Analysis of Alpha Elastically Scattered by Light Nuclei Using Crystalline Model Approach

Amar, A.

doi:10.21608/ajnsa.2021.87395.1492

Cited by 3 publications

(4 citation statements)

References 32 publications

(111 reference statements)

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“…Blue solid triangles represent the bare-nucleus astrophysical factor from ref. [44] (including systematic error), red filled circles are the experimental astrophysical factor published in [45], empty circles are taken from [46] and black solid squares from [47]. one-step α-particle exchange mechanism.…”

Section: The Anc Experimentsmentioning

confidence: 99%

Determination of the ³He(α, γ)⁷Be and ⁶Li(p, γ)⁷Be astrophysical factors down to zero energy using the asymptotic normalization coefficients

et al. 2023

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The p - p-chain reaction 3He(α, γ)7Be can sensitively influence the prediction of the 7Be and 8B neutrino fluxes. Despite its importance, the knowledge of its reaction cross section at energies of the core of the Sun (15 keV 30 keV) is limited and the accuracy far from the desired 3% level. In the present paper the indirect measurement of the external capture contribution using the asymptotic normalization coefficient (ANC) technique is reported. The angular distributions of deuterons emitted in the 6Li(3He,d)7Be α-transfer reactions were measured and the ANCs extracted from the scaling of distorted-wave Born approximation (DWBA) and coupled-channel (CC) calculations. Then, the astrophysical S-factor for the 3He(α, γ)7Be reaction was calculated assuming E1 direct capture and the zero energy value turned out to be 0.534 0.025 keVb. Both our experimental and theoretical approaches were benchmarked through the analysis of the 6Li(p,γ)7Be astrophysical factor, with interesting astrophysical applications to the understanding of the primordial lithium problem. In particular, the present work disfavors the occurrence of a claimed 200 keV resonance in the astrophysical factor.

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Section: The Anc Experimentsmentioning

confidence: 99%

Determination of the ³He(α, γ)⁷Be and ⁶Li(p, γ)⁷Be astrophysical factors down to zero energy using the asymptotic normalization coefficients

et al. 2023

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“…Blue solid triangles mark the bare-nucleus astrophysical factor from ref. [43] (including systematic error), red filled circles are the experimental astrophysical factor in [44], empty circles are from [45] and black solid squares from [46].…”

Section: The Anc Experimentsmentioning

confidence: 99%

Determination of the astrophysical factor of the ³He(α,γ)⁷Be down to zero energy using the asymptotic normalization coefficient method

La Cognata,

Kiss,

Yarmukhamedov

et al. 2023

J. Phys.: Conf. Ser.

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The observation of neutrinos emitted in the p − p chain and in the CNO cycle can be employed to test the Standard Solar Model. The 3He(α,γ)7Be reaction is the first reaction of the 2nd and 3rd branch of the p − p chain, so the indetermination of its cross section significantly affects the predicted 7Be and 8B neutrino fluxes. Notwithstanding its relevance and the great deal of experimental and theoretical papers, information of the reaction cross section at energies of the core of the Sun (15 keV - 30 keV) is sparse and additional experimental work is necessary to attain the target (~ 3%) accuracy. The precise understanding of the external capture component to the 3He(α,γ)7Be reaction cross section is pivotal for the theoretical assessment of the reaction mechanism. In this work, the indirect measurement of this external capture component using the Asymptotic Normalization Coefficient (ANC) technique is discussed. To extract the ANC, the angular distributions of deuterons yielded in the 6Li(3He,d)7Be α-transfer reaction were detected with high precision at E3He =3.0 MeV and 5.0 MeV. The ANCs were then deduced from the juxtaposition of DWBA and CC calculations with the experimental angular distributions and the zero energy astrophysical S-factor for 3He(α,γ)7Be reaction was calculated to equal 0.534 ± 0.025 keVb. Both our experimental and theoretical approaches were tested through the analysis of the 6Li(p,γ)7Be astrophysical factor, with further interesting astrophysical implications.

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“…Optical model still applicable and has many modifications for both real and imaginary parts. New potential form for real part of the optical model has been suggested [4,20] using the crystal model to study alpha particles with light nuclei with the form:…”

Section: Crystal Modelmentioning

confidence: 99%

“…The model has succeeded to reproduce differential cross section for alpha elastically scattered 6,7 Li, 9 Be and 11 B up to 40MeV/N. The study was achieved using alpha as projectile with z=2 and A=4 for alpha elastically scattered by 6,7 Li, 9 Be and 11 B [20]. The aim of the present study is to achieve the analysis for alpha elastically scattered by 6,7 Li, 9 Be and 11 B with another approximation for 𝑧 = 3,4,5, 𝑎𝑛𝑑 𝐴 = 6,7,9, 11.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Alpha Elastically Scattered by Light Nuclei Using Crystalline Model Approach

Cited by 3 publications

References 32 publications

Determination of the ³He(α, γ)⁷Be and ⁶Li(p, γ)⁷Be astrophysical factors down to zero energy using the asymptotic normalization coefficients

Determination of the ³He(α, γ)⁷Be and ⁶Li(p, γ)⁷Be astrophysical factors down to zero energy using the asymptotic normalization coefficients

Determination of the astrophysical factor of the ³He(α,γ)⁷Be down to zero energy using the asymptotic normalization coefficient method

Applying Crystal model on different nuclear systems; deuteron, alpha and 6Li as projectiles

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Analysis of Alpha Elastically Scattered by Light Nuclei Using Crystalline Model Approach

Cited by 3 publications

References 32 publications

Determination of the 3He(α, γ)7Be and 6Li(p, γ)7Be astrophysical factors down to zero energy using the asymptotic normalization coefficients

Determination of the 3He(α, γ)7Be and 6Li(p, γ)7Be astrophysical factors down to zero energy using the asymptotic normalization coefficients

Determination of the astrophysical factor of the 3He(α,γ)7Be down to zero energy using the asymptotic normalization coefficient method

Applying Crystal model on different nuclear systems; deuteron, alpha and 6Li as projectiles

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Determination of the ³He(α, γ)⁷Be and ⁶Li(p, γ)⁷Be astrophysical factors down to zero energy using the asymptotic normalization coefficients

Determination of the ³He(α, γ)⁷Be and ⁶Li(p, γ)⁷Be astrophysical factors down to zero energy using the asymptotic normalization coefficients

Determination of the astrophysical factor of the ³He(α,γ)⁷Be down to zero energy using the asymptotic normalization coefficient method