Back-bending in the π band and proton-neutron interactions in 171Re

Multiple band structures in169,170Re: Search for the wobbling mode in169Re, and residual-interaction analysis of structures inHartley1, Janssens2, Riedinger3 et al. 2013Phys. Rev. C12050View full textAdd to dashboardCite

“…This assignment suggests that the crossing is from the AB alignment, which is significantly delayed with respect to that seen in band 1. A large delay in the AB crossing is also consistent with the [660]1/2 configuration as this trait has been observed in several nearby nuclei [7,31]. Similar to the [541]1/2 band, the delay is likely the result from a larger deformation associated with this sequence.…”

Collective excitations in the transitional nucleiRe163andRe165

“…The low-spin excited states in 163 Re and 165 Re are found to have a structure similar to that of the yrast bands in the heavier Re isotopes [11,[35][36][37][38], which are based on an odd proton occupying the h 11/2 [514]9/2 − Nilsson orbital. Figure 8 shows the evolution of the 9/2 − , 13/2 − , and 17/2 [35,36], and 167 Re [5] is 160, 157, 136, and 92 keV, respectively (see Fig.…”

“…Assuming that this trend extrapolates to 163 Re and that the α-decaying state has spin-parity of 9/2 − , the transition energy between the 11/2 − and the 9/2 − states would be very low − bands in the neutron-deficient odd-A rhenium isotopes 163 Re (band 1), 165 Re, 167 Re [11], 169 Re [35,36], and 171 Re [37,38]. Filled (open) symbols represent the α = −1/2 (α = +1/2) signatures, respectively.…”

“…The single-quasiproton configuration in the heavier isotopes 167−171 Re is crossed by the three-quasiparticle πh 11/2 ⊗ (νi 13/2 ) 2 configuration [11,[35][36][37][38]. Above this crossing there is a dramatic reduction in signature splitting.…”

Intruder bands extended inRe175andIrØdegård1, Bengtsson2, Bearden3 et al. 1995Phys. Rev. CSelf Cite11010View full textAdd to dashboardCite

“…In the proton i/3/2 bands of the Re and Ir regions, the normal sign of such a crossing, a backbend on a plot of aligned angular momentum vs frequency, is usually absent [5].The i t3/2 bands generally up-bend gradually, in a way such that the location of the crossing is unclear. This has lead to much speculation about the reason for the up-bend; that the crossing is hidden by a strong interaction, as large as 470 keV, between the oneand three-quasiparticle bands [6,7]; that the deformation increases with increasing rotational frequency [8]; or that the deformations of these bands are larger [9]. Indeed, in line with a recent measurement of transition quadrupole moments [10], estimates [9,11] of the deformation associated with the i(3/2 bands based on the moment of inertias implied an increase of between 15 -30 % compared to that of the h9/2 bands.…”