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Matthew Redshaw

​​​Photo of Matthew RedshawAssociate Professor
Dow Science Complex 211
  • Ph.D., Florida State University, Tallahassee, FL (2007)
  • M.Phys., University of Surrey, Guildford, England (2002)
Research Fields
  • Experimental atomic and nuclear physics
  • Penning trap mass spectrometry
  • Precision measurement techniques
  • Physics of exotic nuclei
  • Neutrinoless double beta-decay
Research Projects
  • Hi-precision mass measurements with exotic nuclei. The mass of a nucleus is one of its fundamental properties, determined by the mass of its constituent nucleons and the energy required to bind it together. By measuring the masses of exotic nuclei far from the stability, we can investigate trends in the binding energy and hence the structure of these nuclei. In addition, short-lived exotic nuclei are produced in stellar explosions that lead to the formation of all of the heavy elements that exist in nature. The masses of the exotic nuclei involved are required for calculations that model these astrophysical processes. In the lab, rare-isotopes are produced by accelerator facilities, such as the National Superconducting Cyclotron Laboratory (NSCL). To perform mass measurements on the most exotic nuclei that can be produced requires dealing with very low production rates and short lifetimes. One development underway at the NCSL to meet these requiements is the use of Fourier Transform Ion Cyclotron Resonance (FT-ICR) techniques to perform mass measurements with single ions.​​​

  • Ultra-high-precision mass spectrometry with stable and long-lived isotopes. At CMU we are developing a Penning trap for ultra-high-precision mass measurements using single ions. A novel double-Penning trap will be built for simultaneous mass comparisons between two ion species. The Penning trap will be housed inside a 12 tesla superconducting magnet and will be used for measurements with stable and long-lived isotopes produced from a variety of ion sources including a plasma discharge source and a laser ablation source. The use of externally produced ions allows access to a wide range of elements and isotopes. The research program will include precise atomic mass measurements for atomic and nuclear physics, Q-value measurements for neutrinoless double-beta-decay and double-electron capture candidates, neutron separation energy measurements for a test of E=mc2, and dipole moment measurements of polar molecular ions. We will also investigate ion detection and measurement techniques to be used for measurements with short-lived rare-isotopes produced at the NSCL.
Selected Publications
  • Dipole Moments of HCO+ and NH+ from Cyclotron Frequency Polarizability Shifts
    Brianna J. Mount, Matthew Redshaw, and Edmund G. Myers
    Physical Review A 85, 012519 (2012)
  • Double-Beta-Decay Q-values of 74Se and 76Ge
    Brianna J. Mount, Matthew Redshaw, and Edmund G. Myers
    Physical Review C (Rapid Communication) 81, 032501 (2010)
  • Q-value of 115In->115Sn(3/2+): The Lowest Known Energy Beta Decay
    Brianna J. Mount, Matthew Redshaw, and Edmund G. Myers
    Physical Review Letters 103, 122502 (2009)
  • Masses of 130Te and 130Xe and Double-Beta-Decay Q-value of 130Te
    Matthew Redshaw, Brianna J. Mount, Edmund G. Myers, and Frank T. Avignone, III
    Physical Review Letters 102, 212502 (2009)
  • Dipole Moment of PH+ and the Atomic Mass of 28Si, 31P by Comparing Cyclotron Frequencies of Two Ions Simultaneously Trapped in a Penning Trap
    Matthew Redshaw, Joseph McDaniel, and Edmund G. Myers
    Physical Review Letters 100, 093002 (2008)
  • Mass and Double-Beta-Decay Q-value of 136Xe
    Matthew Redshaw, Elizabeth Wingfield, Joseph McDaniel, and Edmund G. Myers
    Physical Review Letters 98, 053003 (2007)​

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