1. Neutrino Reaction in Nuclear-Astro Physics
Myung-Ki Cheoun
Department of Physics,
Soongsil University
K.S.Kim, W.Y.So, S.Y. Lee, C. Ryu…
T.Yoshida,T.Kajino, M.Mattheus

2. Contents 0. Single and Double Beta Decay
1. Motivation for ν-processes in Nucleosynthesis
2. Indirect (Multi-step or Compound nuclei)
and
Direct (One-step or Knock-out) Processes
for ν-12C
3. Results and Summary
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3. Beta Beam
Zuccheli has first proposed the idea of producing electron (anti)neutrino beams using the beta-decay of boosted radioactive ions : the “beta-beam”.
In the original scenario, the ions are produced, collected, accelerated up to several tens of GeV/nucleon….
The neutrino beam is produced by the decaying ions, points to a water Cerenkov detector..
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4.
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5. Nucleosynthesis of Solar System
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6. Diff = 107 Chondrites are stony meteorites that have not been modified
왜 금 1킬로그램이 철 1킬로 그램보다 훨씬 비쌀까?
10^7 (철이 1000만 배 더 많음)
Chondrites are stony meteorites that have not been modified
due to melting or differentiation of the parent body
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7. Solar system Supernovae Model BIG-BANG STARS COSMIC-RAYS SUPERNOVAE ?
R-PROCESS
　　　　　 AGB STARS
　　　　　　　　　　　　　　　　　S-PROCESS R
S（N=50) R
S（N=82)
S（N=126) R
Actinide
COSMIC-RAYS ++ +
232Th (14.05Gy) P
238U (4.47 Gy)
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SPERNOVA-g PROCESS ?

8. r-process rp-process s-process
Without understanding the exotic nuclei,
Mission impossible is to trace
the evolution of the universe
in its hadron stage !!
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9. Nucleosynthesis of Other Stars
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10.
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11.
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12.
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13. Big Bang Nucleosynthesis
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14.
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15. Prediction and Observation by SBBN
SBBN: Parameter is baryon-to-photon ratio h
→ WMAP Constraint of h
h=(6.14±0.25)×10-10
(Spergel et al. 2003)
WMAP
Li problem!
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Coc et al. (2004)

16.
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17.
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18. Contents Motivation for ν-processes in Nucleosynthesis
2. Indirect (Multi-step or Compound nuclei)
and
Direct (One-step or Knock-out) Processes for ν-12C
3. Results and Summary
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19. Typical cross section by incident electron
Giant Resonance
Delta Resonance
Quasi Elastic Region
Hadronic Region
energy
N* Resonance
Dip Region
Discrete
Excited states
Pion Threshold q
Typical cross section by incident electron
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20. Indirect (Multi-step) Processesν’
Indirect (Multi-step) Processes ν
W(+,-), Z0
p,n,… A* A B
J ∏ A* A
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21. Direct (One-step) Processesν’
p,n,… ν
W(+,-), Z0 A B
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22. Indirect Processes by QRPA
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23. QRPA The description of an operator, Ôλ, in the QRPA formalism
nuclear model independent part
nuclear model dependent part
Quasi-Boson approximation (QBA)
QRPA ground state =|QRPA>≈|BCS> : BCS vacuum
QRPA excited state =|ω, JM> : 1 or 2 quasi-particle states to the BCS ground state
phonon operator
|a> and |b> are the single particle state
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24. Calculation and Method
The differential neutrino-nucleus cross section takes the form
Structure functions
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25.
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26. Direct Processes by Distorted Wave Born Approximation
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27. Neutrino-nucleus (12C) scattering
The differential cross section is given by
: mass of nucleon
: mass of residual nucleus
: mass of target nucleus
: helicity for neutrino (antineutrino)
The recoil factor is given by
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28. and corresponding structure functions are given by
with
The total cross section
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29.
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30.
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31. Total cross section (CC reaction)
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32. Summary 1
In this work, we present how to include multipole transitions between ground and excited states in our QRPA code by using Donnelly's multipole operator method for nuclear interactions. We showed a preliminary result obtained by this method, and applied to the ν reaction with 12C nuclei.
We are going to apply our method to another nuclei, Mg and Al series, and also for medium and heavy nuclei, i.e. Fe, Co and Ni series, and La and Ta series, which are known to play very important roles in the ν and rapid proton processes for nucleosynthesis.
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33. Summary 2
Contribution by Direct processes for BBN nucleosynthesis are smaller 2-4 times than those by Indirect Processes with Final state interactions.
But, Indirect Processes need to be checked carefully in the aspect of final state interaction between outgoing particles and residual nuclei. Direct reaction could be comparable to those by Indirect Processes.
Abundances of 7Li might be changed by the contribution of Direct Processes. It may lead to different results for the information of neutrino deduced from the BBN, such as neutrino masses and oscillation parameters.
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34. Thanks for your attention
and
for LOC !!
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