26Al(n,p1) and (n,α0) cross sections from thermal energy to 70 keV and the nucleosynthesis of 26Al
AbstractAbstract
[en] We have measured the 26Al(n,α0)23Mg and 26Al(n,p1)26Mg* cross sections from thermal energy to approximately 10 keV and 70 keV, respectively. These reactions are thought to be the major mechanisms for the destruction of 26Al in many nucleosynthesis environments; hence, an accurate determination of their rates is important for understanding the observations of γ rays from open-quotes liveclose quotes 26Al in our galaxy and of open-quotes extinctclose quotes 26Al in meteorites. The astrophysical rate for the 26Al(n,α0)23Mg reaction determined from our measurements is in good agreement with the rate determined via inverse measurements. On the other hand, the rate we determined for the 26Al(n,p1)26Mg* reaction is significantly larger than previously reported. In addition, we were able to determine this rate in the temperature range below 0.2 GK which was not covered by previous measurements. This lower temperature range may be important for understanding the production of 26Al in Red Giant stars. Both of our rates are significantly different than the rates used in most nucleosynthesis calculations. We discuss the impact of our measurements on the nucleosynthesis of 26Al. copyright 1997 The American Physical Society
Primary Subject
Secondary Subject
Record Type
Journal Article
Journal
Country of publication
Descriptors (DEI)
Descriptors (DEC)
ALUMINIUM ISOTOPES, BARYON REACTIONS, BARYONS, BETA DECAY RADIOISOTOPES, BETA-PLUS DECAY RADIOISOTOPES, CATIONS, CHARGED PARTICLES, ELECTROMAGNETIC RADIATION, ELEMENTARY PARTICLES, EVEN-EVEN NUCLEI, EVEN-ODD NUCLEI, FERMIONS, HADRON REACTIONS, HADRONS, HELIUM IONS, HYDROGEN IONS, HYDROGEN IONS 1 PLUS, IONIZING RADIATIONS, IONS, ISOTOPES, LIGHT NUCLEI, MAGNESIUM ISOTOPES, NUCLEAR REACTIONS, NUCLEI, NUCLEON REACTIONS, NUCLEONS, ODD-ODD NUCLEI, RADIATIONS, RADIOISOTOPES, SECONDS LIVING RADIOISOTOPES, STABLE ISOTOPES, STARS, SYNTHESIS, TARGETS, YEARS LIVING RADIOISOTOPES
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue