TY - JOUR
T1 - Erosion of N=20 shell in Al 33 investigated through the ground-state electric quadrupole moment
AU - Shimada, K.
AU - Ueno, H.
AU - Neyens, G.
AU - Asahi, K.
AU - Balabanski, D. L.
AU - Daugas, J. M.
AU - Depuydt, M.
AU - De Rydt, M.
AU - Gaudefroy, L.
AU - Grévy, S.
AU - Hasama, Y.
AU - Ichikawa, Y.
AU - Kameda, D.
AU - Morel, P.
AU - Nagatomo, T.
AU - Perrot, L.
AU - Stodel, C.
AU - Thomas, J. C.
AU - Utsuno, Y.
AU - Vanderheijden, W.
AU - Vermeulen, N.
AU - Vingerhoets, P.
AU - Yagi, E.
AU - Yoshida, K.
AU - Yoshimi, A.
N1 - Funding Information:
The authors thank the staff of GANIL for their support during the experiment. This work was partly supported by the JSPS KAKENHI ( 22340071 ), by the JSPS and MAEE under the Japan–France Integrated Action Program (SAKURA) , by the French–Japanese International Associated Laboratory for Nuclear Structure Problems (LIA) , and also financed by the European Community FP6 – Structuring the ERA – Integrated Infrastructure Initiative contract EURONS No. RII3-CT-2004-506065 , by the FWO-Vlaanderen , by the IAP-programme of the Belgium Science Policy under grand number P6/23 , and by Bulgarian National Science Fund , grant No. DID-02/16 . The experiment was carried out under Experimental Program E437b .
PY - 2012/8/14
Y1 - 2012/8/14
N2 - Electric quadrupole moment Q of the Al 33 ground state has been measured by means of β-NMR spectroscopy using a spin-polarized Al 33 beam produced in a projectile fragmentation reaction. The obtained Q moment, |Q exp( 33Al)|=132(16) emb, shows a significant excess from the prediction of shell model calculations within the sd shell. The result indicates sizable admixing of pf intruder configurations in the ground state, demonstrating that the N=20 shell closure certainly erodes in Al 33, a nucleus located on the border of the island of inversion. Comparison was made with predictions of the Monte Carlo shell model, and also a particle-vibration coupling model treating the neutron pairing correlations in the ground state of Al33. Again, a significant admixture of pf intruder configurations to the Al 33 ground state was needed in both theoretical approaches to explain the observed large Q.
AB - Electric quadrupole moment Q of the Al 33 ground state has been measured by means of β-NMR spectroscopy using a spin-polarized Al 33 beam produced in a projectile fragmentation reaction. The obtained Q moment, |Q exp( 33Al)|=132(16) emb, shows a significant excess from the prediction of shell model calculations within the sd shell. The result indicates sizable admixing of pf intruder configurations in the ground state, demonstrating that the N=20 shell closure certainly erodes in Al 33, a nucleus located on the border of the island of inversion. Comparison was made with predictions of the Monte Carlo shell model, and also a particle-vibration coupling model treating the neutron pairing correlations in the ground state of Al33. Again, a significant admixture of pf intruder configurations to the Al 33 ground state was needed in both theoretical approaches to explain the observed large Q.
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U2 - 10.1016/j.physletb.2012.07.030
DO - 10.1016/j.physletb.2012.07.030
M3 - Article
AN - SCOPUS:84864520250
SN - 0370-2693
VL - 714
SP - 246
EP - 250
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
IS - 2-5
ER -