Isomer spectroscopy of neutron-rich Tb-168(103)
- Authors
- Gurgi, L. A.; Regan, P. H.; Soderstrom, P. A.; Watanabe, H.; Walker, P. M.; Podolyak, Zs.; Nishimura, S.; Beriy, 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.; Odahara, A.; Wu, J.; Liu, H. L.; Xu, F. R.; Korkulu, Z.; Lee, P.; Liu, J. J.; Phong, V. H.; Yag, A.; Zhang, G. X.; Alharbi, T.; Carroll, R. J.; Chae, K. Y.; Dombradi, Zs.; Estrade, A.; Fukuda, N.; Griffin, C.; Ideguchi, E.; Inabe, N.; Kanaoka, H.; Kojouharov, I.; Kubo, T.; Kubono, S.; Kurz, N.; Kuti, I.; Lalkovski, S.; Lee, E. J.; Lee, C. S.; Lotay, G.; Moon, C. -B.; Nishizuka, I.; Nita, C. R.; Patel, Z.; Roberts, O. J.; Schaffner, H.; Shand, C. M.; Suzuki, H.; Takeda, H.; Terashima, S.; Vajta, Zs.; Yoshida, S.; Valiente-Dobon, J. J.
- Issue Date
- Nov-2017
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Structure of neutron-rich Terbium radioisotopes; Gamma-ray spectroscopy and nuclear isomerism; Possible two-quasiparticle configurations; Nuclear energy-level schemes
- Citation
- RADIATION PHYSICS AND CHEMISTRY, v.140, pp 493 - 496
- Pages
- 4
- Journal Title
- RADIATION PHYSICS AND CHEMISTRY
- Volume
- 140
- Start Page
- 493
- End Page
- 496
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/18973
- DOI
- 10.1016/j.radphyschem.2016.12.011
- ISSN
- 0969-806X
- Abstract
- In-flight fission of a 345 MeV per nucleon U-238 primary beam on a 2 mm thick Be-9 target has been used to produce and study the decays of a range of neutron-rich nuclei centred around the doubly mid-shell nucleus Dy-170 at the RIBF Facility, RIKEN, Japan. The produced secondary fragments of interest were identified event by-event using the BigRIPS separator. The fragments were implanted into the WAS3ABI position sensitive silicon active stopper which allowed pixelated correlations between implants and their subsequent beta-decay. Discrete gamma-ray transitions emitted following decays from either metastable states or excited states populated following beta decay were identified using the 84 coaxial high-purity germanium (HPGe) detectors of the EURICA spectrometer, which was complemented by 18 additional cerium-doped lanthanum bromide (LaBr3) fast-timing scintillation detectors from the FATIMA collaboration. This paper presents the internal decay of a metastable isomeric excited state in the odd-odd nucleus Tb-168, which corresponds to a single proton-neutron hole configuration in the valence maximum nucleus Dy-170. These data represent the first information on excited states in this nucleus, which is the most neutron-rich odd-odd isotope of terbium (Z=65) studied to date. Nilsson configurations associated with an axially symmetric, prolate-deformed nucleus are proposed for the Tb-168 ground state the observed isomeric state by comparison with Blocked BCS-Nilsson calculations.
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