NUCLEAR CHARGE DISTRIBUTION IN SYMMETRIC FISSION--Sn$sup 121$ INDEPENDENT YIELD

Technical Report · Mon Mar 18 04:00:00 EST 1963

OSTI ID:4694837

Wahl, A C; Nethaway, D R

Experiments in which tin was separated from indium in a freshly irradiated solution of U/sup 235/ gave evidence that In/sup 121/ isomers are formed in thermal-neutron fission of U/sup 253/. Separation was effected by precipitation, and the fraction of 27.5-hr Sn/sup 121/ growing from In/sip 121/ after the separation was determined. Decay constants of the two In/sup 121/ isomers and the fractions of 2.75-hr Sn/sup 121/ from each isomer were determined. Half lives of the isomers and values for the fractions were obtained by a least squares analysis of the data on an IBM 7072 computer. The half lives of 3.3 450 deg C in a 1.0 min and 29 450 deg C in a 8 sec agree well with other determinations, and a yield curve calculated from the values derived agrees well with experimental results. These results support the hypothesis that many prompt neutrons are evaporated from fragments of nearly equal mass. (D.C.W.)

• Research Organization: Washington Univ., St. Louis; California. Univ., Livermore. Lawrence Radiation Lab.
• DOE Contract Number: W-7405-ENG-48
• NSA Number: NSA-17-020995
• OSTI ID: 4694837
• Report Number(s): UCRL-7280
• Country of Publication: United States
• Language: English

Related Subjects

COMPUTERS
DECAY
DISTRIBUTION
ELECTRIC CHARGES
EVAPORATION
FISSION
HALF-LIFE
IBM 7074
INDIUM 121
IRRADIATION
ISOMERS
LEAST SQUARES
MASS
MATHEMATICS
NEUTRONS
NUCLEAR STRUCTURE
NUMERICALS
PHYSICS
PRECIPITATION
PROGRAMMING
SEPARATION PROCESSES
SOLUTIONS
TIN 121
URANIUM 235