Spectroscopy of element 115 decay chains

Journal Article · Tue Jan 01 00:00:00 EST 2013 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.111.112502· OSTI ID:1095153

Rudolph, Dirk ^[1]; Forsberg, U. ^[1]; Golubev, P. ^[1]; Sarmiento, L. G. ^[1]; Yakushev, A. ^[2]; Andersson, L. -L. ^[3]; Di Nitto, A. ^[3]; Duehllmann, Ch. E. ^[2]; Gates, J. M. ^[4]; Gregorich, K. E. ^[4]; Gross, Carl J ^[5]; Hessberger, F. P. ^[2]; Herzberg, R. -D ^[6]; Khuyagbaatar, J. ^[3]; Kratz, J. V. ^[3]; Rykaczewski, Krzysztof Piotr ^[5]; Schaedel, M. ^[2]; Aberg, S. ^[1]; Ackermann, D. ^[7]; Block, M. ^[2] ; Brand, H. ^[2]; Carlsson, B. G. ^[1]; Cox, D. ^[6]; Derkx, X. ^[3]; Eberhardt, K. ^[3]; Even, J. ^[3]; Fahlander, C. ^[1]; Gerl, J. ^[2]; Jaeger, E. ^[2]; Kindler, B. ^[2]; Krier, J. ^[2]; Kojouharov, I. ^[2]; Kurz, N. ^[2]; Lommel, B. ^[2]; Mistry, A. ^[6]; Mokry, C. ^[3]; Nitsche, H. ^[4]; Omtvedt, J. P. ^[8]; Papadakis, P. ^[6]; Ragnarsson, I. ^[1]; Runke, J. ^[2]; Schaffner, H. ^[2]; Schausten, B. ^[2]; Thoerle-Pospiech, P. ^[3]; Torres, T. ^[2]; Traut, T. ^[3]; Trautmann, N. ^[3]; Tuerler, A. ^[8]; Ward, A. ^[6]; Ward, D. E. ^[1]; Wiehl, N. ^[3]

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1. Lund University, Sweden
2. Gesellschaft fur Schwerionenforschung (GSI), Germany
3. Johannes Gutenberg-Universitaet Mainz, Mainz, Germany
4. Lawrence Berkeley National Laboratory (LBNL)
5. ORNL
6. University of Liverpool
7. GSI-Hemholtzzentrum fur Schwerionenforschung, Darmstadt, Germany
8. Paul Scherrer Institut, Villigen, Switzerland

A high-resolution a, X-ray and -ray coincidence spectroscopy experiment was conducted at the GSI Helmholtzzentrum fu r Schwerionenforschung. Thirty correlated a-decay chains were detected following the fusion-evaporation reaction 48Ca + 243Am. The observations are consistent with previous assignments of similar decay chains to originate from element Z = 115. The data includes first candidates of fingerprinting the decay step Mt --> Bh with characteristic X rays. For the first time, precise spectroscopy allows the derivation of excitation schemes of isotopes along the decay chains starting with elements Z > 112. Comprehensive Monte-Carlo simulations accompany the data analysis. Nuclear structure models provide a first level interpretation.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1095153
• Journal Information: Physical Review Letters, Vol. 111, Issue 11; ISSN 0031--9007
• Country of Publication: United States
• Language: English