Hope College Physics Department
Research Experiences for Undergraduates
Summer 2009
Project Summary


Project Title: Spectroscopy of 12Li
Student Name: Eric Lunderberg
Student's Home Institution: Hope College
Research Advisor: Dr. Paul DeYoung and Dr. Graham Peaslee
Source of Support: This material is based upon work supported by the National Science Foundation under NSF-REU Grant No. PHY-0452206, by the Hope College Dean for the Natural and Applied Sciences and the National Science Foundation under Grant No. RUI 0651627.

The decay energy of 12Li formed by a two-proton knockout reaction from a 53.4 MeV/u 14B beam is presented. The decay energy spectrum was measured with the Modular Neutron Array (MoNA) and Sweeper dipole superconducting magnet at the National Superconducting Cyclotron Laboratory. The measured decay energy spectrum exhibits evidence of one s-wave resonance and two d-wave resonances in 12Li. The d-wave resonances are modeled by energy-dependent Breit-Wigner line shapes, and the s-wave resonance line shape was calculated with a scattering length of -13.7 fm1. The specific energies for the two Breit-Wigner resonances are 250±20 keV and 555±20 keV. The observed widths were dominated by the experimental resolution. The specific values for the d-wave resonances were determined by comparing the experimental data to simulations that included the various detector resolutions and acceptances.
1Yu, Aksyutina et al., Phys. Lett. B666, 430 (2008).

Publications and Presentations:
“First Observation of Ground State Dineutron Decay: 16Be”, A. Spyrou, Z. Kohley, T. Baumann, D. Bazin, B.A. Brown, G. Christian, P.A. DeYoung, J.E. Finck, N. Frank, E. Lunderberg*, S. Mosby, W.A. Peters, A. Schiller, J.K. Smith, J. Snyder, M.J. Strongman, M. Thoennessen, and A. Volya. Phys. Rev. Lett. submitted(2011).
“Evidence for the ground-state resonance of 26O”, E. Lunderberg*, P.A. DeYoung, Z. Kohley, H. Attanayake, T. Baumann, D. Bazin, D. Divaratne, S.M. Grimes, A. Haagsma, J.E. Finck, N. Frank, B. Luther, S. Mosby, T. Nagy*, G.F. Peaslee, A. Schiller, J. Snyder, A. Spyrou, M.J. Strongman, and M. Thoennessen. Phys. Rev. Lett. Submitted(2011).
“Exploring the Low-Z Shore of the Island of Inversion at N = 19”, G. Christian,N. Frank, S. Ash, T. Baumann, J. Brown, P. A. DeYoung, J. E. Finck, A. Gade, G. F. Grinyer, A. Grovom, J. D. Hinnefeld, E.M. Lunderberg*, B. Luther, M.Mosby, S. Mosby, T. Nagi*, G. F. Peaslee, W. F. Rogers, J. K. Smith, J. Snyder, A. Spyrou, M. J. Strongman, M. Thoennessen, M. Warren, D. Weisshaar, and A. Wersal. Phys. Rev. Lett. Submitted(2011).
“Population of a Virtual State in 21C and Constraints on Halo Nucleus 22C”, S. Mosby, N.S. Badger*, T. Baumann, D. Bazin, M. Bennett*, J. Brown, G. Christian, P.A DeYoung,J.E Finck, M. Gardner*, J.D Hinnefeld, E.A Hook*, E.M Lunderberg*, B. Luther, D.A. Meyer, M. Mosby, G.F. Peaslee, W.F. Rogers, J.K. Smith, J. Snyder, A. Spyrou, M.J. Strongman, M. Thoennessen.  Phys. Lett. B, submitted(2011).
“Spectroscopy of 13Li”, E.M. Lunderberg*, C.C. Hall*, P.A. DeYoung, M. Thoennessen, J. Snyder, and Mona Collaboration. Division of Nuclear Physics of the APS meeting, East Lansing MI, October 2011.

“Analysis of Data from Neutron Detectors”, Eric Lunderberg. . 2011 Celebration of Undergraduate Research, Hope College, April 15, 2011.
“First observation of excited states in 12Li” C.C. Hall*, E.M. Lunderberg*, P.A. DeYoung, T. Baumann, D. Bazin, G. Blanchon, A. Bonaccorso, B.A. Brown, J. Brown, G. Christian, D.H. Denby*, J. Finck, N. Frank, A. Gade, J. Hinnefeld, C.R. Hoffman, B. Luther, S. Mosby, W.A. Peters, A. Spyrou, and M. Thoennessen. Phys. Rev. C 81, 021301(R) (2010).
"Spectroscopy of 12Li." by E. Lunderberg*, C. Hall*, P. DeYoung, A.Spyrou, M. Thoennessen, MoNA Collaboration. CEU Poster GB0.00070. Bull. Am. Phys. Soc. 54, (2009). Division of Nuclear Physics Fall Meeting. Waikoloa, Hawaii (2009).