# Nuclear Physics Seminars

Joint Nuclear/HEP seminar

Wednesday, April 28, 2021
4:00 PM
Online, Room via Zoom
Note special date.
Note special time.
Note special room.

## "The Fermilab Muon g-2 Experiment"

Manolis Kargiantoulakis , Fermilab
ABSTRACT:

TBA

Nuclear
Tuesday, April 20, 2021
3:30 PM
Online, Room Via Zoom
Note special room.

## "TBA"

John Boyd , University of Virginia - Department of Physics
[Host: Nilanga Liyanage]
ABSTRACT:

TBA

Nuclear
Tuesday, March 30, 2021
3:30 PM
Physics Building, Room TBA
Note special room.

## "TBA"

Anuruddha Rathnayake , University of Virginia - Department of Physics
[Host: Nilanga Liyanage]
ABSTRACT:

TBA

Nuclear
Tuesday, March 23, 2021
3:30 PM
Physics Building, Room TBA
Note special room.

## "Phenomenology of nucleon 3D structure"

Filippo Delcarro , University of Pavia
[Host: Dustin Keller]
ABSTRACT:

TMDs are fundamental objects in the study of three-dimensional structure of nucleons. However, due to their nonperturbative nature, they cannot be directly computed and have to be extracted from experimental measurements. In this talk we will present the formalism and methodology involved in this analysis and give an overview of the most recent results.

Join Zoom Meeting:
##### Meeting ID: 399396949 (No password required)

Tuesday, February 23, 2021
3:30 PM
Online, Room via Zoom
Note special room.

## "TMDs: a transverse look at hadrons "

Andrea Signori , University of Pavia
[Host: Dustin Keller]
ABSTRACT:

In this talk I will outline some fundamental properties of transverse-momentum-dependent distributions (TMDs), in particular their role in exploring the structure of hadrons in 3D momentum space. I will also focus on some open issues, and on the possibilities to deepen our understanding of hadron structure and hadronization by combining the potential of fixed-target and collider experiments.

Join Zoom Meeting:
##### Meeting ID: 399 393 6949

Tuesday, October 6, 2020
3:30 PM
Online, Room via Zoom
Note special room.

## "The Color Propagation Program in Hall B"

Dr. Michael H. Wood , Canisius College
[Host: Dustin Keller]
ABSTRACT:

Hadronization is the process of a liberated quark traversing the nuclear medium and its formation into a color neutral object.  This talk will focus on the color propagation experiments in Hall B to study the hadronization process.  Hall B is one of the four experimental areas at the Thomas Jefferson National Accelerator Facility (JLab). The original experiment used deep inelastic electron scattering to liberate a quark from a bound nucleon and the CLAS6 detector to count the multiplicity of produced hadrons and measure the transverse momentum broadening in order to understand the hadronization process.   The experiment ran during the CLAS6 period (1997-2011) before the JLab energy upgrade to 12 GeV.  For CLAS12, new reconstruction software, file format, and analysis framework have been developed.  With a grant from the DOE, my students and I developed software to convert the CLAS6 files into the CLAS12 format where I have used the new analysis framework to data mine the old data.  Preliminary color propagation results for protons and mesons will be presented.

Join Zoom Meeting:
##### Meeting ID: 3993936949

Tuesday, September 29, 2020
3:30 PM
Online, Room via Zoom
Note special room.

## "Measurement of flavor asymmetry of light antiquarks in the proton at Fermilab SeaQuest "

Kenichi Nakano , Tokyo Tech
[Host: Dustin Keller]
ABSTRACT:
The proton is commonplace in the world but contains rich information about how matter is constructed by the strong force.  It is described by the parton picture, namely a system made of quarks, antiquarks and gluons, when it is observed in short range such as high-energy scattering.  The proton is the best object to investigate the dynamics of the strong force (i.e. QCD) since it is the simplest stable system bound by the strong force.  Particularly the antiquarks in the proton are of great interest because they are all dynamically created by the strong force.  They are thus sensitive to mechanisms beyond the simple quark model where the proton is composed of only three quarks.

SeaQuest is a fixed-target experiment using the 120-GeV proton beam at Fermilab.  It detects the Drell-Yan process in proton + proton and proton + deuteron scatterings; quark + antiquarks -> gamma^* -> mu^+ + mu^-. It primarily aims at measuring the flavor asymmetry of light antiquarks, namely the difference between antiup and antidown quarks in their distributions in the proton.  Several mechanisms that can induce this asymmetry have been theoretically proposed.

In this seminar, the physics motivation and the measurement principle of SeaQuest are explained.  Then the detector construction, data analysis and experimental results are presented.
Nuclear
Tuesday, February 11, 2020
3:30 PM
Physics Building, Room 204

Siyu Jian , University of Virginia - Department of Physics
[Host: Nilanga Liyanage]
ABSTRACT:

The RMS radius of the neutron distribution in a heavy nucleus RN provides an important test of nuclear theory. Furthermore RN is used in the determination of the density dependence of symmetry energy of neutron rich matter; this dependence is an important input in neutron star structure, heavy iron collision and atomic parity violation experiment calculations. In the past hadron scattering experiments with with pion, proton or anti-proton beams have been used to determine the neutron radii of heavy nuclei. However, these measurements suﬀer from uncertainties associated with the probe particle and the target nucleus. Electron scattering provides a model independent probe of nuclear radii. However, in electron scattering, the measurement of neutron distribution in a nucleus is much harder than the measurement of the proton distribution since the neutron is uncharged. Because the neutron weak charge is much large than that of the proton, PRex-II used the parity violating weak neutral interaction to probe the neutron distribution in the 208Pb nucleus, thus measuring the RMS neutron radius with high accuracy. The PRex-II experiment was performed from June to September 2019 in Jeﬀerson lab experimental hall A using the High Resolution Spectrometer (HRS) pair. This seminar presents the details the PRex-II experiment as well as the preliminary results from HRS Optics calibration measurements and from the Gas Electron Multiplier (GEM) detectors used for obtaining high rate calibration data.

Nuclear
Tuesday, November 19, 2019
3:30 PM
Physics Building, Room 204