arXiv Open Access 2020

Measurement of the $^{229}$Th isomer energy with a magnetic micro-calorimeter

Tomas Sikorsky Jeschua Geist Daniel Hengstler Sebastian Kempf Loredana Gastaldo +11 lainnya

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Abstrak

We present a measurement of the low-energy (0--60$\,$keV) $γ$ ray spectrum produced in the $α$-decay of $^{233}$U using a dedicated cryogenic magnetic micro-calorimeter. The energy resolution of $\sim$$10\,$eV, together with exceptional gain linearity, allow us to measure the energy of the low-lying isomeric state in $^{229}$Th using four complementary evaluation schemes. The most accurate scheme determines the $^{229}$Th isomer energy to be $8.10(17)\,$eV, corresponding to 153.1(37)$\,$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 $b_{29}=9.3(6)\%$ and $b_{42}=0.3(3)\%$.

Topik & Kata Kunci

nucl-ex nucl-th physics.ins-det

Penulis (16)

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

Andreas Fleischmann

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Sikorsky, T., Geist, J., Hengstler, D., Kempf, S., Gastaldo, L., Enss, C. et al. (2020). Measurement of the $^{229}$Th isomer energy with a magnetic micro-calorimeter. https://arxiv.org/abs/2005.13340

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Tahun Terbit: 2020
Bahasa: en
Sumber Database: arXiv
Akses: Open Access ✓