Experimental study of mass asymmetry in subbarrier photofission of $sup 238$U

Journal Article · Mon Jan 01 04:00:00 EST 1973 · Nucl. Phys., A, v. A215, no. 3, pp. 461-470

OSTI ID:4422566

Alm, A; Kivikas, T

A measurement of symmetric and asymmetric photofission yields of /sup 238/U in the energy region from 9.5 to 6.5 MeV was performed. As gamma -source the bremsstrahlung from a microtron was used. The fission yields are obtained from BETA -counting of chemically separated isotopes /sup 111/Ag, /sup 115/Cd and /sup 117/Cd for symmetric fission and /sup 139/Ba for asymmetric fission. Some structures in the yield curves at about 5.3 MeV and a pronounced maximum at about 6.0 MeV in the valley-to-peak ratio in the fission fragment yield distribution are observed. It is suggested that these effects are connected with the double-hump fission barrier concept and indicate differences between fission barriers for symmetric and asymmetric fission. (auth)

• Research Organization: Univ. of Lund, Sweden
• NSA Number: NSA-29-009046
• OSTI ID: 4422566
• Journal Information: Nucl. Phys., A, v. A215, no. 3, pp. 461-470, Journal Name: Nucl. Phys., A, v. A215, no. 3, pp. 461-470; ISSN NUPAB
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

*BARIUM 139-- FISSION YIELD
*CADMIUM 115-- FISSION YIELD
*CADMIUM 117-- FISSION YIELD
*PHOTOFISSION
*SILVER 111-- FISSION YIELD
*URANIUM 238-- PHOTOFISSION
ASYMMETRY
DISTRIBUTION
MASS
MEV RANGE 01-10
N69161* --Physics (Nuclear
Experimental)--Nuclear Properties & Reactions
A >= 220--Nuclear Reactions & Scattering--Spontaneous & Induced Fission:734
SYMMETRY