e07 006 nucleon nucleon short range correlation n.
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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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outline
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
What is NN-SRC?

the phenomena are when the wave functions of the two nucleons are strongly overlapping

why is nn src interesting
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.

why is nn src interesting1
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.
why is nn src interesting2
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.
inclusive measurement
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.

result e e and e e p
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
slide11

Correlated Pair Fractions from 12C

R. Subediet al., Science320 (2008) 1476.

slide13

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
slide14

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
slide15

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]

slide21

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.
slide22

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)
slide35

Suppression of Non-SRC Two Body Effects

  • High Q2 to minimize MEC (1/Q2) and FSI
  • x>1 to suppress isobar contributions