Title: g factors of Al-31,Al-32,Al-33: Indication for intruder configurations in the Al-33 ground state
Authors: Himpe, Pieter ×
Neyens, Gerda
Balabanski, D. L
Belier, G
Borremans, D
Daugas, J. M
Santos, F. de Oliveira
De Rydt, Marieke
Flanagan, Kieran
Georgiev, G
Kowalska, M
Mallion, S
Matea, I
Morel, P
Penionzhkevich, Yu. E
Smirnova, N. A
Stodel, C
Turzo, K
Vermeulen, Nele
Yordanov, Deyan #
Issue Date: Dec-2006
Publisher: Elsevier science bv
Series Title: Physics Letters B vol:643 issue:5 pages:257-262
Abstract: The g factors of Al-31,Al-32,Al-33 have been measured using the beta-nuclear magnetic resonance (beta-NMR) technique on spin-polarized beams produced in the fragmentation of a S-36 (77.5 MeV/u) beam on a Be-9 target. Nearly pure beams of Al (Z=13) isotopes were selected with the high-resolution fragment separator LISE at GANIL. An asymmetry as high as 6% has been observed in the beta-NMR curve for Al-32 implanted in a Si single crystal. The magnetic moment of the N=20 nucleus Al-33 is obtained for the first time: mu(Al-33, I pi = 5/2(+)) = 4.088(5)mu(N), while those Of Al-31,Al-32 are obtained with improved accuracy: mu(Al-31, I-pi = 5/2(+)) = 3.830(5)mu(N) and mu(Al-32, I-pi = 1(+)) = 1.9516(22)mu(N). Comparison of the results to shell-model calculations in the sd and the sdpf shell-model spaces leads to the conclusion that Al-33 must contain some contribution from 2p-2h intruder configurations in its ground-state wave function. This indicates a gradual transition from the normal sd shell Si (Z=14) isotopes to the intruder Mg (Z=12) isotopes. (c) 2006 Elsevier B.V. All rights reserved.
ISSN: 0370-2693
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Nuclear and Radiation Physics Section
× corresponding author
# (joint) last author

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