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Nuclear Theory·nucl-th

Wednesday·August 18, 2021

5 papers—3 primary·2 cross-listed

All5Primary3Cross-lists2
  1. 01

    [Submitted on 16 Aug 2021]

    The angular correlation between the fission fragment intrinsic spins

    Aurel Bulgac🇺🇸

    The generation of fission fragments (FF) spins and of their relative orbital angular momentum has been debated for more than six decades and no consensus has been yet achieved so far. (The published abstract, being too long, can be found in the manuscript.)

    Comments:
    10 pages, 4 figures, published version
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex); Quantum Physics (quant-ph)
    arXiv:
    2108.07268 [pdf]
    PRC(2022)·21 citations
  2. 02

    [Submitted on 16 Aug 2021]

    Structure of P and Si in a two-level shape-coexistence model

    A. O. Macchiavelli · H. L. Crawford · C. M. Campbell · R. M. Clark · M. Cromaz · P. Fallon · I. Y. Lee · A. Gade · A. Poves · E. Rice

    Exclusive cross sections for the PSi reaction to the lowest and states, measured at NSCL with GRETINA and the S800, are interpreted in terms of a two-level mixing (collective) model of oblate and prolate co-existing shapes. Using the formalism developed for deformed nuclei we calculate the spectroscopic amplitudes and exclusive cross-sections in the strong coupling limit, where for P the schematic wavefunction includes the coupling of the Nilsson [211] proton orbit. Good agreement with the experimental data is obtained when the amplitude of the oblate configuration is 80\%, suggesting that both nuclei are predominantly oblate, in line with theoretical expectations.

    Comments:
    5 pages, 3 figures
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2108.07360 [pdf]
    PRC(2022)·7 citations
  3. 03

    [Submitted on 17 Aug 2021]

    Description of isospin mixing by a generator coordinate method

    M. Kimura · Y. Suzuki · T. Baba · Y. Taniguchi

    Background: The isospin mixing is an interesting feature of atomic nuclei. It plays a crucial role in astrophysical nuclear reactions. However, it is not straightforward for variational nuclear structure models to describe it. Purpose: We propose a tractable method to describe the isospin mixing within a framework of the generator coordinate method and demonstrate its usability. Method: We generate the basis wave functions by applying the Fermi transition operator to the wave functions of isobars. The superposition of these basis wave functions and variationally obtained wave functions quantitatively describes the isospin mixing. Results: Using 14N as an example, we demonstrate that our method reasonably describes both T = 0 and 1 states and their mixing. Energy spectrum and E1 transition strengths are compared with the experimental data to confirm isospin mixing. Conclusion: The proposed method is effective enough to describe isospin mixing and is useful, for example, when we discuss {\alpha} capture reactions of N = Z nuclei.

    Comments:
    14 pages, 3 figures
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2108.07592 [pdf]
    PRC(2022)·1 citation

Affiliations

first authorsco-authorsvia INSPIRE