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Nuclear Theory·nucl-th

Monday·March 31, 2025

13 papers—5 primary·8 cross-listed

All13Primary5Cross-lists8
  1. 01

    Level-anticrossing in B(E2) anomaly (I)

    Tao Wang · Yu-xin Cheng · Dong-kang Li · Xiao-shen Kang · Suo-chang Jin · Tie Wang · Zhi-qi Zhang · Cheng-guang Zhang · Zhi-xin Zhang

    Recently, a new mechanism for explaining the B(E2) anomaly was given by F. Pan \emph{et al.} (PRC, 110, 054324, 2024), which is realized in the parameter region from the SU(3) symmetry limit to the O(6) symmetry limit, and seems to be not related to the SU(3) symmetry. However, through SU(3) analysis, a new technique proposed recently, we found that it is not so. The new mechanism is related to level-anticrossing phenomenon, which is related to level-crossing phenomenon in the SU(3) symmetry limit. By incorporating previous ideas, we have a more general explanatory framework for the B(E2) anomaly, which is important for understanding some higher-order interactions in the interacting boson model. Through analysis, it is shown that level-anticrossing in this mechanism mainly results from the third-order interaction . Finally, the B(E2) anomaly in Os is also discussed within this general framework.

    nucl-thnucl-exquant-ph7 citations
  2. 02

    Analysis of the contribution of resonance poles of O based on the Mittag-Leffler theorem within the Jost-RPA framework

    K. Mizuyama · T. Dieu Thuy

    This study investigates resonance states in O, specifically the 1 giant resonance and isoscalar/isovector quadrupole resonances, using the Jost-RPA method. By applying the Mittag-Leffler theorem, we decompose the RPA response function to analyze the individual contributions from poles corresponding to collective excitation modes. This decomposition clarifies the role of each pole in shaping the strength function, providing insights into the nature and classification of resonance states essential for understanding collective nuclear excitations. Our analysis identifies the dominant pole contributions to the observed resonance structures, offering a novel approach for exploring collective excitation phenomena in nuclei with complex many-body correlations.

    nucl-thPRC(2025)·3 citations
  3. 03

    Comment on "Evaluation of kinetic freeze-out properties in different relativistic heavy-ion collision systems at \sqrtsNN = 200 GeV'' (Eur. Phys. J. Plus (2025) 140:179) https://doi.org/10.1140/epjp/s13360-025-06119-0

    M. U. Ashraf

    The comment raises serious concerns regarding the authors claims about the phase transition from the QGP phase to the hadron gas phase. Additionally, the comment critiques the fundamental distinction between the kinetic freeze-out temperature and the critical temperature, as the authors erroneously treat them as identical in their article. The authors also assert that the critical temperature is system dependent which contradicts established lattice QCD calculations. Furthermore, there are flaws in their handling of data uncertainties, which could significantly affect the quality of the fit. Furthermore, they misrepresent AMPT-simulated data as experimental data, which undermines the validity of their analysis. Flaws in their handling of data uncertainties also cast doubt on the robustness of their fits.

    nucl-thhep-phEur.Phys.J.Plus(2025)·1 citation
  4. 04

    Superheavy Nuclei and the Changing Face of Nuclear Magicity

    Jeet Amrit Pattnaik · Santosh Kumar · S. K. Singh · R. N. Panda · M. Bhuyan · S. K. Patra

    Using a relativistic mean field formalism, we analyzed the magic number sequence for finite nuclei in the superheavy valley. The result for the IOPB-I parameter set is compared with the well-known NL3 force. The magic numbers obtained from IOPB-I and NL3 interactions are found to be similar. Analysing the single-particle levels and the number of nucleons occupied in it, we find the close shell sequence as 2, 8, 18, 34, 50, 58, 80, 82, 92, 114, 120, 120, 138, 164, 172, 184 and 198 for the mass region. Again, with a careful inspection, we noticed large shell gaps at nucleon numbers 2, 8, 18, 34, 50, 58, 80, 92, 120, 138, 164, 172, 184, and 198, which may be considered as the magic number sequence for the superheavy nuclei. This change may be due to the shape change of the nuclear potential as compared to the stability valley.

    nucl-th0 citations
  5. 05

    Effects of perturbation for transition operator of double- decay on nuclear matrix element, effective axial-vector current coupling, and half-life

    J. Terasaki🇨🇿 · O. Civitarese🇦🇷

    We calculate the nuclear matrix element (NME), effective axial-vector current coupling , and half-life of the double- () decay using the transition operator perturbed by the nuclear interaction. The correction terms for the NME are obtained by extending the hadron sector to a higher order in terms of the Rayleigh-Schrödinger perturbation theory. The NME calculations are performed for the neutrinoless () and the two-neutrino () decays of Xe. The nuclear wave functions are calculated by the quasiparticle random-phase approximation (QRPA) with the Skyrme, the Coulomb, and the contact pairing interactions. Sufficiently large single-particle valence spaces are used. The correction terms for the NME are comparable with the leading term in absolute value, and the sum of the corrections has the opposite sign to that of the leading term. The 's for the NME are calculated by a few methods depending on the truncation of the NME and the half-life referred to. Similarities are found between some of these 's including those of the NME. This leads to the conclusion that the value of can indeed be determined by the perturbed transition operator. It is in a comparable range of the for the NME. The perturbation effect on the half-life is discussed by comparing the calculated half-lives with the different 's and the NME components.

    nucl-thhep-thnucl-exPRC(2025)·3 citations

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first authorsco-authorsvia INSPIRE