Journal
ACTA PHYSICA POLONICA B
Volume 42, Issue 11, Pages 2193-2202Publisher
JAGIELLONIAN UNIV PRESS
DOI: 10.5506/APhysPolB.42.2193
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Funding
- China Postdoctoral Science Foundation [20100480025]
- National Natural Science Foundation of China [10875131]
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Both active and sterile sub-eV neutrinos can serve as hot dark matter (DM). On the other hand, keV sterile neutrinos could be a good candidate for warm DM. The beta-decaying (e.g., H-3 and Ru-106) and EC-decaying (e.g., Ho-163) nuclei are considered as the most promising targets to capture those extremely low energy neutrinos and antineutrinos, respectively. We calculate the capture rates of relic electron neutrinos and antineutrinos against the corresponding beta-decay or EC-decay backgrounds in different flavor mixing schemes. We stress that such direct laboratory measurements of hot or warm DM might not be hopeless in the long term.
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