Bulletin of the American Physical Society
APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019; Denver, Colorado
Session D15: Mini-Symposium: Short Range Nuclear Structure IIFocus
|
Hide Abstracts |
Sponsoring Units: DNP Chair: Or Hen, MIT Room: Sheraton Plaza Court 4 |
Saturday, April 13, 2019 3:30PM - 4:06PM |
D15.00001: Signatures of Three-Nucleon Correlations in Nuclei Invited Speaker: Donal B Day Three Nucleon (3N) Short Range Correlations (SRCs) have been the focus of some interest as it is anticipated that, within specific kinematics, these elusive configurations of the nuclear ground state might be detected through inclusive electron scattering. We present the kinematic requirements to be satisfied in order to isolate 3N-SRCs in inclusive processes and demonstrate that a sequence of two short-range NN interactions is the principal mechanism of production. Within this blueprint, we are able to predict that the per-nucleon inclusive cross section ratios, 3/A σA/σ3He, in the 3N-SRC region go as the square of the same ratio where 2N-SRCs are known to dominate. Through a re-analysis of data at the edge of the kinematic domain necessary, we have found signatures of the scaling associated with the onset of 3N-SRCs. These data affirm our prediction of the quadratic relation between the ratios measured in the 3N and 2N-SRC regions for nuclei ranging 4≤ A ≤197. We are able to extract a3(A), the probability of 3N-SRCs in nucleus A relative to 3He. We find that a3(A) is significantly larger than the related function, a2(A), for 2N-SRCs.
In collaboration with: Misak Sargsian, Florida International University; Mark Strikman, Pennsylvania State University; Leonid Frankfurt, Tel Aviv University |
Saturday, April 13, 2019 4:06PM - 4:18PM |
D15.00002: The isospin dependence of Short Range Correlations through Inclusive Electron Scattering from 40Ca and 48Ca Dien Nguyen, Zhihong Ye, John R Arrington, Donal B Day, Douglas W Higinbotham Short Range Correlations (SRCs) have been recognized as responsible for the high momentum tail of the nucleon momentum distribution, n(k). Interactions of 2N pairs are responsible for the high momentum tail and these additionally imprint a universal character on n(k) for all nuclei at large momentum, k. One of the important outstanding questions about SRCs is their isospin dependence, yet unseen in inclusive scattering. An experiment (E08014) took place in Hall A at Jefferson Lab in Spring 2011 and measured inclusive electron scattering cross-sections from the Ca isotopes (40Ca and 48Ca). By taking the ratio of the per nucleon cross section of 48Ca to 40Ca in a kinematic region dominated by SRCs we are able to extract their isospin dependence. After a brief introduction to the theory and the established experimental character of SRCs, the results of the cross-section ratio of 48Ca to 40Ca will be presented. |
Saturday, April 13, 2019 4:18PM - 4:30PM |
D15.00003: Inclusive Short-range Correlation Measurement with 3H and 3He at Jefferson Lab Shujie Li The nucleon-nucleon potential has a strong repulsive core. When a two-nucleon (sub)system falls into this range, they will interact strongly and move away from each other with large momentum. In electron Quasi-elastic(QE) scattering, these so-called short-range correlation(SRC) pairs in nuclei produce events with nucleon initial momentum above the Fermi level. |
Saturday, April 13, 2019 4:30PM - 4:42PM |
D15.00004: New SRC ratios from Hall C at JLab Casey A Morean Inclusive cross section ratio measurements at Jefferson Lab during the 6 GeV era yielded precision EMC and SRC results, in the process suggesting a correlation between the two. The upgrade to 11 GeV at Jefferson Lab has allowed for further investigation of the EMC and SRC phenomena, and data has been collected on new nuclear targets: boron-10 and boron-11. The detector calibrations and boiling corrections for the extraction of these cross-sections have been completed, and the status of the inclusive SRC ratio analysis will be presented. |
Saturday, April 13, 2019 4:42PM - 4:54PM |
D15.00005: EMC ratio's in lighter Nuclei Abishek Karki As part of the 12 GeV commissioning, part of experiment E12-10-008 was run in Hall C at JLab, during Spring 2018. This experiment is a measurement of inclusive electron scattering on several nuclei aiming to extract the ratio of nuclear structure function to those from deuterium. This is the first measurement of the EMC ratio for targets 10B and 11B, which was included to expand the set of lighter nuclei to test the idea that the local nuclear density plays an important role in quark modification. In this talk, I will be showing some preliminary results and our current analysis status. |
Saturday, April 13, 2019 4:54PM - 5:06PM |
D15.00006: Nuclear photoabsorption cross section ratio R = σL/σT in A=3 nuclei Tyler T Kutz Charged lepton-nuclear deep inelastic scattering cross sections depend on dimensionless structure functions, F1 and F2. These structure functions can be expressed in terms of σL and σT, the nuclear photoabsorption cross sections for longitudinally and transversely polarized virtual photons, respectively. The ratio R = σL/σT is critical to obtaining the F2 structure function (or structure function ratio) from a measured nuclear cross section (or cross section ratio). Although R has only been measured for a few nuclei, assumptions about R are often made when analyzing nuclear cross section data. This is relevant to a series of experiments completed in Jefferson Lab’s Hall A during 2018. The experiments used a novel tritium target, alongside hydrogen, deuterium, and helium targets, to obtain structure function ratios from measured cross section ratios (assuming nuclear independence of R). Using a Rosenbluth separation style technique, it may be possible to use this data to obtain model-independent extractions of ΔR, the difference in R between various pairs of nuclei. This would not only add to the global dataset of R measurements, but could verify the assumptions made by the experiments in transitioning from cross sections to structure functions. |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700