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John Hardy Headshot
TAMU College Station
Faculty: Distinguished Professor Emeritus

John C. Hardy


Professor Hardy's primary focus is on the study of superallowed nuclear beta decay as a probe of weak interaction. By combining precise measurements with specialized calculations to account for radiative and isospin-symmetry-breaking effects, he and his colleagues have obtained the most precise value for the up-down quark mixing element of the Cabibbo-Kobayashi-Maskawa matrix and made possible the most demanding test currently available of the unitarity of that matrix; their results also set the tightest limit on the possible existence of scalar currents. They continue to refine and improve their studies in order to explore further physics beyond the Standard Model.

Latest Publications

K. Kolos, A.M. Hennessy, N.D. Scielzo, V.E. Iacob, J.C. Hardy, M.A. Stoyer, A.P. Tonchev, W.-J. Ong, M.T. Burkey, B. Champine, J.A. Clark, P. Copp, A. Gallant, E.B. Norman, R. Orford, H.I. Park, J. Rohrer, D. Santiago-Gonzalez, G. Savard, A.J. Shaka, B.S. Wang, and S. Zhu. “New approach to precisely measure \(\gamma\)-ray intensities for long-lived fission products, with results for the decay of 95Zr.” Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1000, 165240, Jun 2021.

V. E. Iacob, J. C. Hardy, H. I. Park, M. Bencomo, L. Chen, V. Horvat, N. Nica, B. T. Roeder, and A. Saastamoinen. “New precise half-life measurement for the superallowed \(\beta\)\(+\) emitter Ar34.” Phys. Rev. C, 101(1), 015504, Jan 2020.

V. E. Iacob, J. C. Hardy, H. I. Park, M. Bencomo, L. Chen, V. Horvat, N. Nica, B. T. Roeder, A. Saastamoinen, and I. S. Towner. “Precise \(\beta\) branching-ratio measurement for the 0\(+\)\(\rightarrow\)0\(+\) superallowed decay of Ar34.” Phys. Rev. C, 101(4), 045501, Apr 2020.

V. Horvat, E. E. Tereshatov, J. C. Hardy, N. Nica, C. M. Folden, V. E. Iacob, and M. B. Trzhaskovskaya. “K -shell internal conversion coefficient for M4 decay of the 30.8 keV isomer in Nb93.” Phys. Rev. C, 102(1), 014310, Jul 2020.

J. C. Hardy and I. S. Towner. “Superallowed 0\(+\)\(\rightarrow\)0\(+\) nuclear \(\beta\) decays: 2020 critical survey, with implications for Vud and CKM unitarity.” Phys. Rev. C, 102(4), 045501, Oct 2020.

Awards & Recognition

  • Tom W. Bonner Prize from the American Physical Society (2006)
  • Fellowship, American Physical Society (1983)
  • Rutherford Medal in Physics from the Royal Society of Canada (1981)
  • Fellowship, Royal Society of Canada (1979)
  • Herzberg Medal from the Canadian Association of Physicists (1976)

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