1. Neutrino-Nucleus Reactions at Medium and Low Energies [contents] 1. Neutrino and weak interaction 2. Cross section for ν-A and e-A reactions 3. EMC effect 4. My study 5. Summary Dec.18, 2003 physics colloquium Ⅱ Hirofumi Nema (Shibata Laboratory) 99-1890-0

2. 1. Neutrino and weak interaction Neutrino and charged lepton make a pair. leptons elementary particles : hadrons, leptons, gauge particles particle anti- particle

3. charged current neutral current + + + + boson Weak interaction Electromagnetic ++ a virtual photon Electron beam and Neutrino beam interaction

4. 2. Cross section for ν-A and e-A reactions ν-A cross section is much smaller than e-A cross section. e-A reactionν-A reaction O (e, e’) 1080 MeV Energy ( Gev ) 1 CC quasi elastic

5. : Bjorken scaling variable D: deuteron Ca 3. EMC effect e( )-A reaction is different from e( )-N reaction. momentum fraction carried by a quark (They are approximately free nucleons.) 1 proton, 1 neutron (They are bound) 20 protons, 20 neutrons /

6. Effect of vector meson A part of EMC effect may be due to hadronic component of the virtual photon, not due to the structure of the target nucleus. q q (,, ) nucleus Is ν-A reaction different from ν -N reaction ?

7. my study ・ collect experimental data of e-A and ν-A reactions ・ build a model for these reactions 4. My study Overall study of ν-A and e-A reactions If e-A data and ν-A data are combined, we can understand ν-A reactions better. There are large amounts of data available on e-A reactions.

8. 5. Summary In weak interaction or is exchanged. ・ In electromagnetic interaction a virtual photon is exchanged. ・ ν-A cross section is much smaller than e-A cross section. ・ The structure of nucleus can be studied with electron scattering and neutrino scattering. ・ e-A reaction is different from e-N reaction ( EMC effect ). A part of EMC effect may be due to hadronic component of the virtual photon. ・ If e-A data and ν-A data are combined, we can understand ν-A reactions better. ・ I collect experimental data of ν-A reactions and build a model for these reactions.