1. KEK SRC Workshop Sept 25, 2009 KEK Theory Center Workshop on Short-range Correlations and Tensor Structure at J-PARC September 25, 2009 Search for Direct Evidence of Tensor Interaction via (p,d) Reaction Hooi Jin, ONG Research Center for Nuclear Physics (RCNP) Osaka University

2. KEK SRC Workshop Sept 25, 2009 Tensor Interactions in Atomic Nuclei  Tensor interactions  Fundamental nuclear interactions that provide attractive force  Caused by pion exchange  Evidences of tensor interactions  Admixtures of D-wave in d,   Deviation of magnetic moments (of double- closed+1 nuclei) from the Schmidt values  Varying magic numbers in neutron-rich nuclei

3. KEK SRC Workshop Sept 25, 2009 one of the hot topics in nuclear physics Possible role of tensor interactions in changing the spin-orbit splitting...  Varying magic numbers in neutron-rich nuclei: T. Otsuka et al, PRL95, 232502(2005)

4. KEK SRC Workshop Sept 25, 2009 But thus far the “evidences” from nuclei heavier than d and  are indirect… Is “direct” evidence on the tensor interactions possible, experimentally? Tensor interactions: Intermediate range Mean field

5. KEK SRC Workshop Sept 25, 2009 Theoretical Momentum Distribution W. Horiuchi and Y. Suzuki, PRC76, 024311(2007) T. Neff and H. Feldmeier, NPA713, 311(2003) R. Schiavilla et al., PRL 98, 132501 (2007)  +N+N model pn pair (lines) pp pair (symbols)

6. KEK SRC Workshop Sept 25, 2009 How to measure high momentum components? (e,e'p), (e,e'pp), (e,e'pn), etc. (p,2p), etc.

7. KEK SRC Workshop Sept 25, 2009 (p,d): Selective measurement of high momentum components ‡ G. W. Bennett et al., PRL19, 387(1967) † K. Sekiguchi et al., PRL95, 162301(2004) + Measurement for quasi-free (p,pd) reaction E p = 1GeV

8. KEK SRC Workshop Sept 25, 2009 Subjects of Study: 12 C and 16 O Selection Rule:  J =0,  L =  S =2 Measure the internal momentum, in particular, the High Momentum Component

9. KEK SRC Workshop Sept 25, 2009 Momentum Transfer  Cover momentum transfer at around 2 fm -1 (394 MeV/c)  =0° (p+ 12 C) -> d+ 11 C  =15° (p+ 12 C) -> d+ 11 C  =30° (p+ 12 C -> d+ 11 C)  =0° (p+ 12 C) -> p+d+ 10 B

10. KEK SRC Workshop Sept 25, 2009 Experiment Setup Target d p RCNP Grand RAIDEN ΘdΘd

11. KEK SRC Workshop Sept 25, 2009 Online Data: 16 O Target States in 15 O 16 O (p,d) E p = 392 MeV Θ d = 10°

12. 12 C (p,d) E p = 198 MeV Θ d = 10° 12 C (p,d) E p = 392 MeV Θ d = 20° Online Data: 12 C Target

13. KEK SRC Workshop Sept 25, 2009 Online Data: (p,pd) channel deuteron-proton coincidence events. Ed [MeV] 14 N ground state Ep [MeV]

14. KEK SRC Workshop Sept 25, 2009 12 C (p,d) E p = 198 MeV Θ d = 10° 12 C (p,d) E p = 295 MeV Θ d = 10° 12 C (p,d) E p = 392 MeV Θ d = 10° 11 C Level scheme 3/2 - 0.0 positive-parity states

15. 16 O (p,d) E p = 198 MeV Θ d = 10° 16 O (p,d) E p = 295 MeV Θ d = 10° 16 O (p,d) E p = 392 MeV Θ d = 10° 15 O Level scheme 1/2 - 0.0 positive-parity states

16. KEK SRC Workshop Sept 25, 2009 Summary (p,d) and (p,pd) reactions on 12 C and 16 O targets have been measured with the Grand RAIDEN spectrometer at RCNP, Osaka Univ., using proton beam at energies 198, 295, 392 MeV. Reaction involving high-momentum components has been observed.

17. KEK SRC Workshop Sept 25, 2009 Acknowledgment RCNP I. Tanihata, A. Tamii, H. Okamura, M. Yosoi, T. Suzuki, K. Hirota, T. Naito, H. Matsubara, J. Zenihiro, Y. Yasuda, T. Adachi, Y. Tameshige, K. Suda, D. Ishikawa, H. Toki, T. Myo, Y. Ogawa Dep. of Phys., Osaka Univ. K. Matsuta, M. Fukuda, M. Mihara, D.Nishimura Miyazaki Univ. H. Sakaguchi Kyoto Univ. T. Kawabata Tsukuba Univ. A. Ozawa RIKEN Nishina Center K. Sekiguchi, K. Ikeda Nara Women’s Univ. M. Taniguchi RCNP I. Tanihata, A. Tamii, H. Okamura, M. Yosoi, T. Suzuki, K. Hirota, T. Naito, H. Matsubara, J. Zenihiro, Y. Yasuda, T. Adachi, Y. Tameshige, K. Suda, D. Ishikawa, H. Toki, T. Myo, Y. Ogawa Dep. of Phys., Osaka Univ. K. Matsuta, M. Fukuda, M. Mihara, D.Nishimura Miyazaki Univ. H. Sakaguchi Kyoto Univ. T. Kawabata Tsukuba Univ. A. Ozawa RIKEN Nishina Center K. Sekiguchi, K. Ikeda Nara Women’s Univ. M. Taniguchi RCNP-E314 collaborators:

18. Thank you very much for your attention! Acknowledgment Thank you very much for the invitation and financial support! The organizers & KEK Theory Center