21-29 July 2022
US/Pacific timezone

Nuclide production cross sections in proton-induced reactions on Bi at GeV energies

28 Jul 2022, 12:06
Folsom ()



Hiroki Iwamoto


An accelerator-driven transmutation system (ADS) is a potential candidate for treating high-level radioactive waste generated from nuclear power plants. For predicting the radioactivity of the components of ADS and assessing impurity behavior in lead-bismuth eutectic (LBE), nuclide production cross sections play a vital role. So far, we have measured 7 nuclide production cross sections in the proton-induced spallation reactions on Bi [1] at 0.4 and 3.0 GeV. In this work, a new measurement of nuclide production cross sections on Bi has been conducted at the reaction energies of 0.4, 1.5, and 3.0 GeV, aiming to measure more various nuclide production, especially Po isotopes by increasing the statistics. A high-intensity proton beam and beam monitoring system enables us to measure the nuclear data with higher accuracy. The theoretical models are employed to calculate the cross sections, and the reproducibility is investigated.

The experiment was performed at J-PARC. The proton beams accelerated at 0.4, 1.5, and 3.0 GeV impinged onto the 0.25-mm thick Bi target foils. The number of irradiated protons was estimated by using an integrating current transformer. After the irradiation, gamma-rays emitted from the produced nuclei were measured using HPGe detectors for three months. The nuclide production cross sections were derived from the obtained decay curves.

We successfully obtained 114 cross sections, including $^{97}$Ru production cross sections, which have never been measured so far. The measured data were compared with the calculations by combining INCL4.6 [2] and GEM [3] implemented in PHITS [4] and by combining INCL++ [5] and ABLA07 [6] models. Also, a comparison with nuclear data library JENDL/HE-2007 [7] was performed. The details of the results will be discussed in the presentation.

[1] H. Matsuda et al., EPJ Web of Conf. 239, 06004 (2020).
[2] A. Boudard et al., Phys. Rev. C 87, 014606 (2013).
[3] S. Furihata, Nucl. Instrum. Meth. B 171, 251 (2000).
[4] T. Sato et al., J. Nucl. Sci. Technol. 55, 529 (2018).
[5] D. Mancusi et al., Phys. Rev. C 90, 054602 (2014).
[6] A. Kelic et al., arXiv:0906.4193 (2009).
[7] Y. Watanabe et al., J. Korean Phys. Soc. 59, 1040 (2011).

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