Energy levels of Z = 11−21 nuclei (IV)

Energy levels of light nuclei. III Z = 11 to Z = 20

To test the relevance of the most common assumptions in the calculation of beta $(\ensuremath{\beta})$ and neutrino $(\ensuremath{\nu})$ spectra, a database of measured shape factors was created, containing 130 distinct transitions. Some analysis parameters were defined to characterize the quality of the calculated spectra. Results from this systematic comparison between theory and experiment are presented in detail. The ${\ensuremath{\lambda}}_{k}=1$ approximation for forbidden unique transitions is shown to be systematically worse than the correct calculation of the theoretical shape factors, where the energy dependence of the ${\ensuremath{\lambda}}_{k}$ parameters is included. Regarding forbidden nonunique transitions, the $\ensuremath{\xi}$ approximation is found to be valid for only about half of the first forbidden nonunique transitions and incorrect in all other cases. The criterion $2\ensuremath{\xi}/{E}_{0}\ensuremath{\gg}1$ is proved to be insufficient in itself if $2\ensuremath{\xi}/{E}_{0}l100$.

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Reliability of usual assumptions in the calculation of β and ν spectra

A Cascade-Evaporation Model for Photonuclear Reactions

https://deepblue.lib.umich.edu/bitstream/handle/2027.42/32900/0000279.pdf;sequence=1

Börje Persson

Papers

Internal bremsstrahlung from P32, Sr89, Y90, Y91 and Bi210

High-energy photon induced spallation reactions in 127I

Beta spectra from the decay of Pr143 and P32

Internal bremsstrahlung from P32

Differential internal bremsstrahlung spectra from Y90 and Y91