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Nuclear Theory·nucl-th

Thursday·March 2, 2023

12 papers—6 primary·6 cross-listed

All12Primary6Cross-lists6
  1. 01

    [Submitted on 1 Mar 2023]

    Low-Energy Deuteron-Alpha Elastic Scattering in Cluster Effective Field Theory

    Farzaneh Nazari · Mahdi Radin · Mahdi Moeini Arani

    In this paper, we study the low-energy elastic scattering within the two-body cluster effective field theory (EFT) framework. The importance of the scattering in the production reaction leads us to study this system in an effective way. In the beginning, the scattering amplitudes of each channel are written in a cluster EFT with two-body formalism. Using the effective range expansion analysis for the elastic scattering phase shift of , and partial waves, the unknown EFT low-energy coupling constants are determined and the leading and next-to-leading orders EFT results for the phase shift in each channel are presented. To verify the accuracy of the results, we compare experimental phase shift and differential cross section data with obtained results. The accuracy of the EFT results and consistency with the experimental data indicate that the EFT is an effective approach for describing low-energy systems.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2303.00338 [pdf]
    EPJA(2023)·2 citations
  2. 02

    [Submitted on 1 Mar 2023]

    Isospin dependence in single-nucleon removal cross sections explained through valence-core destruction effects

    M. Gomez-Ramos · J. Gomez-Camacho · A.M. Moro

    The discrepancy between experimental data and theoretical calculations in one-nucleon removal reactions at intermediate energies (quantified by the so-called "quenching factors") and its dependence on the isospin asymmetry of the nuclei has been an open problem in nuclear physics for the last fifteen years. In this work, we propose an explanation for this long-standing problem, which relies on the inclusion of the process of core destruction due to its interaction with the removed nucleon. To include this effect, we extend the commonly used eikonal formalism via an effective nucleon density, and apply it to a series of nucleon knockout reactions. The effect of core destruction is found to depend strongly on the binding energy of the removed nucleon, leading to a significant reduction of the cross section for deeply bound nucleons, which reduces the isospin dependence of the "quenching factors", making them more consistent with the trends found in transfer and (p,pN) reactions.

    Comments:
    7 pages, 4 figures, Submitted to Physical Review Letters
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2303.00426 [pdf]
    PLB(2023)·12 citations
  3. 03

    [Submitted on 1 Mar 2023]

    Proton \textit{s}-resonance states of C and O within the Skyrme Hartree-Fock mean-field framework

    Le-Anh Nguyen · Young-ho Song · Minh-Loc Bui

    The excitation functions of proton elastic scattering on C and O nuclei at the energies near the proton-emission threshold are calculated using the Skyrme Hartree-Fock (SHF) in continuum approach. For each excitation function, the first resonance is identified as the -state resonance of the mean-field theory. For O, whose ground-state spin is nonzero, the -state resonance splits into two resonances via the spin-spin component of the optical potential. With a slight adjustment of the strength of central potential, which is obtained from the SHF in continuum approach, the excitation functions of proton elastic scattering for the three nuclei can be explained with high accuracy. The proposed framework can provide a practical method to explain nuclear scattering at the energies near the proton-emission threshold with minimal experimental input.

    Comments:
    14 pages, 4 figures, 1 table. Accepted by Phys. Rev. C
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2303.00472 [pdf]
    PRC(2023)·4 citations
  4. 04

    [Submitted on 1 Mar 2023]

    Review of magnetic- and antimagnetic-rotational structures in nuclei

    Sushil Kumar · Sukhjeet Singh · Balraj Singh · Amita · Ashok Kumar Jain

    This work is an update of the 2000 publication of magnetic-rotational bands by Amita et al. [1], followed by an unpublished update of 2006 [2], and reviews detailed experimental data extracted from original publications for 228 magnetic-rotational (MR or Shears) structures spread over 117 nuclides, and 40 antimagnetic-rotational (AMR) structures in 28 nuclei, with a brief commentary about each band. Many of these nuclei are located at or near the semi-magic nucleon numbers, mostly for protons. For example, 88 MR bands are currently known for the Pb (Z=82) nuclei, and 29 AMR band in Pd, Cd and In nuclei. It is interesting that the proton magic numbers appear to play a major role in the MR phenomenon, which seems less well understood. A brief discussion of the salient features of the MR and AMR bands and their theoretical interpretation has been presented in the present review. The tables contain gamma-ray energies, associated level energies with spins and parities, level lifetimes, B(M1), B(E2), and B(M1)/B(E2) ratios and probable spherical quasiparticle configurations. We find that many bands claimed in the literature as MR and AMR bands still have tentative assignments, as level lifetimes, thus B(M1) and B(E2) values, for a large number of MR and AMR bands, which can potentially provide critical criteria for firm identification of such structures, are lacking. Additionally, theoretical model calculations for many of these bands, which could provide insight for a better description of nuclear structure, are also lacking in literature. While this review is mainly based on original research articles, nuclear structure databases ENSDF [3], XUNDL [4], and NSR [5] have been consulted for completeness. The literature cut-off date March 31, 2025.

    Comments:
    105 pages, 4 figures, 3 tables
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2303.00499 [pdf]
    Atom.Data Nucl.Data Tabl.(2025)·4 citations
  5. 05

    [Submitted on 1 Mar 2023]

    The optimal detection angles for producing N=126 neutron-rich isotones in the multinucleon transfer reactions

    Zehong Liao · Long Zhu · Zepeng Gao · Jun Su · Cheng Li

    The challenge of isotopic identification over a wide angular distribution has limited the measurement of neutron-rich nuclei produced via the multinucleon transfer (MNT) process. To investigate the optimal detection angles for the N=126 isotones, we propose a method to construct the reasonable scattering angles of the MNT products in the dinuclear system (DNS-sysu) model. The reactions Xe + Pb are investigated. The calculated results are in rather good agreement with the available experimental data in the reaction Xe + Pb. The entrance channel effects on the scattering angle are investigated. It is found that the scattering angular distribution strongly depends on the isospin and the impact parameter of the collision system. The optimal angle ranges for detecting neutron-rich nuclides Pt, Ir, Os, and Re in the Xe + Pb reaction at the incident energy are predicted. Our results suggest that the angle range is most favorable for detecting unknown N=126 isotones. Given the current difficulties in separating and identifying experimental MNT fragments, the results of this work could provide significant contributions to future experiments.

    Comments:
    6 pages, 5 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2303.00519 [pdf]
    PRResearch(2023)·18 citations
  6. 06

    [Submitted on 1 Mar 2023]

    Ab Initio Symmetry-Adapted Emulator for Studying Emergent Collectivity and Clustering in Nuclei

    Kevin S. Becker · Kristina D. Launey · Andreas Ekström · Tomas Dytrych

    We discuss emulators from the ab initio symmetry-adapted no-core shell-model framework for studying the formation of alpha clustering and collective properties without effective charges. We present a new type of an emulator, one that utilizes the eigenvector continuation technique but is based on the use of symplectic symmetry considerations. This is achieved by using physically relevant degrees of freedom, namely, the symmetry-adapted basis, which exploits the almost perfect symplectic symmetry in nuclei. Specifically, we study excitation energies, point-proton root-mean-square radii, along with electric quadrupole moments and transitions for 6Li and 12C. We show that the set of parameterizations of the chiral potential used to train the emulators has no significant effect on predictions of dominant nuclear features, such as shape and the associated symplectic symmetry, along with cluster formation, but slightly varies details that affect collective quadrupole moments, asymptotic normalization coefficients, and alpha partial widths up to a factor of two. This makes these types of emulators important for further constraining the nuclear force for high-precision nuclear structure and reaction observables.

    Comments:
    11 pages including references, 47 cited references, 1 table, 6 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2303.00667 [pdf]
    Front.in Phys.(2023)·15 citations

Affiliations

first authorsco-authorsvia INSPIRE