Tracking electrons from double beta decay: How far can you push the TPC?

Moe, M.K.; Nelson, M.A.; Vient, M.A.

doi:10.1016/0146-6410(94)90023-X

Tracking electrons from double beta decay: How far can you push the TPC?

1994

14 pages

Published in:

Prog.Part.Nucl.Phys. 32 (1994) 247-260

Contribution to:

International School on Nuclear Physics: 15th Course: Neutrinos in Cosmology, Astroparticle and Nuclear Physics

DOI:

10.1016/0146-6410(94)90023-X

View in:

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Abstract: (Elsevier)

New results are reported from time-projection-chamber measurements of the double beta decay of 100 Mo and 150 Nd. A previously-observed high-energy anomaly has been eliminated by improved energy resolution. Kurie plots of the two-neutrino spectra show end-point energies close to the reported parent-daughter mass differences. The 150 Nd source has produced a new direct-counting 90% confidence neutrino-majoron coupling limit of 〈 g ν , χ 〉 < 7.0 × 10 −5 . The strengths and weaknesses of the TPC, and the feasibility of a larger TPC for neutrinoless double beta decay are discussed.