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Open Access Publications from the University of California

Decay spectroscopy of element 115 daughters: Rg 280 → Mt 276 and Mt 276 → Bh 272

  • Author(s): Gates, JM
  • Gregorich, KE
  • Gothe, OR
  • Uribe, EC
  • Pang, GK
  • Bleuel, DL
  • Block, M
  • Clark, RM
  • Campbell, CM
  • Crawford, HL
  • Cromaz, M
  • Di Nitto, A
  • Düllmann, CE
  • Esker, NE
  • Fahlander, C
  • Fallon, P
  • Farjadi, RM
  • Forsberg, U
  • Khuyagbaatar, J
  • Loveland, W
  • Macchiavelli, AO
  • May, EM
  • Mudder, PR
  • Olive, DT
  • Rice, AC
  • Rissanen, J
  • Rudolph, D
  • Sarmiento, LG
  • Shusterman, JA
  • Stoyer, MA
  • Wiens, A
  • Yakushev, A
  • Nitsche, H
  • et al.

© 2015 American Physical Society. Forty-six decay chains, assigned to the decay of 115288, were produced using the Am243(Ca48,3n)115288 reaction at the Lawrence Berkeley National Laboratory 88-in. cyclotron. The resulting series of α decays were studied using α-photon and α-x-ray spectroscopies. Multiple α-photon coincidences were observed in the element 115 decay chain members, particularly in the third- and fourth-generation decays (presumed to be Rg280 and Mt276, respectively). Upon combining these data with those from 22 115288 decay chains observed in a similar experiment, updated level schemes in Mt276 and Bh272 (populated by the α decay of Rg280 and Mt276, respectively) are proposed. Photons were observed in the energy range expected for K x rays coincident with the α decay of both Rg280 and Mt276. However, Compton scattering of higher-energy γ rays and discrete transitions are present in the K x-ray region preventing a definitive Z identification to be made based on observation of characteristic K x-ray energies.

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