Erosion of N = 20 shell in $^{33}$Al investigated through the ground-state electric quadrupole moment - IN2P3 - Institut national de physique nucléaire et de physique des particules Access content directly
Journal Articles Physics Letters B Year : 2012

Erosion of N = 20 shell in $^{33}$Al investigated through the ground-state electric quadrupole moment

K. Shimada
H. Ueno
  • Function : Author
G. Neyens
  • Function : Author
K. Asahi
  • Function : Author
D.L. Balabanski
  • Function : Author
J.M. Daugas
  • Function : Author
M. Depuydt
  • Function : Author
M. de Rydt
  • Function : Author
L. Gaudefroy
  • Function : Author
Y. Hasama
  • Function : Author
Y. Ichikawa
D. Kameda
  • Function : Author
Pierre Morel
  • Function : Author
T. Nagatomo
  • Function : Author
C. Stodel
Y. Utsuno
  • Function : Author
W. Vanderheijden
  • Function : Author
N. Vermeulen
  • Function : Author
P. Vingerhoets
  • Function : Author
E. Yagi
  • Function : Author
K. Yoshida
  • Function : Author
A. Yoshimi
  • Function : Author

Abstract

Electric quadrupole moment Q of the 33Al ground state has been measured by means of β-NMR spectroscopy using a spin-polarized 33Al beam produced in a projectile fragmentation reaction. The obtained Q moment, |Qexp(33Al)| = 132(16) emb, shows a significant excess from the prediction of shell model calculations within the sd shell. The result indicates sizable admixing of pf intruder configurations in the ground state, demonstrating that the N = 20 shell closure certainly erodes in 33Al, a nucleus located on the border of the island of inversion. Comparison was made with predictions of the Monte Carlo shell model, and also a particle-vibration coupling model treating the neutron pairing correlations in the ground state of 33Al. Again, a significant admixture of pf intruder configurations to the 33Al ground state was needed in both theoretical approaches to explain the observed large Q .

Dates and versions

in2p3-00770515 , version 1 (07-01-2013)

Identifiers

Cite

K. Shimada, H. Ueno, G. Neyens, K. Asahi, D.L. Balabanski, et al.. Erosion of N = 20 shell in $^{33}$Al investigated through the ground-state electric quadrupole moment. Physics Letters B, 2012, 714, pp.246--250. ⟨10.1016/j.physletb.2012.07.030⟩. ⟨in2p3-00770515⟩
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