Internal Bremsstrahlung spectra fromW185andP

Abstract

The internal bremsstrahlung spectra from the P decay of +W and 3 P were measured using a NaI(Tl) scintillation spectrometer with a standard geometrical arrangement. After~t &~g all the necessary corrections the experimental results are compared with the allowed theory of Knipp, Uhlenbeck, and Bloch (KUB theory) and also with the Coulomb corrected theories of Lewis, Ford, and ¹lsson. In the case of W it is found that from 78 to 200 keV the experimental distribution is in good agreement with the KUB theory, whereas beyond 200 keV and below 78 keV the experimental points are far above even the highest Coulomb corrected theoretical distribution of Nilsson. The internal bremsstrahlung from this isotope has not been previously investigated. In the case of P the experimental relative intensity spectrum is compared with the KUB theory and also with the Coulomb corrected theory of Lewis and Ford. Fairly good agreement is obtained from 30 to 200 keV with the KUB theory but in the energy region from 200 to 900 keV, the experimental results deviate positively from both the KUB and Lewis and Ford theories. The experimental excess over the Lewis and Ford theory is 15% on the average. RADIOACTIVITY~W, P; measured internal bremsstrahlung spectrum.

Studies on inner bremsstrahlung from a few beta-emitting isotopes

“…The experimental investigations on the IB emission from forbidden β transitions have shown marked deviations from theoretical predictions (Narasimhamurthy and Jnanananda 1967, Hakeem and Goodrich 1962, Persson 1965, 1964, Kreische et al 1968, Beatie and Byrne 1971, Narayana et al 1977, Prasad Babu et al 1976, Ricci 1958, Berenyi et al 1969. Common to all these studies is the fact that the later half of the IB intensity spectrum deviated positively from the theories.…”