Development of an “α-TOF” detector for correlated measurement of atomic masses and decay properties

T. Niwase, M. Wada, P. Schury, H. Haba, S. Ishizawa, Y. Ito, D. Kaji, S. Kimura, H. Miyatake, K. Morimoto, K. Morita, M. Rosenbusch, H. Wollnik, T. Shanley, Y. Benari

Research output: Contribution to journalArticle

Abstract

We have developed a novel detector, referred to as an “α-TOF detector”, for correlated measurements of atomic masses and decay properties of low-yield, short-lived radioactive isotopes using a multi-reflection time-of-flight mass spectrograph. By correlating measured time-of-flight signals with decay events, it will be possible to suppress background events and obtain accurate, high-precision mass and half-life values even in cases of very low event rates. An offline test of the α-TOF detector has shown that the time-of-flight detection efficiency for 5.48 MeV α-rays is more than 90% and yields a time resolution of 250.6(68) ps and an alpha-energy resolution of 141.1(9) keV. Using a two-dimensional spectrum of the correlated α-ray energy and time-of-flight, the α-rays from mixed α sources could be resolved. Subsequent testing using α-emitting nuclei extracted offline from a gas cell provide verification of the α-ray based characterization.

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atomic weights
rays
Detectors
detectors
decay
Spectrographs
Radioisotopes
half life
radioactive isotopes
spectrographs
Testing
Gases
nuclei
energy
cells
gases

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Instrumentation

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Development of an “α-TOF” detector for correlated measurement of atomic masses and decay properties. / Niwase, T.; Wada, M.; Schury, P.; Haba, H.; Ishizawa, S.; Ito, Y.; Kaji, D.; Kimura, S.; Miyatake, H.; Morimoto, K.; Morita, K.; Rosenbusch, M.; Wollnik, H.; Shanley, T.; Benari, Y.

In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 953, 163198, 11.02.2020.

Research output: Contribution to journalArticle

Niwase, T. ; Wada, M. ; Schury, P. ; Haba, H. ; Ishizawa, S. ; Ito, Y. ; Kaji, D. ; Kimura, S. ; Miyatake, H. ; Morimoto, K. ; Morita, K. ; Rosenbusch, M. ; Wollnik, H. ; Shanley, T. ; Benari, Y. / Development of an “α-TOF” detector for correlated measurement of atomic masses and decay properties. In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 2020 ; Vol. 953.
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AU - Niwase, T.

AU - Wada, M.

AU - Schury, P.

AU - Haba, H.

AU - Ishizawa, S.

AU - Ito, Y.

AU - Kaji, D.

AU - Kimura, S.

AU - Miyatake, H.

AU - Morimoto, K.

AU - Morita, K.

AU - Rosenbusch, M.

AU - Wollnik, H.

AU - Shanley, T.

AU - Benari, Y.

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AB - We have developed a novel detector, referred to as an “α-TOF detector”, for correlated measurements of atomic masses and decay properties of low-yield, short-lived radioactive isotopes using a multi-reflection time-of-flight mass spectrograph. By correlating measured time-of-flight signals with decay events, it will be possible to suppress background events and obtain accurate, high-precision mass and half-life values even in cases of very low event rates. An offline test of the α-TOF detector has shown that the time-of-flight detection efficiency for 5.48 MeV α-rays is more than 90% and yields a time resolution of 250.6(68) ps and an alpha-energy resolution of 141.1(9) keV. Using a two-dimensional spectrum of the correlated α-ray energy and time-of-flight, the α-rays from mixed α sources could be resolved. Subsequent testing using α-emitting nuclei extracted offline from a gas cell provide verification of the α-ray based characterization.

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