Photoexcitation of low-lying dipole transitions in sup 236 U

Journal Article · Wed Aug 01 00:00:00 EDT 1990 · Physical Review, C (Nuclear Physics); (USA)

DOI:https://doi.org/10.1103/PhysRevC.42.771· OSTI ID:6603641

Margraf, J; Degener, A; Friedrichs, H; Heil, R D; Jung, A; Kneissl, U; Lindenstruth, S; Pitz, H H; Schacht, H; Seemann, U; Stock, R; Wesselborg, C ^[1]; von Brentano, P; Zilges, A ^[2]

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1. Institut fuer Kernphysik, Universitaet Giessen, D-6300 Giessen (Federal Republic of Germany)
2. Institut fuer Kernphysik, Universitaet zu Koeln, D-5000 Koeln (Federal Republic of Germany)

Nuclear resonance fluorescence experiments have been performed on the deformed actinide nucleus {sup 236}U. 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{degree}, 128{degree}, and 150{degree}, 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 {ital scissors} {ital mode} observed as a result of the previous ({gamma},{gamma}{prime}) and (e,e{prime}) experiments on {sup 232}Th and {sup 238}U and, in particular, their combined analysis suggests likewise to attribute these new dipole excitations in {sup 236}U to the orbital {ital M}1 scissors mode.

• OSTI ID: 6603641
• Journal Information: Physical Review, C (Nuclear Physics); (USA), Journal Name: Physical Review, C (Nuclear Physics); (USA) Vol. 42:2; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

652020* -- Nuclear Properties & Reactions
A=220 & above
Experimental
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ALPHA DECAY RADIOISOTOPES
AMPLITUDES
ANGULAR DISTRIBUTION
BEAMS
BRANCHING RATIO
BREMSSTRAHLUNG
DATA
DECAY
DISTRIBUTION
ELECTROMAGNETIC RADIATION
ELECTRON BEAMS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
EXPERIMENTAL DATA
FLUORESCENCE
GE SEMICONDUCTOR DETECTORS
HEAVY NUCLEI
INFORMATION
ISOTOPES
LEPTON BEAMS
LUMINESCENCE
M1-TRANSITIONS
MEASURING INSTRUMENTS
MULTIPOLE TRANSITIONS
NUCLEAR REACTIONS
NUCLEI
NUMERICAL DATA
PARTICLE BEAMS
PHOTONUCLEAR REACTIONS
RADIATION DETECTORS
RADIATIONS
RADIOISOTOPES
RESONANCE FLUORESCENCE
SEMICONDUCTOR DETECTORS
URANIUM 236
URANIUM ISOTOPES
YEARS LIVING RADIOISOTOPES