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  4. Detecting Non-Relativistic Cosmic Neutrinos by Capture on Tritium: Phenomenology and Physics Potential
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Detecting Non-Relativistic Cosmic Neutrinos by Capture on Tritium: Phenomenology and Physics Potential

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Description

We study the physics potential of the detection of the Cosmic Neutrino Back- ground via neutrino capture on tritium, taking the proposed PTOLEMY experiment as a case study. With the projected energy resolution of ∆ ∼ 0.15eV, the experiment will be sensitive to neutrino masses with degenerate spectrum, m1 ≃ m2 ≃ m3 = mν 0.1eV. These neutrinos are non-relativistic today; detecting them would be a unique opportunity to probe this unexplored kinematical regime. The signature of neutrino capture is a peak in the electron spectrum that is displaced by 2mν above the beta decay endpoint. The signal would exceed the background from beta decay if the energy resolution is ∆ 0.7 mν. Interestingly, the total capture rate depends on the origin of the neutrino mass, being ΓD ≃ 4 and ΓM ≃ 8 events per year (for a 100 g tritium target) for unclustered Dirac and Majorana neutrinos, respectively. An enhancement of the rate of up to O(1) is expected due to gravitational clustering, with the unique potential to probe the local overdensity of neutrinos. Turning to more exotic neutrino physics, PTOLEMY could be sensitive to a lepton asymmetry, and reveal the eV-scale sterile neutrino that is favored by short baseline oscillation searches. The experiment would also be sensitive to a neutrino lifetime on the order of the age of the uni- verse and break the degeneracy between neutrino mass and lifetime which affects existing bounds.

Date Created
2014-08-01
Contributors
  • Long, Andrew J. (Author)
  • Lunardini, Cecilia (Author)
  • Sabancilar, Eray (Author)
  • College of Liberal Arts and Sciences (Contributor)
Resource Type
Text
Extent
37 pages
Language
eng
Copyright Statement
In Copyright
Reuse Permissions
Attribution
Primary Member of
ASU Scholarship Showcase
Identifier
Digital object identifier: 10.1088/1475-7516/2014/08/038
Identifier Type
International standard serial number
Identifier Value
1475-7516
Peer-reviewed
No
Open Access
No
Series
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Handle
https://hdl.handle.net/2286/R.I.27987
Preferred Citation

Long, Andrew J., Lunardini, Cecilia, & Sabancilar, Eray (2014). Detecting non-relativistic cosmic neutrinos by capture on tritium: phenomenology and physics potential. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, 08(2014)038. http://dx.doi.org/10.1088/1475-7516/2014/08/038

Level of coding
minimal
Cataloging Standards
asu1
System Created
  • 2015-02-20 04:03:01
System Modified
  • 2021-10-27 01:44:14
  •     
  • 1 year 7 months ago
Additional Formats
  • OAI Dublin Core
  • MODS XML

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