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T: Fachverband Teilchenphysik

T 502: Niederenergetische Neutrinos II

T 502.6: Vortrag

Freitag, 9. März 2007, 15:20–15:35, INF 308 Kl. HS

Limit on the radiative 0 neutrino-ECEC decay of 36Ar — •Oleg Chkvorets¹, Marik Barnabé Heider¹, Konstantin Gusev^2,3, and Stefan Schoenert¹ for the GERDA collaboration — ¹Max-Planck-Institut für Kernphysik, Heidelberg, Germany — ²Joint Institute for Nuclear Research (JINR), Dubna, Russia — ³Institute for Nuclear Research, Moscow, Russia

First limits on the neutrinoless double electron capture process of 36Ar have been derived from measurements with a 1.6 kg bare high-purity germanium detector submerged in 70 liters of liquid argon. The obtained limit for the radiative decay with the emission of a single photon is T1/2(0+ giving g.s. with single gamma) >= 1.9x10^18 years (68% C.L.). It is comparable to recent results obtained in dedicated experiments investigating different isotopes. The measurements were performed during detector tests in the framework of the Gerda experiment.