EPJ Web of Conferences (Mar 2014)

Neutron occupancy of 0d5/2 orbital in 24O

  • Tshoo K.,
  • Satou Y.,
  • Bhang H.,
  • Choi S.,
  • Nakamura T.,
  • Kondo Y.,
  • Deguchi S.,
  • Kawada Y.,
  • Kobayashi N.,
  • Nakayama Y.,
  • Tanaka K.N.,
  • Tanaka N.,
  • Togano Y.,
  • Aoi N.,
  • Ishihara M.,
  • Motobayashi T.,
  • Otsu H.,
  • Sakurai H.,
  • Takeuchi S.,
  • Yoneda K.,
  • Delaunay F.,
  • Gibelin J.,
  • Marqués F.M.,
  • Orr N.A.,
  • Honda T.,
  • Matsushita M.,
  • Kobayashi T.,
  • Miyashita Y.,
  • Sumikama T.,
  • Yoshinaga K.,
  • Shimoura S.,
  • Sohler D.,
  • Zheng T.,
  • Cao Z.X.,
  • Li Z.H.

DOI
https://doi.org/10.1051/epjconf/20146602103
Journal volume & issue
Vol. 66
p. 02103

Abstract

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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.