Collective band structures in the Tc-99 nucleus
2015 (English)In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 91, no 5, 054314Article in journal (Refereed) Published
Excited states in Tc-99 with energies up to 6 MeV have been populated using the Zr-96(Li-7, 4n)Tc-99 reaction with a laboratory beam energy of 35 MeV. Coincident gamma rays from excited nuclei produced in the reactions were detected using an array of coaxial, planar, and clover-type high-purity germanium detectors. A total of 60 new gamma-ray transitions and 21 new levels are identified and placed into a new level scheme. Two collective bands assigned to be built on the pi g(9/2)5/2(+) and pi p(1/2)1/2(-) Nilsson configurations have been extended with spins up to 35/2 and 33/2 h, respectively. Backbending and signature inversion have been observed in the yrast band. The large signature splitting of the positive-parity band in Tc-99 may be caused by a triaxial deformation, which agrees well with the electromagnetic properties, theoretical calculations based on total Routhian surface, and triaxial particle-rotor model calculations.
Place, publisher, year, edition, pages
2015. Vol. 91, no 5, 054314
IdentifiersURN: urn:nbn:se:kth:diva-168692DOI: 10.1103/PhysRevC.91.054314ISI: 000354558000001ScopusID: 2-s2.0-84929359307OAI: oai:DiVA.org:kth-168692DiVA: diva2:817999
FunderSwedish Research Council
QC 201506082015-06-082015-06-082015-07-10Bibliographically approved