Nuclear level densities and {gamma}-ray strength functions in {sup 44,45}Sc

Journal Article · Mon Oct 15 04:00:00 EDT 2007 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.76.044303· OSTI ID:21067788

Larsen, A C; Guttormsen, M; Ingebretsen, F; Messelt, S; Rekstad, J; Siem, S; Syed, N U. H. ^[1]; Chankova, R ^[2]; Loennroth, T ^[3]; Schiller, A ^[4]; Voinov, A ^[5]

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1. Department of Physics, University of Oslo, P. O. Box 1048 Blindern, N-0316 Oslo (Norway)
2. North Carolina State University, Raleigh, North Carolina 27695, USA and Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708 (United States)
3. Department of Physics, Angstrombo Akademi University, FIN-20500 Angstrombo (Finland)
4. National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824 (United States)
5. Department of Physics and Astronomy, Ohio University, Athens, Ohio 45701 (United States) and Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, RU-141980 Dubna, Moscow region (Russian Federation)

The scandium isotopes {sup 44,45}Sc were studied with the {sup 45}Sc({sup 3}He, {alpha}{gamma}){sup 44}Sc and {sup 45}Sc({sup 3}He, {sup 3}He{sup '}{gamma}){sup 45}Sc reactions, respectively. The nuclear level densities and {gamma}-ray strength functions have been extracted using the Oslo method. The experimental level densities are compared to calculated level densities obtained from a microscopic model based on BCS quasiparticles within the Nilsson level scheme. This model also gives information about the parity distribution and the number of broken Cooper pairs as a function of excitation energy. The experimental {gamma}-ray strength functions are compared to theoretical models of the E1, M1, and E2 strength and to data from ({gamma}, n) and ({gamma},p) experiments. The strength functions show an enhancement at low {gamma} energies that cannot be explained by the present standard models.

• OSTI ID: 21067788
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 4 Vol. 76; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
COOPER PAIRS
DISTRIBUTION
E1-TRANSITIONS
E2-TRANSITIONS
ENERGY LEVELS
ENERGY-LEVEL DENSITY
EXCITATION
GAMMA RADIATION
HELIUM 3
HELIUM 3 REACTIONS
M1-TRANSITIONS
NUCLEAR STRUCTURE
PARITY
QUASI PARTICLES
SCANDIUM 44
SCANDIUM 45
SCANDIUM 45 TARGET
STRENGTH FUNCTIONS