Astrophysical S-factor for the He-3(alpha,gamma)Be-7 reaction via the asymptotic normalization coefficient (ANC) method

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F20%3A00533993" target="_blank" >RIV/61389005:_____/20:00533993 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1016/j.physletb.2020.135606" target="_blank" >https://doi.org/10.1016/j.physletb.2020.135606</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.physletb.2020.135606" target="_blank" >10.1016/j.physletb.2020.135606</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Astrophysical S-factor for the He-3(alpha,gamma)Be-7 reaction via the asymptotic normalization coefficient (ANC) method

Popis výsledku v původním jazyce

The detection of the neutrinos produced in the p - p chain and in the CNO cycle can be used to test the Standard Solar Model. The He-3(alpha,gamma)Be-7 reaction is the first reaction of the 2nd and 3rd branch of the p - p chain, therefore, the uncertainty of its cross section sensitively influences the prediction of the Be-7 and B-8 neutrino fluxes. Despite its importance and the large number of experimental and theoretical works devoted to this reaction, the knowledge on the reaction cross section at energies characterizing the core of the Sun (15 keV - 30 keV) is limited and further experimental efforts are needed to reach the desired (approximate to 3%) accuracy. The precise knowledge on the external capture contribution to the He-3(alpha,gamma)Be-7 reaction cross section is crucial for the theoretical description of the reaction mechanism. In the present work the indirect measurement of this external capture contribution using the Asymptotic Normalization Coefficient (ANC) technique is reported. To extract the ANC, the angular distributions of deuterons emitted in the Li-6(He-3,d)Be-7 alpha-transfer reaction were measured with high precision at E-3He = 3.0 MeV and E-3He = 5.0 MeV. The ANCs were then extracted from comparison of DWBA calculations to the measured data and the zero energy astrophysical S-factor for He-3(alpha,gamma)Be-7 reaction was found to be 0.534 +/- 0.025 keVb.

Název v anglickém jazyce

Astrophysical S-factor for the He-3(alpha,gamma)Be-7 reaction via the asymptotic normalization coefficient (ANC) method

Popis výsledku anglicky

The detection of the neutrinos produced in the p - p chain and in the CNO cycle can be used to test the Standard Solar Model. The He-3(alpha,gamma)Be-7 reaction is the first reaction of the 2nd and 3rd branch of the p - p chain, therefore, the uncertainty of its cross section sensitively influences the prediction of the Be-7 and B-8 neutrino fluxes. Despite its importance and the large number of experimental and theoretical works devoted to this reaction, the knowledge on the reaction cross section at energies characterizing the core of the Sun (15 keV - 30 keV) is limited and further experimental efforts are needed to reach the desired (approximate to 3%) accuracy. The precise knowledge on the external capture contribution to the He-3(alpha,gamma)Be-7 reaction cross section is crucial for the theoretical description of the reaction mechanism. In the present work the indirect measurement of this external capture contribution using the Asymptotic Normalization Coefficient (ANC) technique is reported. To extract the ANC, the angular distributions of deuterons emitted in the Li-6(He-3,d)Be-7 alpha-transfer reaction were measured with high precision at E-3He = 3.0 MeV and E-3He = 5.0 MeV. The ANCs were then extracted from comparison of DWBA calculations to the measured data and the zero energy astrophysical S-factor for He-3(alpha,gamma)Be-7 reaction was found to be 0.534 +/- 0.025 keVb.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

<a href="/cs/project/EF16_013%2F0001679" target="_blank" >EF16_013/0001679: SPIRAL2 - Systeme de Production d´Ions Radioactifs Accélérés en Ligne - účast České republiky - OP</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název periodika

Physics Letters. B

ISSN

0370-2693

e-ISSN

—

Svazek periodika

807

Číslo periodika v rámci svazku

AUG

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

6

Strana od-do

135606

Kód UT WoS článku

000571765700073

EID výsledku v databázi Scopus

2-s2.0-85087988861