Journal article

Publication year: 2013

Journal: Physical Review Letters

Volume number: 110

Issue number: 12

ISSN: 0031-9007

Open access status: Green

DOI Link: https://doi.org/10.1103/PhysRevLett.110.122502

Publisher: American Physical Society

Abstract: 
Long-lived isomers in Bi-212 have been studied following U-238 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 Bi-212 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. DOI: 10.1103/PhysRevLett.110.122502

Harvard Citation style: Chen, L., Walker, P., Geissel, H., Litvinov, Y., Beckert, K., Beller, P., et al. (2013) Direct Observation of Long-Lived Isomers in ²¹²Bi, Physical Review Letters, 110(12), Article 122502. https://doi.org/10.1103/PhysRevLett.110.122502

APA Citation style: Chen, L., Walker, P., Geissel, H., Litvinov, Y., Beckert, K., Beller, P., Bosch, F., Boutin, D., Caceres, L., Carroll, J., Cullen, D., Cullen, I., Franzke, B., Gerl, J., Gorska, M., Jones, G., Kishada, A., Knoebel, R., Kozhuharov, C., ...Yamaguchi, T. (2013). Direct Observation of Long-Lived Isomers in ²¹²Bi. Physical Review Letters. 110(12), Article 122502. https://doi.org/10.1103/PhysRevLett.110.122502