Electromagnetic decays of excited states in Sg261 (Z=106) and Rf257 (Z=104)

J. S. Berryman; R. M. Clark; K. E. Gregorich; J. M. Allmond; D. L. Bleuel; M. Cromaz; I. Dragojević; J. Dvorak; P. A. Ellison; P. Fallon; M. A. Garcia; S. Gros; I. Y. Lee; A. O. MacChiavelli; S. Paschalis; M. Petri; J. Qian; M. A. Stoyer; M. Wiedeking

doi:10.1103/PhysRevC.81.064325

Electromagnetic decays of excited states in Sg261 (Z=106) and Rf257 (Z=104)

J. S. Berryman, R. M. Clark, K. E. Gregorich, J. M. Allmond, D. L. Bleuel, M. Cromaz, I. Dragojević, J. Dvorak, P. A. Ellison, P. Fallon, M. A. Garcia, S. Gros, I. Y. Lee, A. O. MacChiavelli, S. Paschalis, M. Petri, J. Qian, M. A. Stoyer, M. Wiedeking

Physics

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Abstract

An isomeric one-quasineutron state, likely based on the [725]11/2 ^- Nilsson level, was identified in Sg261 by its decay via internal conversion electrons. The state has an excitation energy of ≈200 keV and a half-life of 9.0-1.5+2.0 μs. Sg261 has the highest Z and A of any nucleus in which the electromagnetic decay of an isomeric state was observed to date. A separate experiment was performed on the α daughter nucleus of Sg261, namely Rf257. Spectroscopy of delayed γ rays and converted electrons from Rf257 resulted in the identification of a K isomer at an excitation energy of ≈1125 keV with a half-life of 134.9 ± 7.7 μs. The spin of the isomeric state is tentatively assigned I=21/2,23/2 and the state likely decays to a rotational band built on the [725]11/2^- Nilsson level via a ΔK=5 or 6 transition. The present results provide new information on excited states in the transactinide region, which is important for testing models of the heaviest elements.

Original language	English
Article number	064325
Journal	Physical Review C
Volume	81
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevC.81.064325
Publication status	Published - 2010

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Berryman, J. S., Clark, R. M., Gregorich, K. E., Allmond, J. M., Bleuel, D. L., Cromaz, M., Dragojević, I., Dvorak, J., Ellison, P. A., Fallon, P., Garcia, M. A., Gros, S., Lee, I. Y., MacChiavelli, A. O., Paschalis, S., Petri, M., Qian, J., Stoyer, M. A., & Wiedeking, M. (2010). Electromagnetic decays of excited states in Sg261 (Z=106) and Rf257 (Z=104). Physical Review C, 81(6), Article 064325. https://doi.org/10.1103/PhysRevC.81.064325

@article{14c91e7bbd4a40449d67bb4039acd2c3,

title = "Electromagnetic decays of excited states in Sg261 (Z=106) and Rf257 (Z=104)",

abstract = "An isomeric one-quasineutron state, likely based on the [725]11/2 - Nilsson level, was identified in Sg261 by its decay via internal conversion electrons. The state has an excitation energy of ≈200 keV and a half-life of 9.0-1.5+2.0 μs. Sg261 has the highest Z and A of any nucleus in which the electromagnetic decay of an isomeric state was observed to date. A separate experiment was performed on the α daughter nucleus of Sg261, namely Rf257. Spectroscopy of delayed γ rays and converted electrons from Rf257 resulted in the identification of a K isomer at an excitation energy of ≈1125 keV with a half-life of 134.9 ± 7.7 μs. The spin of the isomeric state is tentatively assigned I=21/2,23/2 and the state likely decays to a rotational band built on the [725]11/2- Nilsson level via a ΔK=5 or 6 transition. The present results provide new information on excited states in the transactinide region, which is important for testing models of the heaviest elements.",

author = "Berryman, {J. S.} and Clark, {R. M.} and Gregorich, {K. E.} and Allmond, {J. M.} and Bleuel, {D. L.} and M. Cromaz and I. Dragojevi{\'c} and J. Dvorak and Ellison, {P. A.} and P. Fallon and Garcia, {M. A.} and S. Gros and Lee, {I. Y.} and MacChiavelli, {A. O.} and S. Paschalis and M. Petri and J. Qian and Stoyer, {M. A.} and M. Wiedeking",

year = "2010",

doi = "10.1103/PhysRevC.81.064325",

language = "English",

volume = "81",

journal = "Physical Review C",

issn = "0556-2813",

publisher = "American Physical Society",

number = "6",

}

Berryman, JS, Clark, RM, Gregorich, KE, Allmond, JM, Bleuel, DL, Cromaz, M, Dragojević, I, Dvorak, J, Ellison, PA, Fallon, P, Garcia, MA, Gros, S, Lee, IY, MacChiavelli, AO, Paschalis, S , Petri, M, Qian, J, Stoyer, MA & Wiedeking, M 2010, 'Electromagnetic decays of excited states in Sg261 (Z=106) and Rf257 (Z=104)', Physical Review C, vol. 81, no. 6, 064325. https://doi.org/10.1103/PhysRevC.81.064325

TY - JOUR

T1 - Electromagnetic decays of excited states in Sg261 (Z=106) and Rf257 (Z=104)

AU - Berryman, J. S.

AU - Clark, R. M.

AU - Gregorich, K. E.

AU - Allmond, J. M.

AU - Bleuel, D. L.

AU - Cromaz, M.

AU - Dragojević, I.

AU - Dvorak, J.

AU - Ellison, P. A.

AU - Fallon, P.

AU - Garcia, M. A.

AU - Gros, S.

AU - Lee, I. Y.

AU - MacChiavelli, A. O.

AU - Paschalis, S.

AU - Petri, M.

AU - Qian, J.

AU - Stoyer, M. A.

AU - Wiedeking, M.

PY - 2010

Y1 - 2010

N2 - An isomeric one-quasineutron state, likely based on the [725]11/2 - Nilsson level, was identified in Sg261 by its decay via internal conversion electrons. The state has an excitation energy of ≈200 keV and a half-life of 9.0-1.5+2.0 μs. Sg261 has the highest Z and A of any nucleus in which the electromagnetic decay of an isomeric state was observed to date. A separate experiment was performed on the α daughter nucleus of Sg261, namely Rf257. Spectroscopy of delayed γ rays and converted electrons from Rf257 resulted in the identification of a K isomer at an excitation energy of ≈1125 keV with a half-life of 134.9 ± 7.7 μs. The spin of the isomeric state is tentatively assigned I=21/2,23/2 and the state likely decays to a rotational band built on the [725]11/2- Nilsson level via a ΔK=5 or 6 transition. The present results provide new information on excited states in the transactinide region, which is important for testing models of the heaviest elements.

AB - An isomeric one-quasineutron state, likely based on the [725]11/2 - Nilsson level, was identified in Sg261 by its decay via internal conversion electrons. The state has an excitation energy of ≈200 keV and a half-life of 9.0-1.5+2.0 μs. Sg261 has the highest Z and A of any nucleus in which the electromagnetic decay of an isomeric state was observed to date. A separate experiment was performed on the α daughter nucleus of Sg261, namely Rf257. Spectroscopy of delayed γ rays and converted electrons from Rf257 resulted in the identification of a K isomer at an excitation energy of ≈1125 keV with a half-life of 134.9 ± 7.7 μs. The spin of the isomeric state is tentatively assigned I=21/2,23/2 and the state likely decays to a rotational band built on the [725]11/2- Nilsson level via a ΔK=5 or 6 transition. The present results provide new information on excited states in the transactinide region, which is important for testing models of the heaviest elements.

UR - http://www.scopus.com/inward/record.url?scp=77954648341&partnerID=8YFLogxK

U2 - 10.1103/PhysRevC.81.064325

DO - 10.1103/PhysRevC.81.064325

M3 - Article

AN - SCOPUS:77954648341

SN - 0556-2813

VL - 81

JO - Physical Review C

JF - Physical Review C

IS - 6

M1 - 064325

ER -

Electromagnetic decays of excited states in Sg261 (Z=106) and Rf257 (Z=104)

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