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 DG: Mini-Symposium: Short Range Correlations in Nuclei I |
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Chair: Axel Schmidt, Goerge Washington University Room: Copley & Kenmore |
Tuesday, October 12, 2021 9:30AM - 10:06AM |
DG.00001: Short range correlations from a Quantum Monte Carlo perspective Invited Speaker: Noemi Rocco Electron-scattering experiments conducted at Jefferson Lab and other facilities worldwide enable accessing short- range aspects of nuclear dynamics. Quantum Monte Carlo (QMC) techniques are ideal for accurately treating both the long- and short-range components of the nuclear wave function as they emerge from realistic two- and three-body interactions. I will present an overview of recent developments in the description of electroweak interactions within QMC approaches and discuss future perspectives. Besides being relevant for the current experimental program, the studies I will discuss pave the way for precise quantification of the uncertainties inherent to factorization schemes. |
Tuesday, October 12, 2021 10:06AM - 10:18AM |
DG.00002: SRC Scaling at Low xB and the Mean-Field to SRC Transition Andrew W Denniston, Igor Korover, Alex Kiral High momentum nucleons in Short Range Correlations (SRC) cannot be described by mean-field spectral functions and it is difficult to build a picture that describes both phenomena. Most SRC analyses look at events at high-xB to reduce the effect of Final State Interactions (FSI) and inelastic scattering, but this also cuts out the mean field contribution. This means we have no way of seeing how the nucleon momentum distribution evolves over the full momentum range from mean-field to SRC. The analysis presented here achieves a cross section ratio that spans a wide momentum range by relaxing the high-xB cut while keeping strict missing mass cuts on the detected electron and proton to mitigate background scattering mechanisms. Now that our cross section ratios cover a new kinematic range, we can begin to bridge the gap between mean-field and SRC nucleons. |
Tuesday, October 12, 2021 10:18AM - 10:30AM |
DG.00003: Mapping the Mean-Field to SRC Transition Alexander Kiral, Andrew W Denniston, Igor Korover Nuclear many-body theory can make excellent predictions for behavior of nuclei at momentum below the nuclear Fermi momentum. Recently, theories of short-range correlated (SRC) pairs have been developed to model behavior of nuclei far above the Fermi momentum. However, understanding the transition from mean field to SRC dominated regimes has been a challenge for nuclear theory. New analysis of (e, e'p) data from JLab has allowed us to map a cross section ratio as a function of the initial nucleon momentum, which we can compare to sophisticated mean field calculations to understand the transition. Our analysis gives us an upper bound on the momentum where any non-SRC physics can occur, allowing us to use factorized models of the nucleus with confidence above this momentum. We also extract a transition function which can be used to drive future development of theories which combine mean field physics and correlations in nuclei. |
Tuesday, October 12, 2021 10:30AM - 10:42AM |
DG.00004: Comparing Simulated and Measured 3He Neutron-to-Proton Knockout Ratios Erin Seroka, Holly Szumila-Vance, Axel W Schmidt Short-range correlated (SRC) pairs of nucleons provide a valuable setting for studying the short-range regime of the NN interaction due to their close proximity and high relative momentum. The relative abundance of neutrons and protons in SRC pairs has been studied with electron scattering as a function of nuclear size and asymmetry for several different nuclear targets, but few measurements have been made with direct neutron detection. Recent data mining analyses from the CLAS experiment at Jefferson Lab have identified neutrons from the hard break up of SRC pairs. Here these techniques are applied to data on light nuclei and used to benchmark few-body calculations. This talk will present 3He(e,e'n)/3He(e,e'p) ratios in the CLAS experiment at Jefferson Lab, both in the mean field and in the short-range correlated pair regime. Simultaneously, we compare the experimental result with theoretical predictions in the Plane-Wave Impulse Approximation using the spectral functions of Ciofi degli Atti and Kaptari. |
Tuesday, October 12, 2021 10:42AM - 10:54AM |
DG.00005: Electron scattering from 12C in the Short-Time-Approximation Lorenzo Andreoli, Saori Pastore, Maria Piarulli, Stefano Gandolfi, Joseph A Carlson Quantum Monte Carlo methods, together with the phenomenological potentials Argonne v18 and Urbana-IX, are used to obtain accurate nuclear wave functions and evaluate the interaction of nuclei with external electromagnetic probes. |
Tuesday, October 12, 2021 10:54AM - 11:06AM |
DG.00006: Transport Estimations of Final State Interaction Effects on Short-range Correlation Studies Natalie Wright Short range correlated (SRC) nucleon-nucleon pairs in nuclei are typically studied using measurements of electron-induced hard nucleon-knockout reactions (e.g. (e,e′p) and (e,e′pN)), where the kinematics of the knocked-out nucleons are used to infer their initial state prior to the interaction. The validity of this inference relies on our understanding of the scattering reaction, most importantly how the rescattering of detected nucleons (final state interactions or FSI) distort their kinematical distributions. Recent SRC measurements on medium to heavy nuclei have been performed at high-xB, where calculations of light nuclei indicate that such distortion effects are small. Here we study the impact of FSI on recent 12C(e,e′p) and 12C(e,e′pp) measurements using a transport approach. We find that while FSI can significantly distort the measured kinematical distributions of SRC breakup events, selecting high-xB anti-parallel events strongly suppresses such distortions. In addition, including the effects of FSI improves the agreement between Generalized Contact Formalism-based calculations and data and can help identify observables that have minimal sensitivity to FSI effects. This result helps confirm the interpretation of experimental data in terms of initial-state momentum distributions and provides a new tool for the study of SRCs using lepton-scattering reactions. |
Tuesday, October 12, 2021 11:06AM - 11:18AM |
DG.00007: Upcoming High-Statistics Exclusive Measurements of SRCs at CLAS-12 Sara Ratliff Exclusive electron scattering has proven to be a powerful tool for learning about short-range correlations (SRCs) in nuclei. However, past studies have generally been limited by small data samples, either because of limited detector acceptance, or because they were the result of data mining. The CLAS12 Short-Range Correlations Experiment (Run Group M), scheduled to run in Jefferson Lab's Hall B from October–December, 2021, will be the first large-acceptance electron-scattering experiment designed to study short-range correlations in a variety of nuclei of interest. The increased data rate and enhanced detector capabilities of the CLAS12 spectrometer will increase available statistics by factors of 10–100, allowing exploration of unanswered questions such as pair formation mechanisms, effective nuclear forces at short distances, the connection between SRCs and the EMC effect, and even the occurrence of three-nucleon correlations. I will present an overview of the experiment, discuss the preparations for the upcoming run, and showcase how it can explore pressing questions about SRCs. |
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