Gamow-Teller strength in the sup 54 Fe( p , n ) sup 54 Co reaction at 135 MeV

Journal Article · Sun Apr 01 04:00:00 EDT 1990 · Physical Review, C (Nuclear Physics); (USA)

DOI:https://doi.org/10.1103/PhysRevC.41.1474· OSTI ID:7001512

Anderson, B D; Lebo, C; Baldwin, A R; Chittrakarn, T; Madey, R; Watson, J W ^[1]; Foster, C C ^[2]

---

1. Department of Physics, Kent State University, Kent, Ohio 44242 (USA)
2. Indiana University Cyclotron Facility, Bloomington, Indiana 47405 (USA)

The {sup 54}Fe({ital p},{ital n}){sup 54}Co reaction was studied at 135 MeV by the time-of-flight technique. Neutrons were detected with an energy resolution of 245 keV in large-volume, mean-timed counters at a flight path of 125 m. The forward-angle spectra are dominated by the excitation of 1{sup +} states with characteristic {Delta}{ital l}=0 angular distributions peaked at 0{degree}. The strengths of the 1{sup +} excitations are interpreted as being equivalent to Gamow-Teller (GT) strengths excited in beta decay. This strength is observed to be highly fragmented; GT strength is identified in more than 30 states. The {ital B}(GT{minus}) strength is obtained relative to the Fermi strength {ital B}(F) assumed to be concentrated in the 0{sup +}, isobaric-analog ground state. The total {ital B}(GT{minus}) strength observed in discrete states, combined with the {ital B}(GT+) strength obtained from the ({ital n},{ital p}) reaction, yields a lower limit of 48 percent of the 3({ital N}{minus}{ital Z}) sum rule. Inclusion of {Delta}{ital l}=0 strength in the background and continuum above a quasifree scattering background increases this lower limit to 73 percent. If one considers the {Delta}{ital l}=0 strength observed in the full background and continuum up to {ital E}{sub {ital x}}=25 MeV, the entire sum rule may be satisfied. The observed distribution of GT strength is in good agreement with a truncated 1{ital f}-2{ital p} shell-model calculation.

• OSTI ID: 7001512
• Journal Information: Physical Review, C (Nuclear Physics); (USA), Journal Name: Physical Review, C (Nuclear Physics); (USA) Vol. 41:4; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

651520* -- Nuclear Properties & Reactions
A=39-58
Experimental
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
BARYON REACTIONS
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CHARGE-EXCHANGE REACTIONS
CHARGED-PARTICLE REACTIONS
COBALT 54
COBALT ISOTOPES
DISTRIBUTION
ENERGY RANGE
EQUATIONS
FUNCTIONS
GAMOW-TELLER RULES
GIANT RESONANCE
HADRON REACTIONS
INTERMEDIATE MASS NUCLEI
IRON 54 TARGET
ISOTOPES
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 100-1000
MINUTES LIVING RADIOISOTOPES
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
ODD-ODD NUCLEI
PROTON REACTIONS
RADIOISOTOPES
RESONANCE
SECONDS LIVING RADIOISOTOPES
SHELL MODELS
STRENGTH FUNCTIONS
SUM RULES
TARGETS
TIME-OF-FLIGHT METHOD