Nuclear Duathlon: Alpha and Beta Decay Combined ⚡ экспресс
A new form of radioactivity has been put forward — simultaneous alpha-beta decay (αβ-decay), in which a nucleus emits an alpha particle and a beta particle in one quantum leap, blending strong and weak interactions. The theory laid down criteria and pinpointed candidates across the isotope chart: five exclusive αβ⁻ (yet to be accessed) and several inclusive ones. Strikingly, the top six αβ⁺ candidates match known precursors of beta-delayed alpha emission, and their spectra are naturally explained by direct simultaneous decay. This establishes αβ-decay as a distinct process and a sharp probe of how strong and weak forces interact.
An atomic nucleus is like a crowded bus. To free up space, a group of two protons and two neutrons — a helium nucleus, an alpha particle — exits through the front door: this is alpha decay, described by George Gamow as tunneling under an energy barrier. In other cases, a neutron turns into a proton and throws an electron out the back door — beta decay, described by Enrico Fermi. Usually, the doors work separately. But researchers have proven that a simultaneous exit is possible — both doors swing open at once, and the nucleus emits both particles. This combination is the only way out for nuclei for which individual decays are forbidden. Theory pointed to several candidate isotopes, and six of them have been found in experiments. Studying their radiation spectra revealed that these nuclei had been recorded in experiments for decades, but were mistaken for a chain of ordinary events. Nature has been showing off double decay all along, and we've only now realized it. The process turned out to be an ultrasensitive probe for the Standard Model of particle physics. The weak and strong interactions work in tandem, revealing subtle effects that are invisible individually.
🎯 An alpha source in a sealed flask will produce helium on its own — just wait until the ejected nuclei capture free electrons, and you'll have gas for party balloons.