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Isospin symmetry in B(E2) values: Coulomb excitation study of 21Mg

Ruotsalainen, P. ; Henderson, J. ; Hackman, G ; Sargsyan, G. H. ; Launey, K.D. ; Saxena, A. ; Srivastava, P. C. ; Stroberg, S. R. ; Grahn, T and Pakarinen, J. , et al. (2019) In Physical Review C: covering nuclear physics
Abstract
The Tz=−32 nucleus 21Mg has been studied by Coulomb excitation on 196Pt and 110Pd targets. A 205.6(1)-keV γ-ray transition resulting from the Coulomb excitation of the 52+ ground state to the first excited 12+ state in 21Mg was observed for the first time. Coulomb excitation cross-section measurements with both targets and a measurement of the half-life of the 12+ state yield an adopted value of B(E2;52+→12+)=13.3(4) W.u. A new excited state at 1672(1) keV with tentative 92+ assignment was also identified in 21Mg. This work demonstrates a large difference in the B(E2;52+→12+) value between T=32, A=21 mirror nuclei. The difference is investigated in the shell-model framework employing both isospin conserving and breaking USD interactions... (More)
The Tz=−32 nucleus 21Mg has been studied by Coulomb excitation on 196Pt and 110Pd targets. A 205.6(1)-keV γ-ray transition resulting from the Coulomb excitation of the 52+ ground state to the first excited 12+ state in 21Mg was observed for the first time. Coulomb excitation cross-section measurements with both targets and a measurement of the half-life of the 12+ state yield an adopted value of B(E2;52+→12+)=13.3(4) W.u. A new excited state at 1672(1) keV with tentative 92+ assignment was also identified in 21Mg. This work demonstrates a large difference in the B(E2;52+→12+) value between T=32, A=21 mirror nuclei. The difference is investigated in the shell-model framework employing both isospin conserving and breaking USD interactions and using modern ab initio nuclear structure calculations, which have recently become applicable in the sd shell. (Less)
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publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review C: covering nuclear physics
article number
051301(R)
publisher
American Physical Society
external identifiers
  • scopus:85065614139
ISSN
2469-9985
DOI
10.1103/PhysRevC.99.051301
language
English
LU publication?
no
id
cd6af529-5367-406e-b233-a1f5683f3be8
date added to LUP
2019-05-07 14:07:18
date last changed
2022-04-25 23:17:48
@article{cd6af529-5367-406e-b233-a1f5683f3be8,
  abstract     = {{The Tz=−32 nucleus 21Mg has been studied by Coulomb excitation on 196Pt and 110Pd targets. A 205.6(1)-keV γ-ray transition resulting from the Coulomb excitation of the 52+ ground state to the first excited 12+ state in 21Mg was observed for the first time. Coulomb excitation cross-section measurements with both targets and a measurement of the half-life of the 12+ state yield an adopted value of B(E2;52+→12+)=13.3(4) W.u. A new excited state at 1672(1) keV with tentative 92+ assignment was also identified in 21Mg. This work demonstrates a large difference in the B(E2;52+→12+) value between T=32, A=21 mirror nuclei. The difference is investigated in the shell-model framework employing both isospin conserving and breaking USD interactions and using modern ab initio nuclear structure calculations, which have recently become applicable in the sd shell.}},
  author       = {{Ruotsalainen, P. and Henderson, J. and Hackman, G and Sargsyan, G. H. and Launey, K.D. and Saxena, A. and Srivastava, P. C. and Stroberg, S. R. and Grahn, T and Pakarinen, J. and Ball, G. C. and Julin, R and Greenlees, P. T. and Smallcombe, J. and Andreoiu, Corina and Bernier, Nikita and Bowry, M. and Buckner, M. and Caballero-Folch, R. and Chester, A. and Cruz, S. and Evitts, L. J. and Frederick, R. and Garnsworthy, A B and Holl, Matthias and Kurkjian, A. and Kisliuk, D. and Leach, K. G. and Mcgee, E. and Measures, James and Mücher, D and Park, Joochun and Sarazin, F and Smith, J. K. and Southall, D. and Starosta, Krzysztof and Svensson, C. E. and Whitmore, K. and Williams, M. and Wu, C.Y.}},
  issn         = {{2469-9985}},
  language     = {{eng}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review C: covering nuclear physics}},
  title        = {{Isospin symmetry in B(E2) values: Coulomb excitation study of 21Mg}},
  url          = {{http://dx.doi.org/10.1103/PhysRevC.99.051301}},
  doi          = {{10.1103/PhysRevC.99.051301}},
  year         = {{2019}},
}