Isomeric transitions between shape coexisting states in iodine isotopes withA=115, 119 and 121

Abstract

Abstract. Applying delayed V-r.f. coincidences and generalized centroid-shift analysis, nanosecond isomers in some odd-A iodine isotopes are studied in-beam. The reactions 1~p2n) and 116'1188n(6Li, 3n) have been 123'125I [10] where the lifetimes of the 11/2~-and 9/2 + band heads were determined. One aim of the present work was to extend the systematics with experimental data for lowlying noncollective states in 115,119,1211.The coexistence of excited states with different shapes which has been observed in the odd-A iodine isotopes gives the opportunity to investigate the strength of the electromagnetic transitions between them. In this way, the expected hindrance can be experimentally studied. This was a further aim of this paper.