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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The $^{18}$Ne($\alpha$,$p$)$^{21}$Na reaction is thought to be one of the keybreakout reactions from the hot CNO cycles to the rp-process in type I x-raybursts. In this work, the resonant properties of the compound nucleus $^{22}$Mghave been investigated by measuring the resonant elastic scattering of$^{21}$Na+$p$. An 89 MeV $^{21}$Na radioactive beam delivered from the CNSRadioactive Ion Beam Separator bombarded an 8.8 mg/cm$^2$ thick polyethylene(CH$_{2}$)$_{n}$ target. The $^{21}$Na beam intensity was about2$\times$10$^{5}$ pps, with a purity of about 70% on target. The recoiledprotons were measured at the center-of-mass scattering angles of$\theta_{c.m.}$$\approx$175.2${^\circ}$, 152.2${^\circ}$, and 150.5${^\circ}$by three sets of $\Delta E$-$E$ telescopes, respectively. The excitationfunction was obtained with the thick-target method over energies$E_x$($^{22}$Mg)=5.5--9.2 MeV. In total, 23 states above the proton-thresholdin $^{22}$Mg were observed, and their resonant parameters were determined viaan $R$-matrix analysis of the excitation functions. We have made several new$J^{\pi}$ assignments and confirmed some tentative assignments made in previouswork. The thermonuclear $^{18}$Ne($\alpha$,$p$)$^{21}$Na rate has beenrecalculated based on our recommended spin-parity assignments. Theastrophysical impact of our new rate has been investigated through one-zonepostprocessing x-ray burst calculations. We find that the$^{18}$Ne($\alpha$,$p$)$^{21}$Na rate significantly affects the peak nuclearenergy generation rate, reaction fluxes, as well as the onset temperature ofthis breakout reaction in these astrophysical phenomena.

Investigation of thermonuclear $^{18}$Ne($\alpha$,$p$)$^{21}$Na rate via resonant elastic scattering of $^{21}$Na+$p$