Bulletin of the American Physical Society
6th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Sunday–Friday, November 26–December 1 2023; Hawaii, the Big Island
Session 4WRB: Super Heavy Nuclei and New Elements IIInvited Workshop
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Chair: Krzysztof Piotr Rykaczewski, Oak Ridge National Lab Room: Hilton Waikoloa Village Kona 4 |
Monday, November 27, 2023 4:00PM - 4:30PM |
4WRB.00001: Materials for the Synthesis of Superheavy Nuclei: Recent Developments and Prospects Invited Speaker: James B Roberto Six new superheavy elements with Z=113-118 have been added to the Periodic Table since 2000. Elements 114-118 were discovered using the “hot fusion” technique, bombarding actinide targets with intense 48Ca beams. To date ~50 isotopes of these elements have been observed in more than 300 decay chains. These results have been dependent on the availability of actinide target materials and adequate supplies of enriched 48Ca. Continued progress in the synthesis of superheavy elements and isotopes is critically dependent on the continued availability of rare actinide materials for targets and stable isotope feedstock for the required ion beams. Actinide materials in the required quantities can only be produced and processed at Oak Ridge National Laboratory (ORNL) and in Russia, and U.S. separation capability to provide the needed stable isotopes (such as 48Ca) is limited. |
Monday, November 27, 2023 4:30PM - 5:00PM |
4WRB.00002: Search for a new element 119 Invited Speaker: Hiromitsu Haba Status of the new element search project at RIKEN is presented. In April 2018, we formed the new SHE Research Group (nSHE RG) and started an experiment to synthesize new element 119 in the 248Cm(51V,xn)299-x119 reaction using GAs-filled Recoil Ion Separator II (GARIS-II) at RIKEN Ring Cyclotron. The 248Cm target material was supplied from Oak Ridge National Laboratory. In January 2020, RIKEN heavy-ion Linear ACcelerator (RILAC) was upgraded with the 28-GHz superconducting ECR ion source and the superconducting RILAC (SRILAC). We developed the new separator GARIS-III at SRILAC. An optimal reaction energy in the 248Cm + 51V fusion reaction was deduced from the quasielastic barrier distribution extracted by measuring the excitation function of quasielastic backscattering. Since October 2020, we have continued the synthesis experiment of element 119 with GARIS-III at SRILAC. |
Monday, November 27, 2023 5:00PM - 5:30PM |
4WRB.00003: The Berkeley Lab path to a new element (Z=120) Invited Speaker: Larry W Phair Efforts to synthesize elements beyond oganesson (Z=118) will push the limits of current technology due to the expected low production cross sections (below the 100 femtobarn level) and short half-lives (likely of order a few microseconds) for these elements. The approach to making new elements necessitates using beams other than 48Ca. The ion source group at the 88-Inch Cyclotron has developed a Ti beam, which, combined with a Cf target, could produce a new element, Z=120. The Ti beam was created using both the VENUS and AECR ion sources and new oven technologies. The 88-Inch Cyclotron is planning to host a new element search involving long running periods (many months) of intense beams (~particle μA 50Ti) on actinide targets to approach the theoretical tens of femtobarn production cross sections. An intense 50Ti beam combined with the highly efficient Berkeley Gas-filled Separator (BGS) makes a new element search possible. The BGS has been upgraded with a custom-built focal plane detector system and a new digital electronic readout. We will discuss the Berkeley Lab path to synthesizing a new element (Z=120). |
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