HALOGEN DELAYED-NEUTRON ACTIVITIES

Journal Article · Sun Mar 01 04:00:00 EST 1959 · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D

DOI:https://doi.org/10.1103/PhysRev.113.1269· OSTI ID:4251207

Perlow, G J; Stehney, A F

A gas-flow technique was developed to make rapid chemical separation of bromine and of iodine fission products from a solution of U/sup 235/ irradiated with thermal neutrons. The active bromine or iodine is observed by its delayed neutron emission. Analysis of the decay curves so obtained was made by graphical and by computer methods. Four delayed-neutron periods were found in the bromine fraction and three in the iodine. Including several already well known, the half- lives and probable mass assignments are as follows: 54.5-sec Br/sup 87/, 16.3-sec Br/sup 88/, 4.4-sec Br/sup 89/ and 1.6-scc Br/sup 90/; 24.4-sec I/sup 137/, 6.3- sec I/sup 138/ and 2.0-scc I/sup 139/. Shorterlived halogens would not have been detected. The relative yields of each neutron activity in the ordcr of decreasing half-life are, for bromine, 0.37: 1.0:1.9: 1.5; while for iodine they are 1.0:0.47:0.38 in the same order. If it is assumed that there are no other important contributors of delayed neutrons in this half-life ranges the numerical values of yields for bromine may be compared directly with those for iodine with an uncertainty of a factor of 2. (auth)

• Research Organization: Argonne National Lab., Lemont, Ill.
• NSA Number: NSA-13-013916
• OSTI ID: 4251207
• Journal Information: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 113; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

BROMINE
BROMINE 87
BROMINE 88
BROMINE 89
BROMINE 90
DELAYED NEUTRONS
EFFICIENCY
FISSION PRODUCTS
GAS FLOW
HALF-LIFE
HALOGENS
IODINE
IODINE 137
IODINE 138
IODINE 139
MASS
MEASURED VALUES
NEUTRON DETECTION
PHYSICS AND MATHEMATICS
QUALITATIVE ANALYSIS
RADIOACTIVITY
SOLUTIONS
THERMAL NEUTRONS
URANIUM 235