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

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

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