Decay and Fission Hindrance of Two- and Four-Quasiparticle K Isomers in 254Rf
David, H.M., Chen, J., Seweryniak, D., Kondev, F.G., Gates, J.M., Gregorich, K.E., Ahmad, I., Albers, M., Alcorta, M., Back, B.B., Baartman, B., Bertone, P.F., Bernstein, L.A., Campbell, C.M., Carpenter, M.P., Chiara, C.J., Clark, R.M., Cromaz, M., Doherty, D.T., . . . Zhu, S. (2015). Decay and Fission Hindrance of Two- and Four-Quasiparticle K Isomers in 254Rf. Physical Review Letters, 115(13), Article 132502. https://doi.org/10.1103/PhysRevLett.115.132502
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Physical Review LettersDate
2015Copyright
© 2015 American Physical Society. Published in this repository with the kind permission of the publisher.
Two isomers decaying by electromagnetic transitions with half-lives of 4.7(1.1) and 247ð73Þ μs
have been discovered in the heavy 254Rf nucleus. The observation of the shorter-lived isomer was made
possible by a novel application of a digital data acquisition system. The isomers were interpreted as the
Kπ ¼ 8−, ν2ð7=2þ½624; 9=2−½734Þ two-quasineutron and the Kπ ¼ 16þ, 8−ν2ð7=2þ½624; 9=2−½734Þ ⊗
8−π2ð7=2−½514; 9=2þ½624Þ four-quasiparticle configurations, respectively. Surprisingly, the lifetime of
the two-quasiparticle isomer is more than 4 orders of magnitude shorter than what has been observed for
analogous isomers in the lighter N ¼ 150 isotones. The four-quasiparticle isomer is longer lived than the
254Rf ground state that decays exclusively by spontaneous fission with a half-life of 23.2ð1.1Þ μs. The
absence of sizable fission branches from either of the isomers implies unprecedented fission hindrance
relative to the ground state.
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