FOUR-FOLD DATA ANALYSIS OF ~(252)Cf FISSION PRODUCTS

摘要

Prompt gamma-ray 4-fold data were built to collect 2× 10~(11) γ-γ-γ-γ quadruple- and higher-fold y -coincidence events from the spontaneous fission of ~(252)Cf with Gammasphere detector arrays. The nuclei ~(106)Nb, ~(115)Pd, ~(142)La,~(145,146)Ba, ~(152)Ce and Gd have been studied with these data. By using the new 4-fold data, we confirmed several weak tentative transitions in ~(106)Nb, ~(142)La, ~(145,146)Ba, ~(148)Ce which were observed previously from the y -y -y triple cube. Some new transitions in ~(106)Nb, ~(142)La were identified by our new 4-fold data. Cascades in ~(145,146)Ba are much clearer in four-fold data than the previous triple coincidence data. We will continue to study other nuclei by our 4-fold data with lower background than the previous triple cube.