Ultrahigh resolution study of collective modes in {sup 158}Gd
- Institut Laue-Langevin, F-38042 Grenoble (France)
- Wright Nuclear Structure Laboratory (WNSL), Yale University, New Haven, Connecticut 06520 (United States)
- Clark University, Worcester, Massachusetts 01610 (United States)
- Charles University, CZ-18000 Prague (Czech Republic)
- Bulgarian Academy of Sciences, Institute for Nuclear Research and Nuclear Energy, 1784 Sofia (Bulgaria)
Ultraprecise energies and absolute B(E2) values associated with K=0{sup +} excitations in {sup 158}Gd, measured with the GRID technique, reveal significant information relating to the possible existence or absence of two-phonon vibrational excitations in deformed nuclei. A strong B(E2:K=0{sub 2}{sup +}{r_arrow}{gamma}) is observed but reflects band mixing rather than a {gamma}{gamma} mode. For the K=0{sub 3}{sup +} band, measurement of precise {gamma} transition energies shows that suggested existing placements of strong deexcitation transitions are incorrect and that there is, again, no evidence for {gamma}{gamma}-phonon character in this band either. A weak B(E1:K=1{sup {minus}}{r_arrow}K=0{sub 1}{sup +}) value is interpreted in terms of the microscopic structure of K=0{sup {minus}} and K=1{sup {minus}} excitations. {copyright} {ital 1999} {ital The American Physical Society}
- OSTI ID:
- 337574
- Journal Information:
- Physical Review, C, Journal Name: Physical Review, C Journal Issue: 5 Vol. 59; ISSN 0556-2813; ISSN PRVCAN
- Country of Publication:
- United States
- Language:
- English
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