Search for possible one- and two-phonon octupole vibrational states in 134Sb, 134, 135Te, 135, 136I, 137Xe and 139Ba near 132Sn

Abstract

High spin states of 134Sb, 134, 135Te, 135, 136I, 137Xe and 139Ba near 132Sn are reanalysed in order to search for octupole phonon vibrational states. New spins and parities are tentatively assigned to the 2203.9 keV state in 137Xe and the 1976.6 and 2091.7 keV states in 139Ba from the state energy plots of the N = 82 and 83 nuclei. High spin states of 134Sb, 134, 135Te, 135, 136I, 137Xe and 139Ba connected by E1, E3/M2 and E3 transitions are proposed, for the first time, as zero-, one- and two-phonon octupole vibrational (POV) states. One- and two-POV states in 134Sb and 135Te are built on a 7− (πg7/2νf7/2) state and a 19/2− (νf7/2 ⊗ 6) state, respectively. One-POV states built on the 19/2− (νf7/2 ⊗ 6) and the 21/2− (νh9/2 ⊗ 6) states coexist in 137Xe. Then, one- and two-POV states in 139Ba are built only on the 21/2− (νh9/2 ⊗ 6) state. One- and two-POV states in 134Te are built on the 6 state with some mixing with the 6 state.