Speaker
Description
In the current cosmology, neutrinos generated in the early universe of $\sim$1 second old are predicted to remain in the present universe as the cosmic neutrino background($C\nu B$).
While $C\nu B$ can potentially be powerful tool to reveal the history of the universe, it has not been detected so far because its energy, expected to be smaller than 1 eV, is far below the detection threshold of the existing experiments.
Hence, the study of $C\nu B$ requires new thresholdless detection method.
One of the possible method is to use inverse-beta-decay of unstable particles.
In this poster, possibility of using muon as the method using muon is discussed.
In this method, muon absorbs the $C\nu B$ and emits electron or positron with the almost constant energy aroung half of the muon mass.
This method is similar to the existing method using tritium, which is employed in the KATRIN and future PTOLEMY experiment, however, the muon method has possibility to show better performance in some respects.
