1. „the perfect stopped beam experiment“ clean fragment separation   unique fragment identification  A, Z fragment position  x, y, z decay radiation  position correlation for , p, conv. electron (not for isomeric  ) precise energy with highest efficiency d e t e c t o r s FRS thoughts by Thomas Faestermann based on two 100 Sn experiments

2. Beta decay

3. Requirements for “clean” Gamov-Teller  -transition good shell model nucleus valence nucleon can decay to spin-orbit partner shell of unlike nucleon large Q-value, in order that most of the strength is accessible in  -decay

4. Measurement of the Gamov-Teller-strength

5. Fragment Separator at GSI

6. Fragment identification

7. Implantation detector

8. detector types

9. Implantation profile

10. Implantation detector

11. 100 Sn event in Super-Clover Total: 2780 keV Segments increased by ~ 10%

12. Half-life of 102Sn

13. Decay scheme of 102Sn

14. Beta decay of 102Sn

15. Gamov-Teller strength of Sn isotopes

16. Conclusions correlation of decay with implanted fragment gives clean spectra this requires fine 3 dim. position of fragment and decay highest efficiency and energy resolution for all detectors 100 Sn is still a challenge

18. Production cross sections

19. Energy calibration of the implantation detector

20. readout for implantation

21. readout for decay