MEASUREMENT OF THE CHAIN LENGTHS FOR THE /cap beta/ DECAY OF FISSION PRODUCTS FROM THE THERMAL FISSION OF U$sup 23$$sup 5$

Journal Article · Mon Jan 01 04:00:00 EST 1962 · Z. Physik

DOI:https://doi.org/10.1007/BF01378468· OSTI ID:4755836

Armbruster, P; Meister, H

The various masses of fission products from U/sup 235/ thermal fission were spacially separated by a helium filled magnetic mass separator. The number and energy of the BETA decays to the stable nuclides were counted and measured by a scintillation spectrometer. The time dependence of the BETA activity and BETA energy of the total of the U/sup 235/ fission products was measured. The number of BETA decays/fission was found to be (6.9 plus or minus 0.4) BETA particles fission, the energy liberated by BETA decays (8.1 plus or minus 0.4) Mev/fission. A calculation of the total BETA decay energy is given and compared with experimental data. The chain lengths of BETA -decay chains as a function of mass of the fission products were measured. Data on prompt neutron emission from fission products combined with the chainlength measurement give the mass dependence of the most probable charge of the primarily formed fission products. A recent model of asymmetric fission is shown to agree with the experimental data. The data give strong evidence that the filled nucleon shells of Z = 50 and N = 50 are responsible for the asymmetric fission mechanism. (auth)

• Research Organization: Technische Hochschule, Munich
• Sponsoring Organization: USDOE
• NSA Number: NSA-17-005407
• OSTI ID: 4755836
• Journal Information: Z. Physik, Journal Name: Z. Physik Vol. Vol: 170
• Country of Publication: Country unknown/Code not available
• Language: German

Related Subjects

BETA DECAY
CHARGED PARTICLES
EMISSION
ENERGY
FISSION PRODUCTS
HELIUM
MAGNETIC FIELDS
MASS
MASS SPECTROMETERS
MEASURED VALUES
NEUTRONS
NUCLEONS
PHYSICS
SCINTILLATIONS
SEPARATION PROCESSES
SHELLS
SPECTROMETERS
URANIUM 235