Distribution of spin dipole transition strength in the sup 15 N( n , p ) sup 15 C reaction

Journal Article · Fri Feb 01 04:00:00 EST 1991 · Physical Review, C (Nuclear Physics); (USA)

DOI:https://doi.org/10.1103/PhysRevC.43.639· OSTI ID:5753542

Celler, A; Alford, W P; Abegg, R; Frekers, D; Haeusser, O; Helmer, R; Henderson, R S; Jackson, K P; Jeppesen, R; Larson, B; Mildenberger, J; Pointon, B W; Trudel, A; Vetterli, M; Yen, S ^[1]

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1. University of Western Ontario, London, Ontario, Canada N6A 3K7 (CA) TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, Canada V6T 2A3 Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6 University of Melbourne, Parkville, Victoria, Australia 3052

The reaction {sup 15}N({ital n},{ital p}){sup 15}C was studied at a neutron energy of 288 MeV using the TRIUMF ({ital n},{ital p}) charge-exchange facility and a high-pressure gas target. The angular distributions for spin dipole ({Delta}{ital L}=1) transitions to the states in {sup 15}C at energies 0 and 0.740 MeV, as well as for higher excitation energies, were measured and the results were compared with distorted-wave impulse approximation calculations. The measured distribution of the spin dipole strength agrees well with shell-model predictions, indicating that a rather simple model provides a satisfactory description of the {sup 15}N ground state, and of positive-parity states in {sup 15}C up to about 18 MeV excitation. The magnitude of the peak cross sections (at {congruent}7{degree}) is described well by the calculations when the theoretical cross section is renormalized by a factor of 0.7. The calculated cross sections near 0{degree} are generally smaller than experimental data. If this is a general feature of {Delta}{ital L}=1 transitions, it suggests that estimates of Gamow-Teller strength based on a multipole decomposition of measured cross sections may be too high.

• OSTI ID: 5753542
• Journal Information: Physical Review, C (Nuclear Physics); (USA), Journal Name: Physical Review, C (Nuclear Physics); (USA) Vol. 43:2; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACCELERATORS
ANGULAR DISTRIBUTION
ANGULAR MOMENTUM
BARYON REACTIONS
BARYONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CARBON 15
CARBON ISOTOPES
CHARGE-EXCHANGE REACTIONS
CROSS SECTIONS
CYCLIC ACCELERATORS
CYCLOTRONS
DISTORTED WAVE THEORY
DISTRIBUTION
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY RANGE
EVEN-ODD NUCLEI
FERMIONS
GAMOW-TELLER RULES
HADRON REACTIONS
HADRONS
IMPULSE APPROXIMATION
ISOCHRONOUS CYCLOTRONS
ISOTOPES
LIGHT NUCLEI
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 100-1000
NEUTRON REACTIONS
NITROGEN 15 TARGET
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUCLEONS
PARITY
PARTICLE PROPERTIES
PROTONS
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
SHELL MODELS
SPIN
TARGETS
TRIUMF CYCLOTRON