A deviation in internal pair conversion

F.W.N. de Boer, O. Fröhlich, K.E. Stiebing, K. Bethge, H. Bokemeyer, A. Balanda, A. Buda, R. van Dantzig, Th.W. Elze, H. Folger, J. van Klinken, K.A. Müller (+3 others)
1996 Physics Letters B  
The El e+e-decay of the 17.2 MeV level in '*C, and the Ml e'e-decay of the 17.6 MeV level in *Be have been studied in a search for possible signals of short-lived neutral bosons with masses between 5 and 15 MeV/c*. Whereas for the El decay at large correlation angles no deviation is found from internal pair conversion (IPC), surprisingly the Ml angular correlation deviates from IPC at the 4.k level.
doi:10.1016/s0370-2693(96)01311-1 fatcat:i3qgmfotwzgyjb52sbjre2qw44