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/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The additional resonant contribution to the potential model is examined in$\alpha$+$^{12}$C elastic scattering and the low-energy$^{12}$C($\alpha$,$\gamma$)$^{16}$O reaction. The excitation function ofelastic scattering below $E_{c.m.}= 5$ MeV seems to be reproduced by thepotential model satisfactorily, and it is not profoundly disturbed by theadditional resonances. The weak coupling is good enough to describe the$^{16}$O structure in the vicinity of the $\alpha$-particle threshold,especially below $E_{c.m.}= 8$ MeV, corresponding to the excitation energy $E_x\approx 15$ MeV. The additional resonances give the complement of theastrophysical $S$-factors from the simple potential model. The $S$-factor of$^{12}$C($\alpha$,$\gamma$)$^{16}$O at $E_{c.m.}=300$ keV is dominated by the$E$2 transition, which is enhanced by the subthreshold 2$^+_1$ state at $E_x=6.92$ MeV. The contribution from the subthreshold 1$^-_1$ state at $E_x= 7.12$MeV is predicted to be small. The additional resonances do not give the largecontribution to the thermonuclear reaction rates of$^{12}$C($\alpha$,$\gamma$)$^{16}$O at helium burning temperatures.

Additional resonant contribution to the potential model for the 12C(alpha,gamma)16O reaction