GERmanium Detector Array

L'esperimento GERDA (GERmanium Detector Array) è volto alla ricerca del doppio decadimento beta senza emissione di neutrini (0νββ) dell'isotopo Ge-76; si trova presso i Laboratori nazionali del Gran Sasso dell'Istituto nazionale di fisica nucleare. L'osservazione del decadimento 0νββ proverebbe che il neutrino è una particella di Majorana e che il numero leptonico non è sempre conservato: questo risultato avrebbe significative implicazioni nella fisica delle particelle ed in cosmologia[1].

La caratteristica principale dell'esperimento GERDA è l'utilizzo di una serie di rivelatori al germanio ad alta purezza (HPGe) arricchiti in Ge-76. Il germanio ha la doppia funzione di generare un eventuale decadimento 0νββ e di rivelarlo.

Nei dati raccolti durante la prima fase dell'esperimento, durata dal novembre 2011 al maggio 2013, non sono stati osservati decadimenti 0νββ[2].

Note

  1. ^ Descrizione dell'esperimento GERDA e dei suoi obiettivi (PDF), su mpi-hd.mpg.de.
  2. ^ GERDA Collaboration, M. Agostini e M. Allardt, Results on Neutrinoless Double-$\ensuremath{\beta}$ Decay of $^{76}\mathrm{Ge}$ from Phase I of the GERDA Experiment, in Physical Review Letters, vol. 111, n. 12, 19 settembre 2013, pp. 122503, DOI:10.1103/PhysRevLett.111.122503. URL consultato il 14 novembre 2016.

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