Photoexcitation of low-lying dipole transitions in 236U

Nuclear resonance fluorescence experiments have been performed on the deformed actinide nucleus 236U. Bremsstrahlung of 3.9 MeV endpoint energy has been used as the photon source. The scattered photons were detected by t
Nuclear resonance fluorescence experiments have been performed on the deformed actinide nucleus 236U. Bremsstrahlung of 3.9 MeV endpoint energy has been used as the photon source. The scattered photons were detected by three high resolution Ge- gamma -spectrometers installed at scattering angles of 92°, 128°, and 150°, respectively. Precise excitation energies, decay branching ratios, and ground state decay widths of numerous previously unknown spin 1 states in the excitation energy range 1.8-3.2 MeV have been extracted. The dipole strength has been found to be concentrated in the energy range 2.1-2.5 MeV. The systematics of the so-called scissors mode observed as a result of the previous ( gamma , gamma ') and (e,e') experiments on 232Th and 238U and, in particular, their combined analysis suggests likewise to attribute these new dipole excitations in 236U to the orbital M1 scissors mode.
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Metadaten
Author:J. Margraf, A. Degener, H. Friedrichs, R. D. Heil, A. Jung, U. Kneissl, S. Lindenstruth, H. H. Pitz, H. Schacht, U. Seemann, Reinhard Stock, C. Wesselborg
URN:urn:nbn:de:hebis:30-18722
Parent Title (German):Physical review C
Document Type:Article
Language:English
Date of Publication (online):2005/10/14
Year of first Publication:1990
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2005/10/14
Volume:42
Issue:2
Pagenumber:4
First Page:771
Last Page:774
Source:Phys. Rev. C 42, 771-774 (1990), ©1990 The American Physical Society, http://link.aps.org/abstract/PRC/v42/p771
HeBIS PPN:186973144
Institutes:Physik
Dewey Decimal Classification:530 Physik
Licence (German):License Logo Veröffentlichungsvertrag für Publikationen

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