We calculate the coherent bremsstrahlung process ν+N→N+ν+γ off a nucleus 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 mν/Eν 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 Eνmν applies only for the initial state.
Neutrino mass from bremsstrahlung endpoint in coherent scattering on nuclei
Vitagliano E.
2018
Abstract
We calculate the coherent bremsstrahlung process ν+N→N+ν+γ off a nucleus 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 mν/Eν 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 Eνmν applies only for the initial state.Pubblicazioni consigliate
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