Cover Image

Measurement of the 229 Th isomer energy with a magnetic microcalorimeter

We present a measurement of the low-energy (0-60 keV) γ-ray spectrum produced in the α decay of 233U using a dedicated cryogenic magnetic microcalorimeter. The energy resolution of ∼10 eV, together with exceptional gain linearity, allows us to determine the energy of the low-lying isomeric state in...

Full description

Saved in:
Bibliographic Details
Main Authors: Sikorsky, Tomas (Author) , Geist, Jeschua (Author) , Hengstler, Daniel (Author) , Kempf, Sebastian (Author) , Gastaldo, Loredana (Author) , Enss, Christian (Author) , Fleischmann, Andreas (Author)
Format: Article (Journal)
Language:English
Published: 28 September 2020
In: Physical review letters
Year: 2020, Volume: 125, Issue: 14
ISSN:1079-7114
DOI:10.1103/PhysRevLett.125.142503
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevLett.125.142503
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.125.142503
Get full text
Author Notes:Tomas Sikorsky, Jeschua Geist, Daniel Hengstler, Sebastian Kempf, Loredana Gastaldo, Christian Enss, Christoph Mokry, Jörg Runke, Christoph E. Düllmann, Peter Wobrauschek, Kjeld Beeks, Veronika Rosecker, Johannes H. Sterba, Georgy Kazakov, Thorsten Schumm, and Andreas Fleischmann
Description
Summary:We present a measurement of the low-energy (0-60 keV) γ-ray spectrum produced in the α decay of 233U using a dedicated cryogenic magnetic microcalorimeter. The energy resolution of ∼10 eV, together with exceptional gain linearity, allows us to determine the energy of the low-lying isomeric state in 229Th using four complementary evaluation schemes. The most precise scheme determines the 229Th isomer energy to be 8.10(17) eV, corresponding to 153.1(32) nm, superseding in precision previous values based on γ spectroscopy, and agreeing with a recent measurement based on internal conversion electrons. We also measure branching ratios of the relevant excited states to be b29=9.3(6)% and b42<0.7%.
Item Description:Im Titel ist die Zahl "229" hochgestellt
Gesehen am 09.12.2020
Physical Description:Online Resource
ISSN:1079-7114
DOI:10.1103/PhysRevLett.125.142503

Similar Items