Bulletin of the American Physical Society
6th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Sunday–Friday, November 26–December 1 2023; Hawaii, the Big Island
Session E02: Applications of Nuclear Physics II
7:00 PM–9:30 PM,
Wednesday, November 29, 2023
Hilton Waikoloa Village
Room: Kona 1
Chair: Lee Bernstein, University of California, Berkeley
Abstract: E02.00004 : Extraction and trapping of 229mTh ions for measuring nuclear-decay half-lives of various ionic species of 229mTh and observing electronic bridge process
7:45 PM–8:00 PM
Presenter:
Yudai Shigekawa
(RIKEN Nishina Center)
Authors:
Yudai Shigekawa
(RIKEN Nishina Center)
Atsushi Yamaguchi
(RIKEN)
Katsuyuki Tokoi
(Osaka University)
Nozomi Sato
(RIKEN Nishina Center)
Michiharu Wada
(KEK)
Hiromitsu Haba
(RIKEN Nishina center)
We developed an extraction and trapping apparatus for 229mTh ions. 229mTh2+,3+ ions emitted from a 233U source are extracted by a radiofrequency-carpet gas cell into an ion trap, where 229mTh+ and molecular 229mTh ions are produced by chemical reactions with reactive gases. The produced ions are then extracted, mass-separated, and placed on a multichannel plate (MCP) detector. The half-lives of 229mTh can be determined from the number of trapped 229mTh (the number of IC electrons measured by the MCP detector) as a function of the trapping time.
We successfully extracted 229Th3+,2+ and observed the IC electrons emitted from 229mTh neutralized on a MCP detector. Moreover, we were able to produce 229Th+ and 229ThO2+ by the reaction with impurities in Ar gas. We will soon try to measure the half-lives of these 229mTh species.
[1] L. von der Wense et al., Nature 533, 47 (2016).
[2] S. Kraemer et al, Nature 617, 706 (2023).
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