Compound contributions in the anomalous back-angle elastic scattering of alpha particles from /sup 40/Ca and /sup 44/Ca. [Excitation functions]

Journal Article · Sun Aug 01 04:00:00 EDT 1976 · Phys. Rev., C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.14.548· OSTI ID:7354445

Eberhard, K A; Braid, T H; Renner, T; Schiffer, J P; Vigdor, S

Excitation functions for ..cap alpha.. + /sup 40/,/sup 44/Ca elastic scattering have been measured with bombarding energies in the range of 20--27 MeV in 50-keV steps at several angles between 150 and 175degree. For /sup 40/Ca excitation functions were also taken in 10-keV steps over a limited interval. Statistical fluctuations were observed in all the excitation functions and were found to be generally stronger for /sup 44/Ca than for /sup 40/Ca. An analysis of the fluctuations yields a relative compound contribution of about 2% for /sup 40/Ca and greater than about 5% for /sup 44/Ca. The backward enhancement in ..cap alpha.. + /sup 40/Ca scattering, observed by many previous workers, is shown to arise primarily from a direct contribution and not from a fluctuating compound one. (AIP)

• Research Organization: Nuclear Physics Laboratory, University of Washington, Seattle, Washington 98195
• OSTI ID: 7354445
• Journal Information: Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 14:2; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

651525* -- Nuclear Properties & Reactions
A=39-58
Experimental-- Nuclear Reactions & Scattering-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA REACTIONS
ANGULAR DISTRIBUTION
BACKSCATTERING
CALCIUM 40 TARGET
CALCIUM 44 TARGET
CHARGED-PARTICLE REACTIONS
COMPOUND-NUCLEUS REACTIONS
CROSS SECTIONS
DISTRIBUTION
ELASTIC SCATTERING
ENERGY RANGE
EXCITATION FUNCTIONS
MATHEMATICS
MEV RANGE
MEV RANGE 10-100
NUCLEAR REACTIONS
SCATTERING
STATISTICS
TARGETS