Spectroscopy of Rf257

J. Qian, A. Heinz, T. L. Khoo, R. V.F. Janssens, D. Peterson, D. Seweryniak, I. Ahmad, M. Asai, B. B. Back, M. P. Carpenter, A. B. Garnsworthy, J. P. Greene, A. A. Hecht, C. L. Jiang, F. G. Kondev, T. Lauritsen, C. J. Lister, A. Robinson, G. Savard, R. ScottR. Vondrasek, X. Wang, R. Winkler, S. Zhu

Research output: Contribution to journalArticle

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Abstract

The isotope Rf257 was produced in the fusion-evaporation reaction Pb208(Ti50,n)Rf257. Reaction products were separated and identified by mass. Delayed spectroscopy of Rf257 and its decay products was performed. A partial decay scheme with configuration assignments is proposed based on α hindrance factors. The excitation energy of the 1/2+[620] configuration in No253 is proposed. The energy of this 1/2+ state in a series of N=151 isotones increases with nuclear charge, reflecting an increase in the N=152 gap. This gap is deduced to grow substantially from 850 to 1400 keV between Z=94 and 102. An isomeric state in Rf257, with a half-life of 160-31+42μs, was discovered by detecting internal conversion electrons followed by α decay. It is interpreted as a three-quasiparticle high-K isomer. A second group of internal conversion electrons, with a half-life of 4.1-1.3+2.4 s, followed by α decay, was also observed. These events might originate from the decay of excited states in Lr257, populated by electron-capture decay of Rf257. Fission of Rf257 was unambiguously detected, with a branching ratio of bRfSF=0.02±0.01.

Original languageEnglish
Article number064319
JournalPhysical Review C - Nuclear Physics
Volume79
Issue number6
DOIs
Publication statusPublished - Jun 22 2009

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decay
spectroscopy
internal conversion
half life
configurations
electron capture
reaction products
excitation
fission
electrons
isomers
isotopes
fusion
evaporation
energy
products

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

Cite this

Qian, J., Heinz, A., Khoo, T. L., Janssens, R. V. F., Peterson, D., Seweryniak, D., ... Zhu, S. (2009). Spectroscopy of Rf257. Physical Review C - Nuclear Physics, 79(6), [064319]. https://doi.org/10.1103/PhysRevC.79.064319

Spectroscopy of Rf257. / Qian, J.; Heinz, A.; Khoo, T. L.; Janssens, R. V.F.; Peterson, D.; Seweryniak, D.; Ahmad, I.; Asai, M.; Back, B. B.; Carpenter, M. P.; Garnsworthy, A. B.; Greene, J. P.; Hecht, A. A.; Jiang, C. L.; Kondev, F. G.; Lauritsen, T.; Lister, C. J.; Robinson, A.; Savard, G.; Scott, R.; Vondrasek, R.; Wang, X.; Winkler, R.; Zhu, S.

In: Physical Review C - Nuclear Physics, Vol. 79, No. 6, 064319, 22.06.2009.

Research output: Contribution to journalArticle

Qian, J, Heinz, A, Khoo, TL, Janssens, RVF, Peterson, D, Seweryniak, D, Ahmad, I, Asai, M, Back, BB, Carpenter, MP, Garnsworthy, AB, Greene, JP, Hecht, AA, Jiang, CL, Kondev, FG, Lauritsen, T, Lister, CJ, Robinson, A, Savard, G, Scott, R, Vondrasek, R, Wang, X, Winkler, R & Zhu, S 2009, 'Spectroscopy of Rf257', Physical Review C - Nuclear Physics, vol. 79, no. 6, 064319. https://doi.org/10.1103/PhysRevC.79.064319
Qian J, Heinz A, Khoo TL, Janssens RVF, Peterson D, Seweryniak D et al. Spectroscopy of Rf257. Physical Review C - Nuclear Physics. 2009 Jun 22;79(6). 064319. https://doi.org/10.1103/PhysRevC.79.064319
Qian, J. ; Heinz, A. ; Khoo, T. L. ; Janssens, R. V.F. ; Peterson, D. ; Seweryniak, D. ; Ahmad, I. ; Asai, M. ; Back, B. B. ; Carpenter, M. P. ; Garnsworthy, A. B. ; Greene, J. P. ; Hecht, A. A. ; Jiang, C. L. ; Kondev, F. G. ; Lauritsen, T. ; Lister, C. J. ; Robinson, A. ; Savard, G. ; Scott, R. ; Vondrasek, R. ; Wang, X. ; Winkler, R. ; Zhu, S. / Spectroscopy of Rf257. In: Physical Review C - Nuclear Physics. 2009 ; Vol. 79, No. 6.
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