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Kumada, Takayuki
no journal, ,
no abstracts in English
Kumada, Takayuki; Takeda, Masayasu
no journal, ,
JRR-3 operation has been substantially suspended since 2010 because the new regulatory requirement was established even for research reactors including JRR-3 after the nuclear accident of Fukushima Dai-ichi Nuclear Power Plant, but JRR-3 will resume operation almost two years later. During the waiting time, we are going to replace in-pile neutron guides that were installed at very near position from the reactor core. The gain factor of neutron intensity of C2 cold neutron guide is estimated to be five combined with replacement of downstream neutron guides. We also present several statistics of JRR-3 usages until 2010 are reported in this presentation.
Kawakita, Yukinobu; Kikuchi, Tatsuya*; Inamura, Yasuhiro; Tahara, Shuta*; Maruyama, Kenji*; Hanashima, Takayasu*; Nakamura, Mitsutaka; Kiyanagi, Ryoji; Yamauchi, Yasuhiro*; Chiba, Kaori*; et al.
no journal, ,
We have developed analysis method to reduce the so-call van Hove function, a time-space correlation function, through the regularization method for coherent quasielastic neutron scattering (QENS) of liquids. In principle, the van Hove function in r-t space can be obtained by double Fourier transform from dynamic structure factor in Q-E space. Instead of a direct function estimation of the van Hove function through the regularization method which easily involves systematical deviation of the calculated dynamic structure factor from the experimental dynamic structure factor, we used a mediation function between them and estimated it through the regularization method. We will discuss with the properties of the mediation function and the obtained van Hove function and the calculated dynamic structure factor with an example of liquid metals with complex static structure such as Bi and Sb whose QENS were measured by AMATERAS spectrometer in J-PARC.