THE B$sup 11$$($$alpha$,n)N$sup 14$ REACTION (thesis)
Technical Report
·
OSTI ID:4244450
He/sup +/ ions from the large Los Alamos electrostatic accelerator were used to bombard thin B/sup 11/ targets, and the resulting neutron spectra were measured by a timeof-flight method. The absolute zero-degree differential cross section was obtained for the B/sup 11/( alpha ,n/sub 0/)N/sup 14/ rcaction for the alpha-particle energy range from 1.9 to 6.9 Mev, the B/sup 11/( alpha ,n/sub 2/)N/sup 14*/ reaction from 3.5 to 6.9 Mev, and the B/sup 11/( alpha ,n/sub 2/)N/ sup 14*/ reaction from 5.3 to 6.9 Mev. Resonances were found in thi; zero degree cross section curves at excitation energies in N/sup 15/ corresponding to 12.51, 12.90, l3.14, 13.17, 13.36, 13.60, 13.71, 13.85, 14.08, 14.l6, obtained for the neutrons associated with the ground state transition for the alpha-particle energy range from 1.92 to 5.72 Mev and for the first excited state from 3.73 to 4.74 Mev. From the angular distributions, values for the total reaction cross section were obtained for the B/sup 11/( alpha ,n/sub 0/)N/sup 14/ reaction for the energy region from 1.92 to 5.72 Mev. The angular distributions for alphaparticle energies above 2.05 Mev were found to exhibit asymmetry about 90 in the center-of-mass system while the angular distribution at 2.05 Mev was symmetric about 90 . A theoretical analysis of the 12.50-Mev state in N/sup 15/ led to a spin and parity assignment of 5+/2. Qualitative arguments are used to show that the 12.90Mev state in N/sup 15/ is not a pure state. (auth)
- Research Organization:
- Los Alamos Scientific Lab., N. Mex.
- DOE Contract Number:
- W-7405-ENG-36
- NSA Number:
- NSA-13-014781
- OSTI ID:
- 4244450
- Report Number(s):
- AECU-4126
- Country of Publication:
- United States
- Language:
- English
Similar Records
ANALYSIS OF ANGULAR DISTRIBUTIONS IN THE REACTION B$sup 11$(/cap alpha/ ,p)C$sup 1$$sup 4$
sup 11 B( sup 7 Li, t ) and the ( p ,. pi. sup + ) reaction
LEVELS IN N$sup 15$ FROM B$sup 11$(/cap alpha/,p$sub 0$)C$sup 14$ REACTION
Journal Article
·
Wed Jul 01 00:00:00 EDT 1959
· Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D
·
OSTI ID:4201301
sup 11 B( sup 7 Li, t ) and the ( p ,. pi. sup + ) reaction
Journal Article
·
Mon Dec 31 23:00:00 EST 1990
· Physical Review, C (Nuclear Physics); (USA)
·
OSTI ID:6395214
LEVELS IN N$sup 15$ FROM B$sup 11$(/cap alpha/,p$sub 0$)C$sup 14$ REACTION
Journal Article
·
Mon Jul 01 00:00:00 EDT 1963
· Nuclear Physics (Netherlands) Divided into Nucl. Phys. A and Nucl. Phys. B
·
OSTI ID:4698228
Related Subjects
ALPHA PARTICLES
ANGULAR DISTRIBUTION
ANISOTROPY
BORON 11
CROSS SECTIONS
ENERGY LEVELS
ENERGY RANGE
EXCITATION
ION BEAMS
MEASURED VALUES
NEUTRON SPECTROMETERS
NEUTRONS
NITROGEN 14
NUCLEAR REACTIONS
PARITY
PHYSICS AND MATHEMATICS
QUANTUM MECHANICS
RESONANCE
SPECTRA
TARGETS
TRANSIENTS
VAN DE GRAAFF ACCELERATORS
VELOCITY
ANGULAR DISTRIBUTION
ANISOTROPY
BORON 11
CROSS SECTIONS
ENERGY LEVELS
ENERGY RANGE
EXCITATION
ION BEAMS
MEASURED VALUES
NEUTRON SPECTROMETERS
NEUTRONS
NITROGEN 14
NUCLEAR REACTIONS
PARITY
PHYSICS AND MATHEMATICS
QUANTUM MECHANICS
RESONANCE
SPECTRA
TARGETS
TRANSIENTS
VAN DE GRAAFF ACCELERATORS
VELOCITY