neutrino-nucleus reaction at low energy and resonance region (d
TRANSCRIPT
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Neutrino-nucleus reaction at low energy and resonance region (dynamical model)
T. Sato (Osaka U.)
Collaborators: B. Szczerbinska, K. Kubodera, T.-S. H. Lee
H. Kamano, Y. Ikeda
Neutrino reaction on the resonance region
Attempts to construct nuclear current for low energy nuclear elctroweak
reaction from EFT
Feb 2007 RCNP
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Electroweak meson production reaction-- resonance region --
Resonance region 1 < W < 2 GeV
1GeV lepton reaction mainly Delta(1232), single pion production
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Electroweak meson production in delta(1232) region
SL (PRC ‘96,’01,’03,’04)
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Proton structure function
SL model has been tested (e,e’ pi) cross section, polarization, photoproduction
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Comment 1: SL model and MAID (e,e’) reaction
MAID Unitary Isobar Model
Virtual photon-pion production cross section for proton and neutron
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Neutrino reaction (SL model)
dynamical model of weak pion production reaction
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Neutrino-Nucleus reaction
Inclusive neutrino-nucleus reaction for GeV neutrino
Hadron tensor
Nuclear correlation: structure function P(p,E) from Benhar
Nuclear effects on Delta propagator delta hole model
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Comment 2: Prescription for off-shell nucleon
Our calculation
Effective energy transfer
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Neutrino (CC) electron
E ~ 1GeV, Q^2 ~ 0.4GeV/c^2
Lepton + 12C -> X
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Comment 3: Resonance region 1.4 < W < 2GeV
Feature:
Multi-channel and multi-resonance problem
Simultaneous study of
strong and electromagnetic probe
and
inelastic final states
Exited Baryon Analysis Center at Jlab (EBAC)
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First results from EBAC
B. Julia-Diaz,A. Matsuyama, T.-S. H. Lee, T.S.
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Low energy neutrino reaction and EFT
Low energy electroweak reaction for a few nucleon system
Solar neutrino, supernova E < 50MeV
E ~ keV - MeV
Predict neutrino reaction cross section for a few nucleon system
high precision N-N interaction + Nuclear Current
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Standard nuclear physics approach and effective field theory
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Nuclear Current = One-body(IA) + Many-body(EXC)
Many-body current has to be tested
SNPA and EFT* agree well within a few per cent
precise nuclear current for low energy reaction is available
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Comment 4:
Mechanism for Vector current (M1) .neq. Axial vector current (GT)
Magnetic dipole transition: vector
Gamow-Teller transition: axial vector
~10%
~2-3%
EXC for cross section
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summary
Resonance region
Dynamical model of electroweak pion production reaction for delta region
Is developped and applied for inclusive nuclear reaction
Model for higher energy resonance region W<2GeV is in progress
Low energy region
SNPA and EFT approaches provide precise description for low energy
Electroweak reaction of a few nucleon system