Observation of high-j quasiparticle states in {sup 249}Cm by in-beam {gamma}-ray spectroscopy using heavy-ion transfer reactions

Journal Article · Sat Nov 15 04:00:00 EST 2008 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.78.054309· OSTI ID:21199358

Ishii, T ^[1]; Makii, H ^[2]; Asai, M; Tsukada, K; Toyoshima, A ^[3]; Matsuda, M ^[1]; Makishima, A ^[4]; Shigematsu, S; Kohno, T ^[5]; Kaneko, J; Ogawa, M ^[6]; Shizuma, T ^[7]; Toume, H ^[3]; Hossain, I ^[8]

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1. Department of Research Reactor and Tandem Accelerator, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195 (Japan)
2. Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tokai, Ibaraki 319-1195 (Japan)
3. Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195 (Japan)
4. Department of Liberal Arts and Sciences, National Defense Medical College, Tokorozawa, Saitama 359-8513 (Japan)
5. Department of Energy Sciences, Tokyo Institute of Technology, Yokohama 226-8502 (Japan)
6. Department of Radiological Sciences, Komazawa University, Setagaya, Tokyo 154-8525 (Japan)
7. Quantum Beam Science Directorate, Japan Atomic Energy Agency, Kyoto 619-0215 (Japan)
8. Department of Physics, Osaka University, Toyonaka, Osaka 560-0043 (Japan)

We have measured de-excitation {gamma} rays in {sup 249}Cm populated by one-neutron stripping reactions with a {sup 248}Cm target and 162-MeV {sup 16}O, 162-MeV {sup 18}O, and 120-MeV {sup 13}C beams. {gamma} rays in {sup 249}Cm were identified by measuring kinetic energies of outgoing particles using Si {delta}E-E detectors. It was demonstrated that high-j orbitals were selectively populated in the ({sup 16}O, {sup 15}O) reaction having a large negative Q value. We have observed eight quasiparticle states above the deformed shell gap of N=152. The 1/2{sup +}[620], 1/2{sup -}[750], and 7/2{sup +}[613] bands were extended up to 19/2{sup +}, 19/2{sup -}, and 13/2{sup +} states, respectively. We have established the 9/2 9/2{sup +}[615] state at 526 keV, the 9/2 9/2{sup +}[604] state with a short life of T{sub 1/2}<<2 ps at 1030 keV, and the 11/2 11/2{sup -}[725] state with T{sub 1/2}=19(1) ns at 375 keV. Furthermore, the 17/2 1/2{sup +}[880] state, having a large component of the k{sub 17/2} spherical single-particle state, has been identified at 1505 keV. We discuss the properties of those quasiparticle states in the framework of a deformed shell model.

• OSTI ID: 21199358
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 5 Vol. 78; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BEAMS
CARBON 13
CURIUM 248
CURIUM 249
DE-EXCITATION
GAMMA RADIATION
GAMMA SPECTROSCOPY
HEAVY IONS
KEV RANGE
KINETIC ENERGY
MEV RANGE
NEUTRONS
OXYGEN 15
OXYGEN 16
OXYGEN 18
Q-VALUE
SHELL MODELS
SPHERICAL CONFIGURATION
STRIPPING
TRANSFER REACTIONS