Experiments on the synthesis of superheavy nuclei Fl284 and Fl285 in the Pu239,240+Ca48 reactions

Utyonkov, Vladimir K.; Brewer, Nathan T.; Oganessian, Yuri Ts.; Rykaczewski, Krzysztof P.; Abdullin, F. Sh.; Dmitriev, S. N.; Grzywacz, Robert Kazimierz; Itkis, M. G.; Miernik, Krzysztof; Polyakov, A. N.; Roberto, James B.; Sagaidak, R. N.; Shirokovsky, I. V.; Shumeiko, M. V.; Tsyganov, Yu. S.; Voinov, A. A.; Subbotin, V. G.; Sukhov, A. M.; Sabel'nikov, A. V.; Vostokin, G. K.; Hamilton, J. H.; Stoyer, M. A.; Strauss, S. Y.

doi:10.1103/PhysRevC.92.034609

Title: Experiments on the synthesis of superheavy nuclei ${}^{284}{Fl}$ and ${}^{285}{Fl}$ in the ${}^{239, 240}{Pu} + {}^{48}{Ca}$ reactions

Journal Article · 14 September 2015 · Physical Review C, Nuclear Physics

DOI: https://doi.org/10.1103/PhysRevC.92.034609 · OSTI ID:1493143

Utyonkov, Vladimir K. ^[1]; Brewer, Nathan T. ^[2]; Oganessian, Yuri Ts. ^[1];

^[2]; Abdullin, F. Sh. ^[1]; Dmitriev, S. N. ^[1];

^[3]; Itkis, M. G. ^[1]; Miernik, Krzysztof ^[4]; Polyakov, A. N. ^[1];

^[2]; Sagaidak, R. N. ^[1]; Shirokovsky, I. V. ^[1]; Shumeiko, M. V. ^[1]; Tsyganov, Yu. S. ^[1]; Voinov, A. A. ^[1]; Subbotin, V. G. ^[1]; Sukhov, A. M. ^[1]; Sabel'nikov, A. V. ^[1]; Vostokin, G. K. ^[1] more »

Flerov Lab of Nuclear Reactions, Dubna (Russian Federation)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Warsaw, Warsaw (Poland)
Vanderbilt Univ., Nashville, TN (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Univ. of Notre Dame, Notre Dame, IN (United States)

Irradiations of ²³⁹Pu and ²⁴⁰Pu targets with 48Ca beams aimed at the synthesis of Z=114 flerovium isotopes were performed at the Dubna Gas Filled Recoil Separator. A new spontaneously fissioning (SF) isotope ²⁸⁴Fl was produced for the first time in the ²⁴⁰Pu+⁴⁸Ca (250 MeV) and ²³⁹Pu+⁴⁸Ca (245 MeV) reactions. The cross section of the ²³⁹Pu(⁴⁸Ca,3n)²⁸⁴Fl reaction channel was about 20 times lower than predicted by theoretical models and about 50 times lower than the maximum fusion-evaporation cross section for the 3n and 4n channels measured in the ²⁴⁴Pu+⁴⁸Ca reaction. In the ²⁴⁰Pu+⁴⁸Ca experiment, performed at 245 MeV in order to maximize the 3n-evaporation channel, three decay chains of ²⁸⁵Fl were detected. The α-decay energy of ²⁸⁵Fl was measured for the first time and decay properties of its descendants ²⁸¹Cn, ²⁷⁷Ds, ²⁷³Hs, ²⁶⁹Sg, and ²⁶⁵Rf were determined with higher accuracy. The assignment of SF events observed during the irradiation of the ²⁴⁰Pu target with a 250 MeV ⁴⁸Ca beam to ²⁸⁴Fl decay is presented and discussed. The cross sections at both ⁴⁸Ca energies are similar and exceed that observed in the reaction with the lighter isotope ²³⁹Pu by a factor of 10. In conclusion, the decay properties of the synthesized nuclei and their production cross sections indicate a rapid decrease of stability of superheavy nuclei as the neutron number decreases from the predicted magic neutron number N = 184.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)

Grant/Contract Number:: AC05-00OR22725; AC52-07NA27344; FG05-88ER40407

OSTI ID:: 1493143

Report Number(s):: LLNL-JRNL-704466

Journal Information:: Physical Review C, Nuclear Physics, Journal Name: Physical Review C, Nuclear Physics Journal Issue: 3 Vol. 92; ISSN 0556-2813; ISSN PRVCAN

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Experiments on the synthesis of superheavy nuclei ${}^{284}{Fl}$ and ${}^{285}{Fl}$ in the ${}^{239, 240}{Pu} + {}^{48}{Ca}$ reactions