Decay spectroscopy of element 115 daughters: Rg280→Mt276 and Mt276→Bh272

Gates, J. M.; Gregorich, K. E.; Gothe, O. R.; Uribe, E. C.; Pang, G. K.; Bleuel, D. L.; Block, M.; Clark, R. M.; Campbell, C. M.; Crawford, H. L.; Cromaz, M.; Di Nitto, A.; Düllmann, Ch. E.; Esker, N. E.; Fahlander, C.; Fallon, P.; Farjadi, R. M.; Forsberg, U.; Khuyagbaatar, J.; Loveland, W.; Macchiavelli, A. O.; May, E. M.; Mudder, P. R.; Olive, D. T.; Rice, A. C.; Rissanen, J.; Rudolph, D.; Sarmiento, L. G.; Shusterman, J. A.; Stoyer, M. A.; Wiens, A.; Yakushev, A.; Nitsche, H.

doi:10.1103/PhysRevC.92.021301

Title: Decay spectroscopy of element 115 daughters: ${}^{280}{Rg} \to {}^{276}{Mt}$ and ${}^{276}{Mt} \to {}^{272}{Bh}$

Journal Article · Mon Aug 03 00:00:00 EDT 2015 · Physical Review C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.92.021301· OSTI ID:1393336

Gates, J. M. ^[1]; Gregorich, K. E. ^[1]; Gothe, O. R. ^[2]; Uribe, E. C. ^[2]; Pang, G. K. ^[1]; Bleuel, D. L. ^[3]; Block, M. ^[4]; Clark, R. M. ^[1]; Campbell, C. M. ^[1]; Crawford, H. L. ^[1]; Cromaz, M. ^[1]; Di Nitto, A. ^[5]; Düllmann, Ch. E. ^[6]; Esker, N. E. ^[2]; Fahlander, C. ^[7]; Fallon, P. ^[1]; Farjadi, R. M. ^[1]; Forsberg, U. ^[7]; Khuyagbaatar, J. ^[8]; Loveland, W. ^[9] more »

Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
GSI Helmholtzzentrum fur Schwerionenforschung GmbH (Germany)
Johannes Gutenberg-Universitat Mainz (Germany)
GSI Helmholtzzentrum fur Schwerionenforschung GmbH (Germany); Johannes Gutenberg-Universitat Mainz (Germany); Helmholtz Institute Mainz (Germany)
Lund Univ. (Sweden)
GSI Helmholtzzentrum fur Schwerionenforschung GmbH (Germany); Helmholtz Institute Mainz (Germany)
Oregon State Univ., Corvallis, OR (United States)

In this study, 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. Additionally, 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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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), High Energy Physics (HEP); USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: AC52-07NA27344; AC02-05CH11231; FG06-97ER41026

OSTI ID:: 1393336

Alternate ID(s):: OSTI ID: 1208207

Report Number(s):: LLNL-JRNL-737626; PRVCAN

Journal Information:: Physical Review C, Nuclear Physics, Vol. 92, Issue 2; ISSN 0556-2813

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 48 works

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