$Z$ dependence of the $N=152$ deformed shell gap: In-beam \ensuremath{\gamma}-ray spectroscopy of neutron-rich $^{245,246}\mathrm{Pu}$

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$Z$ dependence of the $N = 152$ deformed shell gap: In-beam γ-ray spectroscopy of neutron-rich ${}^{245, 246}{Pu}$

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

Phys. Rev. C 76, 061301(R) – Published 3 December 2007

Abstract

We have measured in-beam γ rays in the neutron-rich $^{246} {Pu}_{152}$ and $^{245} {Pu}_{151}$ nuclei by means of ${}^{244}{Pu}$ ( ${}^{18}O$ , ${}^{16}O$ ) ${}^{246}{Pu}$ and ${}^{244}{Pu}$ ( ${}^{18}O$ , ${}^{17}O$ ) ${}^{245}{Pu}$ neutron transfer reactions, respectively. The γ rays emitted from ${}^{246}{Pu}$ ( ${}^{245}{Pu}$ ) were identified by selecting the kinetic energy of scattered ${}^{16}O$ ( ${}^{17}O$ ) detected by Si $Δ E - E$ detectors. The ground-state band of ${}^{246}{Pu}$ was established up to the $12^{+}$ state. We have found that the shell gap of $N = 152$ is reduced in energy with decreasing atomic number by extending the systematics of the one-quasiparticle energies in $N = 151$ nuclei into those in ${}^{245}{Pu}$ . This reduction of the shell gap clearly affects the $2^{+}$ energy of the ground-state band of ${}^{246}{Pu}$ .

Received 2 February 2007

DOI:https://doi.org/10.1103/PhysRevC.76.061301

Authors & Affiliations

H. Makii^1,*, T. Ishii¹, M. Asai¹, K. Tsukada¹, A. Toyoshima¹, M. Matsuda², A. Makishima³, J. Kaneko⁴, H. Toume^1,5, S. Ichikawa¹, S. Shigematsu⁶, T. Kohno⁶, and M. Ogawa^7,†

¹Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
²Department of Research Reactor and Tandem Accelerator, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
³National Defense Medical College, Tokorozawa, Saitama 359-8513, Japan
⁴Department of Radiological Sciences, Komazawa University, Setagaya, Tokyo 154-8525, Japan
⁵College of Science, Ibaraki University, Mito, Ibaraki 310-8512, Japan
⁶Department of Energy Sciences, Tokyo Institute of Technology, Yokohama, Kanagawa 226-8502, Japan
⁷Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, Meguro, Tokyo 152-8550, Japan

^*makii.hiroyuki@jaea.go.jp
^†Present address: Department of Radiological Sciences, Komazawa University, Setagaya, Tokyo 154-8525, Japan.

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Vol. 76, Iss. 6 — December 2007

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Physical Review C

covering nuclear physics

$Z$ dependence of the $N = 152$ deformed shell gap: In-beam γ-ray spectroscopy of neutron-rich ${}^{245, 246}{Pu}$

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

Phys. Rev. C 76, 061301(R) – Published 3 December 2007

Abstract

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Physical Review C

covering nuclear physics

Z dependence of the N=152 deformed shell gap: In-beam γ-ray spectroscopy of neutron-rich Pu245,246

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

Phys. Rev. C 76, 061301(R) – Published 3 December 2007

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$Z$ dependence of the $N = 152$ deformed shell gap: In-beam γ-ray spectroscopy of neutron-rich ${}^{245, 246}{Pu}$