End point of the RaE beta spectrum

Determination of?-particle longitudinal polarization in the decay of210Bi

“…For 21~ the end point 0340-2193/80/0298/0301/$01.00 energy is W0=3.272_+0.003 [6]. The theoretical predictions for the coefficients k, a, b, c and d in the 4-approximation [12] are given by Deutsch and Lipnik [11].…”

“…This particular fi-transition has been subjected to an exceptional degree of experimental and theoretical study because of its distorted spectrum shape and anomalously low electron longitudinal polarization [1][2][3][4][5][6]. The present measurements were carried out as part of a testing programme for a new electron spin polarimeter but, in view of their relevance to the CVC hypothesis for nuclei, it seemed worthwhile to make them the subject of a brief publication.…”