Band structures in Pd101

Abstract

Excited states in the 101 Pd nucleus were investigated through the 75 As( 31 P, 2p3n) fusion-evaporation reaction at E lab = 125 MeV using the Indian National Gamma Array (INGA) spectrometer equipped with 21 clover Ge detectors. The level scheme is considerably extended for medium spin values. New positive-parity band structures in 101 Pd have been studied within the framework of the projected shell model (PSM) and are found to undergo transition from single quasiparticle to high-K three quasiparticle configuration after bandcrossing, i.e., from principal-axis rotation to tilted-axis rotation. The negative-parity band structures are discussed in the framework of the hybrid version of tilted-axis cranking (TAC) shell model calculations. The observed alignment gain in the lowest excited νh 11/2 negative-parity band results from successive (νg 7/2 ) 2 and (πg 9/2 ) 2 pair alignments. The higher excited negative-parity bands are reproduced for the ν[h 11/2 (g 7/2 /d 5/2 ) 2 ] and (πg 9/2 ) −2 ⊗ νh 11/2 configurations.

Collisionless dynamics in two-dimensional bosonic gases

“…In two-dimensional (2D) uniform systems the Mermin-Wagner-Hohenberg theorem [11,12] precludes Bose-Einstein condensation at finite temperature, but quasicondensation and superfluidity is possible below the Berezinskii-Kosterlitz-Thouless critical temperature T c [13,14]. Very recently the speed of sound in a uniform quasi-2D Bose gas made of 87 Rb atoms has been measured [15,16]. These experimental results are in agreement with theoretical predictions [17] based on the two fluids hydrodynamics of Landau-Khalatnikov only well below T c .…”

“…The authors of [15,16] explain the discrepancy above T c by suggesting that the experimental conditions are such that in this case collisions are not efficient enough to ensure the local thermodynamic equilibrium required by hydrodynamics and therefore the dynamics is collisionless.…”

Universal Uhrig Dynamical Decoupling for Bosonic Systems

“…A similar analysis applies to (m + 1)-qubit DD schemes with multi-qubit Pauli pulses, see [13]: Identically defined functions (16) appear in the toggling frame generator and give rise to the same coefficients (18) in the Dyson series of the toggling frame evolution. As a consequence, any qubit decoupling scheme based on Pauli pulses provides the necessary cancellations when translated to the bosonic homogenization setting using the substitution rule (11).…”

“…This scaling is significantly more efficient than what could be achieved, e.g., by concatenating [14] earlier (first order) schemes [15] based on pulses from a unitary 1-design applied at equidistant times. NUDD has been experimentally demonstrated [16] for three nesting levels.…”

“…, L} → (Z 2 2 ) m+1 that are applied to the system at times t j . Then the functions F qubit α defined by (16)…”