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Nuclear Theory·nucl-th

Monday·December 29, 2025

20 papers—7 primary·13 cross-listed

All20Primary7Cross-lists13
  1. 01

    Spontaneous fission half-lives for heavy and super-heavy nuclei from phenomenological models

    Yi Xie · Ning Wang · Zhongzhou Ren

    A phenomenological model is proposed for a systematic description of the spontaneous fission (SF) half-lives of heavy and super-heavy nuclei. Based on the effective tunneling barrier (ETB), the proposed approach reproduces the SF half-lives of 79 known nuclei with an average deviation of 0.8, which is smaller than that of the linear correlation approach recently proposed in [N. S. Moiseev, N. V. Antonenko and G. G. Adamian, Phys. Rev. C 112, 034607 (2025)]. For superheavy nuclei with , the predicted SF half-lives from these two different phenomenological models are in good agreement with each other. The ETB calculations implies that the -decay energy affects the SF half-lives of nuclei far from the -stability line. For superheavy nuclei around the magic number , the predicted of 120 is much shorter than that of Fl. With predicted values of about ms for , the unmeasured SHN could survive for long enough to reach the focal-plane detector in detection systems like the gas-filled recoil separator SHANS in Lanzhou.

    nucl-thCPC(2026)·1 citation
  2. 02

    Model-Independent Bound on Neutrino Energy Reconstruction from Nuclear Targets

    Sanjeev Kumar Verma🇮🇳

    Neutrino energy reconstruction on nuclear targets underlies oscillation measurements and precision tests of weak interactions. Inclusive charged--current data have long exhibited degeneracies commonly attributed to axial-mass tuning, multinucleon dynamics, and final-state interactions. This work shows that, even in the idealized limit of perfect detectors and exact nuclear dynamics, inclusive lepton-only reconstruction admits no unique inverse. A strictly positive lower bound on neutrino energy resolution follows from the finite energy-transfer support of the inclusive nuclear axial response. The result identifies an irreducible contribution to reconstruction uncertainty that is independent of modeling assumptions and experimental resolution.

    nucl-thhep-ph0 citations
  3. 03

    Pre-Supernova (Anti)Neutrino Emission Due to Weak-Interaction Reactions with Hot Nuclei

    Alan A. Dzhioev🇷🇺 · Andrey V. Yudin🇷🇺 · Natalia V. Dunina-Barkovskaya🇷🇺 · Andrey I. Vdovin🇷🇺

    Reliable predictions of (anti)neutrino spectra and luminosities are essential for assessing the feasibility of detecting pre-supernova neutrinos. Using the stellar evolution code MESA, we calculate the (anti)neutrino spectra and luminosities under realistic conditions of temperature, density, and electron fraction. Our study includes (anti)neutrinos produced by both thermal processes and nuclear weak-interaction reactions. By comparing the results of the thermal quasiparticle random-phase approximation with the standard technique based on the effective -value method, we investigate how thermal effects influence the spectra and luminosities of emitted (anti)neutrinos. Our findings show that a thermodynamically consistent treatment of Gamow--Teller transitions in hot nuclei enhances both the energy luminosity and the average energies of the emitted (anti)neutrinos.

    nucl-thastro-ph.HEParticles(2025)·4 citations
  4. 04

    Shell effects in quasifission toward : insights into fission asymmetric modes

    Yingge Huang · Haozhao Liang · Jun Su

    Background: Experiment of 180Hg fission revealed a possible ``new asymmetric fission mode'' in the preactinide region, posing challenges to current fission theory. Similarity on shell effects are observed between fission and quasifission, providing possibility for widely exploring the topography of fission potential-energy surface (PES). Purpose: We aim to investigate the shell effects in the quasifission forming 180Hg and to explore their connection with the 180Hg fission. Method: 68Zn+112Sn, 74Se+106Pd, 80Kr+100Ru, and 84Kr+96Ru central collisions at different energies and projectile orientations are calculated using the Skyrme time-dependent Hartree-Fock approach. The static fission properties are calculated with the constrained Hartree-Fock-Bogoliubov method and compared with the quasifission results. Results: Shell effects are found to hinder mass equilibration between the prefragments, enhancing the production of fragments near the 80/100 mass split. By comparing the quasifission trajectories with the PES in the space, the role of PES ridge in forming fragments is identified. The presence of asymmetric valley causes the 68Zn+112Sn quasifission exhibits prefragment mass equilibration process and scission-point configuration similar to those of fission. The elongated light fragment is found to be a key factor in reproducing the experimental fission total kinetic energies. Meanwhile, a more pronounced proton shell gap is found in the 68Zn+112Sn quasifission compared with other reactions. Conclusions: By using quasifission dynamics as a probe of the fission pathway, the present calculations help clarify the specific influence of the PES topography and provide support for the dominance of proton shell effects and light fragment deformation in preactinide fission.

    nucl-thPRC(2026)·0 citations
  5. 05

    Nucleon momentum distributions of complex nuclei from inclusive electron scattering

    Tongqi Liang · Dong Bai · Zhongzhou Ren

    Nucleon momentum distributions (NMDs) reveal essential information about Fermi motion and short-range correlations (SRCs). In extracting NMDs from inclusive electron scattering data, theoretical analyses, such as the scaling analysis, are typically employed. For complex nuclei, consistently treating the excitation energy of the residual system is a complicated task, leading to discrepancies between existing extracted NMDs and ab initio calculations, particularly around the Fermi momentum . To address this issue, we introduce an improved description of the excitation energy in the framework of the relativistic Fermi gas (RFG) model. With this treatment, the extracted NMDs of complex nuclei show better agreement with ab initio calculations across the low- and high-momentum range, especially around , successfully reproducing both the behaviors of Fermi motion and SRCs. These results provide a new experimental perspective on the interplay between Fermi motion and SRCs in complex nuclei.

    nucl-thPRC(2026)·1 citation
  6. 06

    Multi-reference Trial State for Lattice Quantum Monte Carlo Simulations

    Teng Wang · Xu Feng · Bing-Nan Lu

    Nuclear lattice effective field theory (NLEFT) is an efficient \textit{ab initio} tool for solving nuclear many-body systems using the imaginary-time projection technique, where the preparation of trial states is essential for substantially reducing the computational cost required to achieve the desired numerical precision. It has been challenging in forming optimal multi-reference trial states using multiple Slater determinants within auxiliary-field based quantum Monte Carlo frameworks like NLEFT. In this work, we develop a novel sampling method for efficiently incorporating such multi-reference trial states into NLEFT calculations. We applied the optimized trial state to Li and Li, finding overall improvements in calculated energies, electromagnetic properties, and transitions compared to results obtained without these optimizations. Our approach provides a reliable foundation for accurately simulating nuclear ground and low-lying excited states within the NLEFT framework.

    nucl-thPRC(2026)·4 citations
  7. 07

    Unified Royer law revision for alpha-decay half-lives: shell corrections, pairing,and orbital-angular-momentum

    Kai Ren · Pengfei Ma · Minghui Hu · Junlong Tian

    The Royer law is a widely used empirical relation for calculating alpha-decay half-lives; however, it requires 12 parity-dependent parameters.It exhibits systematic deviations near the shell closure. We propose an improved Royer law by adding a shell-correction term, an odd-even pairing indicator, and an orbital-angular-momentum contribution. This unified framework reduces the number of free parameters to just four, leading to significant improvements in accuracy. The root-mean-square deviation across 550 experimental data points decreases from 0.520 to 0.279, corresponding to a 66.7% reduction in parameters and 46.3% improvement in accuracy. Using this refined formalism, we predict alpha-decay half-lives for superheavy nuclei with atomic numbers.

    nucl-thCPC(2026)·2 citations

Affiliations

first authorsco-authorsvia INSPIRE