New Determination of the H-2(d,p)H-3 and H-2(d,n)He-3 Reaction Rates at Astrophysical Energies

Kód výsledku v IS VaVaI

RIV/61389005:_____/14:00429047 - isvavai.cz

Výsledek na webu

http://dx.doi.org/10.1088/0004-637X/785/2/96

DOI - Digital Object Identifier

10.1088/0004-637X/785/2/96

Jazyk výsledku

angličtina

Název v původním jazyce

New Determination of the H-2(d,p)H-3 and H-2(d,n)He-3 Reaction Rates at Astrophysical Energies

Popis výsledku v původním jazyce

The cross sections of the H-2(d,p)H-3 and H-2(d,n)He-3 reactions have been measured via the Trojan Horse method applied to the quasi-free H-2(He-3, p(3)H)H-1 and H-2(He-3,n(3)He)H-1 processes at 18 MeV off the proton in He-3. For the first time, the barenucleus S(E) factors have been determined from 1.5 MeV, across the relevant region for standard Big Bang nucleosynthesis, down to the thermal energies of deuterium burning in the pre-main-sequence (PMS) phase of stellar evolution, as well as of future fusion reactors. Both the energy dependence and the absolute value of the S(E) factors deviate by more than 15% from the available direct data and existing fitting curves, with substantial variations in the electron screening by more than 50%. As a consequence, the reaction rates for astrophysics experience relevant changes, with a maximum increase of up to 20% at the temperatures of the PMS phase. From a recent primordial abundance sensitivity study, it turns out that the H-2(d,n)He-3 re

Název v anglickém jazyce

New Determination of the H-2(d,p)H-3 and H-2(d,n)He-3 Reaction Rates at Astrophysical Energies

Popis výsledku anglicky

The cross sections of the H-2(d,p)H-3 and H-2(d,n)He-3 reactions have been measured via the Trojan Horse method applied to the quasi-free H-2(He-3, p(3)H)H-1 and H-2(He-3,n(3)He)H-1 processes at 18 MeV off the proton in He-3. For the first time, the barenucleus S(E) factors have been determined from 1.5 MeV, across the relevant region for standard Big Bang nucleosynthesis, down to the thermal energies of deuterium burning in the pre-main-sequence (PMS) phase of stellar evolution, as well as of future fusion reactors. Both the energy dependence and the absolute value of the S(E) factors deviate by more than 15% from the available direct data and existing fitting curves, with substantial variations in the electron screening by more than 50%. As a consequence, the reaction rates for astrophysics experience relevant changes, with a maximum increase of up to 20% at the temperatures of the PMS phase. From a recent primordial abundance sensitivity study, it turns out that the H-2(d,n)He-3 re

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BG - Jaderná, atomová a molekulová fyzika, urychlovače

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2014

Kód důvěrnosti údajů

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

Název periodika

Astrophysical Journal

ISSN

0004-637X

e-ISSN

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Svazek periodika

785

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

17

Strana od-do

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Kód UT WoS článku

000335736800015

EID výsledku v databázi Scopus

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