduced. The integral yields were also deduced using the measured cross sections and the stopping power of natural Rh from 40 MeV down to their threshold energies for these radionuclides, and compared with the experimental yield data available in the literature.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1053 ","pages":"Article 122974"},"PeriodicalIF":1.7,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142592766","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":"Superheavy magic nuclei: Ground-state properties, bubble structure and α-decay chains","authors":"R. Sharma ,&nbsp;A. Jain ,&nbsp;M. Kumawat ,&nbsp;J.K. Deegwal ,&nbsp;Abdul Quddus ,&nbsp;G. Saxena","doi":"10.1016/j.nuclphysa.2024.122973","DOIUrl":"10.1016/j.nuclphysa.2024.122973","url":null,"abstract":"<div><div>A systematic investigation of superheavy nuclei in the isotopic chains of proton numbers Z=106, 114, 120, and 126 together with isotonic chains of neutron numbers N=162, 172, and 184 is presented in the theoretical framework of relativistic mean-field density functionals based on density-dependent meson-nucleon couplings. Ground-state properties, including binding energy, shape, deformation, density profile, and radius, are estimated to provide compelling evidence of magicity in these even-even nuclei, aligning with the concept of the ‘island of stability.’ The analysis reveals central depletion in the charge density, indicating a bubble-like structure, primarily attributed to the substantial repulsive Coulomb field and the influence of higher <em>l</em>-states. A thorough examination of potential decay modes, employing various semi-empirical formulas, is presented. The probable <em>α</em>-decay chains are evaluated, demonstrating excellent agreement with available experimental data.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1053 ","pages":"Article 122973"},"PeriodicalIF":1.7,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142554124","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 novel four parameter formula for the rotational spectra of even-even nuclei","authors":"A. Obaid ,&nbsp;A.M. Khalaf ,&nbsp;M. Kotb ,&nbsp;H.A. Ghanem ,&nbsp;Nagat A. Elmahdy","doi":"10.1016/j.nuclphysa.2024.122972","DOIUrl":"10.1016/j.nuclphysa.2024.122972","url":null,"abstract":"<div><div>In this article, the authors presents a novel four parameter formula based on developing an expression for the moment of inertia in terms of Bohr-Mottelson Geometric Collective Model (GCM). The formula provides an excellent agreement with the experimental data for all nuclei under consideration. Some key quantities will also be derived such as the rotational frequency, the kinematic and dynamical moment of inertia, and their variation with spin will be investigated. A comparison between our proposed four parameter model with both the variable moment of inertia model, and the recently proposed <em>β</em>-stretching model is also presented. Various <span><math><mi>Δ</mi><mi>I</mi><mo>=</mo><mn>1</mn></math></span> and <span><math><mi>Δ</mi><mi>I</mi><mo>=</mo><mn>2</mn></math></span> energy staggering indices will be presented and compared to the experimental counterpart in the paper.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1053 ","pages":"Article 122972"},"PeriodicalIF":1.7,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142531793","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":"Renormalization of three-body interaction in DDK system","authors":"Cheng-Nan Wu,&nbsp;Jin-Yi Pang","doi":"10.1016/j.nuclphysa.2024.122970","DOIUrl":"10.1016/j.nuclphysa.2024.122970","url":null,"abstract":"<div><div>In systems comprising three identical particles, the Efimov effect emerges in the unitary limit. This article, utilizing the method of effective field theory along with the effective range expansion (ERE) and low-momentum expansion, reproduces the Efimov effect beyond unitary limit and identical case and applies to <em>DDK</em> system. It also links the high-energy scale with the ultraviolet cutoff in the three-body system. We discuss a method for obtaining exact solutions for the three-body wave function below the threshold of dimer production, that is <em>D</em> and <span><math><msubsup><mrow><mi>D</mi></mrow><mrow><mi>s</mi><mn>0</mn></mrow><mrow><mo>⁎</mo></mrow></msubsup><mo>(</mo><mn>2317</mn><mo>)</mo></math></span>. It turns out that introducing this scale is a necessary condition for the emergence of <em>DDK</em> three-body bound state. Since without this scale, the wave function would be solved below threshold with arbitrary binding energy, which violates the conditions of unitarity and energy quantization. The calculation involving this scale results in a discrete spectrum below the threshold and restores unitarity, making the effects induced by this scale significant for the formation of <em>DDK</em> bound state. In order to establish this in a complete formalism, the paper further gives an analytical expression for the three-body coupling constant, and compares it to the numerical calculation in <em>DDK</em> system.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1053 ","pages":"Article 122970"},"PeriodicalIF":1.7,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142445995","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 nuclear shadowing effect of gluon at small x","authors":"B. Rezaei","doi":"10.1016/j.nuclphysa.2024.122971","DOIUrl":"10.1016/j.nuclphysa.2024.122971","url":null,"abstract":"<div><div>The ratio of nuclear gluon distribution functions <span><math><mi>x</mi><msup><mrow><mi>g</mi></mrow><mrow><mi>A</mi></mrow></msup><mo>/</mo><mi>A</mi><mi>x</mi><mi>g</mi></math></span> in the saturation region at small <em>x</em> (i.e., <span><math><mi>x</mi><mo>≲</mo><msup><mrow><mn>10</mn></mrow><mrow><mo>−</mo><mn>3</mn></mrow></msup></math></span>) for light and heavy nuclei is investigated and compared with the HIJING2.0 model. The moments of the nuclear gluon distribution per nucleon, <span><math><mo>&lt;</mo><msup><mrow><mi>x</mi></mrow><mrow><mi>A</mi></mrow></msup><msub><mrow><mo>&gt;</mo></mrow><mrow><mi>g</mi></mrow></msub><mo>/</mo><mi>A</mi></math></span>, on a wide range of the scale <em>μ</em> with charm contribution are considered and compared with the parametrization groups. The importance of the binding energy for nuclei is also considered.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1053 ","pages":"Article 122971"},"PeriodicalIF":1.7,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142441905","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}