Lawrence Livermore National Laboratory

Anton Tonchev

Research Staff
Nuclear and Chemical Sciences Division

 +1 925-422-2898

Ph.D. Nuclear Physics
Joint Institute for Nuclear Research, Dubna, Russia
B.S. Physics
Plovdiv University, Plovdiv, Bulgaria and Joint Institute for Nuclear Research, Dubna, Russia
M.S. - -

General Research Interests

  1. Nuclear properties at the extremes of density and temperature
  2. Nuclear Structure 
(collective modes of excitation, giant resonances, high-spin isomeric states)
  3. Nuclear Dynamics 
(nuclear fission, gamma and particle emission, transition from chaos to order)
  4. Nuclear Astrophysics 
(r-process and syntheses of rare isotopes)
  5. Nuclear Applications 
(gamma and neutron activation analysis, radio isotope production, nuclear energy, nuclear transmutation, nuclear forensic)

Selected (Recent) Publications

One book chapter, 134 papers in refereed journals and conference proceedings, 12 recent publications:

  1. Photodisintegration Cross Section of the Reaction 4He(γ,p)3H between 22 and 30 MeV. R. Raut, W. Tornow, M. W. Ahmed, A. S. Crowell, J. H. Kelley, G. Rusev, S. C. Stave, and A. P. Tonchev. Phys. Rev. Lett. 108, 042502 (2012).
  2. Two-body photodisintegration of 3He between 7 and 16 MeV W. Tornow, H.J. Karwowski, J.H. Kelley, R. Raut, G. Rusev, S.C. Stave, A.P. Tonchev, A. Deltuva, A.C. Fonseca, L.E. Marcucci, M. Viviani, A. Kievsky, J. Golak, R. Skibiński, H. Witała, R. Schiavilla. Physics Letters B, 702, 121 (2011).
  3. Cross-Section Measurements of Neutron Induced Reactions on GaAs using Monoenergetic Beams from 7.5 to 15 MeV, R. Raut, A. S. Crowell, B.Fallin, C.R. Howell, C. Huibregtse, J.H. Kelley, T. Kawano, E. Kwan, G. Rusev, A.P. Tonchev, W. Tornow, D. J. Vieira, and J.B. Wilhelmy. Phys. Rev. C 83, 044621 (2011).
  4. Discrete deexcitations in 235U below 3 MeV from nuclear resonance fluorescence, E. Kwan, G. Rusev, A. S. Adekola, S. Hammond, C.R. Howell, H. J. Karwowski, J.H. Kelley, R. Raut, A. P. Tonchev, and W. Tornow. Phys. Rev. C 83, 041601(R) (2011).
  1. Measurement of the 241Am(γ,n)240Am reaction in the giant dipole resonance region, A.P. Tonchev, S. Hammond, C.R. Howell, A. Hutcheson, T. Kawano, J.H. Kelley, E. Kwan, G. Rusev, W. Tornow, D. Vieira, and J.B. Wilhelmy. Phys. Rev. C 82, 054620 (2010).
  2. Spectral structure of the pygmy dipole resonance, A.P. Tonchev, S. Hammond, J.H. Kelley, H. Lenske, G. Rusev, W. Tornow, N. Tsoneva. Phys. Rev. Lett. 104, 072501 (2010).
  3. Investigation of low-lying electric dipole strength in the semi-magic nucleus 44Ca, J. Isaak, D. Savran, M. Fritzsche, D. Galaviz, T. Hartmanny , S. Kamerdzhiev, J. H. Kelley, E. Kwan, N. Pietralla, C. Romig, G. Rusev, K. Sonnabend, A. P. Tonchev, W. Tornow, and A. Zilges. Phys. Rev. C 83, 034304 (2011).
  4. GEM*STAR: The Alternative Reactor Technology Comprising Graphite, Molten Salt, and Accelerators, C.D. Bowman, E. G. Bilpuch, D.C. Bowman, A.S. Crowell, C.R. Howell, K. McCabe, G. A. Smith, A.P. Tonchev, W. Tornow, V. Violet, R.B. Vogelaar, R.L. Walter, J. Yingling. Chapter in Handbook of Nuclear Engineering, Dan Gabriel Cacuci (ed.), Springer Science and Business Media LLC 2010. 
  5. Photoexcitation of astrophysically important states in 26Mg. R. J. DeBoer, M. Wiescher, J. Grres, R. Longland, C. Iliadis, G. Rusev, and A. P. Tonchev. Phys. Rev. C 82, 025802 (2010).
  6. A feasibility study using radiochromic films for fast neutron 2D passive dosimetry, S.L Brady, R. Gunasingha, T.T. Yoshizumi, C. R. Howell, A.S. Crowell, B. Fallin, A.P. Tonchev, and M. Dewhirst. Phys. Med. Biol. 55, 4977 (2010).
  7. Competition between excited core states and 1 ̄ hω single-particle excitations at comparable energies in 207Pb from photon scattering Spin Assignment to (p1/2)-hole coupled E1 excitations of the odd-mass nucleus 207Pb at HIGS, N. Pietralla. T.C. Li, A.P. Tonchev, M.W. Ahmed, T. Ahn, A. Costin, J. Li, S. Muler, I.V. Pinayev, D. Savran, W. Tornow, H.R. Weller, V. Werner, and Y.K. Wu. Phys. Lett. B 681, 134 (2009).
  8. Measurement of the 241Am(n,2n) Reaction Cross Section from 7.6 to 14.5 MeV, A.P. Tonchev, C.T. Angell, M. Boswell, A.S. Crowell, B. Fallin, S. Hammond, C.R. Howell, A. Hutcheson, H.J. Karwowski, J.H. Kelley, R.S. Pedroni, W. Tornow, J.A. Becker, D. Dashdor, J. Kenneally, R.A. Macri, M.A. Stoyer, C.Y. Wu, E. Bond, M.B. Chadwick, J. Fitzpatrick, T. Kawano, R.S. Rundberg, A. Slemmons, D.J. Vieira, and J.B. Wilhelmy. Phys. Rev. C 77, 54610 (2008).

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