KΠ=0+ and 4 Two-Phonon γ-Vibrational States in 166Er

P. E. Garrett, M. Kadi, Min Li, C. A. McGrath, V. Sorokin, Minfang Yeh, S. W. Yates

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67 Scopus citations

Abstract

The (n, n’γ) reaction has been used to search for two-phonon γ-vibrational states in 166Er. Levels at 1943 and 2028 keV have been observed with collective transitions to the γ band. The latter, which has B(E2;2028→2γ+)=7.4±2.5 W.u. (Weisskopf unit) is interpreted as the I, KΠ=4,4+ two- γ-phonon state. The former, for which the data indicate spin 0, has B(E2;1943→2γ+)=21±6 W.u. and is interpreted as the I, KΠ=0,0+ two- γ-phonon state. This is the first observation of the KΠ=0+ two-γ-phonon state in a well-deformed nucleus, and its identification places stringent limits on the nuclear models.

Original languageEnglish
Pages (from-to)4545-4548
Number of pages4
JournalPhysical Review Letters
Volume78
Issue number24
DOIs
StatePublished - Jun 16 1997

ASJC Scopus subject areas

  • General Physics and Astronomy

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