L/K-CAPTURE RATIO IN Mn$sup 54$, Fe$sup 55$, Co$sup 57$, AND Co$sup 58$ DECAYS

Journal Article · Mon Jul 15 04:00:00 EDT 1963 · Physical Review (U.S.) Superseded in part by Phys.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.131.821· OSTI ID:4713547

Moler, R B; Fink, R W

The multiwire proportional counter method was applied to measurements of the L and K radiations arising from orbital electron-capture in gaseous sources of 290-day Mn/sup 54/, 2.6-yr Fe/sup 55/, 270-day Co/sup 57/, and 72-day Co/sup 58/. The presence of gamma transitions and positrons in the decay of Mn/sup 54/, Co/sup 57/, and Co/sup 58/ is shown not to interfere with an accurate measurement of the L/K-capture ratio. The experimental values of the L/K-capture ratio are 0.098 plus or minus Mn/sup 54/, Fe/sup 55/, Co/sup 57/, and Co/sup 58/, respectively. The result for Fe/sup 55/ is in excellent agreement with the earlier value measured by Scobie, Moler, and Fink, although the present value was corrected for counter escape somewhat more exactly. These values lie above the theoretical results of Brysk and Rose by some 9% for Mn/sup 54/, 9.3% for Fe/sup 55/, 7% for Co/sup 57/, and 17% for Co/sup 58/. These discrepancies are reduced by application of the exchange correction pointed out by Bahcall to the theoretical results of Brysk and Rose. This correction for the effect of exchange among the various electrons participating in the electron capture process apparently explains the well-established general discrepancy between the precision experimental values and the theory of Brysk and Rose. Remaining slight discrepancies probably can be traced to systematic experimental errors. (auth)

• Research Organization: Univ. of Arkansas, Fayetteville
• NSA Number: NSA-17-028325
• OSTI ID: 4713547
• Journal Information: Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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: 131; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

CAPTURE
COBALT 57
COBALT 58
DECAY
ELECTRONS
ERRORS
GAMMA RADIATION
GASES
HALF-LIFE
INTERACTIONS
IRON 55
MANGANESE 54
MEASURED VALUES
PHYSICS
POSITRONS
PROPORTIONAL COUNTERS
RADIATION SOURCES
TRANSITIONS