Conveners
Cosmology and big bang nucleosynthesis
- Shigeru Kubono (RIKEN Nishina Center)
Cosmology and big bang nucleosynthesis
- Oscar Straniero (INAF - OATe)
Cristian Massimi
(University of Bologna & INFN)
25/06/2018, 14:30
Invited
The neutron time-of-flight facility n TOF is operating at CERN since 2001. It consists of two beam lines, located at 185 and 19 m from the neutron-producing target. The main features of the neutron beam are the wide range of neutron energies, spanning over more than 10 orders of magnitude from the meV to the GeV region, the high instantaneous neutron flux and the high resolution on the neutron...
Ingo Wiedenhoever
(Florida State University)
25/06/2018, 15:00
Oral
The cross sections of nuclear reactions between the radioactive isotope 7Be and deuterium, a possible path of reducing the production of mass-7 nuclides in Big-Bang nucleosynthesis, were measured at center-of-mass energies between 0.2 MeV and 1.5 MeV. The experiment was performed with the ANASEN active-target detector system at the RESOLUT facility of Florida State University. We measured...
Sandra Maria Zavatarelli
(INFN Genova)
25/06/2018, 15:15
Oral
The abundances of the primordial elements are sensitive to the physics of the early universe and are therefore a tool to test the Standard Cosmological Model.
The Big Bang Nucleosynthesis (BBN) theory is one of the pillars of standard cosmology: for a given baryon density it provides the abundance of the primordial elements. Interestingly the abundance of deuterium deduced from observation of...
Laura Elisa Marcucci
(Pisa University)
25/06/2018, 15:30
Oral
We present a review of theoretical studies of few-nucleon reactions of astrophysical interest. In particular, we will consider, in the energy range of interest for Big Bang Nucleosynthesis (BBN), the d(p,\gamma)3He, the 4He(d,\gamma)6Li, and the 6Li(p,\gamma)7Be radiative captures. The first reaction has been studied within an ab-initio approach [1]: by using a realistic phenomenological...
Denise Piatti
(INFN Padova)
25/06/2018, 15:45
Talk, Grant Assigned
The 6Li(p, g)7Be reaction is involved in several astrophysical scenarios such as the Big Bang Nucleosynthesis, $^{6}$Li destruction in pre-main and in main sequence stars and solar neutrino production.
A recent direct measurement of the 6$Li(p,gamma)7Be cross section found a resonance-like structure at E$_c.m.$=195 keV, corresponding to a E$_{x}\sim\,$5800 keV excited state in 7Be. This...
Suqing Hou
(Institute of Modern Physics, CAS)
25/06/2018, 16:00
Oral
The disagreement of the predicted abundance of primordial 7Li with the observed abundance is a longstanding problem in Big Bang Nucleosynthesis theory[1, 2]. Solutions to this problem using conventional astrophysics and nuclear physics have not been successful over the past few decades[3]. We have investigated the impact on BBN predictions of adopting a generalized distribution called Tsallis...
Shigeru Kubono
(RIKEN Nishina Center)
27/06/2018, 09:00
Cosmology and big bang nucleosynthesis
Invited
The primordial nucleosynthesis (BBN) right after the big bang is one of the key elements that support the big bang model. The BBN is well known that it produced primarily light elements, and explains reasonably most of the elemental abundances. However, there remain some interesting and serious questions. One is the over production problem of 7 Li, called the cosmological Li problem. The BBN...
Benoit Côté
(Konkoly Observatory)
27/06/2018, 09:30
Invited
Galactic chemical evolution (GCE) is a multidisciplinary topic that involves nuclear physics, stellar evolution, galaxy evolution, and cosmology. Observations, experiments, and theories need to work together in order to build a comprehensive understanding of how the chemical elements synthesized in astronomical events are spread inside and around galaxies and recycled into new generations of...
Lucia Anna Damone
(INFN Bari)
27/06/2018, 10:00
Talk, Grant Assigned
Big Bang Nucleosynthesis (BBN) theory predicts the abundances of the light elements D, 3He, 4He and 7Li produced in the early universe. The primordial abundances of D, 3He and 4He inferred from observational data are in good agreement with predictions, however, the BBN theory overestimates the primordial 7Li abundance by about a factor of three with respect to the observations in metal poor...
Seiya Hayakawa
(Center for Nuclear Study, University of Tokyo)
27/06/2018, 10:15
Cosmology and big bang nucleosynthesis
Oral
It is still an open question that the prediction of the primordial 7Li abundance by the standard Big-Bang Nucleosynthesis (BBN) model is about 3 times larger than the observation, the so-called cosmological 7Li problem. Since the 7Li abundance strongly depends on the 7Be production and destruction rate, those of the main destruction processes 7Be(n,p)7Li and 7Be(n,α)4He need to be determined...
Livio Lamia
(University of Catania & INFN)
27/06/2018, 10:30
Cosmology and big bang nucleosynthesis
Oral
The role of the unstable 7Be during the early epoch of the Big Bang Nucleosynthesis is currently matter of study in view of the long-standing 7Li cosmological problem [1]. Recently, the Trojan Horse Method (THM) [2] have been applied for measuring the cross section of the (n,alpha) reaction channel on 7Be by means of charge-symmetry hypothesis applied to the previous 7Li(p,alpha)4He THM data...
