Shell-model influence in the rotational nucleusMo86

Isomeric states in neutron-deficientA~80–90nuclei populated in the fragmentation ofAg107Garnsworthy1, Regan2, Piétri3 et al. 2009Phys. Rev. CSelf Cite32161View full textAdd to dashboardCite

“…The data are gated between 150 ns and 5 µs after the time the associated ion arrived in the stopper. [48]. On this basis, they are assigned to be the first two transitions of the T = 1 ground-state band in 86 Tc.…”

Low-spin collective behavior in the transitional nucleiMo86,88

“…The degree of collectivity changes dramatically with changing nucleon numbers in this mass region of the nuclear chart. For example, the low-lying yrast states of eveneven neutron deficient molybdenum isotopes with N < 46 have been described within the collective rotational model, as in the case of 86 Mo [2], whereas the more neutron-rich isotopes 90,92 Mo in the vicinity of the N = 50 shell closure can be described by spherical shell-model calculations [3]. A systematic study by Gross et al [4] of the neutron-deficient molybdenum isotopes indicates that 88 Mo is best described as a transitional nucleus with a combination of collective and single-particle excitations.…”

Shape change induced by g 9/2 rotational alignment in 84,86Mo

“…Calculated kinematic moments of inertia J (1) ≈ 11 2 /MeV at low rotational frequency ω = 0. the same rotational frequency ( ω ≈ 0.5 MeV), with a total alignment of about 10 (see ref. [10]). In our calculation, the up-bending corresponds to the alignment of one pair g 9/2 proton and one pair g 9/2 neutron at ω ≈ 0.45 MeV.…”

“…For more collective Z, N 44 nuclei, the evolution in collectivity, strong shape-driving effect from g 9/2 orbit and residual proton-neutron interaction act together, resulting in various interesting phenomena in this mass region, such as superdeformation in 84 Zr [1], γ-vibrations in 80,82 Sr [5,6] and delayed alignment in 84 Mo and 80 Zr [7,8]. Experimentally, with the development of γ-ray detectors, the measurement of high spin states in 84,86 Mo [7,9,10] makes it possible to test detailed theoretical calculations concerning their deformations.…”

“…The observed up-bending starting from I = 6 has been recognized as the alignment of two pairs of g 9/2 particles at almost Angular momentum I x and kinematic moments of inertia J(1) versus rotational frequency ω for 84,86 Mo. The filled circles refer to the experimental data taken from ref [10]. and the empty circles refer to the calculated results with a triaxial-oblate shape.…”