Bulletin of the American Physical Society
2021 Fall Meeting of the APS Division of Nuclear Physics
Volume 66, Number 8
Monday–Thursday, October 11–14, 2021; Virtual; Eastern Daylight Time
Session EG: Mini-Symposium: Short Range Correlations in Nuclei II |
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Chair: Nathaly Santiesteban, M.I.T Room: Copley & Kenmore |
Tuesday, October 12, 2021 11:45AM - 11:57AM |
EG.00001: The Generalized Contact Formalism and Short-Range Correlations in Nuclei Nir Barnea Nuclear short-range correlations (SRCs), i.e. the probability of finding few nucleons |
Tuesday, October 12, 2021 11:57AM - 12:09PM |
EG.00002: Lattice QCD constraints on the parton distribution functions of 3He Phiala E Shanahan I will report on a recent lattice QCD determination of the fraction of the longitudinal momentum of 3He that is carried by the isovector combination of u and d quarks. The ratio of this combination to that in the constituent nucleons is found to be consistent with unity at the few-percent level from calculations with quark masses corresponding to a pion mass of 800MeV, extrapolated to the physical quark masses. This constraint is consistent with, and significantly more precise than, determinations from global nuclear parton distribution function fits. Including the lattice QCD determination of the momentum fraction in the nNNPDF global fitting framework results in the uncertainty on the isovector momentum fraction ratio being reduced by a factor of 2.5, and thereby enables a more precise extraction of the u and d parton distributions in 3He. |
Tuesday, October 12, 2021 12:09PM - 12:21PM |
EG.00003: The LAD Experiment: measuring medium-modification using spectator-tagged deep inelastic scattering Axel W Schmidt, Tyler T Kutz, Sara Ratliff The EMC Effect, the modification of the structure of bound nucleons relative to free nucleons, has been a major open puzzle in nuclear physics for almost 40 years. While there are several tenable hypotheses about the effect's orgin, the hypothesis that structure modification is driven by high-virtuality nucleons in short-range correlated pairs makes a testable prediction---modification should increase with virtuality. The upcoming LAD experiment at Jefferson Lab Hall C will test this prediction using the technique of spectator-tagged deep inelastic scattering (DIS) on deuterium. A Large-Acceptance Detector (LAD) composed of GEMs and scintillators will tag spectator protons from DIS on bound neutrons, providing a connection between the initial state of the deuteron, and the quark momentum distribution. LAD will cover a range of kinematics from parallel to perpendicular, which can help elucidate the effects final state interactions. The LAD experiment and its connection to recent experimental and theoretical results will be presented. |
Tuesday, October 12, 2021 12:21PM - 12:33PM |
EG.00004: Isospin dependence of NN correlations, quenching of spectroscopic factors, and effects on other nuclear structure observables Stefanos Paschalis, Marina Petri, Augusto O Macchiavelli Although the atomic nucleus consists of strongly interacting nucleons, the independent-particle model provides a basic framework to explain many properties of nuclei. Correlations between the nucleons, both of short-range (SRC) and long-range (LRC) nature, modify the mean-field approximation and dilute the pure independent-particle picture, and are thought to be the reason for the quenching of spectroscopic factors observed in (e,e’p), (p,2p) and single-nucleon direct reactions. Following from the observed increase of the high-momentum component of the proton momentum density in a neutron-rich nucleus [1], we proposed a phenomenological approach to examine the role of NN SRC and LRC and their evolution in asymmetric systems [2]. The predictions agree well with the reduced proton occupancies for states below the Fermi level [3,4], as a function of the asymmetry (N-Z)/A, and shed light on the question of quenching in intermediate energy single-nucleon knockout on complex targets [5]. In this work we will discuss further implications of our results and possible effects on other low-energy nuclear structure observables. |
Tuesday, October 12, 2021 12:33PM - 12:45PM |
EG.00005: Probing New Structures in the Deuteron at Short Distances Misak M Sargsian We are presenting new results on investigation of deuteron structure at extremely short distances. To avoid the vacuum fluctuatiotions that complicate the observation of genuine deuteron structure in the lab frame we develop theoretical framework for description of the deuteron on the Light Front. The consistent calculation of the deuteron wave function reveals a new structures which are unreachable in the lab frame. We demonstrate that these structures are related to the inelastic transition in the deuteron that can be associated with non-nucleonic or explicit quark degrees of freedom. The relevance of these strucutres for the dynamics of cold dense nuclear matter is discussed. |
Tuesday, October 12, 2021 12:45PM - 12:57PM |
EG.00006: Treading the radioactive path: First results from high-energy inverse kinematics SRC measurement Or Hen Studies of stable neutron-rich nuclei showed that the formation of Shora-Range Correlated nucleon pairs have a significant impact on the distributoin of proton in these nuclei [Duer and Hen et al., Nature 2018]. To fully understand the dynamics and pairing mechnisms of SRCs in very neutron rich systems however, one must study radioactive nuclei that are not accecible in fixed-target facilities. In this talk I will present results form the first high-energy inverse kienmatics hadronic-probe measurements of SRCs at the JINR facility [Patsyuk and Kahlbow et al., Nature Physics 2021]. Building on our fundings I will present next-generation experiments at JINR and GSI that will collect data in 2021/22 and will include first measurements of radioactive atomic nuclei. |
Tuesday, October 12, 2021 12:57PM - 1:09PM |
EG.00007: Abstract Withdrawn
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Tuesday, October 12, 2021 1:09PM - 1:21PM |
EG.00008: On nuclear short-range correlations and zero-energy scattering Saar beck, Ronen Weiss, Nir Barnea In this talk, we plan to present a systematic analysis of nuclear 2,3-body short range |
Tuesday, October 12, 2021 1:21PM - 1:33PM |
EG.00009: Short-range correlation physics at low RG resolution Anthony J Tropiano, Dick Furnstahl, Scott Bogner 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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