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

https://ir.library.oregonstate.edu/concern/articles/z890rv98s

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  • Forty-six decay chains, assigned to the decay of ²⁸⁸115, were produced using the ²⁴³Am(⁴⁸Ca,3n) ²⁸⁸115 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 ²⁸⁰Rg and ²⁷⁶Mt, respectively). Upon combining these data with those from 22 ²⁸⁸115 decay chains observed in a similar experiment, updated level schemes in ²⁷⁶Mt and ²⁷²Bh (populated by the α decay of ²⁸⁰Rg and ²⁷⁶Mt, respectively) are proposed. Photons were observed in the energy range expected for K x rays coincident with the α decay of both ²⁸⁰Rg and ²⁷⁶Mt. 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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  • Gates, J. M., Gregorich, K. E., Gothe, O. R., Uribe, E. C., Pang, G. K., Bleuel, D. L., ... & Nitsche, H. (2015). Decay spectroscopy of element 115 daughters: ²⁸⁰Rg → ²⁷⁶Mt and ²⁷⁶Mt → ²⁷²Bh. Physical Review C, 92(2), 021301. doi:10.1103/PhysRevC.92.021301
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  • 92
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  • 2
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  • This material is based upon work supported by the US Department of Energy, Office of Science, Office of High Energy and Nuclear Physics under Contracts No. DE-AC02-05CH11231 and No. DE-FG06-97ER41026, the Swedish Research Council, and the Royal Physiographic Society in Lund. The LLNL contribution was performed under the auspices of the US Department of Energy by Lawrence Livermore National Laboratory under Contract No. DE-AC52-07NA27344. A.DiN. is financially supported by the Helmholtz-Institute Mainz.
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