A kinematic Doppler correction method for high resolution in-beam conversion electron spectroscopy after (HI, xn) reactions

Abstract

A new method of high resolution in-beam conversion electron spectroscopy is described using a high transmission orange-β-spectrometer to correct for the Doppler shift of conversion electrons from (HI, xn) reactions. If the emitting recoil nuclei are moving along the spectrometer axis, the Doppler broadening of conversion lines can be compensated by displacement of the ring detector away from the original focus whereby full admittance of ΔΩ 4π = 0.26 is achieved. First experimental results indicate that the half-width of conversion electron lines after 26Mg( 136Xe, 4n) 158Dy reactions at a recoil velocity ν r = 0.075 c can be reduced by about one order of magnitude to ( Δp p ) e = 0.6% which is nearly the same resolution as that obtained with a radioactive source.