High-spin structure of104Pd

Abstract

The high-spin structure of the nucleus 104 Pd was studied through the 96 Zr( 13 C,5n) reaction at incident energies of 51 and 58 MeV, using the Euroball IV γ -ray spectrometer in conjunction with the DIAMANT charged-particle array. Several new medium-and high-spin bands were revealed. The already known positive-parity yrast and the negative-parity cascades were extended up to E x ∼ 13, ∼ 11, and ∼ 9 MeV with I π = (26 + ), I π = (23 − ), and (20 − ), respectively. The deduced band structures were compared with Woods-Saxon total Routhian surface (TRS) calculations. In addition, non-yrast low-lying positive-parity bands were identified, which were assigned to soft γ -vibrational excitations.

Lifetime measurements in 104Pd

“…the band structures in these nuclei can be found in references [1][2][3][4][5][6][7], where, interesting observations like, magnetic and antimagnetic rotations, γ-vibration, band termination, wobbling excitation, chiral partner bands, tidal motion on the surface of a nucleus have attracted a lot of attention. The possible reasons behind the rich variety of band structures in these nuclei are the presence of moderate quadrupole deformation (β 2 ) and softness with respect to the triaxial deformations (γ), as predicted in the total Routhian surface (TRS) calculations [8][9][10]. At lower excitation, the competing vibrational and rotational structures were observed in these nuclei [10][11][12][13], but, quasi-particles from the ν(d 5/2 , g 7/2 , h 11/2 ) and the πg 9/2 orbitals with different deformations (β 2 and γ) start aligning with increasing angular momentum [8][9][10].…”

“…The possible reasons behind the rich variety of band structures in these nuclei are the presence of moderate quadrupole deformation (β 2 ) and softness with respect to the triaxial deformations (γ), as predicted in the total Routhian surface (TRS) calculations [8][9][10]. At lower excitation, the competing vibrational and rotational structures were observed in these nuclei [10][11][12][13], but, quasi-particles from the ν(d 5/2 , g 7/2 , h 11/2 ) and the πg 9/2 orbitals with different deformations (β 2 and γ) start aligning with increasing angular momentum [8][9][10]. Alignment of these highj valance nucleons causes an evolution of shapes and hence, leads to a variety of band structures in these nuclei.…”

γ-ray linear polarization measurements and(g9/2)−3neutron alignment inZheng1, France2, Clément3 et al. 2013Phys. Rev. CSelf Cite18090View full textAdd to dashboardCite

“…transitions, where R DCO for non-stretched dipole transition with δ ≈ 0 mixing ratio is approximately the same as for a stretched quadrupole transition [18,19]. These ambiguities can be resolved by simultaneously measuring the linear polarization of the γ-ray transitions (see below).…”

“…These ambiguities can be resolved by simultaneously measuring the linear polarization of the γ-ray transitions (see below). For example, stretched E1, E2 or unstretched M 1 transitions and stretched M 1 or unstretched E1 transitions have opposite sign linear polarization values [19].…”

“…It should be noted that for mixed M 1 + E2 transitions R DCO ratios can vary between 0.6 and 1.0 depending on the δ multipole mixing ratio of the γ-ray. A further ambiguity arises for non-stretched (∆I = 0) pure E1 (or M 1) transitions, where R DCO for non-stretched dipole transition with δ ≈ 0 mixing ratio is approximately the same as for a stretched quadrupole transition [18,19]. These ambiguities can be resolved by simultaneously measuring the linear polarization of the γ-ray transitions (see below).…”