EPJ Web of Conferences
Volume 66, 2014INPC 2013 – International Nuclear Physics Conference
|Number of page(s)||4|
|Published online||20 March 2014|
Neutron occupancy of 0d5/2 orbital in 24O
1 RISP, Institute for Basic Science 70, Yusung-gu Daejeon 305-811, Korea
2 Department of Physics and Astronomy, Seoul National University, Seoul, 151-742, Korea
3 Department of Physics, Tokyo Institute of Technology, Tokyo, 152-8551, Japan
4 RIKEN Nishina Center, Saitama 351-0198, Japan
5 LPC-Caen, ENSICAEN, Université de Caen, CNRS/IN2P3, 14050 Caen cedex, France
6 Department of Physics, Rikkyo University, Tokyo 171-8501, France
7 Department of Physics, Tohoku University, Aoba, Sendai Miyagi 980-8578, Japan
8 Department of Physics, Tokyo University of Science, Noda Chiba 278-8510, Japan
9 Center for Nuclear Study, University of Tokyo, Saitama 351-0198, Japan
10 Institute for Nuclear Research of the Hungarian Academy of Sciences, P.O.Box 51 H-4001 Debrecen, Hungary
11 School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871 , China
12 Research Center for Nuclear Physics, Osaka University, Osaka 567-0047 , Japan
13 Department of Physics, University of Tokyo, Tokyo 113-0033 , Japan
a e-mail: firstname.lastname@example.org
Published online: 20 March 2014
The partial one-neutron removal cross section of 24O leading to the first excited state in 23O has been measured to be 65.7 ± 5.3 mb with a proton target in inverse kinematics at the beam energy of 62 MeV/nucleon. The decay energy spectrum of the neutron unbound state of 23O was reconstructed from the measured four momenta of 22O and the emitted neutron. A sharp peak was observed at Edecay = 48 ± 3 keV, confirming the previous measurements. The measured partial longitudinal momentum distribution of 23O* showed the d-wave knockout character, providing a support for the Jπ assignment of 5/2+ for this state. The spectroscopic factor for the neutrons in 0d5/2 orbital was deduced, for the first time, to be C2S(0d5/2) = 3.7 ± 0.3 (preliminary) by comparing with the result of Glauber model. The relatively large spectroscopic factor supports the N = 16 shell closure in the neutron drip-line nucleus 24O.
© Owned by the authors, published by EDP Sciences, 2014
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