Bulletin of the American Physical Society
5th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Volume 63, Number 12
Tuesday–Saturday, October 23–27, 2018; Waikoloa, Hawaii
Session 2WJB: Surrogate Techniques for Neutron-induced Reactions on Radioactive Nuclei for Fundamental and Applied Nuclear Science II
4:00 PM–5:30 PM,
Tuesday, October 23, 2018
Hilton Room: Kona 5
Chair: Jolie Cizewski, Rutgers Univesity
Abstract ID: BAPS.2018.HAW.2WJB.1
Abstract: 2WJB.00001 : 79Se(d,p)80Se reaction as a surrogate for (n,g) reaction of the long-lived fission product of 79Se*
4:00 PM–4:30 PM
(CNS, Univ. of Tokyo)
(CNS, Univ. of Tokyo)
79Se is one of the long-lived fission products (LLFPs) of the nuclear waste. The half-life is as long as 3.3x105 years. Though the LLFPs are considered to be stored in the deep geological repository, the site has not been determined in the most of countries in the world. Seeking for a way to transmute such nuclei is expected for our descendants. Considering that the mean free path and the cross sections, the neutron induced reactions, such as (n,g) reaction, are promising for the transmutation. 79Se is also important astrophysically because it is located on the path of s-process nucleosynthesis. This nucleus plays as a role of a cosmo chronometer. However the neutron capture reaction on the nucleus has not been experimentally evaluated partly because the selenium is toxic and the 79Se is radioactive.
77,79Se(d,p)78,80Se reactions were measured in inverse kinematics as surrogate reactions of 77,79Se(n,g)78,80Se, respectively. There is the experimental data of 77Se(n,g)78Se at 550 keV. The evaluated cross section of 77Se(n,g)78Se reaction from (d,p) reaction was used to verify the technique.
The experiment was carried out at the new energy degrading beam line name OEDO in RIBF. The 77,79Se beams of about 20 MeV/nucleon were focused by OEDO on a secondary target of 4 mg/cm2 thick CD2 target. The excitation energy of the final state was determined by measuring the scattering angles and the energy of the recoiled proton by 6 telescopes of SSDs and CsI(Tl) placed in the backward angle. The residual nuclei were identified by the spectrometer which enabled us to determine the gamma emission channel without measuring the gamma rays.
In this talk, the detailed experimental setup and the result of the evaluated cross section of 77,79Se(d,p)78,80Se reactions will be presented.
*This work was funded by ImPACT program of Council for Science, Technology, Innovation (Cabinet of office, Government of Japan).
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.HAW.2WJB.1
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