JAEA-Conf 2011-002 - 日本原子力研究開発機構

JAEA-Conf 2011-002
4. Results and Discussion
The neutron capture cross sections of 93Zr were derived in the energy range from 0.01 eV
to 5 keV as shown in Fig. 1. In the thermal energy region, the present results are close to the
previous value by Nakamura et al.[5]. However, there is an obvious discrepancy between the
values of JENDL-4.0 [19] and the present data. In the keV region, the averaged cross sections
by Macklin [3] are in agreement with the present data. Moreover, the resonance at 14 eV was
newly found.
The neutron capture cross sections of 99Tc were derived in the energy range from 0.01 eV
to 1 keV. The relative cross sections were normalized to the value of JENDL-3.3 at the
thermal energy. The comparison of the present results with the previous data by Kobayashi et
al. [20] and the evaluated data of JENDL-3.3 is shown in Fig. 2. It is found that the signal-tonoise
ratio has been improved remarkably compared with the previous data. The evaluated
values of JENDL-3.3 are almost consistent with the present results.
The neutron capture cross sections of 107Pd were derived in the energy range from 0.1 eV
to 300 eV. The relative cross sections were normalized to the values of JENDL-3.3 at the third
resonance peak. The present results are shown in Fig. 3 together with the thermal neutron
capture cross section by Nakamura et al. [6] and the evaluated values of JENDL-3.3 and 4.0.
In the thermal energy region, the present results support the previous value obtained by the
prompt -ray spectroscopy and indicate that the values of JENDL-3.3 are about five times as
small as the present results. However, the modified values of JENDL-4.0 are consistent with
the present data.
Fig. 1 Preliminary results of neutron capture cross sections of 93Zr.
The previous experimental data by Macklin [3], Nakamura et al.[4] and Pomerance
[7,8] and the evaluated values of JENDL-4.0 [19] are plotted together.