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Nuclear Theory·nucl-th

Thursday·April 14, 2022

6 papers—2 primary·4 cross-listed

All6Primary2Cross-lists4
  1. 01

    [Submitted on 12 Apr 2022]

    The nuclear shell model towards the drip lines

    B. Alex Brown

    Applications of configuration mixing methods for nuclei near the proton and neutron drip lines are discussed. A short review of magic numbers is presented. Prospects for advances in the regions of four new "outposts" are highlighted: O, Si, Ca and Ni. Topics include: shell gaps, single-particle properties, islands-of-inversion, collectivity, neutron decay, neutron halos, two-proton decay, effective charge, and quenching in knockout reactions.

    Comments:
    14 pages, 17 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2204.06088 [pdf]
    MDPI Physics(2022)·30 citations
  2. 02

    [Submitted on 12 Apr 2022]

    Towards a Predictive HFB+QRPA Framework for Deformed Nuclei: Selected Tools and Technique

    Emanuel V. Chimanski🇺🇸 · Eun Jin In🇺🇸 · Jutta E. Escher🇺🇸 · Sophie Péru🇫🇷 · Walid Younes🇺🇸

    Reliable predictions of the static and dynamic properties of a nucleus require a fully microscopic description of both ground and excited states of this complicated many-body quantum system. Predictive calculations are key to understanding such systems and are important ingredients for simulating stellar environments and for enabling a variety of contemporary nuclear applications. Challenges that theory has to address include accounting for nuclear deformation and the ability to describe medium-mass and heavy nuclei. Here, we perform a study of nuclear states in an Hartree-Fock-Bogoliubov (HFB) and Quasiparticle Random Phase Approximation (QRPA) framework that utilizes an axially-symmetric deformed basis. We present some useful techniques for testing the consistency of such calculations and for interpreting the results.

    Comments:
    Contribution to the XLIV Brazilian Workshop on Nuclear Physics, Brazil
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2204.06100 [pdf]
    J.Phys.Conf.Ser.(2022)·3 citations
  3. 03

    [Submitted on 12 Apr 2022] (cross-list from hep-ph)

    Improved limits on lepton-flavor-violating decays of light pseudoscalars via spin-dependent conversion in nuclei

    Martin Hoferichter🇨🇭 · Javier Menéndez🇪🇸 · Frederic Noël🇨🇭

    Lepton-flavor-violating decays of light pseudoscalars, , are stringently suppressed in the Standard Model up to tiny contributions from neutrino oscillations, so that their observation would be a clear indication for physics beyond the Standard Model. However, in effective field theory such decays proceed via axial-vector, pseudoscalar, or gluonic operators, which are, at the same time, probed in spin-dependent conversion in nuclei. We derive master formulae that connect both processes in a model-independent way in terms of Wilson coefficients, and study the implications of current limits in titanium for the decays. We find that these indirect limits surpass direct ones by many orders of magnitude.

    Comments:
    9 pages, 2 figures; journal version
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
    arXiv:
    2204.06005 [pdf]
    PRL(2023)·36 citations
  4. 04

    [Submitted on 13 Apr 2022] (cross-list from hep-ph)

    Deuteron electromagnetic form factors and tensor polarization observables in the framework of the hard-wall AdS/QCD model

    Narmin Huseynova🇦🇿 · Shahin Mamedov🇦🇿 · Jannat Samadov🇦🇿

    We study the electromagnetic form factors and tensor polarization observables of the deuteron in the framework of the hard-wall AdS/QCD model. We find a profile function for the bulk twist vector field, which describes the deuteron on the boundary and fix the infrared boundary cut-off of AdS space in accordance with the ground state mass of the deuteron. We obtain the deuteron charge monopole, quadrupole, and magnetic dipole form factors and tensor polarization observables from the bulk Lagrangians for the deuteron and photon field interactions. We plot the momentum transfer dependence of the form factors and tensor polarization observables and compare our numerical results with those in the soft-wall model and experimental data.

    Comments:
    15 pages, 7 figures, the article is accepted to be published in Chinese Physics C
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2204.06205 [pdf]
    CPC(2023)·7 citations
  5. 05

    [Submitted on 13 Apr 2022] (cross-list from math-ph)

    Two particles interacting via a contact interaction on

    Dominic Schuh🇩🇪 · Thomas Luu🇩🇪

    We consider two particles interacting via a contact interaction that are constrained to a sphere, or . We determine their spectrum to arbitrary precision and for arbitrary angular momentum. We show how the non-inertial frame leads to non-trivial solutions for different angular momenta. Our results represent an extension of the finite-volume Lüscher formulas but now to a non-trivial geometry. We apply our results to predict the spectrum of select two-nucleon halo nuclei and compare with experimental results.

    Comments:
    24 pages, 6 figures
    Subjects:
    Mathematical Physics (math-ph); High Energy Physics — Lattice (hep-lat); math.MP (math.MP); Nuclear Theory (nucl-th)
    arXiv:
    2204.06263 [pdf]
    EPJA(2022)·0 citations
  6. 06

    [Submitted on 13 Apr 2022] (cross-list from physics.chem-ph)

    Benchmarking CASPT3 Vertical Excitation Energies

    Martial Boggio-Pasqua🇫🇷 · Denis Jacquemin🇫🇷 · Pierre-François Loos🇫🇷

    Based on 280 reference vertical transition energies of various natures (singlet, triplet, valence, Rydberg, , , and double excitations) extracted from the QUEST database, we assess the accuracy of third-order multireference perturbation theory, CASPT3, in the context of molecular excited states. When one applies the disputable ionization-potential-electron-affinity (IPEA) shift, we show that CASPT3 provides a similar accuracy as its second-order counterpart, CASPT2, with the same mean absolute error of eV. However, as already reported, we also observe that the accuracy of CASPT3 is almost insensitive to the IPEA shift, irrespective of the transition type and system size, with a small reduction of the mean absolute error to eV when the IPEA shift is switched off.

    Comments:
    12 pages, 3 figures (supplementary material available)
    Subjects:
    physics.chem-ph (physics.chem-ph); Strongly Correlated Electrons (cond-mat.str-el); Nuclear Theory (nucl-th)
    arXiv:
    2204.06480 [pdf]
    J.Chem.Phys.(2022)·3 citations

Affiliations

first authorsco-authorsvia INSPIRE