Professor, Physics

Professor, Physics

Office
211 Nieuwland Science Hall
Notre Dame, IN 46556
Phone
+1 574-631-7352
Email
garg@nd.edu

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Research Interests

Prof. Garg's research interests include experimental investigation of compressional-mode giant resonances and exotic quantal rotation in nuclei.

Giant resonances are highly collective states of nuclear vibration. The compressional-mode giant resonances provide the only direct experimental measurement of the nuclear incompressibility, a fundamental property of nuclear matter that is crucial to understanding of a number of nuclear and astrophysical phenomena, including strength of collapse in supernovae explosions, collective-flow in high-energy heavy ion collisions, and properties of neutron stars—the “largest nuclei” that exist in nature. Prof. Garg’s group has been investigating the Isoscalar Giant Monopole Resonance (the "breathing mode") and the Isoscalar Giant Dipole Resonance (the “squeezing mode”), both compressional oscillations for experimental measurements of the nuclear incompressibility.

The atomic nuclei exhibit a number of interesting and exciting phenomena at large angular momenta viz. shape transitions, quenching of superfluid behavior, order-to-chaos transitions, etc. In recent years, Prof. Garg’s group has investigated the exotic processes of chiral rotation (yes, the nuclei can be left- or right-handed!) and wobbling motion (akin to rotation of an asymmetric top) in nuclei. Both these phenomena are characteristic of triaxial nuclei, a rare and exotic shape--an ellipsoid with all three axes unequal.

Honors and Activities

Fellow, American Association for Advancement of Science

Fellow of the American Physical Society

Recipient of "The Faculty Award", 2018

Fulbright Specialist Award, 2015-2019

Distinguished Adjunct Professor, BITS-Pilani, India, 2020-

Guest Professor, Xi’an Jiaotong University 2019-

Guest Professor, Peking University, China, 2015-

Adjunct Professor, Tata Institute of Fundamental Research, India, 2014-

JSPS Fellow, RIKEN, Japan, 2012

PKU Fellow, Peking University, China, 2012

EMMI Visiting Professor, GSI, Germany, 2011

Guest scientist at the Argonne National Laboratory (since 1983)

Recipient of the 2006 Kaneb Award for Excellence in Teaching

Recipient of the inaugural Terrence Akai Award for Service to International Students

Director of the Department of Physics Research Experience for Undergraduates (REU) program (since 2000)

Education

B.Sc., B.I.T.S., Pilani, India, 1972
M.Sc., ibid., 1974
M.A., S.U.N.Y. at Stony Brook, 1975
Ph.D., ibid., 1978

Publications

“Compressional-mode resonances in the molybdenum isotopes: Emergence of softness in open-shell nuclei near A = 90” K.B. Howard, U. Garg et al., Phys. Lett. B 807, 135608 (2020).

“Longitudinal Wobbling Motion in 187Au,” N. Sensharma, U. Garg et al., Phys. Rev. Lett. 124, 052501 (2020).

“Compression-mode resonances in the calcium isotopes and implications for the asymmetry term in nuclear incompressibility,” K.B. Howard, U. Garg et al., Phys. Lett. B 801,135185 (2020).

"Two-phonon wobbling in 135Pr," N. Sensharma, U. Garg et al., Phys. Lett. B 792, 170 (2019).