Physics
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989nimpa.284...84s&link_type=abstract
Nuclear Instruments and Methods in Physics Research Section A, Volume 284, Issue 1, p. 84-88.
Physics
20
Scientific paper
The standard Big Bang nucleosynthesis arguments are reviewed. The primordial He abundance is inferred from He-C and He-N and He-O correlations. The strengthened Li constraint as well as 2D plus 3He are used to limit the baryon density. The allowed number of neutrino families, Nν is delineated using the new value of τn = 890 +/- 4 s (τ1/2 = 10.3 min) reported at this meeting. The formal statistical result is Nν = 2.6 +/- 0.3 (1σ), providing a reasonable fit (1.3σ) to three families but making a fourth light (mν <~ 10 MeV) neutrino family exceedingly unlikely (>~ 4.7σ) (barring significant systematic errors either in D + 3He, and Li and/or 4He and/or τn). It is also shown that uncertainties induced by postulating a first-order quark-hadron phase transition do not seriously affect the conclusions.
Kawano Lawrence
Schramm David N.
No associations
LandOfFree
Cosmology and the neutron lifetime does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Cosmology and the neutron lifetime, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cosmology and the neutron lifetime will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1617211