Quadruple jump controversy for the quadruple jump and penalizing skaters if it is not done successfully. In 2008, the scoring system adopted a requirement that a failed quad receive a deduction of up to three points. This has led to some skaters feeling that attempting to do a quad is not worth the risk and reward, as much easier jumps present a better opportunity for athletes to collect the needed points. "I had one fall in my program on a triple lutz. They considered it a double with a fall. I got 1.09 points. Then Nobunari Oda fell on a quad but they
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,