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Discovery of Highly Excited Long-Lived Isomers in Neutron-Rich Hafnium and Tantalum Isotopes through Direct Mass Measurements

Reed, M.W.; Cullen, I J; Walker, Philip M; Litvinov, Yu.A.; Blaum, K.; Bosch, F.; Brandau, C.; Carroll, J.; Cullen, D M; Deo, A.Y.; Detwiller, B.; Dimopoulou, C.; Dracoulis, George; Farinon, F.; Geissel, H.; Haettner, E.; Heil, M.; Kempley, R.S.; Knobel, R.; Kozhuharov, C.; Kurcewicz, J.; Kuzminchuk, N.; Litvinov, S.; Liu, Z.; Mao, Rui-Shi; Nociforo, C.; Nolden, F.; Plass, W.R.; Prochazka, A.; Scheidenberger, C.; Steck, M.; Stohlker, Th.; Sun, B.; Swan, T.P.D.; Trees, G.; Weick, H.; Winckler, N.; Winkler, M.; Woods, P.J.; Yamaguchi, T.


A study of cooled Au197 projectile-fragmentation products has been performed with a storage ring. This has enabled metastable nuclear excitations with energies up to 3 MeV, and half-lives extending to minutes or longer, to be identified in the neutron-rich nuclides Hf183,184,186 and Ta186,187. The results support the prediction of a strongly favored isomer region near neutron number 116.

CollectionsANU Research Publications
Date published: 2010
Type: Journal article
Source: Physical Review Letters
DOI: 10.1103/PhysRevLett.105.172501


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