High-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>K</mml:mi></mml:mrow></mml:math>structure in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Fm</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>250</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>and the deformed shell gaps at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>N</mml:mi><m

Greenlees, P. T.; Herzberg, R.‐D.; Ketelhut, S.; Butler, P. A.; Chowdhury, P.; Grahn, T.; Gray‐Jones, C.; Jones, G.D.; Jones, P. M.; Julin, R.; Juutinen, S.; Khoo, T. L.; Leino, M.; Moon, Se Youn; Nyman, M.; Pakarinen, J.; Rahkila, P.; Rostron, D.; Sarén, J.; Scholey, C.; Sorri, J.; Tandel, S. K.; Uusitalo, J.; Venhart, M.

doi:10.1103/physrevc.78.021303

Cited by 72 publications

(47 citation statements)

References 26 publications

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“…Using this simulation, it was found that a threshold of 130 keV corresponds to an efficiency of 18% for detecting isomeric electrons (mostly from a single 200-keV transition). After correcting for the deadtime of the data acquisition system, the known α decay branch of the 8 + state [23] and the simulated electron detection efficiency (18%), the isomer ratio for the 8 + state in 216 Th was found to be 0.18 (6), in reasonable agreement with the previous value of 0.34(11) [26].…”

supporting

confidence: 82%

“…Furthermore, the known 2 − octupole bands exhibit [4][5][6] many interband transitions to the ground-state band, contrary to the proposed decay scheme of Ref. [16].…”

Section: Possibility That the 8 − 2-qp State Is Not Isomericmentioning

confidence: 96%

“…The probability is high in [4][5][6][7][8] in N =150 isotones with Z = 94, 96, 100 and 102, which have remarkably similar (within a factor of 6) partial half-lives for decay to the 8 + ground-band levels.…”

Section: Possibility Of Fission Decay Of a 2-qp Isomermentioning

confidence: 99%

“…The occurrence of high-K isomers in 254 No [2,3], a series of N = 150 isotones [4][5][6][7][8] and several adjacent nuclei establishes that K is a good quantum number in the heavy nuclei in an extended region of the periodic table, i.e. the nuclei have axially-symmetric prolate deformed shapes.…”

mentioning

confidence: 99%

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Search for a 2-quasiparticle high-Kisomer inRf256

Robinson¹,

Khoo²,

Seweryniak³

et al. 2011

Phys. Rev. C

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The energies of 2-quasiparticle (qp) states in heavy shell-stabilized nuclei provide information on the single-particle states that are responsible for the stability of superheavy nuclei. We have calculated the energies of 2-qp states in 256 Rf, which suggest that a long-lived, low-energy 8 − isomer should exist. A search was conducted for this isomer through a calorimetric conversion electron signal, sandwiched in time between implantation of a 256 Rf nucleus and its fission decay, all within the same pixel of a double-sided Si strip detector. A 17(5) µs isomer was identified. However, its low population, ∼5(2)% that of the ground-state instead of the expected ∼30%, suggests that it is more likely a 4-qp isomer. Possible reasons for the absence of an electromagnetic signature of a 2-qp isomer decay are discussed. These include the favored possibility that the isomer decays by fission, with a half life indistinguishably close to that of the ground state. Another possibility, that there is no 2-qp isomer at all, would imply an abrupt termination of axially-symmetric deformed shapes at Z = 104, which describes nuclei with Z= 92 -103 very well.

show abstract

supporting

confidence: 82%

“…Furthermore, the known 2 − octupole bands exhibit [4][5][6] many interband transitions to the ground-state band, contrary to the proposed decay scheme of Ref. [16].…”

Section: Possibility That the 8 − 2-qp State Is Not Isomericmentioning

confidence: 96%

Section: Possibility Of Fission Decay Of a 2-qp Isomermentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Search for a 2-quasiparticle high-Kisomer inRf256

Robinson¹,

Khoo²,

Seweryniak³

et al. 2011

Phys. Rev. C

Self Cite

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show abstract

“…This assignment was made by analogy with other N = 150 isotones. In fact, K π = 8 − isomers have been found in 244 Pu [16,17], 246 Cm [16,18], 248 Cf [19], and 250 Fm [20]. Very similar level schemes are observed in 246 Cm and 250 Fm, where the I π = 8 − isomer decays into the ground-state rotational bands via an intermediate excited band.…”

Section: Introductionmentioning

confidence: 75%