= The KDK experiment by KDK collaboration (2021)
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{title2=2021}
TIPP 2021 presentation: https://indico.cern.ch/event/981823/contributions/4295324/attachments/2250469/3818551/KDK_TIPP_2021_pub.pdf
Its <potassium-40> decay scheme gives the approximate atomic mass-energy differences of $1.311$ MeV to <calcium-40> and $1.505$ MeV to <argon-40>, and distinguishes capture to an excited argon level from the rare positron branch. The positron kinetic-energy endpoint additionally subtracts $2m_e$ from the atomic mass difference.
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