A Possible Detection of the Cosmic Antineutrino Background in the Presence of Flavor Effects

Details A Possible Detection of the Cosmic Antineutrino Background in the Presence of Flavor Effects A Possible Detection of the Cosmic Antineutrino Background in the Presence of Flavor Effects

2011-02-14

arxiv.org/abs/1102.2686v2

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

13 pages, 5 figures, revised version, accepted for publication in Phys. Lett. B

Scientific paper

Lusignoli and Vignati have recently pointed out that it is in principle possible to directly detect the cosmic antineutrino background by using the rather stable isotope holmium-163 as a target, which can decay into dysprosium-163 via electron capture (EC) with a very small energy release. In this paper we calculate the rate of the relic antineutrino capture on holmium-163 nuclei against the corresponding EC decay rate by taking account of different neutrino mass hierarchies and reasonable values of theta_13. We show that such flavor effects are appreciable and even important in some cases, and stress that a calorimetric measurement of the cosmic antineutrino background might be feasible in the far future.

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