Nilsson-pairing model for double beta decay

The double beta decay process for Ca48 and Ge76 is considered. The inhibition of the process for Ca48, previously considered by Khodel, is discussed in terms of a K selection rule. The large value found for the Ge76 transition to Se76, by Haxton, Stephenson, and Strottman, is here illustrated by a pairing calculation using asymptotic Nilsson wave functions. The coherence of the process is clearly shown in this model. The contribution of high lying intermediate states, especially due to delta particle-nucleon hole states, is discussed. RADIOACTIVITY Double beta decay, pairing correlations, delta admixtures.