TY - JOUR
T1 - KΠ=0+ and 4 Two-Phonon γ-Vibrational States in 166Er
AU - Garrett, P. E.
AU - Kadi, M.
AU - Li, Min
AU - McGrath, C. A.
AU - Sorokin, V.
AU - Yeh, Minfang
AU - Yates, S. W.
PY - 1997/6/16
Y1 - 1997/6/16
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevLett.78.4545
DO - 10.1103/PhysRevLett.78.4545
M3 - Article
AN - SCOPUS:0000134266
SN - 0031-9007
VL - 78
SP - 4545
EP - 4548
JO - Physical Review Letters
JF - Physical Review Letters
IS - 24
ER -