Direct Observation of Long-Lived Isomers in 212Bi

Chen, L.; Walker, P.M.; Geissel, H.; Litivnov, Yuri; Beckert, K.; Beller, P.; Bosch, F.; Boutin, D.; Caceres, L.; Carroll, J.J.; Cullen, D.M.; Cullen, I.J.; Franzke, B.; Gerl, J.; Górska, M.; Jones, G. A.; Kishada, A.; Knöbel, R.; Kozhuharov, C.; Kurcewicz, J.; Litvinov, S.A.; Liu, Z.; Mandal, S.; Montes, F.; Münzenberg, G.; Nolden, F.; Ohtsubo, T.; Patyk, Z.; Plaß, Zs.; Podolyák, W.R.; Rigby, S.; Saito, N.; Saito, T.; Scheidenberger, C.; Simpson, E.C.; Shindo, M.; Steck, M.; Sun, B.; Williams, S.J.; Weick, H.; Winkler, M.; Wollersheim, H.-J.; Yamaguchi, T.

doi:10.1103/PhysRevLett.110.122502

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Direct Observation of Long-Lived Isomers in ²¹²Bi

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Litivnov, Yuri
GSI Helmholtzzentrum für Schwerionenforschung;
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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http://link.aps.org/doi/10.1103/PhysRevLett.110.122502
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Zitation

Chen, L., Walker, P., Geissel, H., Litivnov, Y., Beckert, K., Beller, P., et al. (2013). Direct Observation of Long-Lived Isomers in ²¹²Bi. Physical Review Letters, 110(12): 122502, pp. 1-5. doi:10.1103/PhysRevLett.110.122502.

Zitierlink: https://hdl.handle.net/11858/00-001M-0000-000E-E730-A

Zusammenfassung

Long-lived isomers in ²¹²Bi have been studied following ²³⁸U projectile fragmentation at 670 MeV per nucleon. The fragmentation products were injected as highly charged ions into a storage ring, giving access to masses and half-lives. While the excitation energy of the first isomer of ²¹²Bi was confirmed, the second isomer was observed at 1478(30) keV, in contrast to the previously accepted value of >1910 keV. It was also found to have an extended Lorentz-corrected in-ring half-life >30 min, compared to 7.0(3) min for the neutral atom. Both the energy and half-life differences can be understood as being due a substantial, though previously unrecognized, internal decay branch for neutral atoms. Earlier shell-model calculations are now found to give good agreement with the isomer excitation energy. Furthermore, these and new calculations predict the existence of states at slightly higher energy that could facilitate isomer deexcitation studies.