PaperPanorama
FAQ

Nuclear Theory·nucl-th

Tuesday·December 16, 2025

15 papers—7 primary·8 cross-listed

All15Primary7Cross-lists8
  1. 01

    Variations of two-neutron separation energies and thermal-neutron capture cross sections versus the pairing gap

    Hossein Emami · Hadi Sabri

    In this work, we investigate the experimental correlation between the pairing gap values and two important observables in the study of nuclear structure (two neutron separation energies and thermal-neutron capture cross-sections). To this aim, we focused on the even-even nuclei in the vicinity of Z=50 and Z = 82 closed proton shells, for which the quantum phase transition phenomena are reported. The results show a significant correlation between the pairing gap and the well-known signatures of quantum phase transitions in the nuclei, which are the candidates for E(5) and X(5) critical points. Also, we have explained the special relation between the pairing gap and the cross-section of thermal neutrons in the considered isotopic chains.

    nucl-th0 citations
  2. 02

    Emergence of thermal recoil jets in high-energy heavy-ion collisions

    Peng Jing🇨🇳 · Yichao Dang🇨🇳 · Yang He🇨🇳 · Shanshan Cao🇨🇳 · Li Yi🇨🇳 · Xin-Nian Wang🇨🇳

    In the established paradigm of jet quenching in relativistic heavy-ion collisions, jets from initial hard parton scatterings are suppressed due to their interaction with the quark-gluon plasma (QGP) as they traverse the hot medium, serving as crucial tomographic probes of QGP properties. The QGP is also capable of absorbing and reprocessing energy deposited by the hard jets into emergent jet-like objects, providing a novel production mechanism of thermal recoil jets. These emergent thermal recoil jets exhibit distinct transverse momentum () and jet-size () dependencies different from the hard jets, and naturally explain the puzzling observation of the enhanced yields of hadron or photon triggered jets at large azimuthal angle and solely at small and large . These thermal recoil jets are predicted to have unique substructures, such as their jet shape that increases with the radius and the thermal-like distribution of their constituents, which can be verified in future experimental analyses.

    nucl-thhep-phnucl-ex4 citations
  3. 03

    Single-step Quantum Simulation of Two Nucleons

    Bhoomika Maheshwari🇫🇷 · Paul Stevenson🇬🇧 · P. Van Isacker🇫🇷

    Quantum computing offers a scalable approach to solving the nuclear shell model, a highly complex and exponentially scaled many-body problem. This work presents a numerical simulation of the subspace search variational quantum eigensolver (SSVQE) combined with an adaptive derivative-assembles pseudo-trotter (ADAPT) ansatz to obtain the low-lying states of any nuclear system in a single optimization run. As an example, we apply this method in this work to a trivial identical nucleon system, two nucleons in the orbital, mapped to 4 qubits depicting m-scheme single-particle states including a surface delta effective interaction using the Jordan-Wigner transformation. The ADAPT-SSVQE algorithm, by utilizing a symmetry-preserving double-excitation ADAPT operator pool, uniquely optimizes a weighted energy sum, forcing the simultaneous convergence of two lowest states within the total angular momentum subspace. We demonstrate the accuracy of the method by benchmarking against the exact diagonalization, confirming its potential for probing nuclear structure and pairing phenomena on current and near-future quantum devices without requiring multi-step procedure for excited states.

    nucl-thhep-thnucl-exquant-phActa Phys.Polon.Supp.(2026)·2 citations
  4. 04

    Elastic Scattering: An Application of Variable Phase Approach to Local Potential

    Anil Khachi

    Distance-dependent phase shifts, amplitude functions, and radial wave functions for neutron-alpha elastic scattering are studied using the Variable Phase Approach. The microscopic KKNN potential is employed to calculate scattering properties for the , , and partial waves over a range of laboratory energies. The variable phase equations are solved numerically using a fifth-order Runge-Kutta method, allowing a direct examination of how the nuclear interaction generates the scattering phase within the finite interaction region. The results exhibit physically consistent behavior of the phase shifts and yield well-behaved amplitude and wave functions. This study demonstrates that the Variable Phase Approach provides a physically transparent and reliable framework for describing neutron-alpha elastic scattering and for applications in inverse scattering problems.

    nucl-th0 citations
  5. 05

    Perturbative EFT calculation of the deuteron longitudinal response function

    Andrew J. Andis🇺🇸 · Songlin Lyu🇮🇹 · Bingwei Long🇨🇳 · Sebastian König🇺🇸

    In this work, we study the longitudinal response function of the deuteron up to next-to-next-to-leading order in chiral effective field theory (Chiral EFT). We use an approach that maintains exact renormalization group (RG) invariance at each order of the EFT expansion by treating all subleading corrections in perturbation theory. To that end, we extent the Lorentz Integral Transform (LIT) method to allow for such a perturbative treatment. In doing so, we further develop the existing work on strictly RG invariant Chiral EFT, which has so far focused primarily on binding energies and static properties, to inelastic processes. We carefully analyze the convergence properties of the theory and find good agreement with available experimental data. Our findings provide the foundation for similar studies of inelastic processes in a range of nuclei, based on perturbatively renormalized EFT schemes.

    nucl-th3 citations
  6. 06

    Local Quantum Cooling for Large Fermi Systems with Pairing

    J. E. Alba-Arroyo · Daniel Pęcak · Michael McNeil Forbes · Gabriel Wlazłowski

    We present a framework for local quantum cooling that can be efficiently applied to large-scale Fermi systems. The method introduces local Hermitian operators as a cooling potential while strictly preserving the unitarity of time evolution. Our formulation scales favorably with system size and can be seamlessly integrated into time-dependent density-functional theory frameworks. We demonstrate that energy cooling arises from the damping of particle currents and pairing-field fluctuations. Furthermore, we develop a variant of the scheme that allows the particle number to vary in time, enabling controlled density scans. The method is generic and versatile, as illustrated by applications to spin-imbalanced unitary Fermi gases and to nuclear matter in the neutron-star crust. The framework can be naturally extended to include stochastic noise, providing a foundation for studying thermalization in strongly interacting Fermi superfluids.

    nucl-thcond-mat.quant-gasPRC(2026)·0 citations
  7. 07

    Shell model study of isobaric analog states for nuclei using isospin non-conserving interactions

    Sakshi Shukla · Praveen C. Srivastava · Kazunari Kaneko

    In order to comprehend the process underlying mirror energy differences in mirror pairs, we have performed shell-model calculations for -shell nuclei in the mass range = 20 to 36 and neutron number varying from = 8 to 20. Isospin-symmetry breaking (ISB) is responsible for the mirror energy difference of excited states. We have investigated the {\color{black}isospin non-conserving} interactions: USDC and USDCm to explore the low-lying energy spectra, mirror energy differences, isoscalar (), isovector () matrix elements, \textit{E2} transition probability, magnetic (), and quadrupole moments () of mirror-pair and compared them with their available experimental data. The impact of single-particle states on weakly bound and unbound nuclear states are investigated, especially those of the -wave. We have also analyzed single proton/neutron separation energies and proton/neutron occupancy for (=-2)/(=+2) -shell nuclei.

    nucl-thnucl-exJ.Phys.G(2026)·1 citation

Affiliations

first authorsco-authorsvia INSPIRE