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Nuclear Theory·nucl-th

Friday·April 26, 2024

4 papers—1 primary·3 cross-listed

All4Primary1Cross-lists3
  1. 01

    Ground state properties and bubble structure of the isotopic chains of Z = 125 and 126 using the relativistic mean-field formalism

    Priyanka · A. Chauhan · M. S. Mehta · M. Bhuyan

    The ground state properties of Z = 125 and 126 nuclei are investigated, taking the isotopic series from the proton to neutron drip-lines. This analysis is conducted using the relativistic mean-field approach with NL3 and the Relativistic-Hartree-Bogoliubov model with DD-ME2 parameterization. The bulk properties under examination include the binding energy, the neutron separation energies, the differential variation of the separation energy, the quadrupole deformation parameter , and the single-particle energy. We observed the stability at N = 172 and 184 over the isotopic chain for both parameter sets. The quadrupole deformation parameter reveals a shape transition from prolate to spherical and back to prolate with mass number. No signature of a super- and/or hyper-deformed structure is found over the isotopic chain. Furthermore, the analysis is extended to examine the bubble structure, revealing a bubble/semi-bubble structure for a few neutron-rich isotopes.

    nucl-thJ.Phys.G(2024)·2 citations
  2. 02

    Inclusive studies of two- and three-nucleon short-range correlations in H and He

    S. Li · S. N. Santiesteban · J. Arrington · R. Cruz-Torres · L. Kurbany · D. Abrams · S. Alsalmi · D. Androic · K. Aniol · T. Averett · C. Ayerbe Gayoso · J. Bane and 104 other authors

    Inclusive electron scattering at carefully chosen kinematics can isolate scattering from the high-momentum nucleons in short-range correlations (SRCs). SRCs are produced by the hard, short-distance interactions of nucleons in the nucleus, and because the two-nucleon (2N) SRCs arise from the same N-N interaction in all nuclei, the cross section in the SRC-dominated regime is identical up to an overall scaling factor. This scaling behavior has been used to identify SRC dominance and to measure the contribution of SRCs in a wide range of nuclei. We examine this scaling behavior over a range of momentum transfers using new data on H, H, and He, and find an expanded scaling region compared to heavy nuclei. Motivated by this improved scaling, we examine the H and He data in kinematics where three-nucleon SRCs may play an important role. The data for the largest struck nucleon momenta are consistent with isolation of scattering from three-nucleon SRCs, and suggest that the very highest momentum nucleons in He have a nearly isospin-independent momentum configuration.

    ↳ nucl-exnucl-thPLB(2025)·6 citations
  3. 03

    Low-mass dark sector searches with deuteron photodisintegration

    Cornelis J.G. Mommers🇩🇪 · Marc Vanderhaeghen🇩🇪

    Recent years have seen much activity in searches for dark-sector messenger particles in the 10-100 MeV mass range, especially in view of a potential new light boson conjectured by the ATOMKI collaboration, X17. Under the assumption that the messenger particle has definite parity and either zero or unit spin, quite stringent bounds already exist on its coupling to electrons and protons. Equally stringent bounds on the neutron coupling do not exist yet, but are nonetheless desirable. We explore how measurements of deuteron photodisintegration with a quasi-free neutron can yield bounds on the neutron coupling, and compute projections for a potential measurement at the lowenergy high-intensity electron scattering experiment MAGIX@MESA. The projected bounds are found to be competitive for an axial-vector or pseudoscalar scenario, but not for a vector or scalar scenario.

    ↳ hep-phnucl-exnucl-thPRD(2024)·2 citations
  4. 04

    Neutrino many-body flavor evolution: the full Hamiltonian

    Vincenzo Cirigliano🇺🇸 · Srimoyee Sen🇺🇸 · Yukari Yamauchi🇺🇸

    We study neutrino flavor evolution in the quantum many-body approach using the full neutrino-neutrino Hamiltonian, including the usually neglected terms that mediate non-forward scattering processes. Working in the occupation number representation with plane waves as single-particle states, we explore the time evolution of simple initial states with up to neutrinos. We discuss the time evolution of the Loschmidt echo, one body flavor and kinetic observables, and the one-body entanglement entropy. For the small systems considered, we observe `thermalization' of both flavor and momentum degrees of freedom on comparable time scales, with results converging towards expectation values computed within a microcanonical ensemble. We also observe that the inclusion of non-forward processes generates a faster flavor evolution compared to the one induced by the truncated (forward) Hamiltonian.

    ↳ hep-phnucl-thquant-phPRD(2024)·30 citations

Affiliations

first authorsco-authorsvia INSPIRE