Internal ionization during alpha decay: A new theoretical approach

Spectroscopy ofαandK- andL-Electron Continua andL-Electron Pickup inFischbeck1, Freedman2 1975Phys. Rev. Lett.

“…A best fit through the K points below 20 keV supports the conclusion that K and L ejection shapes are quite similar in this range. This similarity in the region including the bulk of the intensity is predicted in general binary-encounter theory 11 below the energy T m =4mE 1 /M 9 the maximum energy transferable in a collision between an impinging particle, mass M, energy E 19 and a free electron. However, for 210 Po a's, T m = 2.9keV, and above T m9 BEA calculations show a rapid 174 divergence of the spectra of individual shells toward an asymptotic dependence 9,11 proportional to (2?…”

“…Thus for the L spectrum the a and electron spectra supplement each other in determining low-(< 6 keV) and highenergy regions of the shape, respectively. To provide the convenience of an analytic form for the low end of the spectrum, we note that the extrapolation form thus selected happens to match the BEAif-shell (high-energy) asymptotic dependence, proportional to (B K +E L )" 9 . A similar extrapolation is used for the K shape to integrate it.…”

Ionization by Nuclear Transitions

“…The probability is obtained from the intensity of the shell x-rays, corrected for fluorescence yield, measured either in singles or in coincidence with alphas or with ejected electrons. For the inner shells the probabilities are given in Table 1, averaged A recent calculation by Hansen [5], has achieved fairly good agreement with the data in all three inner shells. This theory is an adaptation of the binary encounter approximation used in the evalaution of electron ejection in ionic bombardment; ionization occurs when the coulomb interaction transfers at least the electron binding energy from the incident ion to a single electron.…”

Cooperative laser–electron–nuclear processes: QED calculation of a spectrum of electron–nuclear γ‐transitions of a nucleus in the neutral atom

“…Refs. 3–15 have been developed to evaluate the excitation or ionization of an atom; the electronic redistribution of an ion or an atom induced a sudden recoil of its nucleus occurring when a neutral particle is either emitted (γ‐radioactivity) or captured (e.g., neutron capture) 5, 15–17. The most consistent approach to the problems considered must be based on quantum electrodynamics (QED).…”