A.P. Tonchev, C. Angell, M. Boswell, C.R. Howell, H.J. Karwowski, J.H. Kelley, W. Tornow, N. Tsoneva. Low-Energy Dipole Modes of Excitation Below the Neutron Separation Energy. Prepared for publication in Phys. Rev. C.

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, and W. Tornow, J. A. Becker, D. Dashdorj, J. Kenneally, R. A. Macri, M. A. Stoyer, and C. Y. Wu, E. Bond, M. B. Chadwick, J. Fitzpatrick, T. Kawano, R. S. Rundberg, A. Slemmons, D. J. Vieira, and J. B. Wilhelmy. Measurement of the 241Am(n, 2n) reaction cross section from 7.6 MeV to 14.5 MeV. Phys. Rev. C in press (2008).

C. D. Bowman, D. C. Bowman, T. Hill, J. Long, A. P. Tonchev, W. Tornow, F. Trouw, Sven Vogel, R. L. Walter, S. Wender, V. Yuan. Measurements of Thermal Neutron Diffraction and Inelastic Scattering in Reactor-Grade Graphite . Nuclear Science and Engineering. v. 159, p. 182 (2008).

A. Hutcheson, C.T. Angell, J.A. Becker, M. Boswell, A.S. Crowell, D. Dashdorj, B. Fallin, N. Fotiades, C.R. Howell, H.J. Karwowski, J.H. Kelley, M. Kiser, R.A. Macri, R.O. Nelson, R.S. Pedroni, A.P. Tonchev, W. Tornow, D.J. Vieira, G.J. Weisel, J.B. Wilhelmy . Pulsed and monoenergetic beams for neutron cross-section measurements using activation and scattering techniques at Triangle Universities Nuclear Laboratory . Nucl. Instr. and Methods in Phys. Res. B 261, 369 (2007).

T.C. Li, N. Pietralla, A.P. Tonchev,M. Ahmed, T. Ahn, C. Angell, M. Blackston, A. Costin, K. Keeter, J. Li, Y. Parpottas, B. Perdue, I.V. Pinayev, G. Rainovski, W. Tornow, H.R. Weller, Y.K. Wu. Search for magnetic dipole excitation strength in 40Ar . Phys. Rev. C 73, 054306 (2006).

A. Sabourov, M.W. Ahmed, M.A. Blackston, A.S. Crowell, C.R. Howell, B.A. Perdue, K. Sabourov, A. Tonchev, H.R. Weller, R. M. Prior, M.C. Spraker, B. Braizinha, N. Kalantar-Nayestanaki. The 7Li(d,n0)8Be and 7Li(d,n1)8Be reactions below 160 keV . Phys. Rev. C 74 064611 (2006).

A. Sabourov, M. W. Ahmed, M. A. Blackston, A. S. Crowell, C. R. Howell, B. A. Perdue, K. Sabourov, A. Tonchev, H. R. Weller, R. M. Prior, and M. C. Spraker. Astrophysical S factor for the 7Li(d,n0)8Be and 7Li(d,n1)8Be reactions, Phys. Rev. C 73, 015801 (2006).

A.P. Tonchev, M. Boswell, C.R. Howell, H.J. Karwowski, J.H. Kelley, W. Tornow, Y.K. Wu. The High Intensity Gamma-Ray Source (HIGS) and Recent Results. Nucl. Instr. and Methods in Phys. Res. B 241, 51474 (2005).

D. Savran, S. Muller, A. Zilges, M. Babilon, M.W. Ahmed, J.H. Kelley, A. Tonchev, W. Tornow, H.R. Weller, N. Pietralla, J. Li, I. V. Pinayev, Y. K. Wu. Parity assignments in 172,174Yb using polarized photons and the K quantum number in rare earth nuclei. Phys. Rev. C 71 034304 (2005).

B.A. Perdue, M.W. Ahmed, A.P. Tonchev, H.R. Weller, G. Feldman, V.N. Litvinenko, I.V. Pinayev, B.E. Norum, R.M. Prior, M.C. Spraker, B.D. Sawatzky. Compton scattering of polarized g-rays by 16O for E = 25-40 MeV. Phys. Rev. C 70, 064305 (2004).

R.M. Prior, M.C. Spraker, A.M. Amthor, K.J. Keeter, S.O. Nelson, A. Sabourov, K. Sabourov, A. Tonchev, M. Ahmed, J.H. Kelley, D.R. Tilley, H.R. Weller, and H.M. Hofmann. Energy dependence of the astrophysical S-factor for the 6Li(p,g)7Be reaction. Phys. Rev. C 70, 055801 (2004).

K. Sabourov, M.W. Ahmed, S.R. Canon, B. Crowley, K. Joshi, J.H. Kelley, S.O. Nelson, B.A. Perdue, E.C. Schreiber, A. Sabourov, A. Tonchev, H.R. Weller, E.A. Wulf, R.M. Prior, M.C. Spraker, H.M. Hofmann, M. Trini. Experimental and theoretical study of the 2H(d,g)4He reaction below Ec.m. = 60 keV. Phys. Rev. C 70, 064601 (2004).

C. Fransen, N. Pietralla, A.P. Tonchev, M.W. Ahmed, J. Chen, G. Feldman, U. Kneissl, J. Li, V.N. Litvinenko, B. Perdue, I.V. Pinayev, H.H. Pitz, R. Prior, K. Sabourov, M. Spraker, W. Tornow, H. R. Weller, V. Werner, Y. K. Wu, and S. W. Yates. Parity assignment to strong dipole excitations of 92Zr and 96Mo. Phys. Rev. C 70, 044317 (2004).

M.W. Ahmed, G. Feldman, V.N. Litvinenko, S.O. Nelson, B.E. Norum, B. Perdue, I.V. Pinayev, B. Sawatzky, A.P. Tonchev, Y. Wu and H.R. Weller. Background reduction in FEL-generatedg-ray beam experiments using giant high-peak power pulses, Nucl. Instr. and Methods in Phys. Res. A 516, 440 (2004).

A.P. Tonchev, S.O. Nelson, K. Sabourov, B.T. Crowley, K. Joshi, H.R. Weller, J.H. Kelley, R.M. Prior, M. Spraker, N. Kalantar-Nayestanaki. The 10B(p,g)11C Reaction at Astrophysically Relevant Energies. Phys. Rev. C 68, 045803 (2003).

S.O. Nelson, M.W. Ahmed, B.A. Perdue, K. Sabourov, A.L. Sabourov, A.P. Tonchev, R.M. Prior, M. Spraker, and H.R. Weller. Analyzing power measurement for the 14N(p,g)15O reaction at astrophysically relevant energies. Phys. Rev. C 68, 065804 (2003).

N. Pietralla, V.N. Litvinenko, S. Hartman, F.F. Mikhailov, I.V. Pinayev, G. Swift, M.W. Ahmed, J.H. Kelley, S.O. Nelson, R. Prior, K. Saburov, A.P. Tonchev, H.R. Weller. Identification of the Jp = 1- two-phonon state of 88Sr. Phys. Rev. C 65 (2002) 047305.

N. Pietralla, H.R. Weller, V.N. Litvinenko, M.W. Ahmed, A.P. Tonchev. Parity measurements of nuclear dipole excitations using FEL-generated g-rays at HIGS. Nucl. Instr. and Methods in Phys. Res. A 483 (2002) 556.

N. Pietralla, H.R. Weller, V.N. Litvinenko, M.W. Ahmed, and A.P. Tonchev. Parity Measurements of Nuclear Dipole Excitations using FEL generated Gamma Rays at HIGS. Phys. Rev. Lett. 88 (2002) 012502.

C.D. Nesaraja, C.R. Brune, B.T. Crowley, J.H. Kelly, S.O. Nelson, R.M. Prior, K. Sabourov, D.R. Tilley, A. P. Tonchev, and H.R. Weller. The ratio of S factor for (p,g) reactions on 12C and 13C at astrophysically relevant energies. Phys. Rev. C 64 (2001) 065804.

N. Tsoneva, Ch. Stoyanov, Yu. P. Gangrsky, V. Yu. Ponomarev, N. P. Balabanov, A.P. Tonchev. Population of Isomers in Decay of Giant Dipole Resonance. Phys. Rev. C 61 (2000) 044303.

A.P. Tonchev and J.F. Harmon. Photoproduction of the 180mTa Isomer and its Astrophysical Relevance. Applied Radiation and Isotopes, 52 (2000) 873-882.

A.P. Tonchev, Yu.P. Gangrsky, A.G. Belov. New Candidates for High Spin Isomeric Targets. Nucl. Instr. and Methods in Phys. Res. A, 422(1999) 532-535.

A.P. Tonchev, J.F. Harmon, B. King. Application of Low Energy Photon Spectroscopy in Isomer Production of Hf, W, Ir, Pt, Au and Hg Using (g,g') Reactions from 6-9 MeV. Nucl. Instr. and Methods in Phys. Res. A 422 (1999) 510-512.

A.P. Tonchev, J.F. Harmon, R. Brey. Linac Analysis of Ore Samples by Employing Photon Activation of the Metastable States of Gold and Silver. Nucl. Instr. and Methods in Phys. Res. A 422 (1999) 926-928.

Yu.P.Gangrsky, P.Zuzaan, N.N.Kolesnikov, V.G.Lukashek, A.P.Tonchev. Isomeric Ratios in (g,p) Reactions at Dipole Resonance Energies. Physics of Atomic Nuclei, 62 (1999) 1615-1620.

A.P. Tonchev, Yu.P. Gangrsky, A.G. Belov, and V.E. Zhuchko. Deformation on Isomeric Excitation of Eu Isotopes in (g,n) and (n,g) Reactions. Phys. Rev. C, 58 (1998) 2851-2857.

Yu.P. Gangrskii, V.E. Zhuchko, Novgorodov A.F., Tonchev A.P. Isomers High-Enriched Targets for Nuclear Reactions. Radiochemistry, 40 (1998) 434-437.

A.G. Belov, Yu.P. Gangrsky, A.P. Tonchev, P. Zuzaan. Excitation of the High-spin 180Hf Isomer and Deexcitation of the 180Ta Isomer in (g,g') Reactions. Hyperfine Interactions, 107 (1997) 167-173.

A.G. Belov, Yu.P. Gangrsky, A.P. Tonchev, V.E. Zhuchko. Excitation of Isomeric States in (g,n) and (n,g) Reactions on Eu Isotopes. Physics of Atomic Nuclei, 60 (1997) 1773-1779; Yad. Fiz. 60 (1997) 1940-1947 (in Rissian).

A.G. Belov, Yu.P. Gangrsky, A.P. Tonchev, P. Zuzaan. Excitation of High-Spin Isomeric States in Inelastic Gamma Scattering. Bull. Acad. Sci. Russia, Physical issue 61 (1997) 19-24; Izv. Akad. Nauk SSSR, Ser.Fiz. 61 (1997) 193-199 (in Russian).

Yu.P. Gangrsky, A.P. Tonchev, N.P. Balabanov. Excitation of Isomeric States in Photonuclear Reactions. Phys. Part. Nucl. 27 (1996) 428-452; Fiz. Elem. Chastits At. Yadra 27 (1996) 1043-1098 (in Russian).

A.G. Belov, Yu.P. Gangrsky, A.P. Tonchev, N.P. Balabanov. Excitation of Isomeric 1h11/2 States in the Reactions (g,n). Physics of Atomic Nuclei 59 (1996) 553-559; Yad. Fiz. 59 (1996) 585-591 (in Russian).

A.G. Belov, Yu.P. Gangrsky, A.P. Tonchev and N.P. Balabanov, H.G. Hristov. Measurement of Isomeric Ratios in the Reaction (g,n) on Barium Isotopes in the Giant Dipole Resonance Region. Physics of Atomic Nuclei 59 (1996) 367-371; Yad. Fiz. 59 (1996) 389-394 (in Russian).

Ph.G. Kondev, A.P. Tonchev, Kh.G. Khristov, and V.E. Zhuchko. Calculations of the Bremsstrahlung Spectra from Thick Tungsten Target as a Function of Photon Energy and Angle. Nucl. Instr. and Methods in Phys. Res. B71 (1992) 126-131.

A.P. Tonchev, Ph.G. Kondev, H.G. Hristov, Yu.P. Gangrskyi, N.P. Balabanov, V.D. Tcholakov. Isomeric Yield Ratio of 134I in Photofission of 232Th and 238U. J. Radioanal. Nucl. Chem. Letters 155 (1991) 299-309.

A.D. Antonov, N.P. Balabanov, Ch.G. Christov, Yu.P. Gangrskyi, F.G. Kondev, S.G. Marinova, A.P. Tonchev, V.D. Tcholakov. Excitation Functions of the (g,a) Photonuclear Reactions in the Giant Resonance Region. Bull. Acad. Sci. USSR, Physical issue 55 (1991) 176-180; Izv. Akad. Nauk SSSR, Ser.Fiz. 55 (1991) 2260-2264 (in Russian).

A.P. Tonchev, B. Glaisberg, Ch.G. Christov, F.G. Kondev, L.P. Kulkina, N.P. Balabanov, V.D. Tcholakov. Gamma Activation Analysis of Rare Earth Elements in Uranium Rocks. Isotopenpraxis 27 (1991) 384-387.

A.D. Antonov, N.P. Balabanov, Ch.G. Christov, Yu.P. Gangrskyi, F.G. Kondev, S.G. Marinova, A.P. Tonchev, V.D. Tcholakov. Measurements of the Integral Cross Sections for (g, a) Reactions in the Giant Resonance Region. Sov. J. Nucl. Phys. 53 (1991) 9-12; Yad. Fiz. 53 (1991) 14-19 (in Russian).

A.D. Antonov, N.P. Balabanov, Ch.G. Christov, Yu.P. Gangrskyi, F.G. Kondev, S.G. Marinova, A.P. Tonchev, V.D. Tcholakov. The Excitation Function of the 65Cu(g,a)61Co Reaction in the Giant Resonance Region. Physica B (Polonica) 21 (1990) 1041-1048.