Decay properties of short-lived neutron-rich halogen isotopes and their yields obtained in the thermal neutron fission of uranium (in German)
Thesis/Dissertation
·
OSTI ID:4357929
Thesis. The present paper reports data on the nuclear charge distribution of halogen isotopes in the 50- and 82-neutron shell range resulting from thermal neutron fission of /sup 235/U. A fully automated rapid gas- chromatographic system has been developed which allows the isolation of short- lived bromine and iodine isotopes by volatilization of their methyl compounds within a few seconds. By measurement of delayed neutrons as well as the gamma spectra of the halogens, the nuclides /sup 86/Br to /sup 92/Br and /sup 136g,m/I to /sup 141/I have been identified. The gamma lines of the noble gas daughters supported the mass assignment. Taking into account the decay data obtained in that way the relative independent bromine yields in the mass chain 87 to 92 with respect to /sup 90/Br as well as the relative iodine yields in the mass chain 136 to 141 with respect to /sup 138/I could be determined for the thermal fission reaction U(n,f). Moreover, a method is proposed for an evaluation of neutron emission probabilities of unknown neutron emitters, which is based on a relation to the maximum BETA -energy and the neutron binding energy. (86 figures, 89 tables, 179 references) (tr-auth)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-29-019786
- OSTI ID:
- 4357929
- Country of Publication:
- Germany
- Language:
- German
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AUTOMATION-- BROMINATED ALIPHATIC HYDROCARBONS-- BROMINE ISOTOPES-- GAS CHROMATOGRAPHY-- IODINE ISOTOPES-- ORGANIC BROMINE COMPOUNDS-- ORGANIC IODINE COMPOUNDS-- SECONDS LIVING RADIOISOTOPES
BROMINE ISOTOPES-- DELAYED NEUTRONS-- DISTRIBUTION-- EMISSION-- FISSION PRODUCTS-- FISSION YIELD-- GAMMA SPECTRA-- IODINE ISOTOPES-- MASS-- NEUTRON REACTIONS-- PROBABILITY-- THERMAL FISSION-- THERMAL NEUTRONS-- URANIUM 235
N40140 --Chemistry--Separation Procedures
N69161* --Physics (Nuclear
Experimental)--Nuclear Properties & Reactions
A >= 220--Nuclear Reactions & Scattering--Spontaneous & Induced Fission:734
BROMINE ISOTOPES-- DELAYED NEUTRONS-- DISTRIBUTION-- EMISSION-- FISSION PRODUCTS-- FISSION YIELD-- GAMMA SPECTRA-- IODINE ISOTOPES-- MASS-- NEUTRON REACTIONS-- PROBABILITY-- THERMAL FISSION-- THERMAL NEUTRONS-- URANIUM 235
N40140 --Chemistry--Separation Procedures
N69161* --Physics (Nuclear
Experimental)--Nuclear Properties & Reactions
A >= 220--Nuclear Reactions & Scattering--Spontaneous & Induced Fission:734