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Journal Articles

Neutron capture cross section and capture $$gamma$$-ray spectra of $$^{138}$$Ba in the keV-neutron energy region

Katabuchi, Tatsuya*; Yanagida, Shotaro*; Terada, Kazushi; Iwamoto, Nobuyuki; Igashira, Masayuki*

EPJ Web of Conferences (Internet), 93, p.02008_1 - 02008_2, 2015/05


$$^{138}$$Ba has the smallest neutron capture cross section among the stable Ba isotopes. The neutron capture reaction of $$^{138}$$Ba is dominated by resolved resonances in the astrophysically relevant energy region. Thus, reliable experimental data of the capture cross section are necessary. In the present work, we measured the neutron capture cross section of $$^{138}$$Ba in the energy region from 15 to 100 keV by the time-of-flight method at the Tokyo Institute of Technology. The capture cross sections were obtained from the pulse height spectra by the pulse-height weighting technique. A comparison of the present results with previous experimental data and evaluated data was made. We also derived $$gamma$$-ray spectra by unfolding the pulse height spectra. It was revealed that the shape of $$gamma$$-ray spectra strongly depends on neutron energy.

Oral presentation

Evaluation of neutron nuclear data on Ba isotopes

Iwamoto, Nobuyuki; Yanagida, Shotaro*

no journal, , 

Evaluation of neutron nuclear data on Ba isotopes has not been performed since the early 1990s. Natural barium has seven isotopes and the most abundant one is $$^{138}$$Ba (71.698%). In viewpoint of nuclear medicine $$gamma$$-ray with 250 keV is emitted from the $$beta$$ decay of $$^{135}$$Xe and is likely to be used to nuclear imaging. Four radioisotopes with half-life longer than 30 days are generated by reactions with neutrons with energies smaller than 20 MeV. It is important to revise nuclear data on Ba isotopes using the latest experimental data in order to evaluate their radioactivities with good accuracy. In this study I carried out the evaluation of cross sections up to incident neutron energy of 20 MeV. As a result, the present result improves the underestimation of $$^{138}$$Ba($$n,alpha$$)$$^{135}$$Xe reaction cross section. $$gamma$$-ray production cross sections which were not included in JENDL-4.0, are calculated and are in good agreement with experimental data.

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