Difficulties in using the sharp neutrino spectrum at short times

TL;DR

This paper discusses the challenge of utilizing the sharp neutrino spectrum at short times due to broadening effects, which hinder the use of resonance absorption for neutrino detection.

Contribution

It highlights the fundamental difficulty in exploiting the resonance peak for neutrino detection at short times caused by decay-induced spectral broadening.

Findings

Resonance absorption cross section is less effective at short times.

Decay broadening prevents the use of natural line width for detection.

High resonance cross section is not practically usable at early times.

Abstract

Final states produced by a decay have a much broader energy spectrum than the natural line width at times much shorter than the decay lifetime. This tends to render impossible the use for neutrino detection of the high value of the resonance absorption cross section at the peak of the resonance.