Precise absolute <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi>γ</mi><mo>–</mo><mi>ray</mi></mrow></math> intensities following the <math xmlns="http://www.w3.org/1998/Math/MathML"><mi>β</mi></math> decay of <math xmlns="http://www.w3.org/1998/Math/MathML"><mmultiscripts><mi>Eu</mi><mprescripts></mprescripts><none></none><mn>156</mn></mmultiscripts></math>

D. E. M. Hoff; K. Kolos; N. D. Scielzo; V. E. Iacob; M. Bencomo; D. Melconian; M. T. Burkey; N. Callahan; J. A. Clark; P. Copp; M. Gott; G. E. Morgan; T. S. Nagel; E. B. Norman; W.-J. Ong; R. Orford; D. Ray; J. Rohrer; D. Santiago-Gonzalez; G. Savard; M. Stoyer; A. Tonchev; L. Varriano; A. A. Valverde; X. Yan

doi:10.1103/wwv8-54hj

Precise absolute $γ - ray$ intensities following the $β$ decay of ${}^{156}{Eu}$

D. E. M. Hoff ¹, K. Kolos ¹, N. D. Scielzo ¹, V. E. Iacob ², M. Bencomo¹, D. Melconian ^2,3, M. T. Burkey ¹, N. Callahan ⁴, J. A. Clark ⁴ et al.

P. Copp ⁴, M. Gott ⁴, G. E. Morgan ^4,5, T. S. Nagel ⁶, E. B. Norman ⁶, W.-J. Ong¹, R. Orford ⁷, D. Ray ⁸, J. Rohrer⁴, D. Santiago-Gonzalez ⁴, G. Savard^4,9, M. Stoyer ¹, A. Tonchev ¹, L. Varriano ^4,9, A. A. Valverde ^4,8, and X. Yan ⁴

¹Lawrence Livermore National Laboratory, Livermore, California 94551, USA
²Cyclotron Institute, Texas A&M University, College Station, Texas 77843, USA
³Department of Physics and Astronomy, Texas A&M University, College Station, Texas 77843, USA
⁴Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
⁵Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
⁶Department of Nuclear Engineering, University of California, Berkeley, California 94720, USA
⁷Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
⁸Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
⁹Department of Physics, University of Chicago, Chicago, Illinois 60637, USA

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Phys. Rev. C 113, 044316 – Published 21 April, 2026

DOI: https://doi.org/10.1103/wwv8-54hj

Abstract

The most recent $β$ -decay data for ${}^{156}{Eu}$ is over 40 years old, and the $γ$ -ray intensities are only known with a fractional precision of about $10 %$ or worse. In this work, we present new results for the absolute intensities of more than 60 $γ$ rays emitted following the $β$ decay of ${}^{156}{Eu}$ with many measured to $≲ 1 %$ accuracy, representing an order-of-magnitude improvement in precision. This was achieved by leveraging the fission-product beams produced at the CARIBU facility to create radio-pure samples and detecting the radiation with a $4 π β$ -particle counter coupled with a precisely efficiency-calibrated HPGe detector at Texas A and M University.

Physical Review C

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Precise absolute $γ - ray$ intensities following the $β$ decay of ${}^{156}{Eu}$

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Precise absolute γ–ray intensities following the β decay of Eu156

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Precise absolute $γ - ray$ intensities following the $β$ decay of ${}^{156}{Eu}$