COLLECTIVE PROPERTIES OF THE ODD-MASS CS NUCLEI .1. CS-127,CS-129,CS-131,CS-133

The high-spin states in the odd-mass Cs127-133 have been investigated using the Sn120-124(B10,3n) Cs127-131, I127(,2n)Cs129 and Te126-130(Li6,3n)Cs129-133 reactions, to study the collective properties of these Cs isotopes. In-beam measurements of -ray excitations, - coincidences, -ray angular distributions, and pulsed-beam timing were performed with Ge(Li) detectors to establish the level schemes. Two collective features have been observed in these odd-mass Cs127-133 nuclei: J=2 bands built on the 112-(1h112 quasi-proton) states and on the 72+ (1g72 quasiproton) states. The systematics of these band structures in Cs127-133, as well as in Cs119-125, are presented and discussed in terms of the particle-plus-rotor and particle-plus-vibrator models. NUCLEAR REACTIONS Sn120-124(B10,3n)Cs127-131, T127(,2n)Cs129, Te126-130(Li6,3n)Cs129-133; measured - coincidences, (E,t); deduced level schemes in odd-mass Cs127-133, multipolarities, J. Enriched targets, Ge(Li) detectors. NUCLEAR STRUCTURE Odd-mass Cs127-133, calculated 112-J=2 rotational bands. © 1979 The American Physical Society.