The history and importance of superdeformation in nuclei is briefly discussed. A simple two-level model is then employed to obtain an elegant expression for the branching ratio for the decay via the E1 process in the normal-deformed band of superdeformed nuclei. From this expression, the spreading width Γ ↓ for superdeformed decay is found to be determined completely by experimentally known qua...

We have studied the radioactive line emission expected from solar active regions after large flares, following the production of long-lived radioisotopes by nuclear interactions offlare-accelerated ions. This delayed Xand gammaray line emission can provide unique information on the accelerated particle composition and energy spectrum, as well as on mixing processes in the solar atmosphere. Tota...

The theory of quantum electrodynamics predicts that the β decay of the neutron into a proton, electron, and antineutrino is accompanied by a continuous spectrum of emitted photons described as inner bremsstrahlung. While this phenomenon has been observed in nuclear β decay and electron-capture decay for many years, it has only been recently observed in free-neutron decay. We present a detailed ...

— Comprehensive description of the phenomenology of the ββ decay is given, with emphasis on the nuclear physics aspects. After a brief review of the neutrino oscillation results and of motivation to test the lepton number conservation, the mechanism of the 0νββ is discussed. Its relation to the lepton flavor violation involving charged leptons and its use as a diagnostic tool of the 0νββ mechan...

We calculate the lifetime of deuteron from dimension-six quark operators that violate baryon number by one unit. construct an effective field theory for $|\Delta B|=1$ interactions give rise to nucleon and $\Delta B=1$ decay in a systematic expansion. show up including next-to-leading order rate is given sum rates free proton neutron. The first nuclear correction expected contribute at few-perc...

The ?-decay of incorporated actinides continuously produces helium, resulting in helium accumulation and causing security concerns for nuclear waste forms. mobility is a key issue affecting the kinetics helium. energy barriers migration pathways potential high-level forms, La2Zr2O7 pyrochlore, have been investigated this work using climbing image nudged elastic band method with density function...