„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 energywith highest efficiency

d e t e c t o r s

FRS

thoughtsby Thomas Faestermannbased on two 100Sn experiments

Beta decay

Requirements for “clean” Gamov-Teller -transition

good shell model nucleus

valence nucleon can decayto spin-orbit partner shell of unlike nucleon

large Q-value, in orderthat most of the strengthis accessible in -decay

Measurement of the Gamov-Teller-strength

Fragment Separator at GSI

Fragment identification

Implantation detector

detector types

Implantation profile

Implantation detector

100Sn event in Super-Clover

Total: 2780 keV

Segmentsincreased by ~ 10%

Half-life of 102Sn

Decay scheme of 102Sn

Beta decay of 102Sn

Gamov-Teller strength of Sn isotopes

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

100Sn is still a challenge

Production cross sections

Energy calibration of the implantation detector

readout for implantation

readout for decay