scholarly journals α+d→Li6+γ astrophysical S factor and its implications for Big Bang nucleosynthesis

2017 ◽  
Vol 96 (4) ◽  
Author(s):  
A. Grassi ◽  
G. Mangano ◽  
L. E. Marcucci ◽  
O. Pisanti
Keyword(s):  
Big Bang ◽  
Big Bang Nucleosynthesis ◽  
S Factor

scholarly journals Astrophysical S-factor for the 2H(ρ,γ)3He reaction at big-bang nucleosynthesis energies

2020 ◽  
Vol 227 ◽  
pp. 02015
Author(s):  
Isabela Tišma ◽  
Matej Lipoglavšek ◽  
Miha Mihoviloviĉ ◽  
Sabina Markelj ◽  
Matjaž Vencelj ◽  
...  
Keyword(s):  
Energy Range ◽  
Ab Initio ◽  
Center Of Mass ◽  
Big Bang ◽  
Angular Distributions ◽  
Mass Energy ◽  
Big Bang Nucleosynthesis ◽  
Center Of Mass Energy ◽  
S Factor ◽  
Γ Ray

We report on our latest experimental study of the 2H(ρ,γ)3He reaction in the energy range of interest for big-bang nucleosynthesis. The differential cross section at 135° and γ)-ray angular distributions were measured and compared with the results deduced from the latest ab-initio calculation. The astrophysical S-factor for the 2H(ρ,γ)3He reaction was obtained in the center-of-mass energy range E = 97-210 keV, and it is found to be in reasonable agreement with that predicted by the ab-initio calculation.

scholarly journals Underground Measurement of 6Li(p,γ)7Be and 6Li(p,3He)4He Performed at LUNA

2020 ◽  
Vol 1643 (1) ◽  
pp. 012046
Author(s):  
T Chillery
Keyword(s):  
Composition Studies ◽  
Nuclear Astrophysics ◽  
Big Bang ◽  
Abundance Ratio ◽  
Low Energy ◽  
Big Bang Nucleosynthesis ◽  
Target Composition ◽  
S Factor ◽  
Background Measurement ◽  
Proton Induced Reactions

Abstract Proton-induced reactions on 6Li play an important role in nuclear astrophysics studies in relation to primordial lithium abundances. Whilst big bang nucleosynthesis theory excludes the existence of primordial 6Li, the 6Li/7Li abundance ratio observed in pre-main sequence stars is ≃ 0.5. The 6Li(p,3He)4He and 6Li(p,γ)7Be reactions are the main processes that contribute to 6Li destruction in stars. Both reactions were recently studied at LUNA via proton bombardment of 6Li-enriched targets, with complementary target composition studies performed at HZDR. Improvements on the precision of the low-energy S-factor values are expected from this study. Notably, the low-background measurement at LUNA will assist the search for a recently claimed 6Li(p,γ)7Be low energy resonance at E r ≃ 195 keV. I present the LUNA experimental setup and preliminary results of the ongoing analysis.

scholarly journals Astrophysical S-factor for destructive reactions of lithium-7 in big bang nucleosynthesis

2014 ◽  
Author(s):  
Tetsuro Komatsubara ◽  
YoungKwan Kwon ◽  
JunYoung Moon ◽  
Yong-Kyun Kim ◽  
Chang-Bum Moon ◽  
...  
Keyword(s):  
Big Bang ◽  
Big Bang Nucleosynthesis ◽  
S Factor

Astrophysical S-factor of the 23He(α,γ)37Be reaction in the Big-Bang nucleosynthesis

New Astronomy ◽  
2018 ◽  
Vol 61 ◽  
pp. 14-18
Author(s):  
Motahareh Ghamary ◽  
Hossein Sadeghi ◽  
Saeed Mohammadi
Keyword(s):  
Big Bang ◽  
Big Bang Nucleosynthesis ◽  
S Factor ◽  
The Big Bang

Refined big bang nucleosynthesis constraints onΩBandNν

1994 ◽  
Vol 72 (21) ◽  
pp. 3309-3312 ◽  
Author(s):  
Peter J. Kernan ◽  
Lawrence M. Krauss
Keyword(s):  
Big Bang ◽  
Big Bang Nucleosynthesis

scholarly journals Searching for space-time variation of the fine structure constant using QSO spectra: overview and future prospects

2009 ◽  
Vol 5 (H15) ◽  
pp. 304-304
Author(s):  
J. C. Berengut ◽  
V. A. Dzuba ◽  
V. V. Flambaum ◽  
J. A. King ◽  
M. G. Kozlov ◽  
...  
Keyword(s):  
Nuclear Reactor ◽  
Structure Constant ◽  
Big Bang ◽  
The Other ◽  
Fine Structure Constant ◽  
Spatial And Temporal Variation ◽  
Fundamental Constants ◽  
Future Prospects ◽  
Big Bang Nucleosynthesis ◽  
The Universe

Current theories that seek to unify gravity with the other fundamental interactions suggest that spatial and temporal variation of fundamental constants is a possibility, or even a necessity, in an expanding Universe. Several studies have tried to probe the values of constants at earlier stages in the evolution of the Universe, using tools such as big-bang nucleosynthesis, the Oklo natural nuclear reactor, quasar absorption spectra, and atomic clocks (see, e.g. Flambaum & Berengut (2009)).

Big Bang nucleosynthesis as a probe of varying fundamental “constants”

2007 ◽  
Author(s):  
Thomas Dent ◽  
Steffen Stern ◽  
Christof Wetterich ◽  
Arttu Rajantie ◽  
Carlo Contaldi ◽  
...  
Keyword(s):  
Big Bang ◽  
Fundamental Constants ◽  
Big Bang Nucleosynthesis

scholarly journals Big-bang nucleosynthesis in a Brans-Dicke cosmology with a varying $\mathsf{\Lambda}$ term related to WMAP

2006 ◽  
Vol 448 (1) ◽  
pp. 23-27 ◽  
Author(s):  
R. Nakamura ◽  
M. Hashimoto ◽  
S. Gamow ◽  
K. Arai
Keyword(s):  
Big Bang ◽  
Big Bang Nucleosynthesis
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