PPT Slide

Possible Experimental Approaches to Nucleon Transfer

1) Rely on detecting the beam-like ejectile in a spectrometer

2) Rely on detecting the target-like ejectile in a Si detector

3) Detect decay gamma-rays in addition to particles

Kinematically favourable unless beam mass (and focussing) too great

Spread in beam energy (several MeV) translates to Ex measurement

Hence, need energy tagging, or a dispersion matching spectrometer

Spectrometer is subject to broadening from gamma-decay in flight

Kinematically less favourable for angular coverage

Spread in beam energy generally gives little effect on Ex measurement

Resolution limited by difference [ dE/dx(beam) - dE/dx(ejectile) ]

Target thickness limited to 0.5-1.0 mg/cm2 to maintain resolution

Need exceptionally high efficiency, of order > 25%

Resolution limited by Doppler shift and/or broadening

Target thickness increased up to factor 10 (detection cutoff, mult scatt’g)

J.S. Winfield, W.N. Catford and N.A. Orr, NIM A396 (1997) 147