[2E10-16] ImPACT 1 (Experimental Study)

[2E11] Reduction and Resource Recycling of High-level Radioactive Wastes through Nuclear Transmutation

(4-2) Evaluation of ⁷⁹Se(n,g) reaction cross sections via a surrogate reaction

*Nobuaki Imai¹, Masanori Dozono¹, Shin’Ichiro Michimasa¹, Hideaki Otsu², Keita Nakano³, Susumu Shimoura¹ (1. CNS, Univ. of Tokyo, 2. RIKEN Nishina Center, 3. AEES, Kyushu Univ.)

Keywords:nuclear data, nuclear reaction with the radioactive isotope beams, long-lived fission products

Surrogate reactions of ^77,79Se(d,p) were measured in inverse kinematics to evaluate the neutron capture reaction on one of the long-lived fission products of ⁷⁹Se at OEDO beam line in RIBF. The gamma emission probability from the unbound highly excited states of ^78,80Se by using a new technique were measured model-indepently. The gamma emission probabilities with the theoretical compound nucleus formation cross section reproduces the cross section of ⁷⁷Se(n,g) which was directly measured. The neutron capture cross sections on ^77,79Se were evaluated experimentally for the first time, which are in good agreement with current compilation data. In this talk, the detailed experimental setup as well as the resultant cross sections will be given.