https://doi.org/10.1140/epja/i2009-10885-3
Regular Article - Experimental Physics
Electric quadrupole moment of the neutron-rich 33Al
1
RIKEN Nishina Center Wako, 351-0198, Saitama, Japan
2
Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai, 980-8578, Miyagi, Japan
3
Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, 152-8550, Tokyo, Japan
4
Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, 1784, Sofia, Bulgaria
5
CEA/DIF/DPTA/PN, BP 12, F-91680, Bruyeres le Chatel, France
6
Instituut voor Kern- en Stralingsfysica, K.U. Leuven, 3001, Leuven, Belgium
7
Grand Accelerateur National d’Ions Lourds, BP 55027, F-14076, Caen codex 5, France
8
Institut de Physique Nuclelaire, F-91406, Orsay, France
* e-mail: nagatomo@riken.jp
Received:
31
December
2008
Revised:
19
August
2009
Accepted:
8
September
2009
Published online:
16
October
2009
The nuclear electric quadrupole moment (Q moment) of the neutron-rich nucleus 33Al (I = 5/2 , T
1/2 = 41 ms) has been measured by the -ray detected nuclear quadrupole resonance (
-NQR) method for the first time. The 33Al 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 33Al nuclei were produced from 36S (77.5MeV/u beams through the fragmentation process and separated by LISE fragment separator at GANIL. The 33Al nuclei were implanted into a Al2O3 single-crystal plate and the
-NQR spectrum was successfully obtained.
© SIF, Springer-Verlag Berlin Heidelberg, 2009