Beta-neutrino angular correlation in the decay of 18Ne

Spectroscopy with β2p and β–ν recoil shifts

“…Finally, to distinguish di erent emission For the decays of 22 Al, 26 Figure 1 shows the result of this procedure for the case of the decay of 31 Ar. The information on unbound states in 30 S obtained in this way is comparable to, or better than, that obtained from reaction studies with stable nuclei.…”

Tensor Interaction Limit Derived From theα−β−ν¯Correlation in TrappedLi8Li1, Segel2, Scielzo3 et al. 2013Phys. Rev. Lett.361300View full textAdd to dashboardCite

“…The α particles emitted from the 8 Be * breakup are in the easily-measurable 1.5-MeV range and when emitted along the direction of a 12-keV 8 Be * recoil differ in energy by 400 keV and when emitted perpendicular to the recoil direction deviate from 180 • by 7 • . These kinematic shifts are much larger than those in other precision β-ν correlation experiments that have measured the nuclear recoil directly [4,[6][7][8] or have determined the nuclear recoil from delayed-particle emission [17][18][19][20].…”

Investigating Shakeoff Process in Precise Correlation Measurements in Nuclear β Decay

“…Since neutrinos are difficult to detect, sensitive observables for  angular correlation measurements are kinematic parameters affected by the recoiling daughter nucleus motion. Two methods are commonly used: (i) a direct method in which either the recoil energy distribution [2] or the recoil ion time of flight (ToF) distribution thanks to its detection in coincidence with the  particle [3], is measured or (ii) an indirect method in which the Doppler shift of a delayed particle ( or p) emitted during the recoil motion [4][5][6] is measured. The direct method requires the use of very clean radioactive sources, ideally placed in vacuum, due to the very low recoil kinetic energy (~ 1-2 keV at most).…”