THE EFFECTIVE CROSS SECTIONS OF SOME NUCLEAR REACTIONS CAUSED BY 14-Mev NEUTRONS IN THE SCINTILLATION CRYSTALS NaI(Tl), KI(Tl), CsI(Tl), AND Li$sup 6$I(Eu) (in German)
Journal Article
·
· Z. Naturforsch
OSTI ID:4185711
In the study of reactions which are released in the detector crystals themselves, one has the advantage of the relative high detection probability. Therefore, one can both detect a radioactivity released in the crystal by collision with neutrons and also measure the energy distribution of particle reactions. By activation the following cross sections were determined- sigma / sub np/(I/sup 127/)= 25 plus or minus 15 mb; sigma /sub np/(Na/sup 23/) = 9 plus or minus 4 mb; sigma /sub na/(Na/sup 23/) = 29 plus or minus 9 mb; and sigma /sub na/(K/sup 41/) = 12 plus or minus 5 mb. If the processes caused by the tritium neutron are counted in coincidence with the alpha particles of the D(T, alpha )n reactions, then the absolute cross sections can also be measured, that is, the total cross sections of all reactions occurring in the crystal. The method for simultaneous determination of the pulse rise time permits also the distinction of pulses which are caused by alpha particles, protons, or electrons. Therefore, the following total cross sections were determined: sigma /sub np/(Cs/sup 133/ + I/sup 127/) =34 plus or minus 5 mb; sigma /sub n,np(Cs/ sup 133/ +I/s up 127/) = 8 plus or minus 1 mb; a/(K/sup 39/) = 110 plus or minus 16 mb; and e proton energy distributions the nuclear temperature for the (n,p) and (n,np) processes can be determined by use of the statistical theory. (tr-auth)
- Research Organization:
- I. Institut fur Experimentalphysik, Hamburg
- NSA Number:
- NSA-14-015333
- OSTI ID:
- 4185711
- Journal Information:
- Z. Naturforsch, Journal Name: Z. Naturforsch Vol. Vol: 15a
- Country of Publication:
- Country unknown/Code not available
- Language:
- German
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Related Subjects
ACTIVATION-- ALPHA PARTICLES-- CROSS SECTIONS-- ENERGY- - ENERGY RANGE-- EXCITATION-- FAST NEUTRONS-- MEASURED VALUES-- MEV RANGE-- MONOCRYSTALS-- NEUTRON BEAMS-- NUCLEAR MODELS-- NUCLEAR REACTIONS-- NUCLEAR TEMPERATURE-- NUCLEAR THEORY-- NUCLEI-- POTASSIUM IODIDES-- POTASSIUM 41-- SCINTILLATION COUNTERS-- SPECTRA-- STATISTICS-- TARGETS-- THALLIUM
ACTIVATION-- ALPHA PARTICLES-- CROSS SECTIONS-- ENERGY-- ENERGY RANGE-- EXCITATION-- FAST NEUTRONS-- MEASURED VALUES-- MEV RANGE-- MONOCRYSTALS-- NEUTRON BEAMS-- NUCLEAR MODELS-- NUCLEAR REACTIONS-- NUCLEAR TEMPERATURE-- NUCLEAR THEORY-- NUCLEI-- PROTONS-- SCINTILLATION COUNTERS-- SODIUM IODIDES--
PHYSICS
ACTIVATION-- ALPHA PARTICLES-- CROSS SECTIONS-- ENERGY-- ENERGY RANGE-- EXCITATION-- FAST NEUTRONS-- MEASURED VALUES-- MEV RANGE-- MONOCRYSTALS-- NEUTRON BEAMS-- NUCLEAR MODELS-- NUCLEAR REACTIONS-- NUCLEAR TEMPERATURE-- NUCLEAR THEORY-- NUCLEI-- PROTONS-- SCINTILLATION COUNTERS-- SODIUM IODIDES--
PHYSICS