Nuclear astrophysics at Gran Sasso Laboratory: the LUNA experiment

Cavanna, F.

doi:10.1051/epjconf/201817801007

Cited by 4 publications

(3 citation statements)

References 33 publications

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“…A very recent breakthrough in BBN has been the new underground measurement of the D(p,γ) 3 He cross section by the LUNA Collaboration [14] at the Gran Sasso National Laboratory in Italy, which reached a precision of the order of 3% in the center of mass energy relevant for the BBN dynamics, and which allowed to have an estimate of R dpγ with unprecedented precision [15,16]. Since this rate is one of the leading parameter in quantifying the amount of Deuterium burning, the smaller uncertainty on R dpγ is now fixing the D/H ratio for a fixed baryon density, with a decreased error, a factor two larger than the one of its astrophysical measurement.…”

Section: Introductionmentioning

confidence: 99%

Primordial Deuterium after LUNA: concordances and error budget

Pisanti

Mangano

Miele

et al. 2021

J. Cosmol. Astropart. Phys.

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The accurate evaluation of the nuclear reaction rates and corresponding uncertainties is an essential requisite for a precise determination of light nuclide primordial abundances. The recent measurement of the D(p, γ)3He radiative capture cross section by the LUNA collaboration, with its order 3% error, represents an important step in improving the theoretical prediction for Deuterium produced in the early universe. In view of this recent result, we present in this paper a full analysis of its abundance, which includes a new critical study of the impact of the other two main processes for Deuterium burning, namely the deuteron-deuteron transfer reactions, D(d, p)3H and D(d, n)3He. In particular, emphasis is given to the statistical method of analysis of experimental data, to a quantitative study of the theoretical uncertainties, and a comparison with similar studies presented in the recent literature. We then discuss the impact of our study on the concordance of the primordial nucleosynthesis stage with the Planck experiment results on the baryon density Ωbh2 and the effective number of neutrino parameter Meff, as function of the assumed value of the 4He mass fraction Yp. While after the LUNA results, the value of Deuterium is quite precisely fixed, and points to a value of the baryon density in excellent agreement with the Planck result, a combined analysis also including Helium leads to two possible scenarios with different predictions for Ωbh2 and , depending on the value adopted for Yp from astrophysical measurements. We argue that new results on the systematics and mean value of Yp in metallicity poor environments would be of great importance in assessing the overall concordance of the standard cosmological model.

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Section: Introductionmentioning

confidence: 99%

Primordial Deuterium after LUNA: concordances and error budget

Pisanti

Mangano

Miele

et al. 2021

J. Cosmol. Astropart. Phys.

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“…Therefore, a precise experimental measurement of the rates of these nuclear reactions is needed to guarantee a precise estimate of their primordial abundances. In this vein, the reaction 2 H(p,γ) 3 He, which was one of the main sources of uncertainties in the determination of the deuterium abundance, has been recently measured [20,21] by the LUNA collaboration [22] with a ∼ 3% precision in the relevant center of mass energy for BBN. Historically, a theoretical description of BBN had its origins in the studies of [23,24,25,26,27].…”

Section: Introductionmentioning

confidence: 99%

PArthENoPE Revolutions

Gariazzo,

de Salas,

Pisanti

et al. 2021

Preprint

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This paper presents the main features of a new and updated version of the program PArthENoPE, which the community has been using for many years for computing the abundances of light elements produced during Big Bang Nucleosynthesis. This is the third release of the PArthENoPE code, after the 2008 and the 2018 ones, and will be distributed from the code's website, http://parthenope.na.infn.it. Apart from minor changes, the main improvements in this new version include a revisited implementation of the nuclear rates for the most important reactions of deuterium destruction, 2 H(p,γ) 3 He, 2 H(d, n) 3 He and 2 H(d, p) 3 H, and a re-designed GUI, which extends the functionality of the previous one. The new GUI, in particular, supersedes the previous tools for running over grids of parameters with a better management of parallel runs, and it offers a brand-new set of functions for plotting the results.

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“…The most famous is the underground laboratory in Gran Sasso (LUNA), Italy. This facility uses a low-energy accelerator to measure cross sections for reactions involving stable beams and more than 75 targets at significantly lower energies than those previously achieved [2]. But still extrapolations to astrophysical energies is usually required.…”

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confidence: 99%

Trojan horse method as surrogate indirect approach to study resonant reactions in nuclear astrophysics

Mukhamedzhanov,

Kadyrov,

Pang

2020

Preprint

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The primary goal of the Trojan horse method (THM) is to analyze resonant rearrangement reactions when the density of the resonance levels is low and statistical models cannot be applied. The main difficulty of the analysis is related with the facts that in the final state the THM reaction involves three particles and that the intermediate particle, which is transferred from the Trojan horse particle to the target nucleus to form a resonance state, is virtual. Another difficulty is associated with the Coulomb interaction between the particles, especially, taking into account that the goal of the THM is to study resonant rearrangement reactions at very low energies important for nuclear astrophysics. The exact theory of such reactions with three charged particles is very complicated and is not available. This is why different approximations are used to analyze THM reactions. In this review paper we describe a new approach based on a few-body formalism that provides a solid basis for deriving the THM reaction amplitude taking into account rescattering of the particles in the initial, intermediate and final states of the THM reaction. Since the THM uses a two-step reaction in which the first step is the transfer reaction populating a resonance state, we address the theory of the transfer reactions. The theory is based on the surface-integral approach and Rmatrix formalism. We also discuss application of the THM to resonant reactions populating both resonances located on the second energy sheet and subthreshold resonances, which are subthreshold bound states located at negative energies close to thresholds. We consider the application of the THM to determine the astrophysical factors of resonant radiative-capture reactions at energies so low that direct measurements can hardly be performed due to the negligibly small penetrability factor in the entry channel of the reaction. We elucidated the main ideas of the THM and outline necessary conditions to perform the THM experiments.

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Nuclear astrophysics at Gran Sasso Laboratory: the LUNA experiment

Cited by 4 publications

References 33 publications

Primordial Deuterium after LUNA: concordances and error budget

Primordial Deuterium after LUNA: concordances and error budget

PArthENoPE Revolutions

Trojan horse method as surrogate indirect approach to study resonant reactions in nuclear astrophysics

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