Nuclear Physics A最新文献

{"title":"Impact of nuclear rotation corrections on alpha decay half-lives of superheavy nuclei within 98 ≤ Z ≤ 120","authors":"Theeb Y.T. Alsultan ,&nbsp;Joshua T. Majekodunmi ,&nbsp;Raj Kumar ,&nbsp;Boon Tong Goh ,&nbsp;M. Bhuyan","doi":"10.1016/j.nuclphysa.2023.122784","DOIUrl":"https://doi.org/10.1016/j.nuclphysa.2023.122784","url":null,"abstract":"<div><p>The influence of nuclear rotation on the decay half-lives of superheavy nuclei within the range <span><math><mn>98</mn><mo>≤</mo><mi>Z</mi><mo>≤</mo><mn>120</mn></math></span> is investigated using the axially deformed relativistic Hartree-Bogoliubov theory in the continuum (DRHBc) with the PC-PK1 parameter set. The deduced DRHBc decay energies (with and without the rotation effect) are compared with those calculated from the macroscopic-microscopic WS4 and the available experimental binding energies. Six semi-empirical formulae, such as the Viola-Seaborg formula (VSS), the modified Brown formula (mB1), the semi-empirical relationship based on fission theory (SemFIS2), the Royer formula (R), the Wang formula (Wang) and the modified YQZR formula (MYQZR) are employed to estimate the half-lives of <em>α</em> decay. Among these formulae, the half-live predictions of SemFIS2 are found to gradually deviate from the systematic trend beyond <span><math><msub><mrow><mi>N</mi></mrow><mrow><mi>d</mi></mrow></msub><mo>=</mo><mn>184</mn></math></span>, showing that the probability of undergoing spontaneous fission is less feasible beyond this point. A minimum is observed at <span><math><msub><mrow><mi>N</mi></mrow><mrow><mi>d</mi></mrow></msub><mo>=</mo><mn>184</mn></math></span>, reflecting its neutron shell closure for the mass region considered on the nuclear chart. The results further indicate that, for <span><math><mn>98</mn><mo>≤</mo><mi>Z</mi><mo>≤</mo><mn>104</mn></math></span>, the predictions of all semi-empirical formulae are more closely matched to the available experimental data when the rotation effect is taken into account. However, we have demonstrated that the effect of nuclear rotation gradually reduces as the atomic nucleus becomes heavier.</p></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0375947423001872/pdfft?md5=cc80d1c6be7caab7202209420d24876f&pid=1-s2.0-S0375947423001872-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134655743","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 fast neutron reactions in natural lutetium","authors":"A.M. Savrasov ,&nbsp;O.M. Gorbachenko ,&nbsp;V.M. Morozyuk ,&nbsp;I.M. Kadenko ,&nbsp;V.A. Zheltonozhsky","doi":"10.1016/j.nuclphysa.2023.122788","DOIUrl":"https://doi.org/10.1016/j.nuclphysa.2023.122788","url":null,"abstract":"<div><p>The cross-sections and isomeric ratios of the cross-sections for the reaction ¹⁷⁶Lu(n,<em>γ</em>)<span><math><msup><mrow></mrow><mrow><mn>177</mn><mi>m</mi><mo>,</mo><mi>g</mi></mrow></msup></math></span>Lu were obtained for the first time on a base of experimental and evaluated data with the MCNP simulation of scattered neutron spectra. The cross-sections of the reactions ¹⁷⁵Lu(n,p)¹⁷⁵Yb, ¹⁷⁵Lu(n,<em>α</em>)¹⁷²Tm, and ¹⁷⁶Lu(n,<em>α</em>)¹⁷³Tm were precised at a neutron energy of 14.6±0.3 MeV and used for checking up our cross section determination procedure. The account of scattered neutrons to the nuclear reaction was estimated with the MCNP 4c code and TALYS-1.96, EMPIRE 3.2.3 codes calculations. Even with a proper consideration of scattered neutrom spectra, the ¹⁷⁶Lu(n,<em>γ</em>)<span><math><msup><mrow></mrow><mrow><mn>177</mn><mi>m</mi><mo>,</mo><mi>g</mi></mrow></msup></math></span>Lu reaction cross section appeared rather greater than the calculations with the TALYS, EMPIRE codes and evaluations within the ENDF/B-VIII.0, TENLD-2021, JEFF-3 data bases and libraries.</p></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0375947423001914/pdfft?md5=8e47e4e4af9a2eee578a1901a305b382&pid=1-s2.0-S0375947423001914-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134655744","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":"3-dimensional flow analysis: A novel tool to study the collision geometry and the equation-of-state","authors":"Tom Reichert ,&nbsp;Jan Steinheimer ,&nbsp;Marcus Bleicher","doi":"10.1016/j.nuclphysa.2023.122790","DOIUrl":"https://doi.org/10.1016/j.nuclphysa.2023.122790","url":null,"abstract":"<div><p>We propose to extend the commonly known flow analysis in the transverse <span><math><msub><mrow><mi>p</mi></mrow><mrow><mi>x</mi></mrow></msub></math></span>-<span><math><msub><mrow><mi>p</mi></mrow><mrow><mi>y</mi></mrow></msub></math></span> plane to novel flow coefficients based on the angular distribution in the <span><math><msub><mrow><mi>p</mi></mrow><mrow><mi>x</mi></mrow></msub></math></span>-<span><math><msub><mrow><mi>p</mi></mrow><mrow><mi>z</mi></mrow></msub></math></span> and <span><math><msub><mrow><mi>p</mi></mrow><mrow><mi>y</mi></mrow></msub></math></span>-<span><math><msub><mrow><mi>p</mi></mrow><mrow><mi>z</mi></mrow></msub></math></span> planes. The new flow coefficients, called <span><math><msub><mrow><mi>u</mi></mrow><mrow><mi>n</mi></mrow></msub></math></span> and <span><math><msub><mrow><mi>w</mi></mrow><mrow><mi>n</mi></mrow></msub></math></span> (in addition to <span><math><msub><mrow><mi>v</mi></mrow><mrow><mi>n</mi></mrow></msub></math></span>), turn out to be also highly sensitive to the nuclear Equation-of-State and can be used to explore the EoS in more detail than is possible using only <span><math><msub><mrow><mi>v</mi></mrow><mrow><mi>n</mi></mrow></msub></math></span>. As an example to quantify the effect of the EoS, the Ultra-relativistic Quantum Molecular Dynamics (UrQMD) model is used to investigate 20-30% central Au+Au collisions at E<span><math><mmultiscripts><mrow><mo>=</mo></mrow><mprescripts></mprescripts><mrow><mi>lab</mi></mrow><none></none></mmultiscripts><mn>1.23</mn><mspace></mspace><mi>A</mi></math></span> <!-->GeV.</p></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0375947423001938/pdfft?md5=6746be4385d3302178f40a66b8cd0ea6&pid=1-s2.0-S0375947423001938-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134832581","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":"Investigating the influence of input angular momentum on independence hypothesis in heavy-ion induced fusion reactions","authors":"M. Shariq Asnain ,&nbsp;Manoj Kumar Sharma ,&nbsp;Mohd. Shuaib ,&nbsp;Aquib Siddique ,&nbsp;Ishfaq Majeed Bhat ,&nbsp;B.P. Singh ,&nbsp;R. Prasad","doi":"10.1016/j.nuclphysa.2023.122786","DOIUrl":"https://doi.org/10.1016/j.nuclphysa.2023.122786","url":null,"abstract":"<div><p>The experimental verification of compound nucleus theory has successfully been performed for light ion induced reactions using proton and <em>α</em>-particle beams on different targets. However, such studies using the heavy ion beams are scarce due to the complex nature of heavy ion interaction process. The present work is an attempt to validate the Bohr's independent hypothesis using heavy ion beam of ¹⁸O beam on ¹⁵⁹Tb targets and ¹²C on ¹⁶⁵Ho targets, forming the same compound nucleus ¹⁷⁷Ta. A channel wise analysis of cross section data for evaporation residues produced in ¹⁸O+¹⁵⁹Tb and ¹²C+¹⁶⁵Ho systems has been performed within the framework of statistical model code PACE4 and found to reasonably agree with the experimental data. Further, a comparison of reaction cross section data for the same evaporation residues produced in the two different systems has been found to follow Bohr's compound nucleus hypothesis at relatively higher excitation energies. However, at relatively lower excitation energies, a significant deviation in the measured cross section data of the same residues in the above mentioned systems have been observed and is attributed to the discrepancies in angular momentum values. Such discrepancies are well explained on the basis of input angular momentum involved in the reactions.</p></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0375947423001896/pdfft?md5=89c0a0eb5a836d97f8319ba0ec8464ac&pid=1-s2.0-S0375947423001896-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"92025089","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":"Peripheral reactions and elastic scattering induced by strongly bound, weakly bound and exotic nuclei","authors":"J.E. Testoni,&nbsp;D. Abriola,&nbsp;G.V. Martí","doi":"10.1016/j.nuclphysa.2023.122785","DOIUrl":"https://doi.org/10.1016/j.nuclphysa.2023.122785","url":null,"abstract":"<div><p>A phenomenological study of peripheral reactions induced by strongly bound, weakly bound and exotic projectiles on different targets is presented. A large number of experimental elastic scattering differential cross sections at energies close to the Coulomb barrier is studied on the basis of a simple nuclear optical model potential that depends on a small number of parameters. The derived wave functions, together with the imaginary component of the optical potential, allow the analysis of the radial peripheral absorption density distributions for the different kind of projectiles. These distributions, when appropriately normalized, show a clear correlation with the type of projectile regardless of the involved target and indicate that projectiles more prone to break up show a more peripheral absorption density distribution. This manifests in their magnitude, location and width. The relationship of these variables in the strongly bound group and the weakly bound group are described with a simple exponential function, while the exotic projectiles show two distinct groups, namely the neutron-halo and the proton-halo. For the neutron-halo projectiles such as <span><math><mmultiscripts><mrow><mtext>He</mtext></mrow><mprescripts></mprescripts><none></none><mrow><mn>6</mn></mrow></mmultiscripts></math></span>, <span><math><mmultiscripts><mrow><mtext>Li</mtext></mrow><mprescripts></mprescripts><none></none><mrow><mn>11</mn></mrow></mmultiscripts></math></span> and <span><math><mmultiscripts><mrow><mtext>Be</mtext></mrow><mprescripts></mprescripts><none></none><mrow><mn>11</mn></mrow></mmultiscripts></math></span> there is a notable increment of the radial peripheral absorption density peak and the total reaction cross section as the breakup separation energy decreases. The same relationship is established for the proton-halo projectiles <span><math><mmultiscripts><mrow><mtext>B</mtext></mrow><mprescripts></mprescripts><none></none><mrow><mn>8</mn></mrow></mmultiscripts></math></span> and <span><math><mmultiscripts><mrow><mtext>F</mtext></mrow><mprescripts></mprescripts><none></none><mrow><mn>17</mn></mrow></mmultiscripts></math></span> but their reduced effective dipole charge leads to a lower probability of dipole Coulomb breakup that results in a substantial reduction in the extent of their peripheral absorption.</p></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0375947423001884/pdfft?md5=c7fca3a3d2e00ff535c4a898626451d2&pid=1-s2.0-S0375947423001884-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"92025087","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":"Cluster radioactivity using modified generalized liquid model with a statistical cluster preformation probability","authors":"K.P. Santhosh ,&nbsp;V.K. Anjali","doi":"10.1016/j.nuclphysa.2023.122787","DOIUrl":"https://doi.org/10.1016/j.nuclphysa.2023.122787","url":null,"abstract":"<div><p>The cluster radioactivity of various heavy nuclei have been studied using the modified generalized liquid drop model (MGLDM) with a new statistical cluster preformation probability of Dong et al. [Eur. Phys. J. A 41, 197 (2009)]. The statistical preformation factor obtained obeys the relation for preformation factor or spectroscopic factor, <span><math><mrow><mi>S</mi><mo>=</mo><msubsup><mi>S</mi><mi>α</mi><mrow><mo>(</mo><msub><mi>A</mi><mn>2</mn></msub><mo>−</mo><mn>1</mn><mo>)</mo><mo>/</mo><mn>3</mn></mrow></msubsup></mrow></math></span> of Blendowske et al. [Phys. Rev. Lett. 61, 1930 (1988)] with <span><math><msub><mi>S</mi><mi>α</mi></msub></math></span>=0.063, exactly the same value reported. The predicted half-lives using MGLDM are in agreement with experimental data with standard deviation <span><math><mi>σ</mi></math></span>=1.16 and also consistent with other empirical formula predictions. Predictions on decay modes of nuclei, which are energetically allowed but not yet observed, are also done which will be helpful for scientists to design new experiments on cluster radioactivity.</p></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0375947423001902/pdfft?md5=139a8eccf61ead417d0c845c5e4ecca4&pid=1-s2.0-S0375947423001902-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134656602","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":"(γ, χcJ(J = 0,1)) and (γ, ηc) production in electron-positron annihilation at s=10.6 GeV and 4.6 GeV in the framework of Bethe-Salpeter equation","authors":"Shashank Bhatnagar,&nbsp;Vaishali Guleria","doi":"10.1016/j.nuclphysa.2023.122783","DOIUrl":"https://doi.org/10.1016/j.nuclphysa.2023.122783","url":null,"abstract":"<div><p>In present work we study the production of ground and excited charmonium states in <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><mi>γ</mi><msub><mrow><mi>χ</mi></mrow><mrow><mi>c</mi><mi>J</mi></mrow></msub><mo>(</mo><mi>n</mi><mi>P</mi><mo>)</mo><mo>(</mo><mi>J</mi><mo>=</mo><mn>0</mn><mo>,</mo><mn>1</mn><mo>)</mo></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><mi>γ</mi><msub><mrow><mi>η</mi></mrow><mrow><mi>c</mi></mrow></msub><mo>(</mo><mi>n</mi><mi>S</mi><mo>)</mo></math></span>, through leading order (LO) diagrams, which proceed through exchange of a virtual photon that couples to <em>γ</em> and <span><math><msub><mrow><mi>η</mi></mrow><mrow><mi>c</mi></mrow></msub><mo>/</mo><msub><mrow><mi>χ</mi></mrow><mrow><mi>c</mi><mi>J</mi></mrow></msub></math></span> through the triangular quark loop diagram, in the framework of <span><math><mn>4</mn><mo>×</mo><mn>4</mn></math></span> Bethe-Salpeter equation (BSE), at center of mass energies <span><math><msqrt><mrow><mi>s</mi></mrow></msqrt><mo>=</mo><mn>10.6</mn></math></span> GeV (Belle energy), and 4.6 GeV (BESIII energy). The amplitude simplifies to a general form required by Lorentz-covariance, in terms of its form factors. The cross sections for these processes with leading order diagrams alone at <span><math><msqrt><mrow><mi>s</mi></mrow></msqrt><mo>=</mo><mn>10.6</mn></math></span> GeV provide a sizable contribution, which might be mainly due to the BSE being a fully relativistic approach that incorporates the relativistic effect of quark spins and can also describe internal motion of constituent quarks within the hadron in a relativistically covariant manner. Our results are compared with recent Belle data at 10.6 GeV, and BESIII data at 4.6 GeV, as well as other models. Plots of cross sections versus the center-of mass energy, <span><math><msqrt><mrow><mi>s</mi></mrow></msqrt></math></span> reveal mild fluctuations in their behaviour for all the three processes in the low energy (<span><math><msqrt><mrow><mi>s</mi></mrow></msqrt><mo>=</mo><mn>4</mn><mtext>–</mtext><mn>6</mn></math></span> GeV) region, and are analyzed in terms of the form factors.</p></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0375947423001860/pdfft?md5=50a8f1328826ef6e4069a8423a56dcbe&pid=1-s2.0-S0375947423001860-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"92025088","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":"Shell-model study for 204–210Tl isotopes and core excitations across the Z = 82 and N = 126 shell gaps","authors":"Bharti Bhoy ,&nbsp;Praveen C. Srivastava","doi":"10.1016/j.nuclphysa.2023.122782","DOIUrl":"https://doi.org/10.1016/j.nuclphysa.2023.122782","url":null,"abstract":"<div><p>In the present work, the ^204–210Tl isotopes have been investigated by performing large-scale shell-model calculations, including configurations allowing both neutron and proton core excitations across the <span><math><mi>Z</mi><mo>=</mo><mn>82</mn></math></span> and <span><math><mi>N</mi><mo>=</mo><mn>126</mn></math></span> shell gaps. Inspired by the recent high-spin experimental data, the structure of Tl isotopes has been studied for a considerably large model space. The KHHE interaction has been used for ^204–206Tl isotopes, KHH7B interaction for ^204–210Tl isotopes, and additionally KHM3Y interaction has been used for ²⁰⁸Tl isotope. The core excitation has been performed using the KHH7B and KHM3Y interactions. The level spectra of ^204–210Tl isotopes are comprehensively described and explained by multi-nucleon couplings of single-particle-hole orbitals within the valence space and by core excitations across ²⁰⁸Pb core. The well-known isomeric states are analyzed in terms of the shell model configurations.</p></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0375947423001859/pdfft?md5=1944463d343996785c30ea6b222fb0a1&pid=1-s2.0-S0375947423001859-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"92046160","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":"Measurement of the T20 component of tensor analyzing power for the incoherent π−-meson photoproduction on a deuteron","authors":"V.V. Gauzshtein ,&nbsp;E.M. Darwish ,&nbsp;A.I. Fix ,&nbsp;A.S. Kuzmenko ,&nbsp;M.Ya. Kuzin ,&nbsp;M.I. Levchuk ,&nbsp;A.Yu. Loginov ,&nbsp;D.M. Nikolenko ,&nbsp;I.A. Rachek ,&nbsp;Yu.V. Shestakov ,&nbsp;D.K. Toporkov ,&nbsp;A.V. Yurchenko ,&nbsp;B.I. Vasilishin ,&nbsp;S.A. Zevakov ,&nbsp;G.N. Baranov ,&nbsp;A.V. Bogomyagkov ,&nbsp;V.M. Borin ,&nbsp;V.L. Dorokhov ,&nbsp;A.N. Zhuravlev ,&nbsp;S.E. Karnaev ,&nbsp;E.V. Starostina","doi":"10.1016/j.nuclphysa.2023.122781","DOIUrl":"https://doi.org/10.1016/j.nuclphysa.2023.122781","url":null,"abstract":"<div><p>We present experimental results for <span><math><msub><mrow><mi>T</mi></mrow><mrow><mn>20</mn></mrow></msub></math></span> component of the tensor analyzing power for incoherent <span><math><msup><mrow><mi>π</mi></mrow><mrow><mo>−</mo></mrow></msup></math></span> photoproduction on a deuteron. The experiment was performed on an internal tensor-polarized gas deuterium target of the VEPP-3 electron storage ring in 2021 using the proton-proton coincidence method. The data are compared with the results of numerical simulation.</p></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0375947423001847/pdfft?md5=c482ad6ad7ed911e78e06d24a254ae13&pid=1-s2.0-S0375947423001847-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"92046161","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":"Nuclear Equation of State and many-body phase-space correlations in the Constrained Molecular Dynamics","authors":"M. Papa","doi":"10.1016/j.nuclphysa.2023.122780","DOIUrl":"https://doi.org/10.1016/j.nuclphysa.2023.122780","url":null,"abstract":"<div><p>Many-body correlations characterizing the Constrained Molecular Dynamics (CoMD) are analyzed in the case of finite and zero-range effective microscopic interactions. The study begins by analyzing the case of infinite nuclear matter at zero temperature. A comparison with the predictions in the mean-field (MF) limit corresponding to different effective masses, highlights non-negligible differences regarding the produced Equation of State (EoS). A procedure is illustrated to determine the necessary corrections of the effective interaction parameters in the CoMD model so to reproduce the chosen EoS. The specific model calculations, the general feature of the discussed correlations gives a wider meaning to the resulting differences, which are in fact strongly related both to the Pauli principle constraint and to the localization effects related to wave-packets dynamics. Moving on to finite systems, preliminary results are shown in relation to the reaction mechanisms in the <span><math><mmultiscripts><mrow><mi>N</mi></mrow><mprescripts></mprescripts><none></none><mrow><mn>64</mn></mrow></mmultiscripts><mi>i</mi><msup><mrow><mo>+</mo></mrow><mrow><mn>48</mn></mrow></msup><mi>C</mi><mi>a</mi></math></span> system described by the CoMD model. Therefore, the topic covered illustrates the effects produced by the correlations of the CoMD dynamics on the EoS and on some observables commonly studied in heavy ion collisions.</p></div>","PeriodicalId":19246,"journal":{"name":"Nuclear Physics A","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0375947423001835/pdfft?md5=68c88ec4e33697814a3d462fe2892924&pid=1-s2.0-S0375947423001835-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"92046159","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}