Study of Quasielastic Barrier Distributions as a Step towards the Synthesis of Superheavy Elements with Hot Fusion Reactions

Tanaka, T.; Morita, K.; Morimoto, K.; Kaji, D.; Haba, H.; Boll, R.  A.; Brewer, N.  T.; Van Cleve, S.; Dean, D.  J.; Ishizawa, S.; Ito, Y.; Komori, Y.; Nishio, K.; Niwase, T.; Rasco, B.  C.; Roberto, J.  B.; Rykaczewski, K.  P.; Sakai, H.; Stracener, D.  W.; Hagino, K.

doi:10.1103/physrevlett.124.052502

Title: Study of Quasielastic Barrier Distributions as a Step towards the Synthesis of Superheavy Elements with Hot Fusion Reactions

Journal Article · Wed Feb 05 00:00:00 EST 2020 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.124.052502· OSTI ID:1669769

^[1]; Morita, K. ^[2]; Morimoto, K. ^[3]; Kaji, D. ^[3]; Haba, H. ^[3];

^[4];

^[4]; Ishizawa, S. ^[5]; Ito, Y. ^[6]; Komori, Y. ^[3]; Nishio, K. ^[7]; Niwase, T. ^[2];

^[4];

^[3];

^[4]; Hagino, K. ^[8]

RIKEN Nishina Center for Accelerator-Based Science, Saitama (Japan); Kyushu Univ., Fukuoka (Japan); Australian National Univ., Canberra, ACT (Australia)
RIKEN Nishina Center for Accelerator-Based Science, Saitama (Japan); Kyushu Univ., Fukuoka (Japan)
RIKEN Nishina Center for Accelerator-Based Science, Saitama (Japan)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
RIKEN Nishina Center for Accelerator-Based Science, Saitama (Japan); Yamagata Univ. (Japan)
RIKEN Nishina Center for Accelerator-Based Science, Saitama (Japan); Japan Atomic Energy Agency (JAEA), Tokai (Japan). Advanced Science Research Center
Japan Atomic Energy Agency (JAEA), Tokai (Japan). Advanced Science Research Center
Tohoku Univ., Sendai (Japan); Tohoku Univ., Sendai (Japan). Research Center for Electron Photon Science; Kyoto Univ. (Japan)

The excitation functions for quasielastic scattering of ${}_{22}{Ne} + {}_{248}{Cm}$ , ${}_{26}{Mg} + {}_{248}{Cm}$ , and ${}_{48}{Ca} + {}_{238}U$ are measured using a gas-filled recoil ion separator. The quasielastic barrier distributions are extracted for these systems and are compared with coupled-channel calculations. The results indicate that the barrier distribution is affected dominantly by deformation of the actinide target nuclei, but also by vibrational or rotational excitations of the projectile nuclei, as well as neutron transfer processes before capture. From a comparison between the experimental barrier distributions and the evaporation residue cross sections for Sg ( $Z = 106$ ), Hs (108), Cn (112), and Lv (116), it is suggested that the hot fusion reactions take advantage of a compact collision, where the projectile approaches along the short axis of a prolately deformed nucleus. Overall, a new method is proposed to estimate the optimum incident energy to synthesize unknown superheavy nuclei using the barrier distribution.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); Ministry of Education, Culture, Sports, Science and Technology of Japan

Grant/Contract Number:: AC05-00OR22725; 19002005

OSTI ID:: 1669769

Journal Information:: Physical Review Letters, Vol. 124, Issue 5; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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