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

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.
Authors:
 [1] ;  [1] ;  [2] ;  [2] ;  [1] ;  [3] ;  [4] ;  [1] ;  [1] ;  [1] ;  [1] ;  [5] ;  [6] ;  [2] ;  [7] ;  [1] ;  [1] ;  [7] ;  [8] ;  [9] more »;  [1] ;  [2] ;  [2] ;  [2] ;  [2] ;  [1] ;  [7] ;  [7] ;  [2] ;  [3] ;  [1] ;  [4] ;  [2] « less
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  4. GSI Helmholtzzentrum fur Schwerionenforschung GmbH (Germany)
  5. Johannes Gutenberg-Universitat Mainz (Germany)
  6. GSI Helmholtzzentrum fur Schwerionenforschung GmbH (Germany); Johannes Gutenberg-Universitat Mainz (Germany); Helmholtz Institute Mainz (Germany)
  7. Lund Univ. (Sweden)
  8. GSI Helmholtzzentrum fur Schwerionenforschung GmbH (Germany); Helmholtz Institute Mainz (Germany)
  9. Oregon State Univ., Corvallis, OR (United States)
Publication Date:
Report Number(s):
LLNL-JRNL-737626
Journal ID: ISSN 0556-2813; PRVCAN
Grant/Contract Number:
AC52-07NA27344; AC02-05CH11231; FG06-97ER41026
Type:
Accepted Manuscript
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 92; Journal Issue: 2; Journal ID: ISSN 0556-2813
Publisher:
American Physical Society (APS)
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
OSTI Identifier:
1393336
Alternate Identifier(s):
OSTI ID: 1208207

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., and Nitsche, H.. Decay spectroscopy of element 115 daughters: Rg280→Mt276 and Mt276→Bh272. United States: N. p., Web. doi:10.1103/PhysRevC.92.021301.
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.. Decay spectroscopy of element 115 daughters: Rg280→Mt276 and Mt276→Bh272. United States. doi:10.1103/PhysRevC.92.021301.
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., and Nitsche, H.. 2015. "Decay spectroscopy of element 115 daughters: Rg280→Mt276 and Mt276→Bh272". United States. doi:10.1103/PhysRevC.92.021301. https://www.osti.gov/servlets/purl/1393336.
@article{osti_1393336,
title = {Decay spectroscopy of element 115 daughters: Rg280→Mt276 and Mt276→Bh272},
author = {Gates, J. M. and Gregorich, K. E. and Gothe, O. R. and Uribe, E. C. and Pang, G. K. and Bleuel, D. L. and Block, M. and Clark, R. M. and Campbell, C. M. and Crawford, H. L. and Cromaz, M. and Di Nitto, A. and Düllmann, Ch. E. and Esker, N. E. and Fahlander, C. and Fallon, P. and Farjadi, R. M. and Forsberg, U. and Khuyagbaatar, J. and Loveland, W. and Macchiavelli, A. O. and May, E. M. and Mudder, P. R. and Olive, D. T. and Rice, A. C. and Rissanen, J. and Rudolph, D. and Sarmiento, L. G. and Shusterman, J. A. and Stoyer, M. A. and Wiens, A. and Yakushev, A. and Nitsche, H.},
abstractNote = {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.},
doi = {10.1103/PhysRevC.92.021301},
journal = {Physical Review. C, Nuclear Physics},
number = 2,
volume = 92,
place = {United States},
year = {2015},
month = {8}
}