Inner Bremsstrahlung Emitted in Electron Capture Decay of Ni^{59}, A^{37}, and Fe^{55}
Abstract
The continuous gammaray spectra (inner bremsstrahlung) accompanying orbital electron capture in Ni^{59}, A^{37}, and Fe^{55} have been studied with the use of a scintillation spectrometer of NaI(Tl). The shape of the spectrum of Ni^{59} has been found to correspond to a second forbidden spectrum (∆I=2, No) and is distinctly different from that of an allowed one. The parameter, λ, of the correction factor, C_{2s,T}, is approximately 0.33; the value of A_{ij}T_{ij}, for a pure tensor interaction, is (6). The probability of emission of a photon of energy greater than 100 kev has been shown to be 1.4+/0.4 times the theoretical value. The spectrum of A^{37} has an allowed shape at energies as low as ~35 kev, and the ratio of emission probabilities P_{(exp)}P_{(theoret)} is 1.05+/0.25 for the region of energy lying above 35 kev. The spectrum of Fe^{55} has been compared with the calculations of Glauber and Martin. In this case, the value of P_{(exp)}P_{(theoret)} is 1.1+/0.3 at higher energies.
 Publication:

Physical Review
 Pub Date:
 April 1956
 DOI:
 10.1103/PhysRev.102.466
 Bibcode:
 1956PhRv..102..466S