MKaczmarski 1 K Czerski 12 N TargoszSleczka 1 P Heide 2 A Huke 24 D Weissbach 4 and G Ruprecht 34 1 University of Szczecin Poland 2 Technical University Berlin Germany ID: 810497
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Slide1
New Results for Enhanced Electron Screening in the Deuteron Fusion Reactions
M.Kaczmarski1, K. Czerski1,2, N. Targosz-Sleczka1, P. Heide2 , A. Huke2,4 , D. Weissbach4 and G. Ruprecht3,4 1 University of Szczecin, Poland2 Technical University Berlin, Germany3 TRIUMF, Vancouver, Canada4 Institute for Solid-State Nuclear Physics, Berlin, Germany
1
Slide2Z
1 Z2 e 2rIntroduction- Electron Screening EffectP(E)P(E+Ue)
strong screening
Wigner-Seitz Radius
2
V
(
r
) =
exp (-
r /a
)
Z
1
Z
2
e
2
r
≈
-
U
e
U
e
=
Z
1
Z
2
e
2
a
Slide3Experimental Results for HV
d + d3He + nd + d 3H + p3metal target:
NIC 1998, p. 152
Europhys. Lett. 54 (2001) 449
Similar results:
J. Kasagi et al., J.Phys.Soc.Jap. 71 (2002) 2281
F. Raiola et al., Eur.Phys.J. A13 (2002) 337
F. Raiola et al., Eur.Phys.J. A19 (2004) 283
gas target
:
U
e
= 25
±5
eV
U.Greife et al., Z.Phys. A351 (1995) 107
Slide4Experimental Results for HV
electron-gas parameter rs4dielectric function theory: free and bound electron polarization cohesion screeningPhys. Rev. C 2008
Slide5ECR ion source
analyzingmagnetelectron detectortarget chambermassspectrometerI: 10-30 µAV: 30 kVV:
~ 1 V
p
:
10
-11
– 10
-10
mbar
5
UHV Experimental Setup
Slide6Experimental results for UHV
6with LN2 coolingpH2O ~ 5x10-12 mbarTarget contaminationP~ 8x10-10 mbar
Slide7C
OcO
Zr
electron beam 1 keV
electron beam 3 keV
N
ew
7
Auger Spectroscopy Results
Old
Slide8NEW RESULTS FOR UHV EXPERIMENT
Time Dependency of Screening EffectCrystal structure Damage couse of increasing electron effective mass8P~2x10-10 mbar
Slide9Effective Electron Mass
9crystal lattice defects effective electron mass > me
Slide10Summary
10UHV screening energies larger than previous valuesTheoretical values much smaller, but the target material dependence can be explained – renormalization factor ? Crystal defects increase the effective electron massNew UHV accelerator under construction at the University of Szczecin
Slide11Auger Spectroscopy
11
vacuum level
e
-
creation of vacancy
de-excitation
Roentgen fluorescence
Auger process
L
2,3
K
L
1
E
= E
K
- E
L1
E
e
= E
K
- E
L1
- E
L2