Particle-hole strength excited in the /sup 48/Ca(p,n)/sup 48/Sc reaction at 134 and 160 MeV: (. pi. f/sub 7/2/,. nu. f/sub 7/2//sup -1/) band

Journal Article · Mon Apr 01 04:00:00 EST 1985 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.31.1147· OSTI ID:5885689

Anderson, B D; Chittrakarn, T; Baldwin, A R; Lebo, C; Madey, R; McCarthy, R J; Watson, J W; Brown, B A; Foster, C C

The /sup 48/Ca(p,n)/sup 48/Sc reaction was studied at 134 and 160 MeV. Neutron energy spectra were measured by the time-of-flight technique with resolutions from 320 to 460 keV at 11 angles from 0/sup 0/ to 60/sup 0/ spaced approximately 6/sup 0/ apart. The neutron spectra reveal strong excitation of the (..pi..f/sub 7/2/,..nu..f/sub 7/2//sup -1/) band of states at low excitation energies; five of the known eight members of the band are excited strongly, generally consistent with distorted-wave-impulse-approximation calculations with 1f-2p shell-model wave functions. The normalization of the distorted-wave-impulse-approximation calculations to the extracted angular distributions at 135 MeV vary from 0.40 for the 5/sup +/ state to 0.93 for the 0/sup +/, isobaric analog state. The normalization factor of 0.60 required for the 7/sup +/, stretched-state transition is significantly larger than those required for similar distorted-wave-impulse-approximation calculations of various stretched-state excitations observed in inelastic proton scattering, which involve promoting a nucleon up into the next major shell (a ''1 h..omega..'' excitation). The larger normalization factor required for the (..pi..f/sub 7/2/,..nu..f/sub 7/2//sup -1/) 7/sup +/ excitation (a ''0 h..omega..'' excitation) indicates that this strength is more highly concentrated in a single state. The 4/sup +/ and 6/sup +/ states of this band are observed to be only weakly excited, consistent with predictions that transitions dominated by the tensor term of the nucleon-nucleon interaction will predominantly excite non-normal parity states.

• Research Organization: Department of Physics, Kent State University, Kent, Ohio 44242
• OSTI ID: 5885689
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 31:4; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACCELERATORS
ANGULAR DISTRIBUTION
ANGULAR MOMENTUM
BARYON REACTIONS
BARYON-BARYON INTERACTIONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CALCIUM 48 TARGET
CHARGE-EXCHANGE REACTIONS
CHARGED-PARTICLE REACTIONS
CYCLIC ACCELERATORS
CYCLOTRONS
DAYS LIVING RADIOISOTOPES
DISTORTED WAVE THEORY
DISTRIBUTION
ENERGY LEVELS
ENERGY RANGE
FUNCTIONS
HADRON REACTIONS
HADRON-HADRON INTERACTIONS
IMPULSE APPROXIMATION
INTERACTIONS
INTERMEDIATE MASS NUCLEI
ISOBARIC ANALOGS
ISOCHRONOUS CYCLOTRONS
ISOTOPES
IU CYCLOTRON
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 100-1000
NEUTRON SPECTRA
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUCLEON-NUCLEON INTERACTIONS
ODD-ODD NUCLEI
PARITY
PARTICLE INTERACTIONS
PARTICLE PROPERTIES
PARTICLE-HOLE MODEL
PROTON REACTIONS
RADIOISOTOPES
SCANDIUM 48
SCANDIUM ISOTOPES
SHELL MODELS
SPECTRA
SPIN
TARGETS
WAVE FUNCTIONS