Decay and Fission Hindrance of Two- and Four-Quasiparticle K Isomers in Rf 254

H. M. David; J. Chen; D. Seweryniak; F. G. Kondev; J. M. Gates; K. E. Gregorich; I. Ahmad; M. Albers; M. Alcorta; B. B. Back; B. Baartman; P. F. Bertone; L. A. Bernstein; C. M. Campbell; M. P. Carpenter; C. J. Chiara; R. M. Clark; M. Cromaz; D. T. Doherty; G. D. Dracoulis; N. E. Esker; P. Fallon; O. R. Gothe; J. P. Greene; P. T. Greenlees; D. J. Hartley; K. Hauschild; C. R. Hoffman; S. S. Hota; R. V.F. Janssens; T. L. Khoo; J. Konki; J. T. Kwarsick; T. Lauritsen; A. O. Macchiavelli; P. R. Mudder; C. Nair; Y. Qiu; J. Rissanen; A. M. Rogers; P. Ruotsalainen; G. Savard; S. Stolze; A. Wiens; S. Zhu

doi:10.1103/PhysRevLett.115.132502

Decay and Fission Hindrance of Two- and Four-Quasiparticle K Isomers in Rf 254

H. M. David
, J. Chen
, D. Seweryniak^*
, F. G. Kondev
, J. M. Gates
, K. E. Gregorich
, I. Ahmad
, M. Albers
, M. Alcorta
, B. B. Back
, B. Baartman
, P. F. Bertone
, L. A. Bernstein
, C. M. Campbell
, M. P. Carpenter
, C. J. Chiara
, R. M. Clark
, M. Cromaz
, D. T. Doherty
, G. D. Dracoulis

N. E. Esker, P. Fallon, O. R. Gothe, J. P. Greene, P. T. Greenlees, D. J. Hartley, K. Hauschild, C. R. Hoffman, S. S. Hota, R. V.F. Janssens, T. L. Khoo, J. Konki, J. T. Kwarsick, T. Lauritsen, A. O. Macchiavelli, P. R. Mudder, C. Nair, Y. Qiu, J. Rissanen, A. M. Rogers, P. Ruotsalainen, G. Savard, S. Stolze, A. Wiens, S. Zhu

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

51 Citations (Scopus)

Abstract

Two isomers decaying by electromagnetic transitions with half-lives of 4.7(1.1) and 247(73)μs have been discovered in the heavy Rf254 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=8-, ν2(7/2+[624],9/2-[734]) two-quasineutron and the Kπ=16+, 8-ν2(7/2+[624],9/2-[734])⊗ - 8-π2(7/2-[514],9/2+[624]) 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=150 isotones. The four-quasiparticle isomer is longer lived than the Rf254 ground state that decays exclusively by spontaneous fission with a half-life of 23.2(1.1)μs. The absence of sizable fission branches from either of the isomers implies unprecedented fission hindrance relative to the ground state.

Original language	English
Article number	132502
Journal	Physical Review Letters
Volume	115
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevLett.115.132502
Publication status	Published - 24 Sept 2015

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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 Rf 254. Physical Review Letters, 115(3), Article 132502. https://doi.org/10.1103/PhysRevLett.115.132502

@article{ecd66a8ae7634a36a17330a6eb7bbba1,

title = "Decay and Fission Hindrance of Two- and Four-Quasiparticle K Isomers in Rf 254",

abstract = "Two isomers decaying by electromagnetic transitions with half-lives of 4.7(1.1) and 247(73)μs have been discovered in the heavy Rf254 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=8-, ν2(7/2+[624],9/2-[734]) two-quasineutron and the Kπ=16+, 8-ν2(7/2+[624],9/2-[734])⊗ - 8-π2(7/2-[514],9/2+[624]) 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=150 isotones. The four-quasiparticle isomer is longer lived than the Rf254 ground state that decays exclusively by spontaneous fission with a half-life of 23.2(1.1)μs. The absence of sizable fission branches from either of the isomers implies unprecedented fission hindrance relative to the ground state.",

author = "David, \{H. M.\} and J. Chen and D. Seweryniak and Kondev, \{F. G.\} and Gates, \{J. M.\} and Gregorich, \{K. E.\} and I. Ahmad and M. Albers and M. Alcorta and Back, \{B. B.\} and B. Baartman and Bertone, \{P. F.\} and Bernstein, \{L. A.\} and Campbell, \{C. M.\} and Carpenter, \{M. P.\} and Chiara, \{C. J.\} and Clark, \{R. M.\} and M. Cromaz and Doherty, \{D. T.\} and Dracoulis, \{G. D.\} and Esker, \{N. E.\} and P. Fallon and Gothe, \{O. R.\} and Greene, \{J. P.\} and Greenlees, \{P. T.\} and Hartley, \{D. J.\} and K. Hauschild and Hoffman, \{C. R.\} and Hota, \{S. S.\} and Janssens, \{R. V.F.\} and Khoo, \{T. L.\} and J. Konki and Kwarsick, \{J. T.\} and T. Lauritsen and Macchiavelli, \{A. O.\} and Mudder, \{P. R.\} and C. Nair and Y. Qiu and J. Rissanen and Rogers, \{A. M.\} and P. Ruotsalainen and G. Savard and S. Stolze and A. Wiens and S. Zhu",

note = "Publisher Copyright: {\textcopyright} 2015 American Physical Society. {\textcopyright} 2015 American Physical Society.",

year = "2015",

month = sep,

day = "24",

doi = "10.1103/PhysRevLett.115.132502",

language = "English",

volume = "115",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "3",

}

David, HM, Chen, J, Seweryniak, D, Kondev, FG, Gates, JM, Gregorich, KE, Ahmad, I, Albers, M, Alcorta, M, Back, BB, Baartman, B, Bertone, PF, Bernstein, LA, Campbell, CM, Carpenter, MP, Chiara, CJ, Clark, RM, Cromaz, M, Doherty, DT, Dracoulis, GD, Esker, NE, Fallon, P, Gothe, OR, Greene, JP, Greenlees, PT, Hartley, DJ, Hauschild, K, Hoffman, CR, Hota, SS, Janssens, RVF, Khoo, TL, Konki, J, Kwarsick, JT, Lauritsen, T, Macchiavelli, AO, Mudder, PR, Nair, C, Qiu, Y, Rissanen, J, Rogers, AM, Ruotsalainen, P, Savard, G, Stolze, S, Wiens, A & Zhu, S 2015, 'Decay and Fission Hindrance of Two- and Four-Quasiparticle K Isomers in Rf 254', Physical Review Letters, vol. 115, no. 3, 132502. https://doi.org/10.1103/PhysRevLett.115.132502

TY - JOUR

T1 - Decay and Fission Hindrance of Two- and Four-Quasiparticle K Isomers in Rf 254

AU - David, H. M.

AU - Chen, J.

AU - Seweryniak, D.

AU - Kondev, F. G.

AU - Gates, J. M.

AU - Gregorich, K. E.

AU - Ahmad, I.

AU - Albers, M.

AU - Alcorta, M.

AU - Back, B. B.

AU - Baartman, B.

AU - Bertone, P. F.

AU - Bernstein, L. A.

AU - Campbell, C. M.

AU - Carpenter, M. P.

AU - Chiara, C. J.

AU - Clark, R. M.

AU - Cromaz, M.

AU - Doherty, D. T.

AU - Dracoulis, G. D.

AU - Esker, N. E.

AU - Fallon, P.

AU - Gothe, O. R.

AU - Greene, J. P.

AU - Greenlees, P. T.

AU - Hartley, D. J.

AU - Hauschild, K.

AU - Hoffman, C. R.

AU - Hota, S. S.

AU - Janssens, R. V.F.

AU - Khoo, T. L.

AU - Konki, J.

AU - Kwarsick, J. T.

AU - Lauritsen, T.

AU - Macchiavelli, A. O.

AU - Mudder, P. R.

AU - Nair, C.

AU - Qiu, Y.

AU - Rissanen, J.

AU - Rogers, A. M.

AU - Ruotsalainen, P.

AU - Savard, G.

AU - Stolze, S.

AU - Wiens, A.

AU - Zhu, S.

PY - 2015/9/24

Y1 - 2015/9/24

N2 - Two isomers decaying by electromagnetic transitions with half-lives of 4.7(1.1) and 247(73)μs have been discovered in the heavy Rf254 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=8-, ν2(7/2+[624],9/2-[734]) two-quasineutron and the Kπ=16+, 8-ν2(7/2+[624],9/2-[734])⊗ - 8-π2(7/2-[514],9/2+[624]) 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=150 isotones. The four-quasiparticle isomer is longer lived than the Rf254 ground state that decays exclusively by spontaneous fission with a half-life of 23.2(1.1)μs. The absence of sizable fission branches from either of the isomers implies unprecedented fission hindrance relative to the ground state.

AB - Two isomers decaying by electromagnetic transitions with half-lives of 4.7(1.1) and 247(73)μs have been discovered in the heavy Rf254 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=8-, ν2(7/2+[624],9/2-[734]) two-quasineutron and the Kπ=16+, 8-ν2(7/2+[624],9/2-[734])⊗ - 8-π2(7/2-[514],9/2+[624]) 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=150 isotones. The four-quasiparticle isomer is longer lived than the Rf254 ground state that decays exclusively by spontaneous fission with a half-life of 23.2(1.1)μs. The absence of sizable fission branches from either of the isomers implies unprecedented fission hindrance relative to the ground state.

UR - https://www.scopus.com/pages/publications/84943328976

U2 - 10.1103/PhysRevLett.115.132502

DO - 10.1103/PhysRevLett.115.132502

M3 - Article

SN - 0031-9007

VL - 115

JO - Physical Review Letters

JF - Physical Review Letters

IS - 3

M1 - 132502

ER -

Decay and Fission Hindrance of Two- and Four-Quasiparticle K Isomers in Rf 254

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