Electric quadrupole moment of the neutron-rich Al-33
Nagatomo, T × Shimada, K 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 Perrot, L Stoedel, C Thomas, J. C Vanderheijden, W Vermeulen, N Vingerhoets, Pieter Yoshimi, A Neyens, Gerda Ueno, H #
European Physical Journal A, Hadrons and Nuclei vol:42 issue:3 pages:383-385
ENAM edition:2008 location:Ryn (Poland) date:September 7-11, 2008
The nuclear electric quadrupole moment (Q moment) of the neutron-rich nucleus Al-33 (I = 5/2, T-1/2 = 41 ms) has been measured by the beta-ray detected nuclear quadrupole resonance (beta-NQR) method for the first time. The Al-33 nucleus is considered to be on the border of the island of inversion within which a significant intrusion of the pf orbits occurs across the N = 20 shell gap and the intrusion causes an anomalous enhancement of the Q moment. Polarized Al-33 nuclei were produced from S-36 (77.5MeV/u) beams through the fragmentation process and separated by LISE fragment separator at GANIL. The Al-33 nuclei were implanted into a Al2O3 single-crystal plate and the beta-NQR spectrum was successfully obtained.