LABORATORY FOR RADIOCHEMISTRY AND ENVIRONMENTAL CHEMISTRY ... · LABORATORY FOR RADIOCHEMISTRY AND...
Transcript of LABORATORY FOR RADIOCHEMISTRY AND ENVIRONMENTAL CHEMISTRY ... · LABORATORY FOR RADIOCHEMISTRY AND...
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LABORATORY FOR RADIOCHEMISTRY AND ENVIRONMENTAL CHEMISTRY OF THE UNIVERSITY OF
BERN AND THE PAUL SCHERRER INSITUTE
S. Soverna, March 2002
1 Department for Chemistry and Biochemistry, University of Bern, Switzerland2 Paul Scherrer Institute, Villigen, Switzerland
S. Soverna1,2, R. Dressler2, Ch.E. Düllmann1,2, B. Eichler2,
R. Eichler1,2, H.W. Gäggeler1,2, D. Piguet2, A. Türler1,2
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LABORATORY FOR RADIOCHEMISTRY AND ENVIRONMENTAL CHEMISTRY OF THE UNIVERSITY OF
BERN AND THE PAUL SCHERRER INSITUTE
S. Soverna, March 2002
112 behaves like a noble gas:
• Very volatile
• Only Van der Waal interactions with metallic surfaces
Literature: K.S. Pitzer, J. Chem. Phys. 63, 1032 (1975)
112 behaves like a noble metal:
• Very volatile
• Interacts like a metal
Literature: B. Eichler, Kernenergie 10, 307, 1976
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LABORATORY FOR RADIOCHEMISTRY AND ENVIRONMENTAL CHEMISTRY OF THE UNIVERSITY OF
BERN AND THE PAUL SCHERRER INSITUTE
S. Soverna, March 2002
COLD temperature gradient: +25 °C to -180 °C
48Ca-beam
238U-target
Recoil chamber
He HeThermostats
ryo n- ine etectorryo n- ine etector
2 x 32 PIN diodes
PIN diodes withAuAu surfaces
Oven(850 °C)
SiO2- column with Pt-foil
N2 (liq.)(-196 °C)
PIN diodes withSiO2SiO2 surfaces
(+25 °C)(+25 °C)
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LABORATORY FOR RADIOCHEMISTRY AND ENVIRONMENTAL CHEMISTRY OF THE UNIVERSITY OF
BERN AND THE PAUL SCHERRER INSITUTE
S. Soverna, March 2002
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LABORATORY FOR RADIOCHEMISTRY AND ENVIRONMENTAL CHEMISTRY OF THE UNIVERSITY OF
BERN AND THE PAUL SCHERRER INSITUTE
S. Soverna, March 2002
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LABORATORY FOR RADIOCHEMISTRY AND ENVIRONMENTAL CHEMISTRY OF THE UNIVERSITY OF
BERN AND THE PAUL SCHERRER INSITUTE
S. Soverna, March 2002
COLD temperature gradient: +25 °C to -180 °C
48Ca-beam
238U-target
Recoil chamber
He HeThermostats
ryo n- ine etectorryo n- ine etector
2 x 32 PIN diodes
PIN diodes withAuAu surfaces
Oven(850 °C)
SiO2- column with Pt-foil
N2 (liq.)(-196 °C)
PIN diodes withSiO2SiO2 surfaces
(+25 °C)(+25 °C)
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LABORATORY FOR RADIOCHEMISTRY AND ENVIRONMENTAL CHEMISTRY OF THE UNIVERSITY OF
BERN AND THE PAUL SCHERRER INSITUTE
S. Soverna, March 2002
20Ne-beam
168Yb-target
Recoil chamber
He HeThermostat
(0 °C)Oven(850 °C)
SiO2- column with Pt-foil
N2 (liq.)(-196 °C)
PIN diodes withSiO2SiO2 surfaces AuAu( -plates opposite
PIN diodes)
2π-detection
SiO2SiO2
0 cm
-165 °C
Temperature gradient
180-182Hg (αααα)0 °C
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LABORATORY FOR RADIOCHEMISTRY AND ENVIRONMENTAL CHEMISTRY OF THE UNIVERSITY OF
BERN AND THE PAUL SCHERRER INSITUTE
S. Soverna, March 2002
Nuclear reaction: 238U(48Ca,3n)283112*
sf (T1/2 ≈ 3 min)
Over all efficiency of IVO: 50 %
Average beam intensity: 1 pµA
Target thickness: 1 mg/cm2
Expected production cross section 1 pb
4 detected 283112 fission events per week4 detected 283112 fission events per week
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LABORATORY FOR RADIOCHEMISTRY AND ENVIRONMENTAL CHEMISTRY OF THE UNIVERSITY OF
BERN AND THE PAUL SCHERRER INSITUTE
S. Soverna, March 2002
48Ca-beam
238U-target
Recoil chamber
He He
PIN diodes with PIN diodes withSiO2SiO2 AuAu surfacessurfaces
Oven(850 °C)
SiO2- column with Pt-foil
N2 (l)(-196 °C)(+25 °C)(+25 °C)
COLD temperature gradient: +25 °C to -180 °C
Thermostats
0 cm 36 cm
+25 °C
-180 °C
180-182Hg (αααα) Rn (αααα)Rn (αααα)283112 (sf)
283112 (sf)
?? ??
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LABORATORY FOR RADIOCHEMISTRY AND ENVIRONMENTAL CHEMISTRY OF THE UNIVERSITY OF
BERN AND THE PAUL SCHERRER INSITUTE
S. Soverna, March 2002
H.U. Aebersold , R. Dressler, Ch.E. Düllmann, B. Eichler, R. Eichler, H.W. Gäggeler, D. Piguet, L. Tobler, A. Türler
A.B. Yakushev
Z. Qin