https://doi.org/10.1140/epjc/s10052-021-09556-0
Regular Article - Theoretical Physics
Novel CSL bounds from the noise-induced radiation emission from atoms
1
Istituto Nazionale di Fisica Nucleare, Trieste Section, Via Valerio 2, 34127, Trieste, Italy
2
Centro Ricerche Enrico Fermi - Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi”, Piazza del Viminale 1, 00184, Rome, Italy
3
INFN, Laboratori Nazionali di Frascati, Via Enrico Fermi 54, 00044, Frascati, Italy
4
Physik Department E62, Technische Universität München, James-Franck-Straße 1, 85748, Garching bei München, Germany
5
INFN, Laboratori Nazionali del Gran Sasso, Via G. Acitelli 22, 67100, Assergi, Italy
6
Department of Physics, University of Trieste, Strada Costiera 11, 34151, Trieste, Italy
d
catalina.curceanu@lnf.infn.it
Received:
22
May
2021
Accepted:
15
August
2021
Published online:
28
August
2021
We study spontaneous radiation emission from matter, as predicted by the Continuous Spontaneous Localization (CSL) collapse model. We show that, in an appropriate range of energies of the emitted radiation, the largest contribution comes from the atomic nuclei. Specifically, we show that in the energy range 
keV the contribution to the radiation emission from the atomic nuclei grows quadratically with the atomic number of the atom, overtaking the contribution from the electrons, which grows only linearly. This theoretical prediction is then compared with the data from a dedicated experiment performed at the extremely low background environment of the Gran Sasso underground National Laboratory, where the radiation emitted form a sample of Germanium was measured.As a result, we obtain the strongest bounds on the CSL parameters for 
m, improving the previous ones by more than an order of magnitude.
© The Author(s) 2021
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