### BETA-GAMMA DIRECTIONAL CORRELATION IN Rb$sup 86$ AND Eu$sup 15$sup 2$BETA-GAMMA DIRECTIONAL CORRELATION IN Rb$sup 86$AND Eu$sup 15$sup 2$

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 Author Fischbeck, H. J. ♦ Wilkinson, R. G. Source United States Department of Energy Office of Scientific and Technical Information Content type Text Language English
 Subject Keyword PHYSICS ♦ ANGULAR DISTRIBUTION ♦ BETA DECAY ♦ BETA PARTICLES ♦ BETA SPECTROMETERS ♦ ENERGY ♦ EUROPIUM ♦ GAMMA RADIATION ♦ MAGNETISM ♦ MEASURED VALUES ♦ RUBIDIUM ♦ SPECTRA Abstract Measurements are reported on the energy dependence of the BETA - gamma angular correlation coefficient in the special first forbidden cases of Rb/sup 86/ and Eu/sup 152/. Energy selection of the BETA rays was accomplished with a magnetic BETA -ray spectrometer having good transmission. It is shown that Rb/ sup 86/ cannot be analyzed in terms of the so-called modified B/sub ij/. approximation. The Eu/sup 152/ decay, on the other hand, can be treated quite satisfactorily in this approximation. It was concluded in this case that a strong selection-rule effect is operative to suppress certain of the matrix elements relative to B/sub ij/. The nuclear parameter Y (Kotani's notation) was found to be 0.69 plus or minus 0.06. This agrees well with the value which results from the measured spectrum shape factor. (auth) ISSN 0031899X Educational Use Research Learning Resource Type Article Publisher Date 1960-12-01 Publisher Department Indiana Univ., Bloomington Journal Physical Review Volume Number 120 Organization Indiana Univ., Bloomington