The HPS Experiment

The HPS experiment in Hall-B at Jefferson Lab has taken engineering run data in 2015 and 2016. Analysis of these data are now in progress…

Tensor Spin Observables Workshop

UNH Co-organizes the workshop for tensor polarization observables at Jefferson Lab, March 10-12, 2014

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HPS Silicon Vertex Tracker

The silicon vertex tracker is at the heart of the HPS experiment, providing information on the path the particles took through the detector.

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Faculty Position in Experimental Nuclear Physics

The Department of Physics at the University of New Hampshire (UNH) seeks an outstanding individual with interest and expertise in experimental nuclear physics, who shows promise of becoming a leader in the field, for a tenure-track assistant professor position beginning in August 2017. The successful candidate is expected to lead an active research program in experimental medium energy nuclear physics, and in addition teach physics and perform service to the department and the University. UNH is a research university on the beautiful New Hampshire seacoast, roughly an hour north of Boston. The successful candidate will have a strong track record of research accomplishments and outstanding potential for teaching and securing external grant funding. Applicants must have a Ph.D. in Physics, or a related field. Review of applications will begin on Dec. 1, 2016. UNH is an AA/EEO Employer. UNH is committed to excellence through diversity of its faculty and staff and encourages women and minorities to apply. For a more comprehensive job description, visit .



Welcome to the web pages of the UNH Nuclear and Particle Physics Group, which is part of the Physics Department. The group is currently located in our new building, the rebuilt DeMeritt Hall, which we moved into in August 2008.The Nuclear Physics Group’s (NPG) research is aimed at two primary areas of study:

  1. Searches for physics beyond the Standard Model;
  2. Understanding the structure of the nucleon and light nuclei, and how this can be described in terms of the strong interaction and spin degrees of freedom.

These mission goals map to two of the top science questions for the 21st century: “What is Dark Matter?” (National Research Council “Connecting Quarks with the Cosmos: Eleven Science Questions for the New Century”, National Academies Press (2003)), and “What is the missing spin of the nucleon?” (Dr. T. J. Hallman, Associate Director for Nuclear Physics, DOE Office of Science, “Perspectives on the Future of Nuclear Physics in the United States”, BNL Distinguished Lecture Series June 13, 2012).

We lead several multi-national collaborations at Jefferson Lab, and are preparing for several additional experiments at this facility. Jefferson Lab is presently completing a $314M upgrade, which was highlighted as the top priority of the last NSAC (National Science Advisory Committee) report. There are two full time faculty (Maurik Holtrop, Karl Slifer). Two postdoctoral research scientists (Elena Long and Rafayel Paramuzyan) and six graduate students (Nathaly Santiesteban, Shujie Li, Toby Badman, Kyle McCarty, Ryan Zielinski, Bradley Yale, ) work in the NPG on Jefferson Lab projects. Over the past decade we have mentored nine PhDs, and more than twenty undergraduates. These students make significant contributions to our efforts both at UNH and at Jefferson Lab, where they work side by side with some of the top scientists in the field. Our main experimental efforts are:

  • The Heavy Photon Search (spokesperson: Holtrop) will search for a new gauge boson –the heavy photon– as a potential particle in a hidden sector that could also contain the Dark Matter.
  • The g2p experiment (spokesperson: Slifer) investigates the spin structure of the proton and how this affects the energy levels of hydrogen like systems.
  • The Isospin SRC experiment (spokesperson: Solvignon, Slifer) will use a tritium target to probe how short-range correlations between nucleons affect the structure of nuclei.

Going forward, our group is at the forefront of an exciting new program to measure Tensor Spin Observables at Jefferson Lab, using a novel tensor polarized solid target. As part of this program, the b1 experiment (spokespersons: Slifer, Solvignon, Long) recently recieved conditional approval from Jefferson Lab PAC40, and we recently submitted a letter of intent (spokespersons: Long, Solvignon, Slifer) to measure the tensor asymmetry in the x>1 region.

The NPG has a major research initiatives in DeMeritt Hall. The group is establishing a cryogenically cooled solid polarized target lab in DeMeritt Hall 103 in support of the Tensor Spin Observables program. We recently installed our new 7 Tesla superconducting solenoid which provides the target holding field. This project is a collaboration with the University of Virginia and Jefferson Lab polarized target groups.