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E07-006 Nucleon-Nucleon Short-Range Correlation

E07-006 Nucleon-Nucleon Short-Range Correlation. Outline. What is NN-SRC? Why is NN-SRC interesting? What has been done?. Our unique experiment. Very Preliminary Result. What is our analysis plan ? Our Installation & Preparation Pictures. What is NN-SRC?.

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E07-006 Nucleon-Nucleon Short-Range Correlation

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  1. E07-006 Nucleon-Nucleon Short-Range Correlation

  2. Outline • What is NN-SRC? • Why is NN-SRC interesting? • What has been done? • Our unique experiment. • Very Preliminary Result. • What is our analysis plan? • Our Installation & Preparation Pictures.

  3. What is NN-SRC? the phenomena are when the wave functions of the two nucleons are strongly overlapping

  4. Why should we care?

  5. Why is NN-SRC interesting? • The nuclear shell model can only predict 60% of the spectral function. Long range correlation can only provide a 20% contribution. The short range correlation is believed to contribute the remaining 20%. SPECTROSCOPIC STRENGTH Target Mass L. Lapikas, Nucl. Phys. A553 (1993) 297.

  6. Why is NN-SRC interesting? • The measurement of nucleon momentum distributions for various nuclei yields a similar high momentum tail. Along with the shell model, the existence of NN-SRC pairs within the nuclei is believed to explain this phenomenon.

  7. Why is NN-SRC interesting? • The study of the NN-SRCs within the nucleus also provides more insight into cold, dense nuclear matter such as that found in neutron stars.

  8. What Has been done?

  9. Inclusive Measurement r(A,3He) = a2n(A)/a2n(3He) CLAS A(e,e’) data • The observed scaling means that the electrons probe the high-momentum nucleons in the 2N-SRC phase, and the scaling factors determine the per-nucleon probability of the 2N-SRC phase in nuclei with A>3 relative to 3He K. Sh. Egiyanet al., Phys. Rev. C 68 (2003) 014313.

  10. Result (e,e’) and (e,e’p) • 80 +/- 5% single particles moving in an average potential • 60 – 70% independent single particle in a shell model potential • 10 – 20% shell model long range correlations • 20 +/- 5% two-nucleon short-range correlations • 18% np pairs • 1% pp pairs • 1% nn pairs (from isospin symmetry) • Less than 1% multi-nucleon correlations

  11. Correlated Pair Fractions from 12C R. Subediet al., Science320 (2008) 1476.

  12. Our Unique experiment

  13. Customized (e,e’pN) Measurement A pair with “large” relative momentum between the nucleons and small center of mass momentum Relative to the Fermi-sea level ~ 250 MeV/c • High Q2 to minimize MEC (1/Q2) and FSI • x>1 to suppress isobar contributions

  14. Experiment E07-006 vs E01-015 Tensor to Repulsive Core Missing momentum 400 – 800 MeV/c • Pushing Limits of NN Potential • Long range attraction • Short range repulsion

  15. E07-006: 4He(e,e’pN)pn SRC • 4He Target • Dense Nuclear Matter • Mean Feild& Exact Calculations • Pm from 400 – 800 MeV 4He pp/np Pmiss [MeV/c]

  16. Very Preliminary results

  17. 4He(e,e’p) TOF

  18. 4He(e,e’pp) TOF

  19. 4He(e,e’pn) TOF

  20. Our Analysis plan

  21. Working on detectors calibration as of the moment • The study of the triple reaction 4He(e,e’pN) will provide the ratio of the np to pp SRC-pairs in the high missing momentum region. • The analysis of the semi- inclusive 4He(e,e’N_recoiled) will investigate the possibility of studying the NN-SRCs without detecting the forward knocked-out proton. This will improve the statistics and simplify the future experimenal design. • The thorough examination of the cross section for A(e,e’pN), A(e,e’N_recoiled), A(e,e’p) will give an almost complete picture of the dynamics of the contribution from various reaction processes. • The analysis should be done in two year period.

  22. Acknowledgements • Spokespersons: • ShalevGilad (MIT) • Douglas Higinbotham (JLab) • Eli Piasetzky (Tel Aviv) • Vincent Sulkosky (MIT) • John Watson (Kent State) • Postdocs: • Aidan Kelleher (MIT) • Charles Hanretty (Uva) • Ran Shneor (Tel Aviv) • Graduate Students: • David Anez (Saint Mary’s) • Or Chen (Tel Aviv) • Igor Korover (Tel Aviv) • Navaphon(Tai) Muangma (MIT) • Larry Selvy (Kent State) • Zhihong Ye (Uva)

  23. Our Installation & Preparation Pictures

  24. BigBite Installation

  25. BigBite Installation

  26. HAND Installation

  27. LEAD wall Installation

  28. DAQ Installation

  29. The END

  30. Suppression of Non-SRC Two Body Effects • High Q2 to minimize MEC (1/Q2) and FSI • x>1 to suppress isobar contributions

  31. Jefferson Lab’s Hall A

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