Toward complete spectroscopy ofLu167

Abstract

Excited states in 167 Lu were populated in the 123 Sb( 48 Ca,4n) reaction at 203 MeV and decay γ-rays measured using the Gammasphere spectrometer array. Two triaxial strongly deformed bands were identified previously and interpreted as zero-and one-phonon wobbling excitations. As a result of more extensive band search, the level scheme has been considerably extended to include ten new rotational bands, and some 630 γ-ray transitions. A number of interband linking transitions were revealed, so that all but two bands could be connected with each other. Configurations are proposed for all new bands based on measured observables, with the help of Cranked Shell Model calculations. A γ-ray sequence, previously suggested as a triaxial strongly deformed band based on quasiparticle excitations coexisting with the wobbling excitation in the triaxial potential well, has now been determined to be a signature partner of a coupled band, associated with a normal deformed five-quasiparticle configuration. The possibility for two new bands being associated with triaxial deformation is discussed.

Slow interaction ramps in trapped many-particle systems: Universal deviations from adiabaticity

“…Adiabaticity is an essential and ubiquitous concept in quantum dynamics. In the current era of many novel nonequilibrium experimental possibilities, deviations from adiabaticity in slow parameter changes have attracted a lot of attention [1][2][3][4][5][6][7][8][9][10]. The question of non-adiabaticity is of fundamental interest, but also has practical implications.…”

“…Also, since cold atoms dominate experimental non-equilibrium studies, a harmonically trapped many-particle system is the most important paradigm today for studying quenches and ramps. A few studies of ramps in finite and trapped systems have appeared in the very recent literature [9,10], indicating an emerging recognition of the importance of the adiabaticity issue in finite systems. In addition, in the past couple of years, reports of experimental investigations of finite-rate interaction ramps have started to appear, both in the continuum [11] and in optical-lattices [12][13][14], with harmonically trapped atoms.…”

High-spin states and signature inversion in odd-odd Lu168

“…1). led to the identification of the wobbling excitation in 167 Lu [5], which formed part of a more complete spectroscopic study [20]. The current spectroscopy of 168 Lu is based on the same data set.…”

“…A systematic investigation of all the observed bands was carried out with respect to these observables, and compared with the single proton and neutron orbitals observed in the neighboring nuclei. The single proton orbitals observed are [404]7/2 + , [411]1/2 + , [402]5/2 + , [514]9/2 − , [541]1/2 − in 167 Lu [20] and 169 Lu [29]. The lowest single neutron orbitals observed are [642]5/2 + , [651]3/2 + , [523]5/2 − in 167 Yb [30] and 169 Hf [31].…”

“…The collective gyromagnetic ratio of the core (g R ) was taken to be Z/A = 0.42 in the calculation. The intrinsic quadrupole moment Q 0 = 6.8 eb was adopted from the UC calculation, with a 15% larger value used for Band 4 where the strongly deformation-driving π [541]1/2 − orbital is involved [20]. The intrinsic g-factors (g j ) used for different quasiparticle orbitals were taken from Refs.…”