High spin states of 132Cs

Planar and aplanar tilted bands in the odd–odd nucleus132Cs

“…Bands 4 and 6 are built on 7 − and 8 − states, respectively. The present study confirms the level structure for these bands proposed by Hayakawa et al [22] and provides detailed spectroscopic information about the multipolarities of the γ -ray transitions (see table 1). We were not able to observe the tentatively proposed 1076 keV transition at the top of band 4.…”

“…Both transitions have positive linear polarization values and angular correlation ratios consistent with I = 1 transitions (see table 1). These results strongly suggest a change in parity and confirm the tentatively proposed spin-parities 8 − and 9 − [22] for the 538 keV and 788 keV states, respectively. The 226 keV transition which links the 538 keV state with the 312 keV state has a linear polarization value and an angular correlation ratio consistent with a M1/E2 transition.…”

“…The experimental results for positive parity structures in 132 Cs from the present study have been reported recently [15]. Here, we would like to stress that we have considerably extended the previously proposed bands 1 and 2 [22]. Additionally, we have observed a new band-band 3.…”

“…We have not observed any transition below the 312 keV state which suggests that this state is isomeric. Such an isomeric state can be expected since Hayakawa et al [22] have proposed that the 312 keV state decays by a 72 keV E2 transition which should be strongly hindered. Bands 4 and 6 are built on 7 − and 8 − states, respectively.…”

“…The level scheme of 132 Cs deduced from the present experiment is shown in figure 2. In the first in-beam study of 132 Cs, Hayakawa et al [22] identified five structures and three of them, built on the lowest (7 − ), (8 − ) and the (9 + ) states were associated with two quasiparticle excitations involving the πh 11/2 orbital coupled to νd 5/2 , νg 7/2 and νh 11/2 orbitals, respectively. Liu et al [23] later suggested from smooth systematic trends of energy levels in Cs nuclei that the πh 11/2 ⊗ νh 11/2 band is built on the 1131 keV I π = 9 + state.…”