Progress in understanding short-range structure in nuclei: an experimental perspective

Arrington, John; Fomin, Nadia; Schmidt, Axel

doi:10.48550/arxiv.2203.02608

Cited by 3 publications

(4 citation statements)

References 72 publications

(157 reference statements)

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“…The universality of SRC can be described by the similar form of nuclear wave function at high nucleon momentum, which is confirmed by the experimental observations of the x-independence and the weak Q 2 -dependence of the cross section ratio between two different nuclei in the region of 1.4 x 2 [43][44][45]. Different experiments have revealed that most of the SRC pairs are the protonneutron pairs [37,39,40,42,52,53]. This isophobic property supports the point that the immediate tensor force is the primary source for the formation of N-N SRC pairs [46][47][48][49].…”

Section: A Model-asupporting

confidence: 63%

“…The N-N SRC pairs are the temporary close-proximity fluctuations of two strongly interacting nucleons [34][35][36][37]. In experiment, the N-N SRC are identified as the nucleon pair of high relative momentum between nucleons and small center-of-mass momentum of the pair [38][39][40][41][42]. The nucleons in SRC have the momenta much higher than the nuclear Fermi momentum k F .…”

Section: Introductionmentioning

confidence: 99%

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The European Muon Collaboration effect from short-range correlated nucleons in a $x$-rescaling model

Wang¹,

Ma²,

Wang³

2022

Preprint

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In this paper, we examine the hypothesis that the nuclear EMC effect comes merely from the N-N SRC pairs inside the nucleus and that the properties of N-N SRC pair are universal among the various nuclei, using the conventional x-rescaling model for the EMC effect. With the previously determined effective mass of the short-range correlated nucleon and the number of N-N SRC pairs estimated, we calculate the EMC effect of various nuclei within the x-rescaling approach. From our calculations, the nuclear EMC effect due to the mass deficits of the SRC nucleons is not enough to reproduce the observed EMC effect in experiments. We speculate that the internal structure of the mean-field single nucleon is also obviously modified, or there are more origins of the EMC effect beyond the N-N SRC configuration (such as the α cluster), or the universality of N-N SRC pair is violated noticeably from light to heavy nuclei.

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Section: A Model-asupporting

confidence: 63%

Section: Introductionmentioning

confidence: 99%

The European Muon Collaboration effect from short-range correlated nucleons in a $x$-rescaling model

Wang¹,

Ma²,

Wang³

2022

Preprint

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“…In Ref. [1], we showed how evolving to low resolution quantitatively accounts for short-range correlation (SRC) physics phenomenology [2][3][4][5][6][7][8][9][10][11] with a cleanly interpreted framework that enables simple yet systematically improvable approximations. More generally, RG evolution enhances scale separation and hence factorization of structure and reaction mechanisms, facilitating the extraction of process-independent quantities and correlations between observables.…”

Section: Introductionmentioning

confidence: 99%

The quasi-deuteron model at low RG resolution

Tropiano,

Bogner,

Furnstahl

et al. 2022

Preprint

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Background:The quasi-deuteron model introduced by Levinger is used to explain cross sections for knocking out high-momentum protons in photo-absorption on nuclei. This is within a framework we characterize as exhibiting high renormalization group (RG) resolution. Assuming a one-body reaction operator, the nuclear wave function must include two-body short-range correlations (SRCs) with deuteron-like quantum numbers. In [Tropiano et al., Phys. Rev. C 104, 034311 (2021)], we showed that SRC physics can be naturally accounted for at low RG resolution.Purpose: Here we describe the quasi-deuteron model at low RG resolution and determine the Levinger constant, which is proportional to the ratio of nuclear photo-absorption to that for photo-disintegration of a deuteron.Method: We extract the Levinger constant based on the ratio of momentum distributions at high relative momentum. We compute momentum distributions evolved under similarity RG (SRG) transformations, where the SRC physics is shifted into the operator as a universal two-body term. The short-range nature of this operator motivates using local-density approximations with uncorrelated wave functions in evaluating nuclear matrix elements, which greatly simplifies the analysis. The operator must be consistently matched to the RG scale and scheme of the interaction for a reliable extraction. We apply SRG transformations to different nucleon-nucleon (NN) interactions and use the deuteron wave functions and Weinberg eigenvalues to determine approximate matching scales.Results: We predict the Levinger constant for several NN interactions and a wide range of nuclei comparing to experimental extractions. Conclusions:The predictions at low RG resolution are in good agreement with experiment when starting with a hard NN interaction and the initial operator. Similar agreement is found using soft NN interactions when the additional two-body operator induced by evolution from hard to soft is included.

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“…More data on light nuclei will improve our understanding of the underlying nuclear physics driving both SRCs and the EMC effect. In addition, measurements at nearlyconstant values of A covering a range in N/Z will help us understand the impact of the isospin structure (since SRCs are dominated by neutron-proton pairs [11][12][13][14][15]). Such measurements will be made at Jefferson Lab in experimental Hall C by experiments E12-10-008 (EMC) and E12-06-105 (SRC) [16,17].…”

mentioning

confidence: 99%

First Measurement of the EMC Effect in $^{10}$B and $^{11}$B

Karki,

Biswas,

Gonzalez

et al. 2022

Preprint

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The nuclear dependence of the inclusive inelastic electron scattering cross section (the EMC effect) has been measured for the first time in 10 B and 11 B. Previous measurements of the EMC effect in A ≤ 12 nuclei showed an unexpected nuclear dependence; 10 B and 11 B were measured to explore the EMC effect in this region in more detail. Results are presented for 9 Be, 10 B, 11 B, and 12 C at an incident beam energy of 10.6 GeV. The EMC effect in the boron isotopes was found to be similar to that for 9 Be and 12 C, yielding almost no nuclear dependence in the EMC effect in the range A = 4 − 12. This represents important, new data supporting the hypothesis that the EMC effect depends primarily on the local nuclear environment due to the cluster structure of these nuclei.

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Progress in understanding short-range structure in nuclei: an experimental perspective

Cited by 3 publications

References 72 publications

The European Muon Collaboration effect from short-range correlated nucleons in a $x$-rescaling model

The European Muon Collaboration effect from short-range correlated nucleons in a $x$-rescaling model

The quasi-deuteron model at low RG resolution

First Measurement of the EMC Effect in $^{10}$B and $^{11}$B

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