ENERGY AND ANGULAR DISTRIBUTIONS FOR THE Al$sup 27$(n,/cap alpha/)Na$sup 24$ REACTION WITH 14-Mev NEUTRONS

Journal Article · Mon Jul 01 04:00:00 EDT 1963 · Nuclear Physics (Netherlands) Divided into Nucl. Phys. A and Nucl. Phys. B

DOI:https://doi.org/10.1016/0029-5582(63)90061-0· OSTI ID:4677811

Jarvis, C J.D.; Dixon, W R; Storey, R S

The Al/sup 27/(n, alpha )Na/sup 24/ reaction at a neutron energy of 14.1 Mev was studied by the nuclear emulsion technique. As a result of careful shielding of the emulsion, a thin alumi-num target could be used and it was possible to achieve an energy resolution of 4% at 9 Mev. The energy distribution of the alpha particles shows peaks corresponding to the first few energy levels in the residual Na nucleus. The emission of the low energy alpha particles is nearly isotropic, while in the higher energy region there is some preferential emission in the forward direction. Analysis of the energy and angular distributions indicates that the statistical theory is adequate to account for most of the alpha particles. The value of the spin cut-off parameter for the energy interval 4-7 Mev is found. The effect of Ericson fluctuations in the statistical analysis is discussed briefiy. The background tracks were also examined: highenergy alpha particles from heavy constituents of the emulsion are peaked strongly forward; low-energy alpha particles from light constituents are peaked in both the forward and backward directions. (auth)

• Research Organization: National Research Council, Ottawa
• NSA Number: NSA-17-031477
• OSTI ID: 4677811
• Journal Information: Nuclear Physics (Netherlands) Divided into Nucl. Phys. A and Nucl. Phys. B, Journal Name: Nuclear Physics (Netherlands) Divided into Nucl. Phys. A and Nucl. Phys. B Vol. Vol: 44; ISSN NUPHA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ENERGY RANGE
ERICSON FLUCTUATIONS
PHYSICS