Beta and particle decay spectroscopy at the Super FRS Zenon - - PowerPoint PPT Presentation

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

100Sn

2 atoms / s

78Ni

8 atoms / s

132Sn

108 atoms / s

• heavy proton emitters
• 100Sn region
• r- process nuclei

K.-H. Schmidt

197Fr

1 atom / s

Heavy proton emitters

207Pa 209Pa 201Ac 203Ac 197Fr

10-7 10-6 10-5 10-4 10-3 10-2 10-1 100 101 102 0.8 1.0 1.2 1.4 1.6 1.8 2.0

Qp(MeV)

207Pa

Qα(MeV)

8.2 8.4 8.6 8.8 9.0 9.2 9.4

α

p

T1/2 (s)

α- emitters predicted p - emitters

91 89 87

Experimental knowledge

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 (Qβ, Sn)
• β - decay halflives

β - strength distribution

• βn emission probabilities

74 75 76 77 78 79 80 81 82 83 2 4 6 8 10 12 14 16 18 20

Sn(Z+1)

Qβ

A=121

Y Tc

Nb

Mo Zr Ru Rh Pd Ag

Energy (MeV) Neutron number

High - resolution βn and βγ-ray measurements

n

• d

e t .

Identified ions

γ - det.

β - particle

tracking segmented β - detectors

Total Absorption Spectrometer

Σ Transport tape β – detectors PMT NaI(Tl)

∅ 14″ × 14″

TAS energy

εph= 70% at 1 MeV

Total absorption vs. high-resolution measurements

1 2 3 4 5 6 7 8 0.00 0.02 0.04 0.06 0.08 0.10

Feeding (% / keV) Energy (MeV)

QEC

98Ag

TAS CLU

6 × Cluster detectors εγ = 19 % at 1.3 MeV

Total Absorption Spectroscopy at Super FRS

Σ NaI(Tl)

∅ 14″ × 14″

Transport tape extraction system β – dets. PMT

Super FRS

gas cell

TAS energy

Possible contribution of the Warsaw group

• setup for µs - decay studies
• dedicated preamplifiers
• digital signal processing
• setup for Total Abs. Spectroscopy measurements
• ion catcher (EU RTD Network)
• gas flow simulations