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Nachrichten, Termine, Experten
Nachrichten, Termine, Experten
Abb. 2. Energieschema für den Zerfall von Gadolinium-152 durch neutrinolosen Doppeleinfang. Der Endzustand von Samarium-152 ist in dessen Atomhülle doppelt angeregt, da die zwei Elektronen in den unteren Schalen nach dem Einfang fehlen (Anregungsenergie B2h). Der alte Wert für die Energiedifferenz Qee zwischen Mutter- und Tochternuklid ergab eine leicht negative Zerfallsenergie Delta = Qee - B2h, war aber zugleich sehr ungenau (Fehlerbalken links). Die neue Messung für Qee liefert einen wesentlich präziseren, positiven(!) aber recht kleinen Delta-Wert, so dass der Doppeleinfang nicht nur möglich ist sondern resonant verstärkt auftreten sollte, sofern das Neutrino sein eigenes Antiteilchen ist.
Grafik: MPI für Kernphysik
(93 KB, 3024 x 2268 pixels)
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