Twoneutrino double beta decay within FullyRenormalized QRPA Effect of the restoration of.pdfVIP

Two-neutrino double beta decay within Fully-Renormalized QRPA: Effect of the restoration of the Ikeda sum rule 1 1 1,2 1 ˇ L. Pacearescu , V. Rodin , F. Simkovic and Amand Faessler 1 Institut f¨ur Theoretische Physik der Universit¨at T¨ubingen, Auf der Morgenstelle 14, D-72076 T¨ubingen, Germany 2Department of Nuclear Physics, Comenius University, Bratislava, Slovakia (February 8, 2008) 3 0 0 2 Abstract g u A The recently proposed Fully-Renormalized QRPA (FR-QRPA), which fullfils 2 the Ikeda sum rule (ISR) exactly, is applied to the two-neutrino double beta 1 76 82 100 116 128 130 decay of Ge, Se, Mo, Cd, Te and Xe. The results obtained are 1 compared with those of other approaches, standard QRPA and self-consistent v 5 QRPA (SCQRPA). The similarities and the differences among the methods 3 are discussed. The influence of the restoration of the Ikeda sum rule on the 0 8 2νββ-decay amplitude is analyzed. 0 3 21.60.Jz, 23.40.Hc 0 / h t - l c u n : v i X r a Typeset using REVT X E 1 I. INTRODUCTION Observation of the neutrinoless double beta decay (0νββ-decay), violating the total lep- ton number by two units, would give unambigu