Decay history and magnetic moments at high spin in sup 152 Dy

Journal Article · Tue Oct 01 04:00:00 EDT 1991 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.44.1397· OSTI ID:5022798

Hass, M ^[1]; Benczer-Koller, N; Kumbartzki, G ^[2]; Lauritsen, T; Khoo, T L; Ahmad, I; Carpenter, M P; Janssens, R V.F.; Moore, E F; Wolfs, F L.H. ^[3]; Benet, P ^[4]; Beard, K ^[5]

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1. Nuclear Structure Research Laboratory, University of Rochester, Rochester, New York (USA)
2. Rutgers University, New Brunswick, New Jersey (USA)
3. Argonne National Laboratory, Argonne, Illinois (USA)
4. Purdue University, West Lafayette, Indiana (USA)
5. University of Notre Dame, Notre Dame, Indiana (USA)

Average magnetic moments as well as information on the time evolution of the continuum structure of {sup 152}Dy at high spin have been obtained using the transient hyperfine magnetic field acting on fast ions traversing a thin, magnetized gadolinium foil. {sup 152}Dy nuclei were populated by the {sup 76}Ge({sup 80}Se,4{ital n}){sup 152}Dy fusion-evaporation reaction at {ital E}({sup 80}Se)=326.5 MeV. The target-ferromagnet arrangement corresponds to a time window of about 70{lt}{ital t}{lt}1100 fs, during which the excited nuclei experience the transient field interaction. The statistical {gamma} rays, as well as the high-energy, {ital E}{sub {gamma}}{gt}1200 keV, {gamma} rays contributing to the collective {ital E}2 bump,'' exhibit a negligible precession, in accordance with the very short lifetimes of these states. The precession of the angular distribution of discrete yrast {gamma} rays deexciting the nucleus from spin {ital I}{similar to}35{h bar} down yields an average magnetic moment for states with 43{h bar}{ge}{ital I}{ge}31{h bar}. The resulting {l angle}{ital g}{r angle}=0.21(2) is considerably lower than the collective value {ital Z}/{ital A}{similar to}0.43 and indicates an appreciable contribution from aligned neutrons to the lower-spin region populated within the above time frame. The results are discussed in the framework of model calculations of the {gamma}-ray cascade.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL
• DOE Contract Number: FG02-87ER40346
• OSTI ID: 5022798
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 44:4; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA DECAY RADIOISOTOPES
BARYONS
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CHARGED-PARTICLE REACTIONS
DATA
DYSPROSIUM 152
DYSPROSIUM ISOTOPES
ELECTRON CAPTURE RADIOISOTOPES
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY RANGE
EVEN-EVEN NUCLEI
EXPERIMENTAL DATA
FERMIONS
GAMMA SPECTRA
GERMANIUM 76 TARGET
HADRONS
HEAVY ION FUSION REACTIONS
HEAVY ION REACTIONS
HIGH SPIN STATES
HOURS LIVING RADIOISOTOPES
INFORMATION
INTERMEDIATE
ISOTOPES
MAGNETIC MOMENTS
MEV RANGE
MEV RANGE 100-1000
NEUTRONS
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
NUMERICAL DATA
RADIOISOTOPES
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
SELENIUM 80 REACTIONS
SPECTRA
TARGETS