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#### Neutrino mass from bremsstrahlung endpoint in coherent scattering on nuclei

##### MPS-Authors

Millar,  Alexander
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Raffelt,  Georg
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Stodolsky,  Leo
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Vitagliano,  Edoardo
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

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##### Citation

Millar, A., Raffelt, G., Stodolsky, L., & Vitagliano, E. (2018). Neutrino mass from bremsstrahlung endpoint in coherent scattering on nuclei. Physical Review D, (98), 123006. Retrieved from https://publications.mppmu.mpg.de/?action=search&mpi=MPP-2018-245.

Cite as: https://hdl.handle.net/21.11116/0000-0003-F893-F
##### Abstract
We calculate the coherent bremsstrahlung process $ν+{\cal N} \to {\cal N}+ν+γ$ off a nucleus ${\cal N}$ with the aim of revealing the neutrino mass via the photon endpoint spectrum. Unfortunately, the large required power of a monochromatic neutrino source and/or large detector mass make it difficult to compete with traditional electron-spectrum endpoint measurements in nuclear $β$ decay. Our neutral-current process distinguishes between Dirac and Majorana neutrinos, but the change of the photon spectrum is of the order of $m_ν/E_ν$ and thus very small, despite the final-state neutrino coming to rest at the photon endpoint. So the "Dirac-Majorana confusion theorem" remains intact even if $E_ν\gg m_ν$ applies only for the initial state.