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I-Yang Lee

nuclear physicist: Nuclear Science Division

Paul Preuss, 510-486-6249,

Lynn Yarris, 510-486-5375,


I-Yang Lee is head of the GRETINA project in the Nuclear Science Division (NSD) and a member of NSD's Low Energy Nuclear Physics program. His interests focus on the properties of unusual atomic nuclei or those under unusual conditions, such as the properties of neutron-rich nuclei, the structure of nuclei in high-spin states, and nuclear collective motion. To aid these and many other studies, Lee has led teams of his Berkeley Lab colleagues and coworkers in other institutions in designing and building some of the world's best detectors for nuclear science.

Gamma-ray detectors measure the direction and energy of gamma rays emitted by nuclei in brief transition, revealing the nature of their short-lived components. Lee spear-headed the creation of the Gammasphere and the recently finished GRETINA, which although constituting only one fourth of the spherical array that will eventually become GRETA (the Gamma Ray Energy Tracking Array), is already the world's most sensitive gamma-ray detector.

A graduate of National Taiwan University, where he received his BS in physics, and the University of Pittsburgh, where he received his Ph.D. in 1974, Lee first served a stint as a postdoctoral fellow at Berkeley Lab and then joined the research staff of Oak Ridge National Laboratory. He came to Berkeley Lab as a staff scientist in 1992, became director of the Gammasphere program in 1995, and headed the scientific program at the 88-Inch Cyclotron until 2003, when he took on GRETA and became GRETINA project manager.


Recent research

Lee has done pioneering studies of electronically segmented germanium crystals for tracking the full path of gamma rays in three dimensions, and been a consultant on heavy ion accelerators and other particle accelerators.

Recent Publications

"A digital signal processing module forgamma-ray tracking detectors, " by M. Cromaz, V. J. Riot, P. Fallon, S. Gros, B. Holmes, I .Y. Lee, A. O. Macchiavelli, C. Vu, H. Yaver, and S. Zimmermann, Nuclear Instruments and Methods in Physics Research A vol 597 (2008), pp 233–237.


"In-beam measurement of the position resolution of a highly segmented coaxial germanium detector, " by M. Descovich, I. Y. Lee, P. Fallon, M. Cromaz, A. O. Macchiavelli, D. C. Radford, K. Vetter, R. M. Clark, M. A. Deleplanque, F. S. Stephens, and D. Ward, Nuclear Instruments and Methods in Physics Research A vol 553 (2005), pp 535–542


"Effects of neutron damage on the performance of large volume segmented germanium detectors, " by M. Descovich, I. Y. Lee, P. N. Luke, R. M. Clark, M. Cromaz, M. A. Deleplanque, R. M. Diamond, P. Fallon, A. O. Macchiavelli, E. Rodriguez-Vieitez, F. S. Stephens, D. Ward, Nuclear Instruments and Methods in Physics Research A, vol  545 (2005), pp 199-209


"GRETINA status and recent progress: The effect of neutron damage on energy and position resolution of the GRETINA detector, " by M. Descovich, I. Y. Lee, M. Cromaz, R. M. Clark, M. A. Deleplanque, R. M. Diamond, P. Fallon, A. O. Macchiavelli, E. Rodriguez-Vieitez, F. S. Stephens, D. Ward, Nuclear Instruments and Methods in Physics Research B 241 (2005), pp 931-934

"Developments in Large Gamma-ray Detector Arrays, " by I. Y. Lee, M. A. Deleplanque, K. Vetter, Reports on Progress in Physics, vol 66 (2003), pp 1095-1144


"Three-dimensional position sensitivity in two-dimensionally segmented HP-Ge detectors, " K. Vetter, A. Kuhn, M. A. Deleplanque, I. Y. Lee, F. S. Stephens, G. J. Schmid, D. Beckedahl, J. J. Blair, R. M. Clark, M. Croma!, R. M. Diamond, P. Fallon, G. J. Lane, J. E. Kammeraad, A. O. Macchiavelli, C. E. Svensson,   Nuclear Instruments and Methods in Physics Research A, vol 452 (2000), pp 223-238 

Awards and Memberships

Fellow, American Physical Society

Member, Department of Energy/National Science Foundation Nuclear Science Advisory Committee, 2007 to present

Member, Rare Isotope Accelerator Users Executive Committee,   2004 to present

Member of the National Superconducting Cyclotron Laboratory, Michigan State University, 2006-2008

Member and Director, Rare Isotope Accelerator Summer School, 2002 to 2006

Chair, GRETA (Gamma Ray Energy Tracking Array) Steering Committee, 2001 to 2003

Divisional Associate Editor, Physical Review Letters, 2000 to 2002


In the News

“Germanium crystals measure position,” by Spencer Klein, CERN Courier, October 6, 2004


National Taiwan University, physics, B.S. 1968

University of Pittsburgh, physics, Ph.D. 1974


I-Yang Lee describes the GRETINA gamma-ray detector during its assembly at Berkeley Lab's 88-Inch Cyclotron.

last updated: 2011-06-28 12:49:03