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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.

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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