Nuclear Physics A最新文献

{"title":"(J/ψ,J/ψ), and (ηc,ηc) production through two intermediate photons in electron-positron annihilation at B-factories","authors":"Shashank Bhatnagar ,&nbsp;Hluf Negash","doi":"10.1016/j.nuclphysa.2024.122969","DOIUrl":"10.1016/j.nuclphysa.2024.122969","url":null,"abstract":"<div><div>We study the processes, <span><math><msup><mrow><mi>e</mi></mrow><mrow><mo>−</mo></mrow></msup><msup><mrow><mi>e</mi></mrow><mrow><mo>+</mo></mrow></msup><mo>→</mo><msup><mrow><mi>γ</mi></mrow><mrow><mo>⁎</mo></mrow></msup><msup><mrow><mi>γ</mi></mrow><mrow><mo>⁎</mo></mrow></msup><mo>→</mo><mi>J</mi><mo>/</mo><mi>ψ</mi><mo>+</mo><mi>J</mi><mo>/</mo><mi>ψ</mi></math></span>, and <span><math><msup><mrow><mi>e</mi></mrow><mrow><mo>−</mo></mrow></msup><msup><mrow><mi>e</mi></mrow><mrow><mo>+</mo></mrow></msup><mo>→</mo><msup><mrow><mi>γ</mi></mrow><mrow><mo>⁎</mo></mrow></msup><msup><mrow><mi>γ</mi></mrow><mrow><mo>⁎</mo></mrow></msup><mo>→</mo><msub><mrow><mi>η</mi></mrow><mrow><mi>c</mi></mrow></msub><mo>+</mo><msub><mrow><mi>η</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span> at <span><math><msqrt><mrow><mi>s</mi></mrow></msqrt><mo>=</mo><mn>10.6</mn></math></span> GeV in the framework of <span><math><mn>4</mn><mo>×</mo><mn>4</mn></math></span> Bethe-Salpeter equation. For <span><math><mi>J</mi><mo>/</mo><mi>ψ</mi><mo>+</mo><mi>J</mi><mo>/</mo><mi>ψ</mi></math></span> production, the dominant contribution is through fragmentation process, while for <span><math><msub><mrow><mi>η</mi></mrow><mrow><mi>c</mi></mrow></msub><mo>+</mo><msub><mrow><mi>η</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span> production, the quark rearrangement diagrams contribute. Our results of cross section for <span><math><mi>J</mi><mo>/</mo><mi>ψ</mi><mo>+</mo><mi>J</mi><mo>/</mo><mi>ψ</mi></math></span> and <span><math><mi>ψ</mi><mo>(</mo><mn>2</mn><mi>S</mi><mo>)</mo><mo>+</mo><mi>ψ</mi><mo>(</mo><mn>2</mn><mi>S</mi><mo>)</mo></math></span> are compatible with the experimental upper limits set by Belle Collaboration, while in the absence of experimental data for <span><math><msub><mrow><mi>η</mi></mrow><mrow><mi>c</mi></mrow></msub><mo>(</mo><mn>1</mn><mi>S</mi><mo>)</mo><mo>+</mo><msub><mrow><mi>η</mi></mrow><mrow><mi>c</mi></mrow></msub><mo>(</mo><mn>1</mn><mi>S</mi><mo>)</mo></math></span>, and <span><math><msub><mrow><mi>η</mi></mrow><mrow><mi>c</mi></mrow></msub><mo>(</mo><mn>2</mn><mi>S</mi><mo>)</mo><mo>+</mo><msub><mrow><mi>η</mi></mrow><mrow><mi>c</mi></mrow></msub><mo>(</mo><mn>2</mn><mi>S</mi><mo>)</mo></math></span> production, we have given theoretical prediction of their cross sections, and compared with NRQCD prediction.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1053 ","pages":"Article 122969"},"PeriodicalIF":1.7,"publicationDate":"2024-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142441904","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":"Quasi-stationary alpha-states from non-Hermitian Hamiltonians of even-even heavy isotones","authors":"Réka Szilvási,&nbsp;István Andorfi,&nbsp;Dániel P. Kis","doi":"10.1016/j.nuclphysa.2024.122968","DOIUrl":"10.1016/j.nuclphysa.2024.122968","url":null,"abstract":"<div><div>Three isotone groups (N=128,130,132) with alpha-decaying, short-lifetime even-even nuclei of large mass number are studied in order to show that the tunneling phase of the alpha decay process is appropriately describable by a specific non-hermitian mean-field model. In this model the mean-field lifetime of the alpha cluster is extracted directly by the complex diagonalization of the non-hermitian Hamiltonian of the system. In this paper, we demonstrate that by calculating the mean-field width of the alpha clusters, in each isotone groups, by non-perturbative complex spectral calculations, then, due to the distinct patterns the isotones are naturally organized into with respect to the half-life and proton number, the total width of the alpha-decay can be approximated by matching the calculated results to experimental data.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1053 ","pages":"Article 122968"},"PeriodicalIF":1.7,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142441906","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":"Alpha spectroscopy of purified beams of exotic nuclei at the FRS Ion Catcher","authors":"Nazarena Tortorelli ,&nbsp;Moritz Pascal Reiter ,&nbsp;Ann Kathrin Rink ,&nbsp;Sivaji Purushothaman ,&nbsp;Samuel Ayet San Andrés ,&nbsp;Julian Bergmann ,&nbsp;Timo Dickel ,&nbsp;Marcel Diwisch ,&nbsp;Jens Ebert ,&nbsp;Hans Geissel ,&nbsp;Florian Greiner ,&nbsp;Emma Haettner ,&nbsp;Christine Hornung ,&nbsp;Aleksandra Kelic-Heil ,&nbsp;Ronja Knoebel ,&nbsp;Wayne Lippert ,&nbsp;Ivan Miskun ,&nbsp;Iain D. Moore ,&nbsp;Stephane Pietri ,&nbsp;Wolfgang R. Plaß ,&nbsp;Xiaodong Xu","doi":"10.1016/j.nuclphysa.2024.122967","DOIUrl":"10.1016/j.nuclphysa.2024.122967","url":null,"abstract":"<div><div>The FRS Ion Catcher (FRS-IC) is located at the final focal plane of the Fragment Separator FRS at GSI. The FRS-IC setup is well known for high-precision experiments with stopped exotic nuclei produced by projectile fragmentation and fission. The facility consists of the cryogenic gas-filled stopping cell (CSC), an RFQ-based beamline (DISTRICT), and a multiple-reflection time-of-flight mass spectrometer (MR-TOF-MS). This paper illustrates how alpha spectroscopy performed at this facility has emerged as a promising tool to unveil the nuclear structure of exotic nuclei, i.e., half-live and decay energy measurements. First studies of that kind were performed on the decay chains of ²¹⁸Rn, ²¹⁹Rn, ²²¹Ac, ²²⁰Fr, and ^223,224Th produced by projectile fragmentation of ²³⁸U. The <em>α</em> decay energy measurements performed and the deduced Q_<em>α</em> values confirm the known maximum at N=128 and the values of Q_<em>α</em> at N<span><math><mo>=</mo><mn>132</mn><mo>−</mo><mn>133</mn></math></span> follow the predicted increasing in Q_<em>α</em> values compared to the values for At isotopes at the same neutron number N. Further, the production rate ratio of the isomer to the ground state of ²¹¹Po was measured. It allows an estimate of the angular momentum distribution of ²¹¹Po fragments following fragmentation of ²³⁸U in a ⁹Be target at relativistic energies. In addition, the potential of mass-selected decay spectroscopy behind the MR-TOF-MS was demonstrated with short-lived ²¹⁵Po ions (<span><math><msub><mrow><mi>t</mi></mrow><mrow><mn>1</mn><mo>/</mo><mn>2</mn></mrow></msub><mo>=</mo><mn>1.78</mn></math></span> ms). This demonstrates that the FRS-IC is a reliable setup for <em>α</em> spectroscopy studies and related nuclear structure studies.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1053 ","pages":"Article 122967"},"PeriodicalIF":1.7,"publicationDate":"2024-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142432765","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":"Erratum to “Localization of peripheral reactions and sensitivity to the imaginary potential” [Nucl. Phys. A 1006 (2021) 122109]","authors":"Imane Moumene ,&nbsp;Angela Bonaccorso","doi":"10.1016/j.nuclphysa.2024.122966","DOIUrl":"10.1016/j.nuclphysa.2024.122966","url":null,"abstract":"<div><div>We have found a typo mistake in the code used to obtain the double folding results discussed in the above paper. However the single folding results were unaffected as they were calculated with a different code.</div><div>The correct code provides values bringing the double folding and the single folding results closer to each other at an incident energy around 60 A.MeV, as it can be seen in <span><span>Table 1</span><svg><path></path></svg></span> and <span><span>Figs. 1 and 2</span><svg><path></path></svg></span> presented in the following. However the main conclusions of the paper are qualitatively unaffected because the single folding model still provides larger reaction cross sections and strong absorption radii indicating the important effect of surface absorption. This is particularly true in the high energy case for which there are also data shown in the four panels of <span><span>Fig. 3</span><svg><path></path></svg></span> where the energy dependence of the reaction cross section for four different projectiles is studied comparing data with the single folding and double folding results. There are only a few small projectile cases shown in <span><span>Table 1</span><svg><path></path></svg></span> for which the single folding provides smaller cross sections and strong absorption radii than the double folding.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1053 ","pages":"Article 122966"},"PeriodicalIF":1.7,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142427521","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":"Sub-Coulomb breakup of 6Li (→α+d) off 209Bi target","authors":"D. Chattopadhyay ,&nbsp;S. Santra ,&nbsp;A. Pal ,&nbsp;A. Kundu ,&nbsp;K. Ramachandran ,&nbsp;R. Tripathi ,&nbsp;S. Kailas","doi":"10.1016/j.nuclphysa.2024.122965","DOIUrl":"10.1016/j.nuclphysa.2024.122965","url":null,"abstract":"<div><div>Cross section for dissociation of ⁶Li into <em>α</em>+<em>d</em> in the field of ²⁰⁹Bi target nucleus has been measured at an energy about 20% below the Coulomb barrier by detecting <em>α</em> and <em>d</em> in coincidence using a segmented Si-Strip detector array. Measured distribution of relative energy ‘<span><math><msub><mrow><mi>E</mi></mrow><mrow><mi>α</mi><mi>d</mi></mrow></msub></math></span>’ suggests that the dissociation of the projectile at present beam energy proceeds dominantly through direct breakup and by a small fraction through sequential breakup via 3⁺ resonance state. The Q-value distribution shows that the events are accompanied by the residual target nuclei remaining at the ground state. Measured angular distributions of direct breakup cross-section are analyzed within the framework of Continuum Discretized Coupled Channel (CDCC) calculations. Asymptotic Normalization Coefficient (ANC) describing the amplitude of the tail of the bound state wave function in <em>α</em>+dis obtained from the variation of spectroscopic amplitude with the Single particle asymptotic normalization coefficient. The estimated ANC parameter (2.581 ± 0.212 fm^−1/2) is in excellent agreement with the values previously found in the literature.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1053 ","pages":"Article 122965"},"PeriodicalIF":1.7,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142318991","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":"Nucleation of baryons in relativistic hadron-nucleus collisions","authors":"A. Ergun ,&nbsp;N. Buyukcizmeci ,&nbsp;A. Kittiratpattana ,&nbsp;T. Reichert ,&nbsp;A.S. Botvina ,&nbsp;M. Bleicher","doi":"10.1016/j.nuclphysa.2024.122964","DOIUrl":"10.1016/j.nuclphysa.2024.122964","url":null,"abstract":"<div><div>We suggest a new theoretical method to describe the baryon clusterization of nuclei in hadron-nucleus reactions. As an example we have explored the nuclei production in <span><math><msup><mrow><mi>π</mi></mrow><mrow><mo>−</mo></mrow></msup><mo>+</mo><mi>C</mi></math></span> and <span><math><msup><mrow><mi>π</mi></mrow><mrow><mo>−</mo></mrow></msup><mo>+</mo><mi>W</mi></math></span> collisions at p<span><math><msub><mrow></mrow><mrow><mi>l</mi><mi>a</mi><mi>b</mi></mrow></msub></math></span>=1.7 GeV by using the hybrid approach consisting of the Ultra Relativistic Quantum Dynamics Model (UrQMD) and the Statistical Multifragmentation Model (SMM). The UrQMD describes the production of new baryons, and the propagation toward the subnuclear densities with the fluctuations leading to the formation of excited baryonic clusters. The SMM describes the production of final nuclei and hypernuclei after interaction of baryons inside these clusters. We demonstrate the transverse momenta, rapidity, mass distributions and excitation energies of both primary clusters and final nuclei (including hypernuclei). The results of the UrQMD and UrQMD+SMM model calculations for different clusterization parameters are compared with the available HADES experimental data on baryon production, providing a very promising window for future research on nuclei and hypernuclei formation in these reactions.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1053 ","pages":"Article 122964"},"PeriodicalIF":1.7,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142318992","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":"Normalized factorial moments of spatial distributions of particles in high multiplicity events: A Toy model study","authors":"Sheetal Sharma,&nbsp;Salman K. Malik,&nbsp;Zarina Banoo,&nbsp;Ramni Gupta","doi":"10.1016/j.nuclphysa.2024.122963","DOIUrl":"10.1016/j.nuclphysa.2024.122963","url":null,"abstract":"<div><div>In ultra-relativistic heavy-ion collisions a strongly interacting complex system of quarks and gluons is formed. The nature of the system so created and the mechanism of multi-particle production in these collisions may be revealed by studying the normalized factorial moments (<span><math><msub><mrow><mi>F</mi></mrow><mrow><mi>q</mi></mrow></msub></math></span>) as function of various parameters. <span><math><msub><mrow><mi>F</mi></mrow><mrow><mi>q</mi></mrow></msub></math></span> moments are observed to be sensitive to the presence of dynamical fluctuations. Further, the resilience of these moments, studied using Toy model events, shows their robustness against the uniform efficiency in the data measurements.</div></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1053 ","pages":"Article 122963"},"PeriodicalIF":1.7,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0375947424001453/pdfft?md5=824766a7bc5f0e766b2ed9db4158e294&pid=1-s2.0-S0375947424001453-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142316270","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":"Candidate-nuclei for observation of a bound dineutron. Part II: The (n,2n + n) and (γ,2n) nuclear reactions","authors":"N. Dzysiuk,&nbsp;I.M. Kadenko","doi":"10.1016/j.nuclphysa.2024.122961","DOIUrl":"10.1016/j.nuclphysa.2024.122961","url":null,"abstract":"<div><p>This is a second part of a survey for stable isotopes in the mass range 90 &lt; A &lt; 210, to find candidates showing the bound dineutron nuclear reaction output channel after irradiation with neutrons or photons. To this end, the neutron capture reaction cross sections were calculated in the (0 - 30) MeV energy range with the TALYS-2.0 code for nuclei in the outgoing channel, which are expected to host bound dineutrons. This study was performed to find appropriate candidates to observe bound dineutron decay meeting the criteria based on the (<em>n</em>, <em>γ</em>) resonance cross section analysis. This study opens up a new direction in dineutron research with the (<em>n</em>, <span><math><mmultiscripts><mrow><mi>n</mi></mrow><mprescripts></mprescripts><none></none><mrow><mn>2</mn></mrow></mmultiscripts></math></span>+<em>n</em>) and (<em>γ</em>, <span><math><mmultiscripts><mrow><mi>n</mi></mrow><mprescripts></mprescripts><none></none><mrow><mn>2</mn></mrow></mmultiscripts></math></span>) nuclear reactions.</p></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1053 ","pages":"Article 122961"},"PeriodicalIF":1.7,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S037594742400143X/pdfft?md5=c0797f6da45c4dbe41d258c48bbdadd4&pid=1-s2.0-S037594742400143X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142271807","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":"Entanglement entropy approach for examining quantum phase transition in the framework of semiclassical approximation: Testing its validity in Casten triangle","authors":"M. Ghapanvari ,&nbsp;M.A. Jafarizadeh ,&nbsp;M. Sayedi ,&nbsp;N. Amiri","doi":"10.1016/j.nuclphysa.2024.122960","DOIUrl":"10.1016/j.nuclphysa.2024.122960","url":null,"abstract":"<div><p>The entanglement entropy of <em>s</em> and <em>d</em> bosons in the framework of Interacting Boson Model -1 (IBM-1) has been obtained using consistent-Q formalism and semiclassical approximation. This has been possible by using Schmidt decomposition and expressing <em>s</em> and <em>d</em> bosons entanglement entropy in terms of Schmidt numbers. In this research, a simple method in the framework of IBM-1 has been presented for deriving the entanglement entropy in the Casten triangle. The results indicated that the entanglement entropy is sensitive to the shape-phase transition in the various regions of the Casten triangle. It was demonstrated that the entanglement entropy of <em>s</em> and <em>d</em> bosons in the semiclassical approximation depends only on the values of the deformation parameter (<em>β</em>) and is independent of the angular parameter (<em>γ</em>). Also, the entanglement entropy between <em>s</em> and <em>d</em> bosons reaches its maximum value in the <span><math><mi>O</mi><mo>(</mo><mn>6</mn><mo>)</mo></math></span> limit, while it decreases in the <span><math><mi>S</mi><mi>U</mi><mo>(</mo><mn>3</mn><mo>)</mo></math></span> limit, and reaches zero in the <span><math><mi>U</mi><mo>(</mo><mn>5</mn><mo>)</mo></math></span> limit. Based on the results obtained via Schmidt decomposition, it is shown that the probability distribution functions of the number of <em>s</em> bosons in IBM-1 are the binomial distributions. For <span><math><msub><mrow><mi>N</mi></mrow><mrow><mi>B</mi></mrow></msub><mo>≫</mo><mn>1</mn></math></span>, it was proved that the distribution function in the <span><math><mi>S</mi><mi>U</mi><mo>(</mo><mn>3</mn><mo>)</mo></math></span>, <span><math><mi>O</mi><mo>(</mo><mn>6</mn><mo>)</mo></math></span> and <span><math><mover><mrow><mi>S</mi><mi>U</mi><mrow><mo>(</mo><mn>3</mn><mo>)</mo></mrow></mrow><mo>‾</mo></mover></math></span> limits is the Gaussian, and in the <span><math><mi>U</mi><mo>(</mo><mn>5</mn><mo>)</mo></math></span> limit is the Poissonian.</p></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1053 ","pages":"Article 122960"},"PeriodicalIF":1.7,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0375947424001428/pdfft?md5=9c586631e41302b09f08ceee65702562&pid=1-s2.0-S0375947424001428-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142238233","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":"Fission fragment spectroscopy of 235U(nth,f)","authors":"Aniruddha Dey ,&nbsp;D.C. Biswas ,&nbsp;A. Chakraborty ,&nbsp;S. Mukhopadhyay ,&nbsp;A.K. Mondal ,&nbsp;B. Mukherjee ,&nbsp;G. de France ,&nbsp;G. Simpson ,&nbsp;C.A. Ur ,&nbsp;W. Urban","doi":"10.1016/j.nuclphysa.2024.122962","DOIUrl":"10.1016/j.nuclphysa.2024.122962","url":null,"abstract":"<div><p>Simultaneous measurements of the relative fission fragment charge and mass yield distributions have been performed for the even-even fission fragments produced from the reaction, ²³⁵U(<span><math><msub><mrow><mi>n</mi></mrow><mrow><mi>t</mi><mi>h</mi></mrow></msub></math></span>,<em>f</em>). The measurements have been carried out using the conventional fission fragment spectroscopic technique. The extracted results are interpreted on the basis of the Multi-Modal Random Neck Rupture Model (MM-RNRM). The results from the analysis bring out the necessary experimental evidence for the influence of the deformed proton shell closures at <em>Z</em> = 52 and ∼ 56 along with the neutron shell closures at <em>N</em> = 82 (spherical) and 88 (deformed) in controlling the respective S1 and S2 fission modes occurring in the heavier group of asymmetric fission fragments. The new findings from the present investigation provide the crucial inputs for understanding the features of different fission modes that persist in the low-energy fission dynamics of the lighter actinides. The pair wise neutron multiplicity distribution profiles for the five correlated fission fragment pairs have been presented, and the corresponding extracted neutron multiplicity values are also reported.</p></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":"1053 ","pages":"Article 122962"},"PeriodicalIF":1.7,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0375947424001441/pdfft?md5=6ff53ad955ffaef39515e34c396f0a7f&pid=1-s2.0-S0375947424001441-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142238363","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}