Quadrupole moment of the proton drip-line nuclide 13O

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Abstract

The quadrupole moment of the proton drip-line nuclide 13O(Iπ=3/2,T=3/2,T1/2=8.6 ms) has been determined for the first time by detecting its β-NQR signal following the production of polarized 13O through the projectile fragmentation process in the 16O + Be collision. The quadrupole moment has been determined to be |Q(13O)|=11.0±1.3 mb. The present result together with the quadrupole moment of its mirror partner 13B is compared with the theoretical values obtained by the shell model code, OXBASH, and by the Hartree-Fock calculation with its single proton separation energy taken into account.

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Acknowledgements

The authors express their thanks to S.S. Hanna for his valuable discussions. The present work was supported by the Grant in Aid for Scientific Research from the Ministry of Education, Science, Sports, and Culture of Japan. The present experimental studies were performed as the Program R140n at RIKEN RING Cyclotron.

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1

E-Mail: [email protected]

2

Present address: Research Reactor Institute, Kyoto University, Kumatori, Osaka 590-0451, Japan.

3

Present address: Department of Physics, Faculty of Science, Niigata University, Niigata 950-21, Japan.

4

Present address: RIKEN, Wako, Saitama 351-01, Japan.

5

Present address: Kochi University of Technology, Tosayamada, Kochi 782, Japan.

6

Present address: The Energy Center, Wakasa Bay, Tsuruga, Fukui 914, Japan.

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