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- Title
ISOMER SPECTROSCOPY OF NEUTRON-RICH <sup>165,167</sup>Tb.
- Authors
GURGI, L. A.; REGAN, P. H.; SÖDERSTRÖM, P.-A.; WATANABE, H.; WALKER, P. M.; PODOLYÁK, ZS.; NISHIMURA, S.; BERRY, T. A.; DOORNENBAL, P.; LORUSSO, G.; ISOBE, T.; BABA, H.; XU, Z. Y.; SAKURAI, H.; SUMIKAMA, T.; CATFORD, W. N.; BRUCE, A. M.; BROWNE, F.; LANE, G. J.; KONDEV, F. G.
- Abstract
We present information on the excited states in the prolate-deformed, neutron-rich nuclei 165;167Tb100;102. The nuclei of interest were synthesised following in-flight fission of a 345 MeV per nucleon 238U primary beam on a 2 mm 9Be target at the Radioactive Ion-Beam Factory (RIBF), RIKEN, Japan. The exotic nuclei were separated and identified event-by-event using the BigRIPS separator, with discrete energy gamma-ray decays from isomeric states with half-lives in the Vs regime measured using the EURICA gamma-ray spectrometer. Metastable-state decays are identified in 165Tb and 167Tb and interpreted as arising from hindered E1 decay from the 7-/2[523] single quasi-proton Nilsson configuration to rotational states built on the 3-/2[411] single quasi-proton ground state. These data correspond to the first spectroscopic information in the heaviest, odd-A terbium isotopes reported to date and provide information on proton Nilsson configurations which reside close to the Fermi surface as the 170Dy doubly-midshell nucleus is approached.
- Subjects
RADIOACTIVE nuclear beams; EXCITED states; ISOMERS; SPECTRUM analysis; TERBIUM isotopes; NEUTRON beams
- Publication
Acta Physica Polonica B, 2017, Vol 48, Issue 3, p601
- ISSN
0587-4254
- Publication type
Article
- DOI
10.5506/APhysPolB.48.601