Author/Authors :
Bizzeti، نويسنده , , P.G. and Bizzeti-Sona، نويسنده , , A.M. and Bini، نويسنده , , M. and Lunardi، نويسنده , , S. and Bazzacco، نويسنده , , D. F. De Angelis، نويسنده , , G. and Farnea، نويسنده , , E. and Menegazzo، نويسنده , , R. Di Napoli، نويسنده , , D.R. and Petrache، نويسنده , , C.M. and Podolyلk، نويسنده , , Zs. and Alvarez، نويسنده , , C.Rossi، نويسنده ,
Abstract :
High-efficiency arrays for γ spectroscopy, now available in several Laboratories, make possible the measurement of very weak cross-over transitions of high potential interest. A limit to the measurement possibilities comes, however, from the simultaneous detection of two γ-rays of a stop-over cascade (or “sum-up”), which cannot be distinguished from the true detection of the cross-over transition. We propose a new method to measure (and correct for) the sum-up effect, which can be used with symmetric γ detector arrays (like GASP and GAMMASPHERE), and discuss the possible techniques for identifying and estimating quantitatively the contribution of random pile-up, which can be sizeable at high counting rate. These ideas have been experimented at GASP in a dedicated measurement with a radioactive source of 52Mn. The results of this measurement are presented and discussed. Moreover, as a significant example, the method is applied to deduce the intensity of the E3 cross-over transition from the lowest 3− state of 148Gd.
