1. Prompt and Delayed Conversion Electron Spectroscopy of Heavy Nuclei Andreas Heinz A. W. Wright Nuclear Structure Laboratory Yale University ATLAS Workshop, August 8-9, 2009

2. Prompt Conversion Electron Spectroscopy 253 No R.-D. Herzberg et al., EPJA (2009) P. A. Butler et al., PRL 89, 202501 (2002) 254 No SACRED

3. Solenoids and Mini Oranges ICEBall M.P. Metlay et al., NIM A 336, 162 (1993) → low detection efficiency below 200 keV. → threshold is too high for heavy nuclei. J. Andrzejewski et al., NIM A 585, 155 (2008) Solenoid spectrometers with superconducting (Super-e, SACRED), and normal-conducting coils (SAGE), as well as with permanent magnet guides exist.

4. Needs for Heavy Nuclei High detection efficiency also at low energies. e-gamma, e-e, gamma-gamma correlations; i.e. a spectrometer coupled to GAMMASPHERE/GRETINA. Channel selection (coupled to FMA) Usable at high beam currents.

5. Complex Alpha Decay Spectra GSI 257 Rf 253 No α ICE α DSSD Recoil ICE Spectra are distorted by summing of alpha and conversion electron signals! But: we get the sum energy of a converted decay cascade! G. D. Jones, NIM A 488, 471 (2002)

6. Ranges SRIM 25 μ m at 50 keV

7. Needs for Delayed Conversion Electrons High detection efficiencies and resolution - especially at low electron energies. Alpha-electron coincidences Electron-gamma coincidences e spectrometer? Recoils Catcher (active?) Ge Degrader (active?) M. Asai et al., PRL 95, 102502 (2005) 253 Fm