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Decay spectroscopy of element 115 daughters:Rg280Mt276 and Mt276Bh272

J. M. Gates et al.
Phys. Rev. C 92, 021301(R) – Published 3 August 2015
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Abstract

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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  • Received 13 March 2015
  • Revised 5 May 2015

DOI:https://doi.org/10.1103/PhysRevC.92.021301

©2015 American Physical Society

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Vol. 92, Iss. 2 — August 2015

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