Beta and particle decay spectroscopy at the Super FRS Zenon Janas Nuclear Spectroscopy Division Warsaw University
Branches of the Super FRS High-Energy Branch H. Weick, M. Winkler
Regions of interest • heavy proton emitters 197 Fr 1 atom / s • 100 Sn region • r- process nuclei 100 Sn 2 atoms / s 132 Sn 10 8 atoms / s 78 Ni 8 atoms / s K.-H. Schmidt
Heavy proton emitters α - emitters predicted p - emitters 91 207 Pa 209 Pa 89 201 Ac 203 Ac Q p (MeV) 0.8 1.0 1.2 1.4 1.6 1.8 2.0 10 2 10 1 87 197 Fr 207 Pa p 10 0 10 -1 T 1/2 (s) 10 -2 α 10 -3 10 -4 Experimental knowledge 10 -5 10 -6 10 -7 8.2 8.4 8.6 8.8 9.0 9.2 9.4 Q α (MeV)
Detection of fast p and α decays implantation ⇔ range focusing position correlation ⇔ high granularity time correlation ⇔ dedicated electronics Identified ions PA DSSD
Studies of r - process nuclei • masses (Q β , S n ) • β - decay halflives β - strength distribution • β n emission probabilities 20 A=121 18 Q β 16 Energy (MeV) 14 12 10 8 6 S n (Z+1) 4 2 Zr Y Ag Pd Rh Ru Tc Mo Nb 0 74 75 76 77 78 79 80 81 82 83 Neutron number
High - resolution β n and βγ -ray measurements . t e d - Identified n ions γ - det . β - particle tracking segmented β - detectors
Total Absorption Spectrometer Transport tape β – detectors NaI(Tl) ∅ 14 ″ × 14 ″ PMT Σ ε ph = 70% at 1 MeV TAS energy
Total absorption vs. high-resolution measurements 0.10 98 Ag TAS Feeding (% / keV) 0.08 CLU 0.06 0.04 0.02 Q EC 6 × Cluster detectors 0.00 0 1 2 3 4 5 6 7 8 ε γ = 19 % at 1.3 MeV Energy (MeV)
Total Absorption Spectroscopy at Super FRS Transport tape extraction system β – dets . NaI(Tl) ∅ 14 ″ × 14 ″ PMT Super FRS Σ gas cell TAS energy
Possible contribution of the Warsaw group • setup for µ s - decay studies - dedicated preamplifiers - digital signal processing • setup for Total Abs. Spectroscopy measurements • ion catcher (EU RTD Network) - gas flow simulations
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