Title: Erosion of N=20 shell in Al-33 investigated through the ground-state electric quadrupole moment
Authors: Shimada, K ×
Ueno, H
Neyens, Gerda
Asahi, K
Balabanski, D. L
Daugas, J. M
Depuydt, M
De Rydt, Marieke
Gaudefroy, L
Grevy, S
Hasama, Y
Ichikawa, Y
Kameda, D
Morel, P
Nagatomo, T
Perrot, L
Stodel, Ch
Thomas, J. -C
Utsuno, Y
Vanderheijden, W
Vermeulen, Nele
Vingerhoets, Pieter
Yagi, E
Yoshida, K
Yoshimi, A #
Issue Date: 2012
Series Title: Physics Letters B vol:714 issue:2-5 pages:246-250
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 .
ISSN: 0370-2693
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Nuclear and Radiation Physics Section
ESAT - ELECTA, Electrical Energy Computer Architectures
× corresponding author
# (joint) last author

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