Electron scattering study of the 10.32 MeV transition inCa40

Abstract

Values of the form factor for the 10.32 MeV transition in ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}$ have been measured at six different low momentum transfers corresponding to incident electron energies between 31 and 65 MeV and scattering angles of 127.8° and 162.4°. Analysis of the data shows that the transition is transverse and $M1\mathrm{}$. Our data in conjunction with that of earlier workers yield a value of ${\Gamma }_0\mathrm{}\left(M1\mathrm{}\right)=4.82\mathrm{}\pm 0.26$ eV for the ground state transition width. It is shown that in the low momentum transfer range covered in this work, $q<\mathrm{}0.55\mathrm{}$ ${\mathrm{fm}}^{-1\mathrm{}}$, this result is essentially model independent. Results for the transition at 9.86 MeV state are also discussed.