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Report No.

Measurement of ($$gamma$$,$$n$$) cross sections of Se isotopes using laser-Compton scattering $$gamma$$-rays

Kitatani, Fumito  ; Harada, Hideo   ; Goko, Shinji*; Utsunomiya, Hiroaki*; Akimune, Hidetoshi*; Toyokawa, Hiroyuki*; Yamada, Kawakatsu*

The photo-nuclear cross section of Se isotopes ($$^{80}$$Se, $$^{78}$$Se, $$^{77}$$Se, $$^{76}$$Se) were measured with laser-Compton scattering (LCS) $$gamma$$-rays to supply fundamental data for the estimation of the inverse reaction cross sections, i.e., the $$^{79}$$Se($$n$$,$$gamma$$) $$^{80}$$Se cross section. An enriched Se isotope samples were irradiated with LCS $$gamma$$-rays whose maximum energy was varied from each near neutron separation energy to 16.0 MeV. The energy distributions of LCS $$gamma$$-rays were precisely determined using a high-resolution high-energy photon spectrometer (HHS). Emitted neutrons were detected by a high efficiency 4$$pi$$-$$^{3}$$He detector. The excitation function of the photo-nuclear cross section of Se isotopes were determined for the energy range form each near neutron separation energy to near 16.0 MeV. The energy point corresponding to each cross section was deduced using the accurately determined energy distribution of LCS $$gamma$$-rays.



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Category:Physics, Multidisciplinary



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