Quadruple jump controversy Quadruple jump controversy At the 2010 Winter Olympics held in Vancouver, British Columbia, Canada, the final results of the men's figure skating competition sparked what has been dubbed a quadruple jump controversy. At the heart of it lies a quadruple jump, the toughest jump there is in figure skating, done in combination with a triple toe loop, which Evgeni Plushenko of Russia landed in both his short and long programs. Evan Lysacek of the United States, however, did not include quads in either of his programs. Plushenko, who led Lysacek by half a point after the short figure skating program,
Double beta decay or double beta decay are predicted to be very long; hence, quadruple beta decay is unlikely to be realized. The eight candidate nuclei for quadruple beta decay include Zr, Xe, and Nd capable of quadruple beta-minus decay, and Xe, Ba, Gd, and Dy capable of quadruple beta-plus decay or electron capture. In theory, quadruple beta decay may be experimentally observable in three of these nuclei, with the most promising candidate being Nd. Double beta decay 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,