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Nuclear Theory·nucl-th

Friday·July 3, 2026

10 papers—6 primary·4 cross-listed

All10Primary6Cross-lists4
  1. 01

    Nuclear shell evolution near N = 6, 14, 20 and 28: insights from nuclear charge radii of short-lived nuclei derived from binding energies

    Xingquan Liu · Wanjun Chen · Xing Xu · Yi Hua Lam · Hua Zheng · Jianfeng Han · Weiping Lin · Xi Duan · Xin Zhang · Peipei Ren

    A deep understanding of the evolution of nuclear shell structure correlating with the nucleon number is crucial for unraveling the fundamental properties of the nuclear structure and for exploring new nuclear physics phenomena far from the -stability line. Although significant progress has been made in probing nuclear shell evolution via the measurements of nuclear root-mean-square charge radii, , the scarcity of new data for short-lived and exotic nuclei due to the increasing difficulty of measurements presents a formidable challenge in obtaining deeper and more universal insights into the nature of shell evolution. To mitigate this issue, we develop an improved method, accounting for the exchange term, charge-symmetry breaking effect, and odd-even staggering effect in the Coulomb energy formulation compared with that proposed by Liu et al. [Phys. Lett. B 872, 140046 (2026)], to determine unmeasured values. Using the improved method, the values of 59 nuclei are determined from their measured binding energies () and the respective and of their mirror partners. We then systematically study the shell evolution near , 14, 20 and 28 (sub)shells by placing the newly obtained values into the corresponding isotopic chains. More comprehensive insights into the properties of nuclear shell evolution, particularly for the neutron-deficient sectors of the studied shell regions, e.g., , and shells, are acquired, advancing our understanding of nuclear shell evolution in the light and intermediate mass region.

    nucl-thnucl-ex0 citations
  2. 02

    Determining the dynamic deformation of Ce by constraining coupled-channels parameters for fusion

    Chandra Kumar · Rohan Biswas · J. Gehlot · Gonika · A. Parihari · N. Madhavan · A. Vinayak · Amritraj Mahato · S. Nath

    We present a systematic study of the dynamic deformation of 140Ce using 16O and 36S projectiles in heavy-ion fusion reactions, combining experimental data, a Gaussian analytic-barrier framework and coupled-channels calculations. Fusion cross sections for 16O+140Ce are measured from ~17% above to ~12.4% below the Bass barrier. Fusion data for 36S+140Ce are obtained from the literature. Deformation parameters of 140Ce are extracted via chi-square minimization and Bayesian analysis, with independent Bayesian Model Averaging yielding beta_2 = 0.09 +/- 0.03 and beta_3 = 0.18 +/- 0.02, consistent across both systems. The extracted parameters are tested in the 28Si+140Ce system, where coupled-channels calculations including transfer of a pair of neutrons (2n) reproduce both the fusion excitation function and the barrier distribution. The positive Q-value 2n-pickup channel enhances fusion in this reaction, while the projectile's vibrational or rotational nature results in similar structure of the barrier distribution. This study demonstrates that the Gaussian analytic recipe is quite effective in deriving the fusion barrier distribution which proves to be a sensitive probe of intrinsic nuclear deformation. Further, coupled-channels analysis across multiple systems ensures robustness of the extracted deformation parameters.

    nucl-thnucl-ex0 citations
  3. 03

    Dispersive-optical-model analysis of the asymmetry dependence of neutron skins

    R. A. Ramon · M. C. Atkinson · W. H. Dickhoff

    New dispersive optical model analyses of Fe and Zr together with updated results for Ca, Ca, and the earlier result for Pb shed light on the behavior of neutron skins in nuclei. Starting with a negative skin for Ca, a trend increasing somewhat stronger than linear emerges when the neutron skin of these nuclei is considered as a function of asymmetry, , and linked to the Green's function Monte Carlo results for asymmetric He nuclei. This general trend is consistent with the expectation that nuclei near the neutron drip line are expected to have very large neutron skins. The present analysis therefore motivates the question of which nuclei provide the most relevant link to neutron star physics.

    nucl-th0 citations
  4. 04

    Quasiparticle structure and -decay scheme of nuclei along alpha-decay chain of Mc

    L.A.Malov · N.Yu.Shirikova · A.N.Bezbakh · E.A.Kolganova · R.V.Jolos

    Recent experiments on -decay of odd-odd superheavy nuclei give an important information on the structure of the low-lying states of these nuclei. For this reason it is interesting to calculate the excitation spectra of these superheavy nuclei and compare the results with the experimental data. The aim of this work is to calculate the excitation energies of the two-quasiparticle states of nuclei belonging to the -decay chain of Mc. The approximation of the noninteracting quasiparticles based on the Woods-Saxon single particle potentials is used. Different sets of deformation parameters are considered. The spectra of the low-lying two-quasiparticle states are calculated. The -decay spectra of nuclei belonging to the -decay chain of Mc are obtained and compared with the experimental data. A possibility of the transitions in Mt and Bh following -decay of Mc is considered. It is shown that the E1 transitions in Mt can be related to the transition . In Bh the transition can be related to the neutron single quasiparticle states.

    nucl-thPRC(2026)·1 citation
  5. 05

    Probing hot QCD medium with heavy quarkonium in small and large collision systems

    Jiamin Liu🇨🇳 · Baoyi Chen🇨🇳

    The yield ratios of different heavy-quarkonium states serve as sensitive probes of final-state interactions in relativistic nuclear collisions, because common cold-nuclear-matter effects are expected to be substantially reduced in these ratios. To quantify hot QCD medium effects in small collision systems, such as proton-nucleus collisions, we employ a time-dependent Schrodinger equation framework to consistently simulate the real-time evolution of both bottomonium and charmonium states in the presence of in-medium complex heavy-quark potentials. In p-Pb collisions at sqrt(sNN) = 8.16 TeV, our model successfully describes the observed suppression in the yield ratios of excited-to-ground states, specifically Upsilon(nS)/Upsilon(1S) and psi(2S)/J/psi, as a function of charged-particle multiplicity. This agreement supports the formation of a transient, hot QCD medium in small systems. Furthermore, the framework is employed to study the ratio of bottomonium nuclear modification factors in sqrt(sNN) = 5.02 TeV Pb-Pb collisions, where hot medium effects become stronger. By establishing a unified description across two distinct heavy-quark flavors and different collision systems, our study indicates that the yield ratio of bottomonium states serves as a comparatively clean probe of the hot QCD medium generated in small collision systems.

    nucl-th0 citations
  6. 06

    Scaling Laws for Three-Body Nuclear Contacts

    Raz Yankovich · Ehoud Pazy · Nir Barnea

    Three-nucleon short-range correlations (3N-SRCs) represent one of the least understood manifestations of short-range nuclear dynamics. We investigate these correlations within the generalized contact formalism and compute three-body nuclear contacts using a mean-field description of the long-range component of the nuclear wave function. These contacts quantify the probability of finding correlated nucleon triplets at short distances and provide a natural extension of the contact formalism beyond nucleon pairs. We find that the He and H contacts exhibit significant isospin-symmetry breaking, analogous to that observed previously for two-body contacts. Motivated by the semi-empirical mass formula, we derive a simple scaling relation for three-body contacts and show that it accurately reproduces the calculated values across medium-mass and heavy nuclei. Our results reveal a systematic dependence of 3N-SRCs on nuclear mass and composition, suggesting that three-body contacts obey universal scaling patterns closely analogous to those governing short-range-correlated nucleon pairs.

    nucl-th0 citations

Affiliations

first authorsco-authorsvia INSPIRE