From Beta Decay to Weak Interactions

Primordial nucleosynthesis is regarded as a success story of the standard big bang (SBB) cosmology. In this article nucleosynthesis is explored in models in which the cosmological scale factor R(t) increases linearly with time. This relationship of R(t) and t continues from the period when nucleosynthesis begins until the present time. It turns out that weak interactions remain in thermal equilibrium upto temperatures which are two orders of magnitude lower than the corresponding (weak interaction decoupling) temperatures in SBB. Inverse beta decay of the proton can ensure adequate production of helium while producing primordial metallicity much higher than that produced in SBB. Attractive features of such models are the absence of the horizon, flatness and age problems as well consistency with classical cosmological tests.

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Weak Interactions and Nuclear Beta Decay

Physics Today ◽

10.1063/1.3034160 ◽

1967 ◽

Vol 20 (2) ◽

pp. 73-73 ◽

Cited By ~ 1

Author(s):

H. F. Schopper ◽

M. E. Rose

Keyword(s):

Beta Decay ◽

Weak Interactions ◽

Nuclear Beta Decay

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Nuclear and Detector Sensitivities for Neutrinoless Double Beta-Decay Experiments

Advances in High Energy Physics ◽

10.1155/2021/6666720 ◽

2021 ◽

Vol 2021 ◽

pp. 1-6

Author(s):

Hiroyasu Ejiri

Keyword(s):

Beta Decay ◽

Particle Physics ◽

Weak Interactions ◽

High Sensitivity ◽

Neutrinoless Double Beta Decay ◽

Majorana Neutrino ◽

Double Beta Decay ◽

Neutrino Masses ◽

Ultrahigh Sensitivity ◽

Electroweak Model

Neutrinoless double beta-decay (DBD) is of current interest in high-sensitivity frontiers of particle physics. The decay is very sensitive to Majorana neutrino masses, neutrino CP phases, right-handed weak interactions, and others, which are beyond the standard electroweak model. DBDs are actually ultrarare events, and thus, DBD experiments with ultrahigh sensitivity are required. Critical discussions are presented on nuclear and detector sensitivities for high-sensitivity DBD experiments to study the neutrino masses in the normal and inverted mass hierarchies.

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