![]() Bishop et al., First Observation of the β3αp Decay of 13O via β-Delayed Charged-Particle, Physical Review Letters 130, 222501 (2023). Several of the authors also acknowledge travel support from the IBS grant and the National Research Foundation of Korea grant, both funded by the government of the Republic of Korea. This work was supported by the Department of Energy Office of Science, Office of Nuclear Science, and by the National Nuclear Security Administration through the Center for Excellence in Nuclear Training and University Based Research (CENTAUR). School of Physics & Astronomy, University of Birmingham, Funding ContactĬyclotron Institute and Department of Physics & Astronomy, Texas A&M Bishop Beta plus is a type of radioactive decay. This type of decay decreases the atomic number by 1, but does not change the mass number. In beta plus decay, a proton decays into a neutron, a positron, and a neutrino: p+ n0 + e+ + e. This allowed them to identify the rare events (occurring only once per 1,200 decays) as those where four of the particles are emitted following beta-decay. Beta particles are electrons or positrons (positively charged electrons, also called antielectrons). ![]() Next, they analyzed the data with a computer program to identify the tracks the particles leave in the gas. By implanting the oxygen-13 into the detector one nucleus at a time and waiting for it to decay, the researchers measured any particles that boil off following the beta-decay using the TexAT TPC. The material stops inside this detector, which is filled with carbon dioxide gas, and decays after about ten milliseconds by emitting a positron and a neutrino (beta-plus decay). They sent this beam of radioactive material, oxygen-13, into a piece of equipment known as the Texas Active Target Time Projection Chamber (TexAT TPC). In this experiment, researchers used a particle accelerator known as a cyclotron at the Cyclotron Institute at Texas A&M University to produce a beam of radioactive nuclei at high energies (approximately 10% the speed of light). The findings can inform scientists about decay processes and the properties of the nucleus before the decay. This new decay mode is the first observation of three helium-nuclei (alpha particles) and a proton being emitted following beta-decay. ![]() ![]() After this initial beta-decay, the resulting nucleus can have enough energy to boil off extra particles and make itself more stable. This is where a proton turns into a neutron and emits some of the produced energy by emitting a positron and an antineutrino. Scientists have previously observed interesting modes of radioactive decay following the process called beta-plus decay. Scientists observed this decay by watching a single nucleus break apart and measuring the breakup products. In this decay, a lighter form of oxygen, oxygen-13 (with eight protons and five neutrons), decays by breaking into three helium nuclei (an atom without the surrounding electrons), a proton, and a positron (the antimatter version of an electron). Scientists have now observed a new decay mode for the first time. Some materials may undergo radioactive decay to form more stable isotopes. Not all of the material around us is stable. ![]()
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