Tc-105 nuclear structure and systematic evolution of states of 1/2(+)[431] intruder band in odd-A Tc-95(,)97(,)99(,)101(,)10(3,)105(,)107 isotopes

摘要

Previously observed negative and positive parity states of Tc-105 were studied in the framework of the particle-rotor model. Transition properties and experimental energies were compared to the predictions of model calculations. A systematic study of the evolution of the intruder pi 1/2(+)[413] band in the nuclear structure of odd-A technetium isotopes Tc-95(,)97(,)99(,)101(,)10(3,)105(,)107 is presented as well. The existence of this intruder band has been argued previously in (TC)-T-95,97,99,101,103 isotopes (partially populated) and fully observed and confirmed in Tc-105. It will be shown that changes in deformation and subsequently the position of the Fermi level, vis a vis the 1/2(+)[431] intruder orbital originating firom the pi(d(5/2), g(7/2)) subshells, predominantly affect these systematic changes. All four interpreted experimental rotational bands are naturally predicted by the rotational model as bands build on states of good Omega originating from the 5/2(+)[422], 5/2(-)[303], 3/2(-)[301], and 1/2(+)[431] orbitals near the Fermi level in deformed Tc-105 (strong coupling). Further experimental investigation about missing data are needed for those observed in low lying states in both Tc-105 and Tc-103 to confirm the presence of the 1/2(-)[301] rotational band that is well defined in lighter (TC)-T-95-T-,-T-97,99,101 isotopes.