On some unsettled half-lives of AMS radionuclides

Walter Kutschera; Rugard Dressler; Johannes Lachner; Martin Martschini; Michael Paul; Dorothea Schumann; Peter Steier; Christof Vockenhuber; Anton Wallner; Alexander Wieser

doi:10.1016/j.nimb.2025.165802

On some unsettled half-lives of AMS radionuclides

Walter Kutschera^*
, Rugard Dressler
, Johannes Lachner
, Martin Martschini
, Michael Paul
, Dorothea Schumann
, Peter Steier
, Christof Vockenhuber
, Anton Wallner
, Alexander Wieser

^*Corresponding author for this work

Racah Institute of Physics

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

Half-lives ought to be accurate, and preferably precise as well. This contribution discusses cases of long-lived radionuclides used in measurements with accelerator mass spectrometry (AMS), where multiple half-life measurements on specific radionuclides do not agree within the stated uncertainties. This we call “unsettled” half-lives. We include also some cases where only very old half-life measurements (>50 years ago) exist, sometimes only one single measurement. Half-life measurements of the following radionuclides are being discussed: ³²Si, ⁵³Mn, ⁵⁹Ni, ⁷⁹Se, ¹³⁵Cs, ¹⁴⁶Sm, and ²⁰⁹Po. These radionuclides are of interest for a variety of applications with AMS where accurate half-life values would be important.

Original language	English
Article number	165802
Journal	Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume	566
DOIs	https://doi.org/10.1016/j.nimb.2025.165802
State	Published - Sep 2025

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Publisher Copyright:
© 2025

Keywords

AMS radionuclides
Half-life measurements

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10.1016/j.nimb.2025.165802

Cite this

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abstract = "Half-lives ought to be accurate, and preferably precise as well. This contribution discusses cases of long-lived radionuclides used in measurements with accelerator mass spectrometry (AMS), where multiple half-life measurements on specific radionuclides do not agree within the stated uncertainties. This we call “unsettled” half-lives. We include also some cases where only very old half-life measurements (>50 years ago) exist, sometimes only one single measurement. Half-life measurements of the following radionuclides are being discussed: 32Si, 53Mn, 59Ni, 79Se, 135Cs, 146Sm, and 209Po. These radionuclides are of interest for a variety of applications with AMS where accurate half-life values would be important.",

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AU - Lachner, Johannes

AU - Martschini, Martin

AU - Paul, Michael

AU - Schumann, Dorothea

AU - Steier, Peter

AU - Vockenhuber, Christof

AU - Wallner, Anton

AU - Wieser, Alexander

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AB - Half-lives ought to be accurate, and preferably precise as well. This contribution discusses cases of long-lived radionuclides used in measurements with accelerator mass spectrometry (AMS), where multiple half-life measurements on specific radionuclides do not agree within the stated uncertainties. This we call “unsettled” half-lives. We include also some cases where only very old half-life measurements (>50 years ago) exist, sometimes only one single measurement. Half-life measurements of the following radionuclides are being discussed: 32Si, 53Mn, 59Ni, 79Se, 135Cs, 146Sm, and 209Po. These radionuclides are of interest for a variety of applications with AMS where accurate half-life values would be important.

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On some unsettled half-lives of AMS radionuclides

Abstract

Bibliographical note

Keywords

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