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Title: Gamow–Teller transitions and neutron–proton-pair transfer reactions

We propose a schematic model of nucleons moving in spin–orbit partner levels, j = l ± 1/2, to explain Gamow–Teller and two-nucleon transfer data in N = Z nuclei above 40Ca. Use of the LS coupling scheme provides a more transparent approach to interpret the structure and reaction data. We apply the model to the analysis of charge-exchange, 42Ca( 3He,t) 42Sc, and np-transfer, 40Ca( 3He,p) 42Sc, reactions data to define the elementary modes of excitation in terms of both isovector and isoscalar pairs, whose properties can be determined by adjusting the parameters of the model (spin–orbit splitting, isovector pairing strength and quadrupole matrix element) to the available data. The overall agreement with experiment suggests that the approach captures the main physics ingredients and provides the basis for a boson approximation that can be extended to heavier nuclei. Lastly, our analysis also reveals that the SU(4)-symmetry limit is not realized in 42Sc.
Authors:
ORCiD logo [1] ;  [2]
  1. CEA/DRF-CNRS/IN2P3, Caen (France)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Grant/Contract Number:
AC02-05CH11231; FG02-10ER41700
Type:
Published Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 780; Journal Issue: C; Related Information: © 2018 The Authors; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS
OSTI Identifier:
1426825
Alternate Identifier(s):
OSTI ID: 1462000

Van Isacker, P., and Macchiavelli, A. O.. Gamow–Teller transitions and neutron–proton-pair transfer reactions. United States: N. p., Web. doi:10.1016/j.physletb.2018.03.034.
Van Isacker, P., & Macchiavelli, A. O.. Gamow–Teller transitions and neutron–proton-pair transfer reactions. United States. doi:10.1016/j.physletb.2018.03.034.
Van Isacker, P., and Macchiavelli, A. O.. 2018. "Gamow–Teller transitions and neutron–proton-pair transfer reactions". United States. doi:10.1016/j.physletb.2018.03.034.
@article{osti_1426825,
title = {Gamow–Teller transitions and neutron–proton-pair transfer reactions},
author = {Van Isacker, P. and Macchiavelli, A. O.},
abstractNote = {We propose a schematic model of nucleons moving in spin–orbit partner levels, j = l ± 1/2, to explain Gamow–Teller and two-nucleon transfer data in N = Z nuclei above 40Ca. Use of the LS coupling scheme provides a more transparent approach to interpret the structure and reaction data. We apply the model to the analysis of charge-exchange, 42Ca(3He,t)42Sc, and np-transfer, 40Ca(3He,p)42Sc, reactions data to define the elementary modes of excitation in terms of both isovector and isoscalar pairs, whose properties can be determined by adjusting the parameters of the model (spin–orbit splitting, isovector pairing strength and quadrupole matrix element) to the available data. The overall agreement with experiment suggests that the approach captures the main physics ingredients and provides the basis for a boson approximation that can be extended to heavier nuclei. Lastly, our analysis also reveals that the SU(4)-symmetry limit is not realized in 42Sc.},
doi = {10.1016/j.physletb.2018.03.034},
journal = {Physics Letters. Section B},
number = C,
volume = 780,
place = {United States},
year = {2018},
month = {3}
}