13 research outputs found
High spin states of At: search for isomeric states and evaluation of shears band structure
High spin states of neutron deficient Trans-Lead nucleus At were
populated up to through the C + Au
fusion evaporation reaction. Decay of the high spin states including prompt and
delayed gamma ray emission were studied to understand the underlying nuclear
structure. The level scheme, which was partly known from earlier studies, was
extended further through our experiment and analysis of spin and parity of the
associated levels. An isomeric level ,
corresponding to transition, was established from our measurements.
Attempts were made at interpretation of the excited states based on multi
quasiparticle and hole structure involving , , and
shell model states, along with moderate core excitation. Magnetic
dipole band structure over the spin parity range:~, which was
found in the earlier Gammasphere study, was confirmed and explored in more
detail, including the missing cross-over transitions. Band-crossing along
the shears band was observed and compared with the evidence of similar
phenomena in the neighboring neutron deficient Bi, Rn isotones
and the neighbouring At isotope. Based on comparison of the measured
values for transitions along the band with the semiclassical
model based estimates, the shears band of At was firmly established
along with the level scheme