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Report No.
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Measurement of $$^{76}$$Se and $$^{78}$$Se ($$gamma$$, n) cross sections

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

The ($$gamma$$, n) cross section of Se isotopes ($$^{76}$$Se, $$^{78}$$Se) were measured to supply fundamental data for the estimating inverse reaction cross section, i.e., the $$^{79}$$Se(n, $$gamma$$) $$^{80}$$Se cross section. The enriched samples and a reference $$^{197}$$Au sample were irradiated with laser-Compton scattering (LCS) $$gamma$$-rays. The excitation function of each ($$gamma$$, n) cross section was determined for the energy range from each near neutron separation energy to the threshold energy of ($$gamma$$, 2n) reaction. The energy point corresponding to each cross section was deduced using the accurately determined energy distribution of LCS $$gamma$$-rays. Systematic ($$gamma$$, n) cross sections for Se isotopes including $$^{80}$$Se were compared with those calculated by using a statistical model calculation code TALYS.

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