Discovery of highly excited long-lived isomers in neutron-rich hafnium and tantalum isotopes through direct mass measurements

A study of cooled ¹⁹⁷Au 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(,)¹⁸⁶Hf and ¹⁸⁶(,)¹⁸⁷Ta....

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Veröffentlicht in:	Physical review letters 2010-10, Vol.105 (17), p.172501-172501, Article 172501
Hauptverfasser:	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, Knöbel, 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, Stöhlker, Th, Sun, B, Swan, T P D, Trees, G, Weick, H, Winckler, N, Winkler, M, Woods, P J, Yamaguchi, T
Format:	Artikel
Sprache:	eng
Schlagworte:	BARYONS BETA DECAY RADIOISOTOPES BETA-MINUS DECAY RADIOISOTOPES ELEMENTARY PARTICLES ELEMENTS ENERGY LEVELS ENERGY RANGE ENERGY-LEVEL TRANSITIONS EVEN-EVEN NUCLEI EVEN-ODD NUCLEI EXCITATION EXCITED STATES FERMIONS GOLD 197 GOLD ISOTOPES HADRONS HAFNIUM HAFNIUM 183 HAFNIUM 184 HAFNIUM 186 HAFNIUM ISOTOPES HALF-LIFE HEAVY NUCLEI HOURS LIVING RADIOISOTOPES INTERNAL CONVERSION RADIOISOTOPES ISOMERIC NUCLEI ISOMERIC TRANSITION ISOTOPES ISOTOPES METALS MEV RANGE MINUTES LIVING RADIOISOTOPES NEUTRONS NUCLEAR FRAGMENTATION NUCLEAR FRAGMENTS NUCLEAR PHYSICS AND RADIATION PHYSICS NUCLEAR REACTIONS NUCLEI NUCLEONS ODD-EVEN NUCLEI ODD-ODD NUCLEI RADIOISOTOPES REFRACTORY METALS SECONDS LIVING RADIOISOTOPES STABLE ISOTOPES STORAGE RINGS TANTALUM 186 TANTALUM 187 TANTALUM ISOTOPES TRANSITION ELEMENTS
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Zusammenfassung:	A study of cooled ¹⁹⁷Au 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(,)¹⁸⁶Hf and ¹⁸⁶(,)¹⁸⁷Ta. The results support the prediction of a strongly favored isomer region near neutron number 116.
ISSN:	0031-9007 1079-7114
DOI:	10.1103/physrevlett.105.172501