Ground-state bands of neutron-rich $^{236}\mathrm{Th}$ and $^{242}\mathrm{U}$ nuclei and implication of spherical shell closure at $N=164$

Rapid Communication

Ground-state bands of neutron-rich ${}^{236}{Th}$ and ${}^{242}U$ nuclei and implication of spherical shell closure at $N = 164$

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

Phys. Rev. C 76, 011303(R) – Published 10 July 2007

Abstract

The ground-state bands of the neutron-rich ${}^{236}{Th}$ and ${}^{242}U$ nuclei were established up to spin 10 and 8, respectively, by in-beam γ-ray spectroscopy using the ( ${}^{18}O$ , ${}^{20}{Ne}$ ) two-proton pickup reaction with a ${}^{238}U$ and a ${}^{244}{Pu}$ target. Deexcitation γ rays in ${}^{236}{Th}$ and ${}^{242}U$ were identified by selecting the kinetic energies of ${}^{20}{Ne}$ using Si $Δ E − E$ detectors. The excitation energies of the first $2^{+}$ states in U and Pu isotopes have local minima at $N ≃ 146$ , suggesting the possibility that nuclei with $Z ≃ 92$ have a spherical shell closure of $N = 164$ . Calculation using the Koura-Yamada single-particle potential gives an energy gap of 1.8 MeV at $N = 164$ for ${}^{256}U$ .

Received 26 December 2006

DOI:https://doi.org/10.1103/PhysRevC.76.011303

Authors & Affiliations

T. Ishii^1,*, H. Makii¹, M. Asai¹, H. Koura¹, S. Shigematsu², K. Tsukada¹, A. Toyoshima¹, M. Matsuda³, A. Makishima⁴, J. Kaneko^5,†, H. Toume^1,6, I. Hossain^7,‡, T. Shizuma⁸, S. Ichikawa¹, T. Kohno², and M. Ogawa^5,†

¹Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
²Department of Energy Sciences, Tokyo Institute of Technology, Yokohama 226-8502, Japan
³Department of Research Reactor and Tandem Accelerator, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
⁴Department of Liberal Arts and Sciences, National Defense Medical College, Tokorozawa, Saitama 359-8513, Japan
⁵Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, Meguro, Tokyo 152-8550, Japan
⁶College of Science, Ibaraki University, Mito, Ibaraki 310-8512, Japan
⁷Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
⁸Quantum Beam Science Directorate, Japan Atomic Energy Agency, Kyoto 619-0215, Japan

^*ishii.tetsuro@jaea.go.jp
^†Present address: Department of Radiological Sciences, Komazawa University, Setagaya, Tokyo 154-8525, Japan.
^‡On leave from Department of Physics, Shah Jalal University of Science and Technology, Sylhet 3114, Bangladesh.

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand

Issue

Vol. 76, Iss. 1 — July 2007

Reuse & Permissions

Access Options

Author publication services for translation and copyediting assistance advertisement

Physical Review C

covering nuclear physics

Ground-state bands of neutron-rich ${}^{236}{Th}$ and ${}^{242}U$ nuclei and implication of spherical shell closure at $N = 164$

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

Phys. Rev. C 76, 011303(R) – Published 10 July 2007

Abstract

Authors & Affiliations

Article Text (Subscription Required)

References (Subscription Required)

Issue

Access Options

Physical Review C

covering nuclear physics

Ground-state bands of neutron-rich Th236 and U242 nuclei and implication of spherical shell closure at N=164

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

Phys. Rev. C 76, 011303(R) – Published 10 July 2007

Abstract

Authors & Affiliations

Article Text (Subscription Required)

References (Subscription Required)

Issue

Access Options

Authorization Required

Other Options

Download & Share

Images

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Log In

Search

Article Lookup

Paste a citation or DOI

Enter a citation

Ground-state bands of neutron-rich ${}^{236}{Th}$ and ${}^{242}U$ nuclei and implication of spherical shell closure at $N = 164$