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       Tanja Horn
       Experimental Nuclear Physics Group
       PhD: University of Maryland
       Postdoctoral fellowship: Thomas Jefferson National Accelerator Facility

Basic Info:

Title:       Associate Professor of Physics
Address: Department of Physics,
              The Catholic University of America,
              Washington, DC 20064
Phone:    202-319-5326 (office)
Fax:        202-319-4448
E-mail:    hornt@cua.edu.




Research:

I am an Associate Professor in the Physics Department at The Catholic University of America and work in close collaboration with scientists at the Thomas Jefferson National Accelerator Facility (JLab).

My current research is aimed at unveiling the mysteries of hadron structure in the transition region of Quantum Chromodynamics (QCD) confinement to QCD asymptotic freedom. My experimental program at 12 GeV Jefferson Lab is aimed at precision measurements of meson form factors to the highest momentum transfers achievable and longitudinal-transverse separated deep exclusive meson electroproduction cross sections. My near term proram focuses on carrying out my approved JLab experiments for the studies of the pion (E12-07-105) and the kaon (E12-09-011). The anticipated results of E12-09-011 will provide the most precise spatial mapping of the kaon to date and may reveal new insights into the role of the strange quark. E12-07-105 will provide essential constraints on Generalized Parton Distributions (GPDs) central to the 12 GeV JLab program. The kinematic reach of the experiment will also allow for extending pion form factor data into a regime in which hard QCD's signatures may be quantitatively revealed. With the support of an NSF MRI grant PHY-1039446 my group built the kaon aerogel Cherenkov detector required for particle identification for these experiments. My group successfully installed the detector in the SHMS in 2015 and is responsible for its maintenance. My intermediate program extends beyond the first few experiments at 12 GeV JLab. I have two approved experiments: Deeply Virtual Compton Scattering, DVCS (E12-13-010) and neutral pion cross sections with semi-inclusive scattering, SIDIS (E12-13-007). E12-13-010 will provide DVCS and neutral pion cross sections to the highest momentum transfers to date. These data may allow access to a new class of GPDs. E12-13-007 will provide a basic experimental test of understanding SIDIS that will play a critical role in establishing the entire SIDIS program of studying the partonic structure of the nucleon. Both experiments require new instrumentation for particle identification. Supported by NSF MRI PHY-150874 my group is currently building the PbWO4-based Neutral Particle Spectrometer (NPS), a segmented electromagnetic calorimeter preceded by a sweeping magnet, which will address this need. I am leading the consortium that is building the sweeping magnet and infrastructure for the NPS. My group has setup the facilities to characterize the NPS scintillating crystals. My future science program focuses on opportunities with the Electron-Ion Collider (EIC). The EIC would make it possible to study the contribution of sea quarks and gluons to the masses of the lightest mesons and to develop a 3D imaging of the nucleon. My group is working on the conceptual design of and specifications for the detectors needed to carry out these studies. As an example, we are working on the development of a PbWO4-based electromagnetic calorimeter for both EIC endcaps, where high resolution is required for particle identification.

Links to my research program at Jefferson Laboratory and my proposals can be found at: Tanja Horn & JLab

My research in the news:


News and Updates:

Advertisement for a Tenure-Track Faculty Position in Experimental Nuclear Physics at CUA (Application due date: 31 December 2017)

Information on our current projects can be found in our CUA NP physics group Wiki

Upcoming weekly NP group meeting: 6 September, 2017 at 10:00 am (EDT)

Physics Professor Receives Federal Grant for Construction of the Neutral Particle Spectrometer (CUA News Release, December 2015)

High-school Students Search for Kaons (NSF SEE innovation highlight, 2013)

Student Physicists Emerge in Search for Kaons, Quarks, and Gluons (CUA News Release, November 2011)


Awards:

Physicist Wins Grant to Unlock Mysteries of Subatomic Particles (CUA News Release, November 2010)

Young Faculty Scholar Award (CUA News Release, April 2011)


Facilities:

My research is carried out at Jefferson Laboratory in Newport News, VA.

Opportunities in Science Education at JLab are available in the summer for high school,undergraduate students, well as for teachers.


Publications:

A list and links to my publications can be found in the High Energy Physics Literature Database (INSPIRE).


Synergies with Materials Science:

The synergy between nuclear physics and the Vitreous State Laboratory (VSL) allows innovative research in the materials used to build better particle detection instrumentation. To enable detection of uncharged light particles such as photons and neutral pions, our current joint nuclear physics/materials science detector project is the construction of the Neutral Particle Spectrometer (NPS). The instrument will allow an international collaboration led by CUA to perform cutting-edge research to make images of the spatial and orbital angular momentum distributions of quarks inside atoms. The NPS consists of a 3-foot by 3-foot highly segmented particle detector made from lead-tungstate crystals preceded by a large magnet used to sweep away charged particles. Taking advantage of the effective collaboration between the nuclear physics group and the VSL allows for detailed measurements of the material properties of the scintillating, radiation-resistant lead-tungstate crystals.

South African Leadership Program - Blessed's work in summer 2017 (CUA News Release, August 2017)

Poster from 2017 CUA Research Day


Teaching:

Advanced Electromagnetic Theory II: Phys 624, Spring 2017

Experimental techniques and data analysis with Modern Detectors: Phys 675, Spring 2017

Advanced Electromagnetic Theory I: Phys 623, Fall 2016

Advanced Electromagnetic Theory II: Phys 624, Spring 2016

Experimental techniques and data analysis with Modern Detectors: Phys 675, Spring 2016

Advanced Electromagnetic Theory I: Phys 623, Fall 2015

Experimental techniques and data analysis with Modern Detectors: Phys 675, Spring 2015

Advanced Electromagnetic Theory II: Phys 624, Spring 2015

Advanced Electromagnetic Theory I: Phys 623, Fall 2014

Advanced Electromagnetic Theory II: Phys 624, Spring 2014

Experimental techniques and data analysis with Modern Detectors: Phys 675, Spring 2014

Advanced Electromagnetic Theory I: Phys 623, Fall 2013

Advanced Electromagnetic Theory II: Phys 624, Spring 2013

Experimental techniques and data analysis with Modern Detectors: Phys 675, Spring 2013

Advanced Electromagnetic Theory I: Phys 623, Fall 2012

Advanced Electromagnetic Theory II: Phys 624, Spring 2012

Modern Detectors: Phys 675, Spring 2012

Advanced Electromagnetic Theory I: Phys 623, Fall 2011

Advanced Electromagnetic Theory II: Phys 624, Spring 2011

Advanced Electromagnetic Theory I: Phys 623, Fall 2010

Quantum Theory II: Phys 660, Spring 2010

Quantum Theory I: Phys 659, Fall 2009


Events:

25th International Workshop on Deep-Inelastic Scattering and Related Topics, April 3-7, 2017, Birmingham University, UK



Outreach:

Research - students Summer 2017

Research - students Summer 2016

Research - students Summer 2015

Research - students Summer 2014

Research - students Summer 2013

Research - students Summer 2012

Some pictures from the 2011 APS/DNP meeting at which Katya, Laura, and Nathaniel presented their research

Undergraduate students win travel award

Research - students Summer 2011

Research - EIC students Summer 2011

Research - undergraduate students Spring 2011

Research - undergraduate students 2010

Research - highschool students 2010

Summer Workshop on nanotechnology, nucleon&atomic structure, and biophysics 2010

Research - EIC summer students 2010

Jefferson Lab Open House 2010

Research - EIC summer students 2009

Research - EIC summer students 2008



People:

Dr. Arthur Mkrtchyan (Postdoc)

Salina Ali (Graduate student/researcher)

Andres Vargas (Graduate student/researcher)

Richard Trotta (Graduate student/researcher)

Johann Meija-Ott (Undergraduate student/researcher)

Summer/Fall REU/Interns 2017: Dannie Griggs, Blessed Ngwenya, Casey Lauer, Salim Roustom

Alumni from the group:

Marco Carmignotto (PhD 2017, now postdoc at JLab)

Marco was awarded a 2015/16 JSA Graduate Fellowship for Research at Jlab. See the press release here.

Marco was awarded a 2014/15 JSA Graduate Fellowship for Research at Jlab. See the press release here.

Dr. Ibrahim Albayrak - now research assistant professor at Akdeniz University/Turkey

Michael Metz - now graduate student at Univ. of Delaware

Nathaniel Hlavin (Undergraduate student/researcher, now at McLaren HS/Colorado)

Nathaniel was selected for the 2013 Barry Goldwater Scholarship Award. Congratulations! See his listing under the Virginia section on the 2013 Goldwater Scholars web page. He graduated in spring 2014. His senior thesis summarizing his research over the last years can be found here.

Laura Rothgeb (Undergraduate student/researcher, now at UM)

Summer/Fall REU/Interns 2016: Johann Meija-Ott, Abigail McShane (now at Stanford), Dannie Griggs, Jacob Wacht, Salim Roustom

Summer/Fall REU/Interns 2015: Alex Dittmann, William Lash, Christian Runyon, Zach Templeton

Summer Interns 2014: Derek Boylan (now at UVa), Alex Dittmann (now at UIUC), Stephanie Durham (now at UVa), William Lash, Ruhi Parvatam

Summer Interns 2013: Derek Boylan, Stephanie Durham, Abigail Justen, Alex Maleski, Sergio Ribeiro (now at GMU), Jonathan Young

Summer Interns 2012: Lilian Anderson (now at USC), Adam Battle, Gina Repole, Daniel Rice, Mike Wang

Summer Interns 2011: Lilian Anderson, Joshua Kelly, Robert Macedo, Katya Gilbo


Links:

Department of Physics at CUA            Department of Physics Colloquium

The Catholic University of America


Last updated: 1 September 2017