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A double-focusing beta spectrometer for conversion electrons from (n,γ) processes. The conversion electron spectrum of Dy165-Ho165 (in German)

Journal Article · · Annalen der Physik (Leipzig)

For the Garching research reactor at Munich, a BETA spectrometer was built in order to measure the conversion electrons from (n, gamma ) processes. The preparation was near the reactor core. The electrons emerge through an evacuated tube in the reactor shield and are passed into the BETA spectrometer. This is a surface spectrometer which deflects the electrons about 90 deg through a partially homogeneous, partially inhomogeneous magnetic sector field with double focusing. With a preparation surface of 10 x 30 mm2, a space angle of 10-5 sterad/4 pi , a transmission of 3 x 10-6, and a luminosity of 3 x 10-5 cm2, a half-value width of 0.11% was obtained for the lines in the pulse fraction. Electrons between 35 kev and 10 Mev could be measured. The entire installation was first constructed outside the reactor in order to test and adjust it. The spectrometer was calibrated with a known conversion line of Cs135-Ba137 and Au198-Hg198. Then the conversion ratios of Cs135-Ba13 and Au198-Hg198 were determined. With the spectrometer constructed outside the reactor the conversion spectrum of Dy165-Ho165 was measured. Three lines with the following conversion ratios were found: gamma 1 at 92.00 plus or minus 0.15 kev, K: L1: L2: L3:M:N = (6.6 plus or minus 0.7):1.0:(0.103 plus or minus 0.006):. (0.048 plus or minus 0.004):(0.19 plus or minus 0.01):(0.059 plus or minus 0.005); gamma 2 at 27.8 plus or 00.2 kev, K:L =4.3 plus or minus 0.6; gamma 3 at 362.6 plus or minus 0.25 kev, K:L = 7.9 plus or minus 0.8.

Research Organization:
Technische Hochschule, Munich
Sponsoring Organization:
USDOE
NSA Number:
NSA-17-004812
OSTI ID:
4752356
Journal Information:
Annalen der Physik (Leipzig), Journal Name: Annalen der Physik (Leipzig) Journal Issue: 5-6 Vol. 464; ISSN 0003-3804
Country of Publication:
Country unknown/Code not available
Language:
German

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Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
BARIUM 137
BETA SPECTROMETERS
CESIUM 135
DYSPROSIUM 165
ELECTRONS
ENERGY
GAMMA RADIATION
GOLD 198
HOLMIUM 165
INTERNAL CONVERSION
MAGNETIC FIELDS
MEASURED VALUES
MERCURY 198
NEUTRONS
NUCLEAR REACTIONS
PULSES
REACTOR CORE
RESEARCH REACTORS
SHIELDING
SPECTRA