The unbound excited states of the neutron drip-line isotope O24 have been investigated via the O24(p,p ′)O23+n reaction in inverse kinematics at a beam energy of 62MeV/nucleon. The decay energy spectrum of O*24 was reconstructed from the momenta of O23 and the neutron. The spin parity of the first excited state, observed at E x=4.65±0. 14MeV, was determined to be Jπ=2 + from the angular distribution of the cross section. Higher-lying states were also observed. The quadrupole transition parameter β 2 of the 21+ state was deduced, for the first time, to be 0.15±0.04. The relatively high excitation energy and small β 2 value are indicative of the N=16 shell closure in O24.
|Journal||Physical review letters|
|Publication status||Published - 2012 Jul 12|
ASJC Scopus subject areas
- Physics and Astronomy(all)