Resonance parameters of the first 1/2+ state in 9Be and astrophysical implications
Abstract
Spectra of the 9Be(e,e') reaction have been measured at the S-DALINAC at an electron energy E0 = 73 MeV and scattering angles of 93 and 141 with high energy resolution up to excitation energies Ex = 8 MeV. The astrophysically relevant resonance parameters of the first excited 1/2+ state of 9Be have been extracted in a one-level approximation of R-matrix theory resulting in a resonance energy ER = 1.748(6) MeV and width GammaR = 274(8) keV in good agreement with the latest 9Be(gamma,n) experiment but with considerably improved uncertainties. However, the reduced B(E1) transition strength deduced from an extrapolation of the (e,e') data to the photon point is a factor of two smaller. Implications of the new results for a possible production of 12C in neutron-rich astrophysical scenarios are discussed.
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