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Electric quadrupole moment of the neutron-rich 33Al |
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| Authors: | T. Nagatomo K. Shimada K. Asahi D. L. Balabanski J. M. Daugas M. Depuydt M. De Rydt L. Gaudefroy S. Grévy Y. Hasama Y. Ichikawa D. Kameda P. Morel L. Perrot C. St?del J. C. Thomas W. Vanderheijden N. Vermeulen P. Vingerhoets A. Yoshimi G. Neyens H. Ueno |
| Affiliation: | 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 |
| 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 $ beta$ -ray detected nuclear quadrupole resonance ( $ beta$ -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 $ beta$ -NQR spectrum was successfully obtained. |
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