„the perfect stopped beam experiment“ clean fragment separation unique fragment identification...
Post on 22-Dec-2015
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„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
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Beta decay
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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
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Measurement of the Gamov-Teller-strength
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Fragment Separator at GSI
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Fragment identification
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Implantation detector
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detector types
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Implantation profile
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Implantation detector
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100Sn event in Super-Clover
Total: 2780 keV
Segmentsincreased by ~ 10%
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Half-life of 102Sn
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Decay scheme of 102Sn
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Beta decay of 102Sn
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Gamov-Teller strength of Sn isotopes
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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
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Production cross sections
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Energy calibration of the implantation detector
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readout for implantation
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readout for decay