TY - JOUR
T1 - Measurement of the electric quadrupole moment of 32Al
AU - Kameda, D.
AU - Ueno, H.
AU - Asahi, K.
AU - Takemura, M.
AU - Yoshimi, A.
AU - Haseyama, T.
AU - Uchida, M.
AU - Shimada, K.
AU - Nagae, D.
AU - Kijima, G.
AU - Arai, T.
AU - Takase, K.
AU - Suda, S.
AU - Inoue, T.
AU - Murata, J.
AU - Kawamura, H.
AU - Kobayashi, Y.
AU - Watanabe, H.
AU - Ishihara, M.
N1 - Funding Information:
The authors are grateful to staffs at the RIKEN Ring Cyclotron for their support during the running of the experiment. They would like to thank Dr. E. Yagi for useful help and advice with the X-ray diffraction analysis of the α-Al 2 O 3 sample. The authors D.K. and T.H. are grateful for the Special Postdoctoral Researcher Program in RIKEN. This work was supported in part by a Grant-in-Aid for Scientific Research from the Ministry of Education, Science, Sports and Culture. The experiment was performed at RIKEN under the Experimental-Program-No. R398n.
PY - 2007/4/5
Y1 - 2007/4/5
N2 - The electric quadrupole moment Q for the ground state of 32Al has been measured using the β-NMR technique. Spin-polarized 32Al nuclei were obtained from the fragmentation of 40Ar projectiles at E / A = 95 MeV / nucleon, and were implanted in a single crystal α-Al2O3 stopper. The quadrupole moment was deduced from the measured quadrupole coupling constant. The obtained value, | Q (32Alg.s.) | = 24 (2) mb, is remarkably small as compared with other Al isotopes, but is well explained by shell model calculations within the sd shell. The present result indicates that 32Al has a normal sd-shell structure, in contrast to the neighboring N = 19 isotone 31Mg for which a strongly deformed intruder ground state has been reported to occur.
AB - The electric quadrupole moment Q for the ground state of 32Al has been measured using the β-NMR technique. Spin-polarized 32Al nuclei were obtained from the fragmentation of 40Ar projectiles at E / A = 95 MeV / nucleon, and were implanted in a single crystal α-Al2O3 stopper. The quadrupole moment was deduced from the measured quadrupole coupling constant. The obtained value, | Q (32Alg.s.) | = 24 (2) mb, is remarkably small as compared with other Al isotopes, but is well explained by shell model calculations within the sd shell. The present result indicates that 32Al has a normal sd-shell structure, in contrast to the neighboring N = 19 isotone 31Mg for which a strongly deformed intruder ground state has been reported to occur.
KW - Electric quadrupole moment of Al
KW - Island of inversion
KW - Nuclear deformation
KW - Projectile fragmentation
KW - β-NMR
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U2 - 10.1016/j.physletb.2007.01.063
DO - 10.1016/j.physletb.2007.01.063
M3 - Article
AN - SCOPUS:33947148999
VL - 647
SP - 93
EP - 97
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
SN - 0370-2693
IS - 2-3
ER -