Higher excitation levels of sup 11 B via the sup 10 B( n , n ) sup 10 B and sup 10 B( n , n sup prime ) sup 10 B sup * (0. 72, 1. 74, 2. 15, 3. 59, 4. 77 MeV) reactions

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

DOI:https://doi.org/10.1103/PhysRevC.42.190· OSTI ID:6505460

Sadowski, E T; Knox, H D; Resler, D A; Lane, R O ^[1]

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1. Ohio University, Athens, OH (USA)

Differential cross sections for elastic and inelastic scattering of neutrons from isotopically enriched {sup 10}B samples have been measured for incident neutron energies from 3.02 to 6.45 MeV in 250 keV increments and from 7.02 to 12.01 MeV in 500 keV increments. Inelastic angular distributions for scattering to the states in parentheses in {sup 10}B have been measured from the indicated energy up to 12.01 MeV: (0.718) from 3.02 MeV; (1.74) from 3.27 MeV; (2.15) from 3.77 MeV; (3.59) from 5.52 MeV; (4.77) from 7.02 MeV. The measurements at 3.02, 3.51, 4.02, and 4.51 MeV were done at nine laboratory angles from 20{degree} to 158{degree} in 17.5{degree} increments with a sample that is isotopically 95.86% {sup 10}B. All other distributions measured scattering at 11 laboratory angles from 18{degree} to 158{degree} in 15{degree} increments from a sample that is isotopically 99.49% {sup 10}B. A multiple scattering code provided a simulation of the experimental scattering process allowing accurate corrections to the small measured inelastic cross sections. An eight-channel, multilevel {ital R}-matrix analysis was performed on the data. Level energies, spins, and parities were deduced for twelve levels above 13 MeV excitation in {sup 11}B. Only two definite and three tentative assignments for {ital T}=1/2 levels had been made previously above 13 MeV. The two definite levels were confirmed. Good agreement between the data and the {ital R}-matrix calculation in all analyzed channels was obtained for the proposed structure.

• OSTI ID: 6505460
• Journal Information: Physical Review, C (Nuclear Physics); (USA), Journal Name: Physical Review, C (Nuclear Physics); (USA) Vol. 42:1; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

651320* -- Nuclear Properties & Reactions
A=6-19
Experimental
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
ANGULAR MOMENTUM
BARYON REACTIONS
BORON 10 TARGET
BORON 11
BORON ISOTOPES
CROSS SECTIONS
DATA
DIFFERENTIAL CROSS SECTIONS
DISTRIBUTION
ELASTIC SCATTERING
ENERGY LEVELS
EXPERIMENTAL DATA
HADRON REACTIONS
INELASTIC SCATTERING
INFORMATION
ISOTOPES
LIGHT NUCLEI
MATHEMATICAL MODELS
MATRICES
NEUTRON REACTIONS
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUMERICAL DATA
ODD-EVEN NUCLEI
PARITY
PARTICLE PROPERTIES
R MATRIX
SCATTERING
SHELL MODELS
SPIN
STABLE ISOTOPES
TARGETS