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Outline. Motivation Theoretical predictions Experimental requirements and setup Results vs. RPA calculations Summary and outlook. Exotic Nuclides. Nucleosynthesis of 138 La. s-process. r-process. p-process. Production through Neutrino Process. - PowerPoint PPT Presentation
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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
Motivation
Theoretical predictions
Experimental requirements and setup
Results vs. RPA calculations
Summary and outlook
Outline
180Ta
138La
Exotic Nuclides
Nucleosynthesis of 138La
s-process r-process p-process
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
138La: pure process nucleus
Different Production Processes of 138La
180Ta: 50% p process, 50% process (s process also not excluded)
Prediction
Low neutrino energies small q l = 0 GT strength RPA predicts main GT resonance well above neutron threshold
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
Experimental Facility at RCNP
Grand Raiden
138La Spectrum
Target: 138BaCO4 embedded in polyvinylalcohol
B(GT) extraction
B(GT))(0JNK)σ(02
στστ
GT Strength Distribution in 138La
Comparison Experiment/RPA
B(GT–)exp 64% B(GT–)th at 7.47 MeV
180Ta Spectrum
Target: 180TaO2 embedded in polyvinylalcohol
GT Strength Distribution in 180Ta
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
PVA Spectrum
Nucleon-Nucleon Interaction: Ein Dependence at q = 0
Production of 180Ta
R2 Value
High Resolution WS Course
Conversion to B(GT)