DIFFERENTIAL CROSS SECTIONS OF THE Be$sup 9$(Li$sup 6$$,$$alpha$)B$sup 11$ REACTION

Journal Article · Sun Jan 01 04:00:00 EST 1961 · Physical Review (U.S.) Superseded in part by Phys.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.121.246· OSTI ID:4105870

Leigh, J J; Blair, J M

The differential cross sections of the Be/sup 9/(Li/sup 6/, alpha )B/sup 11/ reaction were measured as a function of energy and angle. The alpha particles leaving the B/sup 11/ in the ground state, alpha /sub 0/, in the first excited state, alpha /sub 1/, and in the second and third excited states, alpha /sub 2/ + alpha /sub 3/, were observed at l0 deg intervals from 10 to 160 deg (lab system) at Li/sup 6/ energies of 3.00, 3.25, and 3.50 Mev, and at 20, 60, 90, 120, and 160 deg (c.m. system) at Li/sup 6/ energies of 2.00, 2.50, 3.75, and 4.00 Mev. The angular distributions of the alpha /sub 0/ and alpha /sub 1/ groups are asymmetric about 90 deg c.m. Relative maxima occur at both large and small angles for each of the alpha -particle groups, with the yields at large angles being comparable to those at small angles. In all cases the angular distribution varies slowly with bombarding energy and the yields at each angle increase monotonically with increasing energy. At 3.50 Mev the total cross sections are 0.97 plus or minus 0.38 mb for alpha /sub 0/ and 0.65 plus or minus 0.26 mb for alpha i. The experimental results suggest that the reactions proceed mainly by direct-interaction mechanisms. The similarity of the angular distributions of the Be/sup 9/(Li/sup 6/, alpha )B/sup 11/ and the Be/sup 9/(He/ sup 3/,p)B/sup 11/ rea ctions is pointed out. (auth)

• Research Organization: Univ. of Minnesota, Minneapolis
• NSA Number: NSA-15-006859
• OSTI ID: 4105870
• Journal Information: Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: 121; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ALPHA PARTICLES
ANGULAR DISTRIBUTION
BERYLLIUM 9
BORON 11
CROSS SECTIONS
DIRECT REACTIONS
ENERGY
ENERGY LEVELS
ENERGY RANGE
HELIUM 3
ION BEAMS
IRRADIATION
LITHIUM 6
MEASURED VALUES
NUCLEAR REACTIONS
PHYSICS
PROTONS
REACTION KINETICS
VARIATIONS