English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Pro

Presents the zaia usage as premium feature

ZAIA

Presents AI Discovery search usage as a premium feature

AI Discovery

Presents AI Discovery explain and summary usage as a premium feature

Content Analysis

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Presents the pdf analysis as premium feature

PDF Analysis

1500 Top-up

3000 Top-up

Zendy Basic

2500 Top-up

Zendy Unlimited

Presents the access of premium content as premium feature

Premium Content

An accurate knowledge of the neutron capture cross sections of 62,63Ni iscrucial since both isotopes take key positions which affect the whole reactionflow in the weak s process up to A=90. No experimental value for the63Ni(n,gamma) cross section exists so far, and until recently the experimentalvalues for 62Ni(n,gamma) at stellar temperatures (kT=30 keV) ranged between 12and 37 mb. This latter discrepancy could now be solved by two activations withfollowing AMS using the GAMS setup at the Munich tandem accelerator which arealso in perfect agreement with a recent time-of-flight measurement. Theresulting (preliminary) Maxwellian cross section at kT=30 keV was determined tobe <sigma>30keV = 23.4 +/- 4.6 mb. Additionally, we have measured the64Ni(gamma,n)63Ni cross section close to threshold. Photoactivations at 13.5MeV, 11.4 MeV and 10.3 MeV were carried out with the ELBE accelerator atForschungszentrum Dresden-Rossendorf. A first AMS measurement of the sampleactivated at 13.5 MeV revealed a cross section smaller by more than a factor of2 compared to NON-SMOKER predictions.

Solving the stellar 62Ni problem with AMS