Observation of high-j quasiparticle states in Cm249 by in-beam γ-ray spectroscopy using heavy-ion transfer reactions

T. Ishii, H. Makii, M. Asai, K. Tsukada, A. Toyoshima, M. Matsuda, A. Makishima, S. Shigematsu, J. Kaneko, T. Shizuma, H. Toume, I. Hossain, T. Kohno, M. Ogawa

Research output: Contribution to journalArticle

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Abstract

We have measured de-excitation γ rays in Cm249 populated by one-neutron stripping reactions with a Cm248 target and 162-MeV O16, 162-MeV O18, and 120-MeV C13 beams. γ rays in Cm249 were identified by measuring kinetic energies of outgoing particles using Si ΔE-E detectors. It was demonstrated that high-j orbitals were selectively populated in the (O16, O15) reaction having a large negative Q value. We have observed eight quasiparticle states above the deformed shell gap of N=152. 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 9/2/2+[604] state with a short life of T1/22 ps at 1030 keV, and the 11/2,11/2-[725] state with T1/2=19(1) ns at 375 keV. Furthermore, the 17/21/2+[880] state, having a large component of the k17/2 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.

Original languageEnglish
Article number054309
JournalPhysical Review C - Nuclear Physics
Volume78
Issue number5
DOIs
Publication statusPublished - Nov 11 2008

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rays
heavy ions
stripping
spectroscopy
kinetic energy
neutrons
orbitals
detectors
excitation

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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Observation of high-j quasiparticle states in Cm249 by in-beam γ-ray spectroscopy using heavy-ion transfer reactions. / Ishii, T.; Makii, H.; Asai, M.; Tsukada, K.; Toyoshima, A.; Matsuda, M.; Makishima, A.; Shigematsu, S.; Kaneko, J.; Shizuma, T.; Toume, H.; Hossain, I.; Kohno, T.; Ogawa, M.

In: Physical Review C - Nuclear Physics, Vol. 78, No. 5, 054309, 11.11.2008.

Research output: Contribution to journalArticle

Ishii, T, Makii, H, Asai, M, Tsukada, K, Toyoshima, A, Matsuda, M, Makishima, A, Shigematsu, S, Kaneko, J, Shizuma, T, Toume, H, Hossain, I, Kohno, T & Ogawa, M 2008, 'Observation of high-j quasiparticle states in Cm249 by in-beam γ-ray spectroscopy using heavy-ion transfer reactions', Physical Review C - Nuclear Physics, vol. 78, no. 5, 054309. https://doi.org/10.1103/PhysRevC.78.054309
Ishii, T. ; Makii, H. ; Asai, M. ; Tsukada, K. ; Toyoshima, A. ; Matsuda, M. ; Makishima, A. ; Shigematsu, S. ; Kaneko, J. ; Shizuma, T. ; Toume, H. ; Hossain, I. ; Kohno, T. ; Ogawa, M. / Observation of high-j quasiparticle states in Cm249 by in-beam γ-ray spectroscopy using heavy-ion transfer reactions. In: Physical Review C - Nuclear Physics. 2008 ; Vol. 78, No. 5.
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AU - Tsukada, K.

AU - Toyoshima, A.

AU - Matsuda, M.

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AU - Shigematsu, S.

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AU - Shizuma, T.

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AB - We have measured de-excitation γ rays in Cm249 populated by one-neutron stripping reactions with a Cm248 target and 162-MeV O16, 162-MeV O18, and 120-MeV C13 beams. γ rays in Cm249 were identified by measuring kinetic energies of outgoing particles using Si ΔE-E detectors. It was demonstrated that high-j orbitals were selectively populated in the (O16, O15) reaction having a large negative Q value. We have observed eight quasiparticle states above the deformed shell gap of N=152. 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 9/2/2+[604] state with a short life of T1/22 ps at 1030 keV, and the 11/2,11/2-[725] state with T1/2=19(1) ns at 375 keV. Furthermore, the 17/21/2+[880] state, having a large component of the k17/2 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.

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