High-spin states with seniorityv=4, 5, and 6 in119–126Sn

Abstract

The 119-126 Sn nuclei have been produced as fission fragments in two reactions induced by heavy ions: 12 C + 238 U at a bombarding energy of 90 MeV and 18 O + 208 Pb at 85 MeV. Their level schemes have been built from γ rays detected using the Euroball array. High-spin states located above the long-lived isomeric states of the evenand odd-A 120-126 Sn nuclei have been identified. Moreover, isomeric states lying around 4.5 MeV have been established in 120,122,124,126 Sn from the delayed coincidences between the fission fragment detector SAPhIR and the Euroball array. The states located above 3 MeV excitation energy are ascribed to several broken pairs of neutrons occupying the νh 11/2 orbit. The maximum value of angular momentum available in such a high-j shell, i.e., for midoccupation and the breaking of the three neutron pairs, has been identified. This process is observed for the first time in spherical nuclei.

Monopole-optimized effective interaction for tin isotopes

“…The largest difference is seen in the 3/2 + 1 state in 115 Sn mentioned above, where the experimental data are underestimated by [17,18,76]. In Fig.…”

“…6. (Color online) Experimental[17,18,67,76] (open symbols) and calculated (solid symbols with dotted lines) excitation energies of the low-lying even spin states in nuclei 102−130 Sn.…”

Promptγ-ray spectroscopy of the neutron-rich124Cd

“…As much of the medium-to-high spin data on nuclei in the neutron-rich mass 80 − 160 regions comes from prompt -ray spectroscopy measurements of spontaneous fission sources then the studies of the symmetric fission region are incomplete. Previous light-ion induced fission reactions have studied the Cd, In and Sn nuclei [6][7][8] though the target-projectile combination chosen did not give a product distribution as neutron-rich as the one reported in the present work.…”

E2 Transition Probabilities for Decays of Isomers Observed in Neutron-rich Odd Sn Isotopes

“…The investigation of levels located above these known 10 + and 27/2 − isomeric states became recently the subject of independent studies by several groups. Recently published papers [5,6] presenting the identification of high-spin state structures in neutron-rich Sn isotopes were soon followed by a more detailed study of even-Sn isotopes [7] which not only confirmed most of the findings, but also significantly expanded the experimental information and often made it more accurate. In particular, the regular appearance of 15 − isomeric states was confirmed, in several instances their decays were clarified and half-life values corrected.…”