Comprehensive mass measurement study of ${}^{252}$Cf fission fragments with MRTOF-MS and detailed study of masses of neutron-rich Ce isotopes

Sota Kimura; Michiharu Wada; Hiromitsu Haba; Hironobu Ishiyama; Satoshi Ishizawa; Yuta Ito; Toshitaka Niwase; Marco Rosenbusch; Peter Schury; Aiko Takamine

arXiv · 2402.03873

Comprehensive mass measurement study of ${}^{252}$Cf fission fragments with MRTOF-MS and detailed study of masses of neutron-rich Ce isotopes

Sota Kimura·Michiharu Wada·Hiromitsu Haba·Hironobu Ishiyama·Satoshi Ishizawa·Yuta Ito·Toshitaka Niwase·Marco Rosenbusch·Peter Schury·Aiko Takamine

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Abstract

We report the mass measurements of neutron-rich isotopes produced via spontaneous fission of ${}^{252}$Cf using a multi-reflection time-of-flight mass spectrograph. The mass of ${}^{155}$Ce is determined experimentally for the first time. A discrepancy between the experimental and literature values was found for the mass of ${}^{127}$Sb, which was previously deduced through indirect measurements. In comparison with several theoretical predictions, both the values and the trend of the mass excesses of ${}^{152-155}$Ce cannot be consistently explained. The wide-range and simultaneous mass measurements of the multi-reflection time-of-flight mass spectrograph enable us to cross-check the existing mass data, and the conflict between the measured time-of-flight ratio and the extracted mass would imply the necessity of reexamining them.

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Sota Kimura, Michiharu Wada, Hiromitsu Haba, Hironobu Ishiyama, Satoshi Ishizawa, Yuta Ito, Toshitaka Niwase, Marco Rosenbusch, Peter Schury, Aiko Takamine. 2024-02-06. Comprehensive mass measurement study of ${}^{252}$Cf fission fragments with MRTOF-MS and detailed study of masses of neutron-rich Ce isotopes. https://arxiv.org/abs/2402.03873

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