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SUMMARY:BBN\, Underground Nuclear Astrophysics and Neutrinos
DTSTART;VALUE=DATE-TIME:20200225T122000Z
DTEND;VALUE=DATE-TIME:20200225T124000Z
DTSTAMP;VALUE=DATE-TIME:20260615T114327Z
UID:indico-contribution-1465@indico.tlabs.ac.za
DESCRIPTION:Speakers: Carlo Gustavino (INFN-Roma)\nNuclear astrophysics pl
 ays an important role in understanding open issues of neutrino physics. As
  an example\, the two key reactions of the solar p-p chain $^3He(^3He\,2p)
 ^4He$ and $^3He(^4He\,\\gamma)^7Be$ were studied at low energy with LUNA (
 Laboratory for Underground Nuclear Astrophysics)\, providing an accurate e
 xperimental footing for the Standard Solar Model and consequently to study
  the neutrino mixing parameters. \nThe LUNA collaboration has now complete
 d the measurement of the $D(p\,\\gamma)^3He$ cross section with unpreceden
 ted precision at Big Bang Nucleosynthesis (BBN) energies. The accurate stu
 dy of this deuterium-burning process provides a precise determination of t
 he universal baryon density $\\Omega_b$\, in agreement with the value deri
 ved from CMB data and with comparable accuracy. \nFinally\, our analysis s
 everely constrains the possible existence of "dark radiation"\, i.e. the e
 xistence of relativistic particles not foreseen in the standard model\, su
 ch as sterile neutrinos or hot axions [1]. The LUNA result and consequence
 s in cosmology and particle physics are discussed in this contribution.\n\
 n[1] E. Di Valentino\, C. Gustavino et al.\, Phys. Rev. D 90\, 023543 (201
 4).\n\nhttps://indico.tlabs.ac.za/event/85/contributions/1465/
LOCATION:Parallel Venue
URL:https://indico.tlabs.ac.za/event/85/contributions/1465/
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