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

Applying delayed?- r.f. coincidences and generalized centroid-shift analysis, nanosecond isomers in some odd-A iodine isotopes are studied in-beam. The reactions¹⁰⁶Cd(¹²C,p2n) and^116,118Sn(⁶Li,3n) have been used. The following half-lives were determined:T_1/2(565 keV)=0.50±0.10 ns andT_1/2(837 keV) =0.90±0.20 ns in¹¹⁵I,T_1/2(687 keV)=5.50±0.50 ns andT_1/2(2418 keV)=4.0±0.50 ns in¹¹⁹I as well asT_1/2(812 keV)=0.35±0.20 ns andT_1/2(445 keV)<0.10 ns in¹²¹I. A systematics of the absolute probabilities for the transitions deexciting thepg_9/2 9/2⁺ andp_11/2 11/2₁^- band heads in^115–125I is presented and discussed.