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The $$gamma$$SF method; Determination of radiative neutron-capture cross section for unstable nuclei

Utsunomiya, Hiroaki*; Goriely, S.*; Akimune, Hidetoshi*; Harada, Hideo ; Kitatani, Fumito; Goko, Shinji*; Toyokawa, Hiroyuki*; Yamada, Kawakatsu*; Lui, Y.-W.*

An indirect method of determining radiative neutron-capture cross sections for unstable nuclei which we refer to as the $$gamma$$-ray strength function ($$gamma$$SF) method is outlined and applied to Zr and Sn isotopes. Photoneutron cross sections for $$^{91,92,94,96}$$Zr and $$^{117,116}$$Sn near neutron threshold show the presence of extra $$gamma$$-ray strengths known as giant M1 and pygmy E1 resonances on top of the low-energy $$gamma$$SF of GDR. Based on the $$gamma$$SF method, we present ($$n$$,$$gamma$$) cross sections for two radioactive nuclei, a long-lived fission product, $$^{93}$$Zr with T$$_{1/2}$$=1.5$$times$$10$$^{6}$$ y and an s-process branching point nucleus, $$^{95}$$Zr with T$$_{1/2}$$=64.0 d.

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Category:Physics, Multidisciplinary

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