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Report No.

Photonuclear reaction cross section of $$^{152}$$Sm

Hara, Kaoru; Harada, Hideo   ; Kitatani, Fumito  ; Goko, Shinji*; Hohara, Shinya*; Kaihori, Takeshi*; Makinaga, Ayano*; Utsunomiya, Hiroaki*; Toyokawa, Hiroyuki*; Yamada, Kawakatsu*; Watanabe, Yukinobu*

Neutron capture cross sections of the unstable nuclei $$^{151}$$Sm (t$$_{1/2}$$=90yr) are the fundamental data for the nuclear transmutation, since the $$^{151}$$Sm is one of radioactive fission products in the nuclear waste. On the other hand, the branching point nucleus $$^{151}$$Sm is important for characterizing the slow neutron capture process (s-process) nucleosynthesis in the AGB stars. The cross sections of the inverse $$^{152}$$Sm($$gamma$$,n)$$^{151}$$Sm reaction were measured with the laser-Compton scattering (LCS) $$gamma$$ rays at 8.3-12.4 MeV. Quasi-monochromatic beams of LCS photons irradiated an enriched $$^{152}$$Sm$$_2$$O$$_3$$ sample. The emitted neutrons were detected with a 4$$pi$$ neutron detector consisting of 20 $$^{3}$$He proportional counters embedded in a polyethylene moderator. The $$^{197}$$Au($$gamma$$,n) reaction cross sections were also measured as a standard. In the data analysis, the ($$gamma$$,n) cross sections are deduced with two methods. The present data for $$^{152}$$Sm and $$^{197}$$Au are compared with the previous data compiled in the IAEA document and the calculation with a nuclear reaction code TALYS. The neutron capture cross sections for $$^{151}$$Sm in the keV-MeV energy range are evaluated with the present photonuclear data for $$^{152}$$Sm as constraint in the statistical model calculations.



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