A study of the proton resonant property in 22Mg by elastic scattering of 21Na + p and its astrophysical implication in the 18Ne(α, p)21Na reaction rate

Abstract

Abstract. Proton resonances in22 Mg have been investigated by the resonant elastic scattering of 21 Na + p. The 21 Na beam with a mean energy of 4.00 MeV/nucleon was separated by the CNS radioactive-ion-beam separator (CRIB) and bombarded a thick (CH2)n target. The energy spectra of recoiled protons were measured at scattering angles of θc.m. ≈ 172• , 146• , respectively. Several excited states observed before have been confirmed including two states (at 6.616, 6.796 MeV) observed at TRIUMF. A new state at 7.06 MeV has been observed, and another new one at 7.28 MeV is tentatively identified due to its low statistics. The proton resonant parameters were deduced from an R-matrix analysis of the differential crosssection data with a SAMMY-M6-BETA code. The astrophysical implication for the 18 Ne(α, p) 21 Na reaction has been briefly discussed.PACS. 25.60.-t Reaction induced by unstable nuclei -23.50.+z Decay by proton emission -26.50.+x Nuclear physics aspects of novae, supernovae, and other explosive environments

Investigation of the thermonuclear18Ne(α,p)21Na reaction rate via resonant elastic scattering ofZhang1, He2, Parikh3 et al. 2014Phys. Rev. CSelf Cite232280View full textAdd to dashboardCite

“…In this work, the 18 Ne(α,p) 21 Na rate is determined via the measurement of the resonant elastic scattering of 21 Na+p. This is an entirely new high-statistics experiment compared to the previous one [16,17]. In the resonant elastic-scattering mechanism, 22 Mg is formed via the fusion of 21 Na+p as an excited compound nucleus, whose states promptly decay back into 21 Na+p.…”

“…3). In our previous experiment of 21 Na+p resonant elastic scattering [16,17], new spin-parity assignments were made only tentatively for the the 8.547 and 8.614 MeV states in 22 Mg due to low statistics. Those assignments gave a quite different rate for the 18 Ne(α,p) 21 Na reaction compared to the rate estimated in Chen et al work [11].…”

First measurement of S30+α resonant elastic scattering for the S30Kahl1, Yamaguchi2, Kubono3 et al. 2018Phys. Rev. CSelf Cite140100View full textAdd to dashboardCite

“…Specifically, most of the experimental data can be reproduced by a SM calculation. However, deviations higher than the expected cross sections were found in some of the measurements with 23 Na and 33 S, whereas the species 36 Ar and 40 Ar were seen to be much lower (at least for the available data). For the case of 23 Na, the work of Mohr motivated the community to reinvestigate the 23 Na(α, p) cross-section, which was finally found to be consistent with the SM calculation within the experimental uncertainties [70][71][72][73].…”

“…The experiment was carried out at the CNS Radioactive Ion Beam separator (CRIB) [34,35], owned and operated by the Center for Nuclear Study (CNS), the University of Tokyo, and located in the RIKEN Nishina Center. The CRIB facility has been a workhorse for measurements of elastic scattering of primarily astrophysical interest [36][37][38][39][40][41][42][43][44][45][46][47][48][49], schematically using similar techniques to the one adopted in the present study.…”