Revised spin-parity assignment and a new interpretation of the high-spin isomer in 151Er

T. Fukuchi, T. Hori, T. Masue, K. Tajiri, A. Sato, T. Furukawa, A. Odahara, T. Shimoda, Y. Wakabayashi, Y. Gono, T. Suzuki, M. Ukai, Takashi Wakui, A. Yamazaki, Y. Miyashita, N. Sato, M. Tateoka, M. Ohguma, T. Shinozuka, T. KoikeK. Shirotori, Y. Miura, S. Kinoshita, Y. Ma, Y. Y. Fu, H. Tamura

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3 Citations (Scopus)

Abstract

The high-spin isomer in 151Er ( E x = 10.3 MeV, T 1/2 = 420 ns) has been studied by the 116Sn ( 40Ar , 5n) 151Er reaction at 197MeV. From the γ coincidence relations, a new transition with an energy of 1514keV was found. This finding requires the revision of the spin-parity assignment from previous 67/2- to 61/2+ or 65/2- . The 61/2+ assignment is the one which was predicted by the deformed independent particle model as an isomer with a large oblate deformation (β = - 0.17of the [ν(f7/2h9/2 I 13/2) π(h411/2)] 61/2+ configuration. The isomerism may be attributed to the sudden shape change of the isomer from the nearly spherical shape of the lower-spin yrast states to the oblate shape.

Original languageEnglish
Pages (from-to)49-51
Number of pages3
JournalEuropean Physical Journal A
Volume39
Issue number1
DOIs
Publication statusPublished - 2009 Jan 1

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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    Fukuchi, T., Hori, T., Masue, T., Tajiri, K., Sato, A., Furukawa, T., Odahara, A., Shimoda, T., Wakabayashi, Y., Gono, Y., Suzuki, T., Ukai, M., Wakui, T., Yamazaki, A., Miyashita, Y., Sato, N., Tateoka, M., Ohguma, M., Shinozuka, T., ... Tamura, H. (2009). Revised spin-parity assignment and a new interpretation of the high-spin isomer in 151Er. European Physical Journal A, 39(1), 49-51. https://doi.org/10.1140/epja/i2008-10692-4