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T. Adachi , P. von Brentano , D. Frekers , D. De Frenne , H. Fujita , Y. Fujita , A. Heger ,E. Jacobs , Y. Kalmykov , K. Langanke , E. Kolbe , A. Negret , P. von Neumann-Cosel ,
L. Popescu , S. Rakers , A. Richter , A. Shevchenko und Y. Shimbara
2 3 4 5 6 2 7
5 1 8 9 5 1
5 4 1 1 2
1 2 3 4
5 6 7 8 9TU Darmstadt — Osaka University — Universität zu Köln — Universität Münster
Universiteit Gent — University of Witwatersrand — Los Alamos — GSI — Universität Basel
Anatoliy ByelikovInstitut für Kernphysik, Technische Universität Darmstadt
Neutrino Nucleosynthesis of ExoticNuclides La and Ta138 180
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Motivation
Theoretical predictions
Experimental requirements and setup
Results vs. RPA calculations
Summary and outlook
Outline
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180Ta
138La
Exotic Nuclides
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Nucleosynthesis of 138La
s-process r-process p-process
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Production through Neutrino Process
Neutral current reactions: 139La(,‘n)138La 181Ta(,‘n)180Ta
Charged current reactions: 138Ba(e,e)138La 180Hf(e,e)180Ta
Complete stellar evolution in massive stars with the improved RPA calculations for -nucleus reactions
A. Heger et al., Phys. Lett. B 606 (2005) 258
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138La: pure process nucleus
Different Production Processes of 138La
180Ta: 50% p process, 50% process (s process also not excluded)
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Prediction
Low neutrino energies small q l = 0 GT strength RPA predicts main GT resonance well above neutron threshold
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Experimental Requirements
(e,e) Gamow-Teller strength (p,n) or (3He,t)
Gamow-Teller part Narrow angle cut around 0°
Simple one step reaction mechanism Intermediate energies
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Experimental Facility at RCNP
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Grand Raiden
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138La Spectrum
Target: 138BaCO4 embedded in polyvinylalcohol
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B(GT) extraction
B(GT))(0JNK)σ(02
στστ
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GT Strength Distribution in 138La
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Comparison Experiment/RPA
B(GT–)exp 64% B(GT–)th at 7.47 MeV
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180Ta Spectrum
Target: 180TaO2 embedded in polyvinylalcohol
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GT Strength Distribution in 180Ta
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Summary and Outlook
Analysis of 138La and 180Ta data completed
Good agreement found for 138La
Comparison with the theory for 180Ta underway
Integration into network calculations underway
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PVA Spectrum
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Nucleon-Nucleon Interaction: Ein Dependence at q = 0
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Production of 180Ta
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R2 Value
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High Resolution WS Course
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Conversion to B(GT)
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