How do we understand the production of the lightest nuclides from H to Li during the first seconds of cosmic time? This article reviews recent developments based on new precision cosmic microwave background measurements from the Planck satellite and observational abundance data. Utilizing updated input on nuclear reactions and the neutron lifetime as well as limits on the baryon density of the Universe obtained from Planck data leads to a number of neutrino flavors.

pdf/big-bang-nucleosynthesis-present-status-5040zheoe2.pdf

Big bang nucleosynthesis: Present status

Experimental determination of weak mixing angles in the six quark scheme

Experimental study of neutrino oscillations at a fission reactor

The beta-decay asymmetry of the free neutron is measured with polarized neutrons and a long solenoidal beta-spectrometer with 4π electron-detection solid angle. The asymmetry parameter corrected for recoil and weak magnetism isA0=−0.1146±0.0019, implyinggA/gv=1.262±0.005 for the ratio of the axial-vector to the vector weak coupling constants.

The beta-decay asymmetry of the neutron

The creation of the light elements— cosmic rays and cosmology

A new measurement of the neutron lifetime

A measurement of parity non-conserving neutron spin rotation in lead and tin

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A new measurement of the neutron lifetime

A measurement of parity non-conserving neutron spin rotation in lead and tin