Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1304..401m&link_type=abstract
EXOTIC NUCLEI AND NUCLEAR/PARTICLE ASTROPHYSICS (III): From Nuclei to Stars. AIP Conference Proceedings, Volume 1304, pp. 401-4
Astronomy and Astrophysics
Astrophysics
Beta-Decay, Neutrino Mass, Excited States, Weak-Interaction And Lepton Aspects, Neutrino Mass And Mixing, Potential Energy Surfaces For Excited Electronic States
Scientific paper
Beta decays with low Q values can be utilized in the quest to determine the neutrino mass scale. This is being realized in two experiments, KATRIN and MARE, using tritium and 187Re, respectively. The beta-decay of 187Re had the lowest known Q value until 2005, when the beta decay of 115In to the first excited state of 115Sn was discovered in Gran Sasso underground laboratory. Last year two independent ion trap measurements confirmed that this decay breaks the former record by an order of magnitude.
Our theoretical study on this tiny decay channel complemented the experimental effort by the JYFLTRAP group in Finland and HADES underground laboratory in Belgium. A significant discrepancy between the experimental and theoretical results was found. This might be explained by various atomic contributions known to grow larger as the Q value decreases. However, the traditional recipes for taking these effects into account break down on this new ultra-low Q value regime, providing new challenges for theorists on the borderline between nuclear and atomic physics.
Mustonen M. T.
Suhonen Jouni
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