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ON THE "INTERNAL BREMSSTRAHLUNG" ASSOCIATED WITH THE BETA DECAY OF $sub 81$Tl$sup 20$$sup 4$ (in Italian)

Journal Article · · Nuovo Cimento (Italy) Divided into Nuovo Cimento A and Nuovo Cimento B
OSTI ID:4315173
The experimental distribution of the internal bremsstrahlung in the case of Tl/sup 204/ BETA decay has been measured, with the help of a gamma scintillation spectrometer. The method used in calibrating the experimental apparatus and in evaluating the true experimental spectrum is reported. In the energy interval considered the experimental distribution has been compared with the theoretical spectra calculated on the basis of the method developed by Knipp and Uhlenbeck and of the Nilsson method, which take into account, in first approximation, the influence of the Coulomb field of the nucleus. The experimental results are in disagreement with the Knipp and Uhlenbeck distribution and agree well with the Nilsson corrected distribution up to a lower limit of about 150 kev, showing, in this case the importance of the nuclear Coulomb field. Nevertheless, for energies lower than 150 kev, also the corrected theoretical spectrum is unsatisfactory; the excess of photons in the lower part of the experimental spectrum is the outstanding feature of the T1/sup 204/ internal bremsstrahlung. This seems to be in agreement with the results of Starfelt and co-workers, and LangevinJoliot for other nuclides. Owing to the fact that the Nilsson theoretical distribution is calculated for allowed transition only, the influence of the BETA spectrum shape (unique first forbidden in the case of T1/sup 204/) cannot be excluded. Between 60 and 400 kev an intensity of (1.0 plus or minus 0.1) x 10/sup -3/ photons per disintegration has been found; the predicted intensities are 0.637 x 10/sup -3/ and 0.769 x 10/ sup -3/ photons per disintegration, for the Knipp and Uhlenbeck theory and for the Nilsson corrected theory, respectively. (auth)
Research Organization:
Istituto di Fisica Sperimentale del Politecnico, Turin
NSA Number:
NSA-12-012031
OSTI ID:
4315173
Journal Information:
Nuovo Cimento (Italy) Divided into Nuovo Cimento A and Nuovo Cimento B, Journal Name: Nuovo Cimento (Italy) Divided into Nuovo Cimento A and Nuovo Cimento B Vol. Vol: (10) 8; ISSN NUCIA
Country of Publication:
Country unknown/Code not available
Language:
Italian

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Related Subjects

BETA DECAY
BREMSSTRAHLUNG
ELECTRIC FIELDS
ENERGY
GAMMA SPECTROMETERS
MEASURED VALUES
NUCLEI
NUMERICALS
PHYSICS
QUANTUM MECHANICS
SCINTILLATION COUNTERS
SELECTION RULES
SPECTRA
STANDARDS
THALLIUM 204
TRANSIENTS