Search for three-nucleon short-range correlations in light nuclei

Three nucleon short range correlations (SRCs) are one of the most elusive structures in nuclei. Their observation and the subsequent study of their internal makeup will have a significant impact on our understanding of the dynamics of super-dense nuclear matter which exists at the cores of neutron stars. We discuss the kinematic conditions and observables that are most favorable for probing 3N-SRCs in inclusive electro-nuclear processes and make a prediction for a quadratic dependence of the probabilities of finding a nucleon in 2N-and 3N-SRCs. We demonstrate that this prediction is consistent with the limited high energy experimental data available, suggesting that we have observed, for the first time, 3N-SRCs in electro-nuclear processes. Our analysis enables us to extract a3(A, Z), the probability of finding 3N-SRCs in nuclei relative to the A=3 system.

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“…[8]. However it was not confirmed by subsequent measurements [9,27]. The source of this disagreement has been traced to the poor reso-FIG.…”

Section: Three Nucleon Short Range Correlations (3n-srcs)mentioning

confidence: 89%

Searching for three-nucleon short-range correlations

et al. 2019

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“…Measurements of two-nucleon knockout, where both nucleons from the SRC are observed in the final state, showed dominance of np-SRC, which was later confirmed in additional nuclei for A(e, e p) [257] and through inclusive measurements taking advantage of the target isospin structure in 48 Ca/ 40 Ca ratios [258]. Finally, measurements at x > 2 tried to establish the presence of three-nucleon SRCs (3N-SRCs), but low-Q 2 measurements did not observe 3N-SRC dominance [259], and higher-Q 2 data was consistent with 3N-SRC dominance but had extremely limited statistics [254].…”

Section: Short Range Nn Correlationsmentioning

confidence: 78%

Physics with CEBAF at 12 GeV and Future Opportunities

Arrington¹,

Battaglieri²,

Boehnlein³

et al. 2021

Preprint

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We summarize the ongoing scientific program of the 12 GeV Continuous Electron Beam Accelerator Facility (CE-BAF) and give an outlook into future scientific opportunities. The program addresses important topics in nuclear, hadronic, and electroweak physics including nuclear femtography, meson and baryon spectroscopy, quarks and gluons in nuclei, precision tests of the standard model, and dark sector searches. Potential upgrades of CEBAF are considered, such as higher luminosity, polarized and unpolarized positron beams, and doubling the beam energy.

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“…For simplicity we take ground-state matrix elements and a ratio between nucleus with A nucleons to the deuteron. This setup is directly related to the experiments for inclusive cross section ratios [13][14][15][16][17], but we can interpret the details more generally. In Sec.…”

Section: B Schematic Look At Factorized Matrix Elementsmentioning

confidence: 99%

“…8. Proton momentum distributions for 12 C, 16 O, and 40 Ca calculated in the LDA for q > 0.6 fm −1 . Here we use AV18 to SRG-evolve the operator setting λ = 1.35 fm −1 , and divide each distribution by the proton number Z.…”

Section: B Local Density Approximation Calculationsmentioning

confidence: 99%

“…The smoking gun experiments for SRCs in the high-RG-resolution picture come in two varieties: inclusive reactions with carefully chosen kinematics [13][14][15][16][17] and experiments featuring the knock-out and detection of two high-momentum nucleons [3-7, 9, 18]. These experiments manifest key features of high-resolution SRC phenomenology [1]:…”

Section: Introductionmentioning

confidence: 99%

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Short-range correlation physics at low RG resolution

Tropiano,

Bogner,

Furnstahl

2021

Preprint

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Recent experiments have succeeded in isolating processes for which short-range correlation (SRC) physics is dominant and well accounted for by SRC phenomenology. But an alternative and compelling picture emerges from renormalization group (RG) evolution to low RG resolution. At high RG resolution, SRCs are identified as components in the nuclear wave function with relative pair momenta greater than the Fermi momentum. Scale separation results in wave-function factorization that can be exploited with phenomenologies such as the generalized contact formalism or the low-order correlation operator approximation. Evolution to lower resolution shifts SRC physics from nuclear structure to the reaction operators without changing the measured observables. We show how the features of SRC phenomenology manifested at high RG resolution are cleanly identified at low RG resolution using simple two-body operators and local-density approximations with uncorrelated wave functions, all of which can be systematically generalized. We verify that the experimental consequences to date follow directly at low resolution from well-established properties of nucleon-nucleon interactions such as the tensor force. Thus the RG reconciles the contrasting pictures of the same experiment and shows how to get correct results using wave functions without SRC components. Our demonstration has implications for the analysis of knock-out reactions for which SRC physics is not cleanly isolated.

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Search for three-nucleon short-range correlations in light nuclei

Cited by 19 publications

References 34 publications

Searching for three-nucleon short-range correlations

Searching for three-nucleon short-range correlations

Physics with CEBAF at 12 GeV and Future Opportunities

Short-range correlation physics at low RG resolution

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