Yrast isomers in tin nuclei from heavy ion collisions and the νh11/2subshell filling

New sub-μs isomers in125,127,129Snand isomer systematics ofLozeva1, Simpson2, Grawe3 et al. 2008Phys. Rev. C

“…A good description of the experimental data is found from using an effective neutron charge of e n = 0.70e, in agreement with previous work in this region [19,20], and at variance with the larger values found in Refs. [3,12,21]. The experimental method and results are introduced in Secs.…”

“…To date, intermediate-spin states have been observed, in the Sn isotopes at, or a few neutrons away from, stability by using deep-inelastic reactions [1][2][3][4]. Further away from stability, Sn nuclei and their vicinity have been studied by using relativistic fission [5][6][7] and fragmentation [8,9] reactions.…”

High-spin studies and nuclear structure in three semi-magic regions of the chart: High-seniority states in Sn isotopes

“…Therefore their study as a function of the neutron number gives us the opportunity to explore the main features of the ν(h 11/2 ) 4,5,6 configurations. However such a work is restricted to A ≥ 120 since the yrast states of the lightest-A Sn isotopes are dominated by a collective band coming from 2p-2h excitations across the Z = 50 gap, which hampers identifying states coming from the ν(h 11/2 ) n configurations.…”

“…Because of the lack of suitable stable projectile-target combinations, high-spin states of heavy Sn isotopes cannot be populated by fusion-evaporation reactions. Thus up to now, the medium spin states of the 120-126 Sn isotopes were only measured up to the spin I = 10 + for the even mass and I = 27/2 − for the odd mass, by using reactions induced by light ions, deep inelastic reactions, isomeric decays of long-lived states of Sn produced by fission of actinides, or -decays of the high-spin long-lived states of heavy indium nuclei [2][3][4][5][6][7][8]. The decay of a new isomeric state in 128 Sn populated in the fragmentation of 136 Xe has been recently reported [9] which has been proposed to be the 15 − state expected from the (νh 11/2 ) −3 (νd 3/2 ) −1 configuration.…”

High-spin states populated in deep-inelastic reactions

“…Excited states in the vicinity of both the 82 Se beam and the 192 Os target nuclei have been populated using heavyion multi-nucleon transfer reactions and studied through γ-ray spectroscopy in a " thick target" [4] measurement. The combination of the Tandem-XTU and the superconducting LINAC ALPI accelerators at the Laboratori Nazionali di Legnaro, Italy, was used to accelerate a beam of 82 Se ions to an energy of 460 MeV.…”