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

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F23%3A00572943" target="_blank" >RIV/61389005:_____/23:00572943 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1051/epjconf/202327911001" target="_blank" >https://doi.org/10.1051/epjconf/202327911001</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/epjconf/202327911001" target="_blank" >10.1051/epjconf/202327911001</a>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

The p - p-chain reaction He-3(alpha, gamma)Be-7 can sensitively influence the prediction of the Be-7 and B-8 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 similar to 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 Li-6(He-3,d)Be-7 alpha-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 He-3(alpha, gamma)Be-7 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 Li-6(p,gamma)Be-7 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.

Název v anglickém jazyce

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

Popis výsledku anglicky

The p - p-chain reaction He-3(alpha, gamma)Be-7 can sensitively influence the prediction of the Be-7 and B-8 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 similar to 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 Li-6(He-3,d)Be-7 alpha-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 He-3(alpha, gamma)Be-7 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 Li-6(p,gamma)Be-7 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.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

EPJ Web of Confereneces

ISBN

—

ISSN

2100-014X

e-ISSN

—

Počet stran výsledku

6

Strana od-do

11001

Název nakladatele

edp sciences

Místo vydání

Les Ulis

Místo konání akce

Geneva

Datum konání akce

5. 9. 2022

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

000995956500032