Superheavy research program at RIKEN: GARIS-III setup latest development and experimental results

ORAL

Abstract

The superheavy program at RIKEN is currently focused on the search and synthesis of the element Z = 119 using the GARIS-III separator, combined with the SRILAC accelerator. This search is performed using the fusion evaporation reaction of 51-Vanadium on the 248-Cm target. The selection of the beam energy was based on the barrier distribution experiment performed by M. Tanaka from which the side collision energy was extracted.

During the search of the new element Z = 119, the GARIS-III setup also initiated its transition to a digital electronics solution using the PIXIE-16 modules. The implementation of this solution and the overall improvement of the performance and preliminary results will be presented in this talk. The reduction of the overall deadtime of the setup and a preliminary analysis of the pulse shape will be detailed.

Recently, we also started to use a lighter surrogate reaction to study the effect of the side collision configuration based on a target with a similar deformation to 248-Curium using the 51-Vanadium beam. The main goal was to extend the systematic studies of 51-Vanadium reactions and side collision effects on deformed targets. The first measurement was performed using a 159-Terbium target and has produced both the barrier distribution and a precise excitation function.

*ORNL researchers were supported by the U.S. DOE Office of Nuclear Physics under DOE Contract No. DE-AC05-00OR22725 with UT Battelle, LLC. U.S. Department of Energy, Office of Science, Office of Nuclear Physics under Contract DE-FG02-96ER40983 (UTK) National Nuclear Security Administration under the Stewardship Science Academic Alliances program Award No. DE-NA0003899.

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Publication: Brionnet, Pierre, et al. "Development of digital electronics for the search of SHE nuclei using GARIS-II/III at RIKEN." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 1049 (2023): 168068.

Brionnet, Pierre et al. "Reaction parameter studies of the 51V beam onto deformed target: 51V+159Tb reaction" to be submitted

Presenters

  • pierre Brionnet

    • RIKEN Nishina Center

Authors

  • pierre Brionnet

    • RIKEN Nishina Center