Predictions on double beta decay
mediated by light singlet fermions in the [W.sub.L] - [W.sub.L] channel are discussed in Section 6 where we have given its mass limits from the existing experimental data.
This pathway to the creation of heavier and heavier nuclei is called the s -process, since the rate of neutron capture is slow compared to the rate of beta decay
. Accordingly, atoms synthesized via this mechanism are called s-process elements.
Vogel, "Double beta decay
," Annual Review of Nuclear and Particle Science, vol.
In order to improve the determination of |[V.sub.ud]| beyond the precision of obtained from the above systems, one can study the neutron beta decay
. An advantage of the study of the neutron system is the relatively stronger understanding of the necessary corrections.
Most important for the neutrinoless double beta decay
are the decays of [sup.68]Ge and [sup.60]Co since Q values above [Q.sub.[beta][beta]] = 2039 keV occur in the chain, and the lifetimes are in the range of years.
Key words: beta decay
; CP-violation; physics beyond the Standard Model; time-reversal violation.
Back around 1930, difficulties in balancingenergy in beta decay
of atomic nuclei led Wolfgang Pauli to postulate the existence of a subatomic particle that had no rest mass, which Enrico Fermi named "little neutral one' or neutrino.
de Fatis, "Cerenkov emission as a positive tag of double beta decays
in bolometric experiments," European Physical Journal C, vol.
A false asymmetry associated with the correlation [s.sub.n] * [k.sub.[beta]] in neutron beta decay
, where [k.sub.[beta]] is the propagation direction of the beta particle, is reduced by the fraction of neutrons that decay in the target ([10.sup.-7]) and the fractional gamma yield for a typical electron from the decay, yielding an estimate for the false asymmetry below [10.sup.-12].
In the following sections we discuss the observable signatures of these coefficients for Lorentz violation in different types of neutrino experiments including oscillations, neutrino velocity, and beta decays
Outside of a nucleus, however, free neutrons last only about 10 minutes before disintegrating by means of beta decay