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A Facility for measurements of (n,$$gamma$$) cross-sections of a nucleus in the range 0.008 $$leq$$ $$E_{rm n}$$ $$<$$ 20 MeV

Segawa, Mariko   ; Toh, Yosuke   ; Harada, Hideo   ; Kitatani, Fumito  ; Koizumi, Mitsuo ; Hatsukawa, Yuichi; Fukahori, Tokio  ; Matsue, Hideaki ; Oshima, Masumi; Tanimura, Yoshihiko   ; Tsutsumi, Masahiro; Nagai, Yasuki*

A new measurement system to determine the neutron-capture cross section of a nucleus at 0.008 $$leq$$ $$E_{rm n}$$ $$<$$ 20 MeV has been installed at the 4 MV Pelletron accelerator laboratory at the facility of radiation standards at Japan Atomic Energy Agency. Pulsed neutrons are produced by bombarding a pulsed proton beam on $$^{7}$$Li (or $$^{2}$$H) or a deuteron beam on $$^{3}$$H. The performance of the new system was studied by measuring discrete $$gamma$$ rays from neutron capture by $$^{206}$$Pb and $$^{207}$$Pb to their low-lying states at several resonances at 10 $$leq$$ $$E_{rm n}$$ $$leq$$ 110 keV using neutrons from $$^{7}$$Li(p,n)$$^{7}$$Be. The $$gamma$$ rays were detected with a good signal-to-noise ratio by means of a highly sensitive anti-Compton NaI(Tl) spectrometer combined with a time-of-flight method. The present study demonstrated good sensitivity of the new system to determine the neutron-capture cross section of a nucleus at keV neutron energy.

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