High-spin structures inPd108: γ-vibrational band and two-quasineutron excitations

Abstract

The high-spin structures of the 108 Pd nucleus have been studied with the 100 Mo( 11 B, p2nγ ) reaction at 43 MeV incident energy. γ -γ -t, γ -γ -charged-particle coincidences and directional correlation ratios were measured using the SACI-PERERE γ spectrometer formed by four Compton suppressed HPGe detectors and a 4π charged-particle ancillary detector system. Recent results for the γ -vibrational band and the νh 11/2 ⊗ ν(g 7/2 , d 5/2 ) negative parity structures have been confirmed and complemented. A new band tentatively based on the second lowest (νh 11/2 ) excitation has been observed.

Microscopic nuclear structure models and methods: chiral symmetry, wobbling motion andγ–bands

“…These twoquasiparticle bands become favoured at some spin, depending on the region, are referred to as the sbands. For a class of nuclei in A = 130 region, both protons and neutrons occupy same aligning (high-j) configuration with the result that both two-neutron and two-proton states cross the ground-state almost simultaneously thus resulting into the forking of the ground-state band [73,74]. It is, therefore, expected that one s-band should have positive g-factor corresponding to the proton configuration and the other s-band must have negative g-factor as it belongs to the neutron configuration.…”

rotational bands in neutron-rich Mo, Ru, and Pd nuclei *

“…The neutron-rich nuclei have abundant properties regarding their structure, e.g., shape transitions [9][10][11][12][13],vibration [14][15][16][17], and triaxial shape [4,6,18,19]. In this region, several high-orbitals can be found around the proton and neutron Fermi surfaces, e.g., , and .…”