Eur. Phys. J. A (2009) 42: 383-385
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

Abstract

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.