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

Reed, M. W.<sup>*</sup>; Cullen, I. J.; Walker, P. M.; Litvinov, Yu. A.; Blaum, K.; Bosch, F.; Brandau, C.; Carroll, J. J.; Cullen, D. M.; Deo, A. Y.; Detwiller, B.; Dimopoulou, C.; Dracoulis, G. D.; Farinon, F.; Geissel, H.; Haettner, E.; Heil, M.; Kempley, R. S.; Knoebel, R.; Kozhuharov, C.; Kurcewicz, J.; Kuzminchuk, N.; Litvinov, S.; Liu, Z.; Mao, R.; Nociforo, C.; Nolden, F.; Plass, W. R.; Prochazka, A.; Scheidenberger, C.; Steck, M.; Stoehlker, Th.; Sun, B.; Swan, T. P. D.; Trees, G.

doi:10.1103/PhysRevLett.105.172501

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

作者：Reed, M. W.^*; Cullen, I. J.; Walker, P. M.; Litvinov, Yu. A.; Blaum, K.; Bosch, F.; Brandau, C.; Carroll, J. J.; Cullen, D. M.; Deo, A. Y.; Detwiller, B.; Dimopoulou, C.; Dracoulis, G. D.; Farinon, F.; Geissel, H.; Haettner, E.; Heil, M.; Kempley, R. S.; Knoebel, R.; Kozhuharov, C.; Kurcewicz, J.; Kuzminchuk, N.; Litvinov, S.; Liu, Z.; Mao, R.; Nociforo, C.; Nolden, F.; Plass, W. R.; Prochazka, A.; Scheidenberger, C.; Steck, M.; Stoehlker, Th.; Sun, B.; Swan, T. P. D.; Trees, G.

来源：Physical Review Letters, 2010, 105(17): 172501.

DOI：10.1103/PhysRevLett.105.172501

摘要

A study of cooled (197)Au 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 (183,184,186)Hf and (186,187)Ta. The results support the prediction of a strongly favored isomer region near neutron number 116.