Observation of high- quasiparticle states in Cm by in-beam -ray spectroscopy using heavy-ion transfer reactions

Ishii, Tetsuro  ; Makii, Hiroyuki*; Asai, Masato  ; Tsukada, Kazuaki  ; Toyoshima, Atsushi; Matsuda, Makoto  ; Makishima, Akiyasu*; Shigematsu, Soichiro*; Kaneko, Junichi*; Shizuma, Toshiyuki; Tome, Hayato*; Hossain, I.*; Kono, Toshiyuki*; Ogawa, Masao*

We have measured deexcitation rays in Cm populated by one-neutron stripping reactions with a Cm target and a 162 MeV O, a 162 MeV O, and a 120 MeV C beams. rays in Cm were identified by measuring kinetic energies of outgoing particles using Si - detectors. It was demonstrated that high- orbitals were selectively populated in the (O,O) reaction having a large negative value. We have observed eight quasi-particle states above the deformed shell gap of . The 1/2[620], 1/2[750], and 7/2[613] bands were extended up to 19/2, 19/2, and 13/2 states, respectively. We have established the 9/2 9/2[615] state at 526 keV, the 9/2 9/2[604] state with a short life of ps at 1030 keV, and the 11/2 11/2[725] state with ns at 375 keV. Furthermore, the 17/2 1/2[880] state, having a large component of the spherical single-particle state, has been identified at 1505 keV. We discuss the properties of those quasi-particle states in the framework of a deformed shell model.