SMuK 2023 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 114: Neutrinos V

T 114.2: Vortrag

Donnerstag, 23. März 2023, 16:05–16:20, POT/0051

First ⁷Be Electron Capture Spectrum measured with MMCs — •Arnulf Barth¹, Karl Johnston², Federica Mantegazzini¹, Peter Rubovič³, and Loredana Gastaldo¹ — ¹Kirchhoff-Institute for Physics, Heidelberg University — ²ISOLDE, CERN — ³Institute of Experimental and Applied Physics, Czech Technical University in Prague

⁷Be, with a half-life of about 53 days and a Q-value of about 862 keV is the lightest nuclide to undergo electron capture. In nature, electron capture processes typically occur in atoms within a medium. ⁷Be electrons provide very low screening from environment effects from the host material, causing a change in half-life and other atomic properties. This makes ⁷Be an optimal candidate to study the effect of different host materials on the electron capture process and on the energy transferred to the nuclear recoil. We present the first measurement of the ⁷Be spectrum using low temperature metallic magnetic calorimeters where ⁷Be has been ion-implanted into gold. We achieved a baseline resolution of 4 eV FWHM and could observe the peak corresponding to the capture of the 1s electron, which includes the atomic de-excitation energy and the nuclear recoil energy. These very promising results demonstrate the possibility to perform a detailed study of the effect of the environment on the electron capture process by implanting ⁷Be in different host materials.