New properties of the high-momentum distribution of nucleons in asymmetric nuclei

Sargsian, Misak

doi:10.1103/physrevc.89.034305

Cited by 71 publications

(83 citation statements)

References 44 publications

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“…In particular, we assume that the SRC term only contributes to the isoscalar distribution f 0 = (f p/A + f n/A )/A, and that it cancels out in the isovector distribution f 1 = (f p/A − f n/A )/A. This behavior is supported by the observation of the dominance of pn SRC pairs in nucleon knock-out experiments [60], as well as by a recent analysis of the nuclear momentum distributions in the high-momentum region [61]. The isovector distribution f 1 is calculated as the difference between the mean-field contributions to the proton and the neutron spectral functions and is proportional to the nuclear asymmetry β = (Z − N)/A [15].…”

Section: A Impulse Approximation and Off-shell Correctionssupporting

confidence: 68%

Nuclear parton distributions and the Drell-Yan process

2014

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We study the nuclear parton distribution functions on the basis of our recently developed semimicroscopic model, which takes into account a number of nuclear effects including nuclear shadowing, Fermi motion and nuclear binding, nuclear meson-exchange currents and off-shell corrections to bound nucleon distributions. We discuss in details the dependencies of nuclear effects on the type of parton distribution (nuclear sea vs. valence) as well as on the parton flavour (isospin).We apply the resulting nuclear parton distributions to calculate ratios of cross sections for protoninduced Drell-Yan production off different nuclear targets. We obtain a good agreement on the magnitude, target and projectile x and the dimuon mass dependence of proton-nucleus Drell-Yan process data from the E772 and E866 experiments at Fermilab. We also provide nuclear corrections for the Drell-Yan data from the E605 experiment.

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Section: A Impulse Approximation and Off-shell Correctionssupporting

confidence: 68%

Nuclear parton distributions and the Drell-Yan process

2014

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“…Finally, we would like to stress that our approach provides momentum distributions that in some momentum regions are lower by 15-20 % than the ones calculated with the VMC momentum distributions; as already pointed out, this can be attributed partly to the different Hamiltonian used in the two approaches, and partly to the different variational wave functions; this point is under investigation. To conclude, our approach turned out to be accurate enough to describe the main features of SRCs in few-nucleon systems and iso-scalar nuclei with A ≤ 40, so that it should deserve the extension to different types of NN interaction models differing, particularly, in the short range behavior, and should be applied to heavier neutron-rich nuclei, whose investigation presents several interesting aspects [31,43].…”

Section: Discussionmentioning

confidence: 99%

Universality of nucleon-nucleon short-range correlations: The factorization property of the nuclear wave function, the relative and center-of-mass momentum distributions, and the nuclear contacts

2016

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Universality of nucleon-nucleon short-range correlations: the factorization property of the nuclear wave function, the relative and center-of-mass momentum distributions, and the nuclear contacts Background: the two-nucleon momentum distributions of nucleons N1 and N2 in a nucleus A, n, is a relevant quantity that determines the probability to find the two nucleons with relative momentum k rel and center-of-mass (c.m.) momentum Kc.m.; at large values of the relative momentum and, at the same time, small values of the c.m. momentum, nprovides information on the short-range structure of nuclei.Purpose: calculation of the momentum distributions of proton-neutron and proton-proton pairs in 3 He, 4 He, 12 C, 16 O and 40 Ca, in correspondence of various values of k rel and Kc.m.. Methods: the momentum distributions for A > 4 nuclei are calculated as a function of the relative, k rel , and center of mass, Kc.m., momenta and relative angle Θ, within a linked cluster many-body expansion approach, based upon realistic local two-nucleon interaction of the Argonne family and variational wave functions featuring central, tensor and spin-isospin correlations.Results: independently of the mass number A, at values of the relative momentum k rel > ∼ 1.5 ∼ 2f m −1 the momentum distributions exhibit the property of factorization, n I. AIM AND INTRODUCTIONThe investigation of short-range correlations (SRCs) in nuclei is ultimately aimed at unveiling the details of in-medium short-range nucleon-nucleon (NN) dynamics, a relevant physics issue that cannot be answered by scattering experiments of two free nucleons (see recent review papers on the subject [1-5]). A reliable way to gather information on SRCs would be to detect significant deviations of proper experimental data (e.g. electrodisintegration processes off nuclei) from theoretical predictions based upon ab initio solutions of the nuclear many-body problem, obtained from various NN interactions differing in the short-range part. In practice such an approach faces several problems because it implies the ex- *

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“…[32,33] it was predicted that single proton or neutron momentum distributions in the 2N SRC domain are inverse proportional to their relative fractions in nuclei. This prediction is in agreement with the results of variational Monte-Carlo calculation of momentum distributions of light nuclei [34] as well as for medium to heavy nuclei based on the SRC model calculations of…”

Section: Phenomenology Of Two Nucleon Short Range Correla-tions Imentioning

confidence: 99%

“…The relative momentum distribution of the NN SRC, n N N (p rel ), can be modeled according to Ref. [32,33], where the high momentum strength of the nucleon momentum distribution is predicted to be inverse proportional to the relative fraction of the nucleon in the nucleus. Such a distribution is in agreement with the recently observed dominance of pn SRCs [19,20,25] and can be expressed in the form:…”

Section: B Two Nucleon Short-range Correlationsmentioning

confidence: 99%

Multinucleon short-range correlation model for nuclear spectral functions: Theoretical framework

Artiles

Sargsian

2016

Phys. Rev. C

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We develop a theoretical approach for nuclear spectral functions at high missing momenta and removal energies based on the multi-nucleon short-range correlation (SRC) model. The approach is based on the effective Feynman diagrammatic method which allows to account for the relativistic effects important in the SRC domain. In addition to two-nucleon SRC with center of mass motion we derive also the contribution of three-nucleon SRCs to the nuclear spectral functions. The latter is modeled based on the assumption that 3N SRCs are a product of two sequential short range NN interactions. This approach allowed us to express the 3N SRC part of the nuclear spectral function as a convolution of two NN SRCs. Thus the knowledge of 2N SRCs allows us to model both two-and three-nucleon SRC contributions to the spectral function. The derivations of the spectral functions are based on the two theoretical frameworks in evaluating covariant Feynman diagrams: In the first, referred as virtual nucleon approximation, we reduce Feynman diagrams to the time ordered noncovariant diagrams by evaluating nucleon spectators in the SRC at their positive energy poles, neglecting explicitly the contribution from vacuum diagrams. In the second approach, referred as light-front approximation, we formulate the boost invariant nuclear spectral function in the lightfront reference frame in which case the vacuum diagrams are generally suppressed and the bound nucleon is described by its light-cone variables such as momentum fraction, transverse momentum and invariant mass.

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New properties of the high-momentum distribution of nucleons in asymmetric nuclei

Cited by 71 publications

References 44 publications

Nuclear parton distributions and the Drell-Yan process

Nuclear parton distributions and the Drell-Yan process

Universality of nucleon-nucleon short-range correlations: The factorization property of the nuclear wave function, the relative and center-of-mass momentum distributions, and the nuclear contacts

Multinucleon short-range correlation model for nuclear spectral functions: Theoretical framework

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