Double beta decay pdf files

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Neutrino-less double-beta decay in the shell model and the IBM P. Van Isacker, GANIL, France J. Engel*, University of North Carolina, Chapel Hill, US K. Nomura**, University of Zagreb, Croatia *supported by FUSTIPEN **Marie Curie fellow. Neutrino-less ββdecay The process: Importance: neutrinos are Majorana particles with mass, violation of lepton number, physics beyond the standard model Conceptual Design activities (tied to DOE CD-0 for double-beta decay) • Extensive collaboration experience with ββ-decay experiments and low background, large neutrino detectors • Good communication and cooperation with GERDA (esp. joint simulation effort "MaGe"); LoI to combine for a future 1 ton scale experiment 21. Iterative Design Process Reference Design Simulation Background 276 A.P. Meshik et al. / Nuclear Physics A 809 (2008) 275-289 Fig. 1. Half-lives of 130Te double beta decay measured in geological Te samples tend to form two distinct groups. erals of different ages, have yielded 130Te DBDHLs that tend to fall into two distinct groups, 2.5 ±0.4 ×1021 yr [2-10] and 8 ±1 ×1020 yr [11-18], which clearly differ substantially more In nuclear physics, double beta decay is a type of radioactive decay in which two neutrons are simultaneously transformed into two protons, or vice versa, inside an atomic nucleus. As in single beta decay, this process allows the atom to move closer to the optimal ratio of protons and neutrons. Search of New Physics Beyond the Standard Model in Double Beta Decay DIPARTIMENTO DI FISICA E ASTRONOMIA "ETTORE MAJORANA" DOTTORATO DI RICERCA IN FISICA ANNO ACCADEMICO 2018-2019 Search of New Physics Beyond the Standard Model in Double Beta Decay 2 CFU Teaching staff FRANESCO CAPPUZZELLO Email: cappuzzello@lns.infn.it Neutrino physics and neutrinoless double beta decay Experimental challenges Present experimental state of the art Future perspectives Proposed exerimental projects 2. A = 136 - - + + second order weak decay of even-even nuclei in A even multiplets 48Ca, 76Ge, 100Mo, 116Cd, 130Te, 136Xe Double beta decay -0 : (A, Z) (A, Z+2) + 2e− not allowed in Standard Model ( L=2) expected 1/2 > 1025 Neutrinoless Double Beta Decay Experimental techniques Varenna, June 2008. Outline of the lectures ¾Neutrino mass and Double Beta Decay ¾Experimental challenge and strategies ¾Present situation ¾Overview of the future projects ¾Some very promising experimental approaches ¾Prospects and conclusions. High energy resolution (<2%) No tracking capability Easy to reject 2νDBD background Low The search for neutrinoless double beta decay (0νββ) is among the highest priorities in Nuclear Physics. The goal of this program is to determine whether the Lepton Number is a globally conserved quantity, and whether neutrinos are Dirac or Majorana particles. Dirac neutrinos would require the promotion of the accidental, global symmetry of lepton number to something fundamental, making Double beta decay nuclear matrix elements (in QRPA) Fedor Šimkovic . Helmholtz International Summer School "NUCLEAR THEORY AND ASTROPHYSICAL APPLICATIONS . Dubna, Russia, July 21 - August 1, 2014 . 7/28/2014 Fedor Simkovic 2 Study