[3N04-07] Nuclear Data Measurement 2

[3N04] Neutron capture cross-section measurement of lead-204 by mass spectrometry

*Shoji NAKAMURA¹, Atsushi KIMURA¹, Syunsuke ENDO¹, Yuji SHIBAHARA², Toshiyuki SHIZUMA³ (1. JAEA, 2. KURNS, 3. QST)

Keywords:Lead-204, Lead-205, Mass spectrometry, Activation method, JRR-3

In recent years, research has been advanced on lead-cooled fast reactors and accelerator drive systems, and it is required to improve the accuracy of the neutron capture cross section of Pb isotopes. Although ²⁰⁴Pb has a small natural abundance, it is of importance because it produces the long-lived radionuclide ²⁰⁵Pb (17.3 million years) by neutron capture reaction. However, it is difficult to measure its cross section by a conventional activation method using a nuclear reactor because the induced radioactivity of ²⁰⁵Pb is weak. Hence, the cross-section measurement was performed by applying mass spectrometry. This presentation gives the details of the experiment and the results obtained in the neutron capture cross-section measurement of ²⁰⁴Pb using mass spectrometry.