(p,n) ANGULAR DISTRIBUTIONS FROM MIRROR NUCLEUS TARGETS: C$sup 13$, B$sup 11$, AND Be$sup 9$

Journal Article · Mon May 01 04:00:00 EDT 1961 · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D

DOI:https://doi.org/10.1103/PhysRev.122.862· OSTI ID:4021060

Albert, R D; Bloom, S D; Glendenning, N K

Neutron angular distributions from the (p,n) reactions in C>s1/sup >,/ >s1/sup > /d Be>s9/sup /e measured using a long-counter detection technique in conjunction with the Livermore 90inch variable-energy cyclotron. Proton energies ranged from threshold (2.0 Mev to 3.2 Mev) up to 5.7 Mev. The aim here was to find qualitative experimental evidence bearing on the direct reaction mechanism proposed by Bloom, Glendenning, and Moszkowski wherein the (p,n) reaction connecting the ground states of mirror nuclei should go via a direct mode which is derived principally from the residual two-body interaction between the incoming proton and the bound neutron (or neutrons). It is found that the experimentul evidence supports this hypothesis in that the angular distribution changes slowly in the direction of increasing complexity with increasing energy, largely ignoring the occurrence of resonances except in their immediate vicinity. Also a tentative grouping by pairs of the (p,n) angular distributions for (C>s1/ sup >,/>s1/sup >)/nd (Be>s9/sup />s1/sup >/ s1/sup )/ shows marked similarities between the members of each pair in conformity with the twin-reaction picture stemming from the same theory. The comparison between theory and experiment is in general encouraging. It is found that a triplet-singlet interaction strength ratio is required here which is about 2/3 of that derived from the Gammel-Thaler phenomenological potential. However, in view of the basic differences between the free and the bound two-body problem it is felt that more knowledge will be required in order to properly compare the present results with the free- scattering analyses. (auth)

• Research Organization: Univ. of California, Livermore; and Univ. of California, Berkeley
• NSA Number: NSA-15-017599
• OSTI ID: 4021060
• Report Number(s): UCRL-6199; 0031-899X
• Journal Information: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 122; ISSN PHRVA
• Country of Publication: United States
• Language: English

Related Subjects

ANGULAR DISTRIBUTION
BERYLLIUM 9
BORON 11
CARBON 13
COUNTERS
CROSS SECTIONS
CYCLOTRONS
DIRECT REACTIONS
ENERGY
ENERGY RANGE
GAMMEL- THALER POTENTIAL
INTERACTIONS
MANY BODY PROBLEM
MEASURED VALUES
MIRROR NUCLEI
NEUTRON DETECTION
NEUTRONS
NITROGEN 15
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEAR THEORY
NUCLEI
PHYSICS
PROPORTIONAL COUNTERS
PROTON BEAMS
PROTONS
REACTION KINETICS
RESONANCE
SCATTERING
TARGETS