Investigation of excited states in Mg22 via resonant elastic scattering of Na21+p and its astrophysical implications

Details Investigation of excited states in Mg22 via resonant elastic scattering of Na21+p and its astrophysical implications Investigation of excited states in Mg22 via resonant elastic scattering of Na21+p and its astrophysical implications

Jul 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009phrvc..80a5801h&link_type=abstract

Physical Review C, vol. 80, Issue 1, id. 015801

Physics

Nuclear Physics

8

Reactions Induced By Unstable Nuclei, Decay By Proton Emission, Nuclear Physics Aspects Of Novae, Supernovae, And Other Explosive Environments, 20<=A<=38

Scientific paper

The excited states in Mg22 have been investigated by the resonant elastic scattering of Na21+p. A 4.0 MeV/nucleon Na21 beam was separated by the Center for Nuclear Study (CNS) radioactive ion beam separator (CRIB) and then used to bombard a thick (CH2)n target. The energy spectra of recoiled protons were measured at scattering angles of θc.m.≈172∘,146∘, and 134∘, respectively. A wide energy-range of excitation function in Mg22 (up to Ex~8.9 MeV) was obtained simultaneously with a thick-target method, and a state at 7.06 MeV was newly observed. The resonant parameters were deduced from an R-matrix analysis of the center-of-mass (c.m.) differential cross-section data with a SAMMY-M6-BETA code. The astrophysical resonant reaction rate for the Ne18(α,p)Na21 reaction was recalculated based on the present parameters. Generally speaking, the present rates are much smaller than the previous ones.

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