NSR Query Results
Output year order : Descending NSR database version of April 11, 2024. Search: Author = A.P.Tonchev Found 83 matches. 2023JO08 Phys.Rev. C 108, 024315 (2023) S.R.Johnson, R.V.F.Janssens, U.Friman-Gayer, B.A.Brown, B.P.Crider, S.W.Finch, Krishichayan, D.R.Little, S.Mukhopadhyay, E.E.Peters, A.P.D.Ramirez, J.A.Silano, A.P.Tonchev, W.Tornow, S.W.Yates Testing shell-model interactions at high excitation energy and low spin: Nuclear resonance fluorescence in 74Ge NUCLEAR REACTIONS 74Ge(polarized γ, γ'), E=3.1-5.44 MeV; measured Eγ, Iγ, γ(θ); deduced integrated exclusive scattering σ(E). 74Ge; deduced levels, J, π, branching ratios, transition intensities. Comparison to large-scale shell-model calculations with jj44b and JUN45 effective interactions. γ3-setup consisting of 6 HPGe detectors. Quasi-monoenergetic linearly polarized photon beams produced via Compton backscattering and provided by the High Intensity Gamma-Ray Source at TUNL.
doi: 10.1103/PhysRevC.108.024315
2023MA16 Appl.Radiat.Isot. 195, 110742 (2023) A.M.Marenco, G.Rusev, E.M.Bond, T.A.Bredeweg, S.W.Finch, J.R.Garcia, M.E.Gooden, Krishichayan, R.C.Malone, W.A.Moody, A.P.D.Ramirez, J.A.Silano, A.P.Tonchev, W.Tornow Cross section for inelastic neutron scattering from 193Ir at 6 MeV NUCLEAR REACTIONS 193Ir, Ir(n, n')193mIr, E=6 MeV; measured reaction products, X-rays; deduced σ. Comparison with available data, ENDF/B-VIII.0 library. The tandem lab of TUNL.
doi: 10.1016/j.apradiso.2023.110742
2023RA05 Phys.Rev. C 107, 054608 (2023) A.P.D.Ramirez, J.A.Silano, R.C.Malone, M.A.Stoyer, A.P.Tonchev, M.E.Gooden, J.B.Wilhelmy, S.W.Finch, C.R.Howell, Krishichayan, W.Tornow Fission product yields from the 238U(n, f) reaction at En = 4.6 MeV NUCLEAR REACTIONS 238U(n, F)86mKr/86Kr/88Kr/89Rb/91Sr/92Sr/94Y/97Nb/101Mo/104Tc/105Ru/129Sb/131Te/131Sb/133I/134Te/134I/135Xe/138Xe/138Cs/139Ba/141Ba/142Ba/142La/146Ce/146Pr/147Pr/84As/86Se/86Br/87Br/88Br/89Kr/90Kr/91Kr/91Rb/92Kr/93Kr/93Rb/93Sr/94Rb/94Sr/95Sr/96Sr/96mY/96Y/97mY/98Sr/98mY/99Zr/99Nb/100Y/100Zr/101Zr/101Nb/102Zr/103Tc/106Tc/130Sn/132Sn/133Sb/134mSb/135Te/136Te/136mI/137Xe/138I/139Xe/140Xe/140Cs/141Xe/142Cs/142Ba/143Cs/143Ba/144La/145Ce/148La, E=4.6 MeV; measured neutron time-of-flight, Eγ, Iγ; deduced cumulative fission product yields. Comparison to experimental and evaluated data from ENDF/B-VIII.0 and JEFF-3.3 libraries and with theoretical models using the GEF and FREYA codes. Cyclic activation technique using the RApid Belt-driven Irradiated Target Transfer System (RABITTS) at the 10 MV tandem Van de Graaff accelerator (TUNL).
doi: 10.1103/PhysRevC.107.054608
2023SC05 Phys.Rev. C 107, 044312 (2023) N.Schunck, M.Verriere, G.Potel Aguilar, R.C.Malone, J.A.Silano, A.P.D.Ramirez, A.P.Tonchev Microscopic calculation of fission product yields for odd-mass nuclei NUCLEAR REACTIONS 236,238U(n, F), E=2.2-7.2 MeV; calculated mass distribution of the light fission fragment before prompt emission, fission fragment mass distribution after neutron emission, ratio of neutron over proton numbers in the fission fragments, axial quadrupole and octupole deformation in the fission fragments, probability to populate a given spin projection. Hartree-Fock-Bogoliubov theory with Skyrme energy functionals combined with FREYA calculations. Comparison to available experimental data, GEF-2021/1.1 calculations and ENDF/B-VIII.0, JEFF-3.3, and JENDL-5 evaluations. NUCLEAR STRUCTURE 237,239U; calculated levels, J, π, spectrum of quasi-bound states for each spin projection, potential energy curves in as a function of the axial quadrupole moment. Generator coordinate method with Gaussian overlap approximation.
doi: 10.1103/PhysRevC.107.044312
2022HO01 J.Phys.(London) G49, 010502 (2022) C.R.Howell, M.W.Ahmed, A.Afanasev, D.Alesini, J.R.M.Annand, A.Aprahamian, D.L.Balabanski, S.V.Benson, A.Bernstein, C.R.Brune, J.Byrd, B.E.Carlsten, A.E.Champagne, S.Chattopadhyay, D.Davis, E.J.Downie, J.M.Durham, G.Feldman, H.Gao, C.G.R.Geddes, H.W.Griesshammer, R.Hajima, H.Hao, D.Hornidge, J.Isaak, R.V.F.Janssens, D.P.Kendellen, M.Kovash, P.P.Martel, U.-G.Meissner, R.Miskimen, B.Pasquini, D.R.Phillips, N.Pietralla, D.Savran, M.R.Schindler, M.H.Sikora, W.M.Snow, R.P.Springer, C.Sun, C.Tang, B.Tiburzi, A.P.Tonchev, W.Tornow, C.A.Ur, D.Wang, H.R.Weller, V.Werner, Y.K.Wu, J.Yan, Z.Zhao, A.Zilges, F.Z.Zomer International workshop on next generation gamma-ray source
doi: 10.1088/1361-6471/ac2827
2022TO13 Phys.Lett. B 835, 137576 (2022) W.Tornow, A.P.Tonchev, S.W.Finch, Krishichayan, X.B.Wang, A.C.Hayes, H.G.D.Yeomans, D.A.Newmark Neutral-current neutrino cross section and expected supernova signals for 40Ar from a three-fold increase in the magnetic dipole strength NUCLEAR REACTIONS 40Ar(γ, γ'), E=9.4-10.2 MeV; measured reaction products, Eγ, Iγ; calculated the neutral-current neutrino σ using shell model; deduced γ-ray energies, J, π, resonance parameters, B(M1), B(E1). The Nuclear Resonance Fluorescence (NRF) technique, the High-Intensity Gamma-Ray Source (HIγS) of the Triangle Universities Nuclear Laboratory (TUNL).
doi: 10.1016/j.physletb.2022.137576
2021KO09 Nucl.Instrum.Methods Phys.Res. A1000, 165240 (2021) 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, S.Zhu New approach to precisely measure γ-ray intensities for long-lived fission products, with results for the decay of 95Zr RADIOACTIVITY 95Zr, 95Nb, 95Sr, 95Y(β-); measured decay products, Eγ, Iγ, Eβ, Iβ, β-γ-coin.; deduced γ-ray energies and intensities, β-branching ratios. Comparison with a Monte Carlo decay code simulations. CARIBU facility, the reactor facility at TAMU.
doi: 10.1016/j.nima.2021.165240
2021MA62 Phys.Lett. B 820, 136569 (2021) K.R.Mashtakov, V.Yu.Ponomarev, M.Scheck, S.W.Finch, J.Isaak, M.Zweidinger, O.Agar, C.Bathia, T.Beck, J.Beller, M.Bowry, R.Chapman, M.M.R.Chishti, U.Friman-Gayer, L.P.Gaffney, P.E.Garrett, E.T.Gregor, J.M.Keatings, U.Koster, B.Loher, A.D.MacLean, D.O'Donnell, H.Pai, N.Pietralla, G.Rainovski, M.Ramdhane, C.Romig, G.Rusev, D.Savran, G.S.Simpson, J.Sinclair, K.Sonnabend, P.Spagnoletti, A.P.Tonchev, W.Tornow Structure of high-lying levels populated in the 96Y → 96Zr β decay RADIOACTIVITY 96Y(β-) [from 235U(n, F), E thermal]; measured decay products, Eγ, Iγ, Eβ, Iβ; deduced γ-ray energies, B(E1), branching ratios, Gamow-Teller transition probabilities B(GT). Quasiparticle Phonon Model. Institut Laue Langevin (ILL), LOHENGRIN separator.
doi: 10.1016/j.physletb.2021.136569
2019KR10 Phys.Rev. C 100, 014608 (2019) Krishichayan, M.Bhike, C.R.Howell, A.P.Tonchev, W.Tornow Fission product yield measurements using monoenergetic photon beams NUCLEAR REACTIONS 235,238U, 239Pu(polarized γ, F)84Br/85mKr/87Kr/88Kr/91Sr/92Sr/92Y/93Y/94Y/95Zr/97Zr/99Mo/103Ru/104Tc/105Ru/105Rh/115Cd/127Sb/128Sn/129Sb/130Sb/131Sb/131I/132Te/132Cs/133Te/133I/134Te/135I/136Cs/138Cs/139Ba/140Ba/141Ba/141Ce/142La/143Ce/146Pr/147Nd/149Nd/151Pm, E=13 MeV; measured fission fragments, Eγ, Iγ, fission product yields (FPY) using dual fission chamber for fission fragments and offline γ detection at TUNL-HIγS facility. Comparison with previous experimental neutron- and photon-induced fission product yields. RADIOACTIVITY 91,92Sr, 142La(β-)[from 235,238U, 239Pu(polarized γ, F), E=13 MeV at TUNL-HIγS facility]; measured half-lives of decay of 91Sr, 92Sr, and 142La, and compared with values from ENSDF database at NNDC.
doi: 10.1103/PhysRevC.100.014608
2019SH01 Nature(London) 565, 328 (2019) J.A.Shusterman, N.D.Scielzo, K.J.Thomas, E.B.Norman, S.E.Lapi, C.S.Loveless, N.J.Peters, J.D.Robertson, D.A.Shaughnessy, A.P.Tonchev The surprisingly large neutron capture cross-section of 88Zr NUCLEAR REACTIONS 88Zr(n, γ), E thermal; measured reaction products, Eγ, Iγ; deduced σ.
doi: 10.1038/s41586-018-0838-z
2018KR03 Phys.Rev. C 98, 014608 (2018), Erratum Phys.Rev. C 107, 039906 (2023) Krishichayan, S.W.Finch, C.R.Howell, A.P.Tonchev, W.Tornow Monoenergetic photon-induced fission cross-section ratio measurements for 235U, 238U, and 239Pu from 9.0 to 17.0 MeV NUCLEAR REACTIONS 235,238U, 239Pu(polarized γ, F), E=9.0-17.0 MeV; measured fission fragments, photofission σ(E), cross sections ratios for the target nuclei using dual-fission ionization chamber (DFC), and quasimonoenergetic Compton backscattered photon beam from HIγS facility of TUNL. Comparison with previous experimental values, with evaluated data in ENDF/B-VII.1 library, and with theoretical calculations using TENDL-2009 code.
doi: 10.1103/PhysRevC.98.014608
2018TO09 Phys.Rev. C 98, 064305 (2018) W.Tornow, M.Bhike, S.W.Finch, Krishichayan, A.P.Tonchev Measurement of the 115In (γ, γ') 115mIn inelastic scattering cross section in the 1.8 to 3.7 MeV energy range with monoenergetic photon beams NUCLEAR REACTIONS 115In(γ, γ')115mIn, E=1.8-3.7 MeV; measured Eγ, Iγ, σ(E) for the 336-keV isomer in 115In at the High-Intensity Gamma-ray Source (HIγS) of TUNL. Comparison with different TALYS-1.9 evaluations. 115In(γ, n), E=9-25 MeV; calculated σ(E) using TALYS-1.9 code with the default values and with the Gogny D1M HFB+QRPA model for the level density, E1 and M1 strengths.
doi: 10.1103/PhysRevC.98.064305
2017BH03 Phys.Rev. C 95, 024608 (2017) M.Bhike, W.Tornow, Krishichayan, A.P.Tonchev Exploratory study of fission product yield determination from photofission of 239Pu at 11 MeV with monoenergetic photons NUCLEAR REACTIONS 239Pu(γ, F)91Sr/92Sr/97Zr/99Mo/133I/134I/138Cs/143Ce, E=11 MeV from Compton back-scattering of free electron laser (FEL) photons at TUNL High Intensity Gamma-Ray Source (HIγS); measured off-line Eγ, Iγ, cumulative fission product yields (FPYs). Comparison with experimental yields from neutron-induced fission and photon-induced fission for Eγ(max)=28 MeV.
doi: 10.1103/PhysRevC.95.024608
2017KR02 Nucl.Instrum.Methods Phys.Res. A854, 40 (2017) Krishichayan, M.Bhike, S.W.Finch, C.R.Howell, A.P.Tonchev, W.Tornow Photofission cross-section ratio measurement of 235U/238U using monoenergetic photons in the energy range of 9.0-16.6 MeV NUCLEAR REACTIONS 235,238U(γ, F), E=9.0-16.6 MeV; measured fission fragments, Eγ, Iγ; deduced fission σ ratio. Comparison with experimental and ENDF/B-VII.1 evaluated data.
doi: 10.1016/j.nima.2017.02.043
2017KR09 Phys.Rev. C 96, 044623 (2017) Krishichayan, M.Bhike, W.Tornow, A.P.Tonchev, T.Kawano Accurate 238U (n, 2n) 237U reaction cross-section measurements from 6.5 to 14.8 MeV NUCLEAR REACTIONS 238U(n, 2n)237U, E=6.34, 6.89, 7.40, 7.87, 8.38, 8.89, 9.40, 9.91, 10.41, 10.92, 11.42, 11.93, 12.43, 13.60, 14.10, 14.8 MeV; 197Au(n, 2n)196Au, E=9.91, 10.41, 10.92, 11.42, 11.93, 12.43, 13.60, 14.10, 14.80 MeV; 27Al(n, α)24Na, E=6.34, 6.89, 7.40, 7.87, 8.38, 8.89, 9.40 MeV; measured Eγ, Iγ, σ(E) by activation method at the FN Tandem Accelerator of the Triangle Universities Nuclear Laboratory (TUNL). 237U, 196Au, 24Na; measured half-lives of the decays of the ground states from γ-decay curves, and compared with literature values. Comparison of cross section data with previous measurements, evaluated data in ENDF/B-VIII.b4, JEFF-3.2, JENDL-4.0, BROND-2.2, CENDL-3.1, ROSFOND-2010, Zolotarev and Zhou You-Pu libraries, and with Hauser-Feshbach model based theoretical calculation.
doi: 10.1103/PhysRevC.96.044623
2017TO16 Phys.Lett. B 773, 20 (2017) A.P.Tonchev, N.Tsoneva, C.Bhatia, C.W.Arnold, S.Goriely, S.L.Hammond, J.H.Kelley, E.Kwan, H.Lenske, J.Piekarewicz, R.Raut, G.Rusev, T.Shizuma, W.Tornow Pygmy and core polarization dipole modes in 206Pb: Connecting nuclear structure to stellar nucleosynthesis NUCLEAR REACTIONS 208Pb(γ, γ'), E=4.9-8.1 MeV; analyzed available data; deduced a range for the neutron-skin thickness of and a corresponding range for the slope of the symmetry energy, Maxwellian-averaged radiative σ.
doi: 10.1016/j.physletb.2017.07.062
2016CH04 Phys.Rev. C 93, 014611 (2016) B.Champine, M.E.Gooden, Krishichayan, E.B.Norman, N.D.Scielzo, M.A.Stoyer, K.J.Thomas, A.P.Tonchev, W.Tornow, B.S.Wang Measurement of the 169Tm(n, 3n)167Tm cross section and the associated branching ratios in the decay of 167Tm NUCLEAR REACTIONS 169Tm(n, 3n), 58Ni, 90Zr, 169Tm(n, 2n), 94Zr(n, α), E=17.35, 18.34, 19.33, 20.32, 21.31 MeV, [quasimonoenergetic neutrons from 2H(d, n), E=15.0-19.2 at TUNL tandem Van de Graaff accelerator]; measured neutron spectra, Eγ, Iγ, σ(E) by activation method. Comparison with previous experimental data, compiled data in EXFOR database and evaluated data in ENDF database. Relevance to measurement of yield of reaction-in-flight neutrons at the LLNL National Ignition Facility (NIF). RADIOACTIVITY 167Tm(EC)[from 165Ho(α, 2n), E=29 MeV at LBNL cyclotron facility]; measured Eγ, Iγ, I(x rays), source activity; deduced branching ratios of 207.8-keV and 531.5-keV γ rays. Comparison with previous experimental values and evaluated data.
doi: 10.1103/PhysRevC.93.014611
2016GO02 Nucl.Data Sheets 131, 319 (2016) M.E.Gooden, C.W.Arnold, J.A.Becker, C.Bhatia, M.Bhike, E.M.Bond, T.A.Bredeweg, B.Fallin, M.M.Fowler, C.R.Howell, J.H.Kelley, Krishichayan, R.Macri, G.Rusev, C.Ryan, S.A.Sheets, M.A.Stoyer, A.P.Tonchev, W.Tornow, D.J.Vieira, J.B.Wilhelmy Energy Dependence of Fission Product Yields from 235U, 238U and 239Pu for Incident Neutron Energies Between 0.5 and 14.8 MeV NUCLEAR REACTIONS 235,238U, 239Pu(n, F), E=0.5-14.8 MeV; measured reaction products, Eγ, Iγ; deduced fission yields.
doi: 10.1016/j.nds.2015.12.006
2016LO04 Phys.Lett. B 756, 72 (2016) B.Loher, D.Savran, T.Aumann, J.Beller, M.Bhike, N.Cooper, V.Derya, M.Duchene, J.Endres, A.Hennig, P.Humby, J.Isaak, J.H.Kelley, M.Knorzer, N.Pietralla, V.Yu.Ponomarev, C.Romig, M.Scheck, H.Scheit, J.Silva, A.P.Tonchev, W.Tornow, F.Wamers, H.Weller, V.Werner, A.Zilges The decay pattern of the Pygmy Dipole Resonance of 140Ce NUCLEAR REACTIONS 140Ce(γ, γ'), (γ, γ), E=6.5 MeV; measured reaction products, Eγ, Iγ; deduced elastic scattering σ, average branching ratio to excited states for 140Ce, Pygmy Dipole Resonance (PDR) couple to the ground state as well as to low-lying excited states, PDR mixing. Comparison with nuclear model calculations.
doi: 10.1016/j.physletb.2016.02.042
2015BE02 Phys.Lett. B 741, 128 (2015) J.Beller, C.Stumpf, M.Scheck, N.Pietralla, D.Deleanu, D.M.Filipescu, T.Glodariu, W.Haxton, A.Idini, J.H.Kelley, E.Kwan, G.Martinez-Pinedo, R.Raut, C.Romig, R.Roth, G.Rusev, D.Savran, A.P.Tonchev, W.Tornow, J.Wagner, H.R.Weller, N.-V.Zamfir, M.Zweidinger Separation of the 1+/1- parity doublet in 20Ne NUCLEAR REACTIONS 20Ne, 28Si(polarized γ, γ'), E=11.26 MeV; measured reaction products, Eγ, Iγ; deduced the energy difference of the parity doublet, the ratio of their integrated σ. Comparison with shell model calculations.
doi: 10.1016/j.physletb.2014.12.018
2015BH09 Phys.Rev. C 91, 064604 (2015) C.Bhatia, B.F.Fallin, M.E.Gooden, C.R.Howell, J.H.Kelley, W.Tornow, C.W.Arnold, E.Bond, T.A.Bredeweg, M.M.Fowler, W.Moody, R.S.Rundberg, G.Y.Rusev, D.J.Vieira, J.B.Wilhelmy, J.A.Becker, R.Macri, C.Ryan, S.A.Sheets, M.A.Stoyer, A.P.Tonchev Exploratory study of fission product yields of neutron-induced fission of 235U, 238U, and 239Pu at 8.9 MeV NUCLEAR REACTIONS 235,238U, 239Pu(n, F), E=8.9 MeV; measured Eγ, Iγ of fission products of 92Sr, 97Zr, 99Mo, 105Ru, 132Te, 133I, 140Ba, 143Ce, 147Nd at TUNL facility; deduced absolute fission product yields by γ activation method. Comparison with previous experimental results.
doi: 10.1103/PhysRevC.91.064604
2015KR04 Phys.Rev. C 91, 044328 (2015) Krishichayan, M.Bhike, W.Tornow, G.Rusev, A.P.Tonchev, N.Tsoneva, H.Lenske Polarized photon scattering off 52Cr Determining the parity of J=1 states NUCLEAR REACTIONS 52Cr(polarized γ, γ'), E=5.21, 5.56, 6.40, 6.50, 7.00, 7.08, 7.19, 7.40, 7.51, 7.74, 7.89, 8.02, 8.11, 8.20, 8.75, 8.95, 9.15, 9.25, 9.36, 9.45 MeV; measured Eγ, Iγ, linear polarization using High Intensity γ-Ray Source (HIγS) facility of TUNL. 52Cr; deduced levels, J, π, B(M1), B(E1), E1 and M1 strength functions, spin-flip M1 resonance structure around 9.1 MeV, fragmentation pattern of the dipole strength below and around the neutron emission threshold, new mode of excitation related to pygmy dipole resonance (PDR). Comparison with calculations using three-phonon quasiparticle phonon model (QPM) with self-consistent energy-density functional theory.
doi: 10.1103/PhysRevC.91.044328
2014BE09 Acta Phys.Pol. B45, 193 (2014) N.Benouaret, J.Beller, J.Isaak, J.H.Kelley, H.Pai, N.Pietralla, V.Yu.Ponomarev, R.Raut, C.Romig, G.Rusev, D.Savran, M.Scheck, L.Schnorrenberger, K.Sonnabend, A.P.Tonchev, W.Tornow, H.R.Weller, M.Zweidinger Photoexcitation of the Stable Tl Isotopes Below the Neutron Separation Energy NUCLEAR REACTIONS 203,205Tl(γ, γ'), E<7.5 MeV; measured reaction products, Eγ, Iγ; deduced dipole strength distribution. Comparison with available data.
doi: 10.5506/APhysPolB.45.193
2014BH10 Nucl.Data Sheets 119, 176 (2014) C.Bhatia, M.E.Gooden, W.Tornow, A.P.Tonchev Measurements of the (n, 2n) Reaction Cross Section of 181Ta from 8 to 15 MeV NUCLEAR REACTIONS 181Ta(n, 2n), E=8-15 MeV; measured activation Eγ, Iγ; deduced γ transitions, σ. Compared with other data, ENDF/B-VII.1, TUNL-2012 and TENDL-2011.
doi: 10.1016/j.nds.2014.08.049
2014DE04 Phys.Lett. B 730, 288 (2014) V.Derya, D.Savran, J.Endres, M.N.Harakeh, H.Hergert, J.H.Kelley, P.Papakonstantinou, N.Pietralla, V.Yu.Ponomarev, R.Roth, G.Rusev, A.P.Tonchev, W.Tornow, H.J.Wortche, A.Zilges Isospin properties of electric dipole excitations in 48Ca NUCLEAR REACTIONS 48Ca(polarized γ, γ'), E=6.6-9.51 MeV; 40,48Ca, 16O(α, α'γ), E=136 MeV; measured reaction products, Eγ, Iγ; deduced B(E1), J, π. Comparison with RPA calculations, available data.
doi: 10.1016/j.physletb.2014.01.050
2014DE13 Phys.Rev. C 89, 055802 (2014) R.J.de Boer, A.Best, J.Gorres, K.Smith, W.Tan, M.Wiescher, R.Raut, G.Rusev, A.P.Tonchev, W.Tornow Photoneutron strengths in 26Mg at energies of astrophysical interest NUCLEAR REACTIONS 26Mg(polarized γ, n), [circularly polarized γ beam produced in Compton backscattering of laser photons from E=498-548 MeV electrons], E=10.80-12.05 MeV; measured Eγ, Iγ, E(n), I(n), time-of-flight spectra, photoneutron σ(E) at HIγS facility of TUNL. 26Mg; deduced level energies above S(n), resonance strengths, comparison with 25Mg(n, γ)26Mg by R-matrix analysis. Relevance to astrophysically important 22Ne(α, n)25Mg reaction.
doi: 10.1103/PhysRevC.89.055802
2014GO18 Nucl.Data Sheets 119, 121 (2014) M.E.Gooden, B.A.Fallin, S.W.Finch, J.H.Kelley, C.R.Howell, G.Rusev, A.P.Tonchev, W.Tornow, V.Stanislav Partial Cross Sections of Neutron-Induced Reactions on natCu at En = 6, 8, 10, 12, 14, and 16 MeV for Oνββ Background Studies NUCLEAR REACTIONS 63,65Cu(n, n'γ), E=6, 8, 10, 12, 14, 16 MeV; measured Eγ, Iγ(θ) using HPGe; deduced discrete level gated σ using γ ray angular distribution from Dicebox code; calculated discrete level gated σ using TALYS. Compared with ENDF/B-VII.1 and LANL data. Preliminary.
doi: 10.1016/j.nds.2014.08.034
2014MA05 Phys.Rev.Lett. 112, 072501 (2014) R.Massarczyk, R.Schwengner, F.Donau, S.Frauendorf, M.Anders, D.Bemmerer, R.Beyer, C.Bhatia, E.Birgersson, M.Butterling, Z.Elekes, A.Ferrari, M.E.Gooden, R.Hannaske, A.R.Junghans, M.Kempe, J.H.Kelley, T.Kogler, A.Matic, M.L.Menzel, S.Muller, T.P.Reinhardt, M.Roder, G.Rusev, K.D.Schilling, K.Schmidt, G.Schramm, A.P.Tonchev, W.Tornow, A.Wagner Nuclear Deformation and Neutron Excess as Competing Effects for Dipole Strength in the Pygmy Region NUCLEAR REACTIONS 124,128,132,134Xe(γ, X), E<12 MeV; measured reaction products, Eγ, Iγ. 124,128,132,134Xe; deduced photoabsorption σ, summed B(E1) strength, nuclear deformation in the region of the pygmy dipole resonance. Nuclear resonance fluorescence experiment, random-phase approximation calculations, comparison with available data.
doi: 10.1103/PhysRevLett.112.072501
2014MA90 Phys.Rev. C 90, 054310 (2014) R.Massarczyk, G.Rusev, R.Schwengner, F.Donau, C.Bhatia, M.E.Gooden, J.H.Kelley, A.P.Tonchev, W.Tornow Magnetic dipole strength in 128Xe and 134Xe in the spin-flip resonance region NUCLEAR REACTIONS 128,134Xe(polarized γ, γ'), E=6.0-9.6 MeV; measured Eγ, Iγ, γ(pol, θ) using HIγS facility at TUNL. 128,134Xe; deduced branching ratios and comparison with γ-ray cascade simulations, photoabsorption σ(E) for M1 and E1 transitions, B(M1), B(E1). Comparison of σ(E) with previous experimental results, predictions of phenomenological expressions, RIPL3 recommendations, triple-Lorentzian (TLO) model for E1 and the triple-Gaussian for M1, and QRPA calculations.
doi: 10.1103/PhysRevC.90.054310
2014SA20 Phys.Rev. C 89, 035803 (2014) A.Sauerwein, K.Sonnabend, M.Fritzsche, J.Glorius, E.Kwan, N.Pietralla, C.Romig, G.Rusev, D.Savran, L.Schnorrenberger, A.P.Tonchev, W.Tornow, H.R.Weller Determination of the 142Ce(γ, n) cross section using quasi-monoenergetic Compton backscattered γ rays NUCLEAR REACTIONS 142Ce(polarized γ, n), E=7.6=9.7 MeV; measured Eγ, Iγ, σ(E) at HIγS-TUNL facility. Activation method. Comparison with Hauser-Feshbach calculations using different γ-ray strength functions, and with predictions of Hartree-Fock-BCS model. Relevance to s-process branching at 141Ce, and elemental abundance.
doi: 10.1103/PhysRevC.89.035803
2013BH03 Phys.Rev. C 87, 031601 (2013) C.Bhatia, M.E.Gooden, W.Tornow, A.P.Tonchev Ground-state and isomeric-state cross sections for 181Ta(n, 2n)180Ta between 8 and 15 MeV NUCLEAR REACTIONS 181Ta(n, 2n)180Ta, E=8-15 MeV; measured Eγ, Iγ, σ(E) at TUNL facility. Comparison with previous experimental results, and with evaluated libraries ENSDF VII.1 and TENDL 2011.
doi: 10.1103/PhysRevC.87.031601
2013GO19 Phys.Rev. C 88, 064308 (2013) P.M.Goddard, N.Cooper, V.Werner, G.Rusev, P.D.Stevenson, A.Rios, C.Bernards, A.Chakraborty, B.P.Crider, J.Glorius, R.S.Ilieva, J.H.Kelley, E.Kwan, E.E.Peters, N.Pietralla, R.Raut, C.Romig, D.Savran, L.Schnorrenberger, M.K.Smith, K.Sonnabend, A.P.Tonchev, W.Tornow, S.W.Yates Dipole response of 76Se above 4 MeV NUCLEAR REACTIONS 76Se(polarized γ, γ'), E=4-9 MeV; measured Eγ, Iγ, γ(θ), integrated σ, γ(linear polarization) at HIγS facility at TUNL. 76Se; deduced levels, J, π, Γ, level half-lives, B(E1), B(M1), branching ratios. Comparison with theoretical calculations.
doi: 10.1103/PhysRevC.88.064308
2013IS14 Phys.Lett. B 727, 361 (2013) J.Isaak, D.Savran, M.Krticka, M.W.Ahmed, J.Beller, E.Fiori, J.Glorius, J.H.Kelley, B.Loher, N.Pietralla, C.Romig, G.Rusev, M.Scheck, L.Schnorrenberger, J.Silva, K.Sonnabend, A.P.Tonchev, W.Tornow, H.R.Weller, M.Zweidinger Constraining nuclear photon strength functions by the decay properties of photo-excited states NUCLEAR REACTIONS 11B, 130Te(γ, γ'), (γ, X), E<10 MeV; measured reaction products, Eγ, Iγ; deduced excited states π quantum numbers within 5.5-8.5 MeV region, γ-ray branching ratio, population intensity. Comparison with DICEBOX simulations, DHIPS and HIγS facilities at Darmstadt and TUNL, respectively.
doi: 10.1016/j.physletb.2013.10.040
2013RA23 Phys.Rev.Lett. 111, 112501 (2013) R.Raut, A.P.Tonchev, G.Rusev, W.Tornow, C.Iliadis, M.Lugaro, J.Buntain, S.Goriely, J.H.Kelley, R.Schwengner, A.Banu, N.Tsoneva Cross-Section Measurements of the 86Kr(γ, n) Reaction to Probe the s-Process Branching at 85Kr NUCLEAR REACTIONS 86Kr, 197Au(γ, n), E<9.86-13 MeV; measured reaction products, Eγ, Iγ; deduced σ for direct and inverse reactions, 82,86Kr isotopic ratios. Comparison with HFB+QRPA calculations, TALYS code.
doi: 10.1103/PhysRevLett.111.112501
2013RO28 Phys.Rev. C 88, 044331 (2013) C.Romig, J.Beller, J.Glorius, J.Isaak, J.H.Kelley, E.Kwan, N.Pietralla, V.Yu.Ponomarev, A.Sauerwein, D.Savran, M.Scheck, L.Schnorrenberger, K.Sonnabend, A.P.Tonchev, W.Tornow, H.R.Weller, A.Zilges, M.Zweidinger Low-lying dipole strength of the open-shell nucleus 94Mo NUCLEAR REACTIONS 94Mo(γ, γ'), (polarized γ, γ'), E=5.47, 6.05, 6.44, 6.61, 6.89, 7.65, 8.70 MeV; measured Eγ, Iγ, γγ(θ), γ-polarization asymmetry using DHIPS setup at S-DALINAC, and HiγS at TUNL and DFELL facilities. 94Mo; deduced levels, J, π, Γ20/Γ, branching ratios, B(E1), B(M1), E1 strength distributions, feeding of first 2+ level, elastic σ. Comparison with QPM calculations, and statistical model using DICEBOX computer code.
doi: 10.1103/PhysRevC.88.044331
2013RU01 Phys.Rev.Lett. 110, 022503 (2013) G.Rusev, N.Tsoneva, F.Donau, S.Frauendorf, R.Schwengner, A.P.Tonchev, A.S.Adekola, S.L.Hammond, J.H.Kelley, E.Kwan, H.Lenske, W.Tornow, A.Wagner Fine Structure of the Giant M1 Resonance in 90Zr NUCLEAR REACTIONS 90Zr(γ, γ'), E=7-11 MeV; measured reaction products, Eγ, Iγ; deduced dipole excitations, 1+ states, fine structure of the giant M1 resonance, B(M1). Comparison with three-phonon QPM calculations.
doi: 10.1103/PhysRevLett.110.022503
2013SC08 Phys.Rev. C 87, 051304 (2013) M.Scheck, V.Yu.Ponomarev, T.Aumann, J.Beller, M.Fritzsche, J.Isaak, J.H.Kelley, E.Kwan, N.Pietralla, R.Raut, C.Romig, G.Rusev, D.Savran, K.Sonnabend, A.P.Tonchev, W.Tornow, H.R.Weller, M.Zweidinger Decay pattern of the pygmy dipole resonance in 60Ni NUCLEAR REACTIONS 60Ni(polarized γ, γ'), E=7.65-9.66 MeV; measured Eγ, Iγ, M1 and E1 strengths at HIγS-TUNL facility. 60Ni; deduced levels, J, π, PDR, branching ratios, number of 1+ and 1- states. Comparison with quasiparticle phonon model (QPM) calculations.
doi: 10.1103/PhysRevC.87.051304
2013SC20 Phys.Rev. C 88, 044304 (2013) M.Scheck, V.Yu.Ponomarev, M.Fritzsche, J.Joubert, T.Aumann, J.Beller, J.Isaak, J.H.Kelley, E.Kwan, N.Pietralla, R.Raut, C.Romig, G.Rusev, D.Savran, L.Schorrenberger, K.Sonnabend, A.P.Tonchev, W.Tornow, H.R.Weller, A.Zilges, M.Zweidinger Photoresponse of 60Ni below 10-MeV excitation energy: Evolution of dipole resonances in fp-shell nuclei near N=Z NUCLEAR REACTIONS 60Ni(γ, γ'), (polarized γ, γ'), E<10 MeV; 58Ni(polarized γ, γ'), E<10 MeV; measured Eγ, Iγ, γγ(θ), γ-ray polarization, integrated σ, γ-branching ratios using High-intensity photon setup at S-DALINAC facility. 58,60Ni; deduced levels, J, π, width, level half-lives, B(E1), B(M1), B(E2), E1 and M1 strength distributions. Thomas-Reiche-Kuhn sum rule. Pygmy-dipole resonances. Comparison with QPM calculations.
doi: 10.1103/PhysRevC.88.044304
2013UG01 Phys.Lett. B 719, 74 (2013) C.Ugalde, B.DiGiovine, D.Henderson, R.J.Holt, K.E.Rehm, A.Sonnenschein, A.Robinson, R.Raut, G.Rusev, A.P.Tonchev First determination of an astrophysical cross section with a bubble chamber: The 15N(α, γ)19F reaction NUCLEAR REACTIONS 19F(γ, α), E<2 MeV; measured reaction products, Eα, Iα; deduced inverse reaction σ. R-matrix theory calculations.
doi: 10.1016/j.physletb.2012.12.068
2012HA12 Phys.Rev. C 85, 044302 (2012) S.L.Hammond, A.S.Adekola, C.T.Angell, H.J.Karwowski, E.Kwan, G.Rusev, A.P.Tonchev, W.Tornow, C.R.Howell, J.H.Kelley Dipole response of 238U to polarized photons below the neutron separation energy NUCLEAR REACTIONS 238U(polarized γ, γ'), E=2.0-6.2 MeV; measured Eγ, Iγ, γ(θ), γ(linear pol), integrated cross sections using HIγS facility at TUNL. 238U; deduced levels, J, π, multipolarity, widths, branching ratios, B(M1), B(E1), total γ-ray interaction cross section for E1. Systematics of E1 and M1 strengths for 232Th, 236,238U. Comparison with QRPA calculations.
doi: 10.1103/PhysRevC.85.044302
2012MA31 Phys.Rev. C 86, 014319 (2012) R.Massarczyk, R.Schwengner, F.Donau, E.Litvinova, G.Rusev, R.Beyer, R.Hannaske, A.R.Junghans, M.Kempe, J.H.Kelley, T.Kogler, K.Kosev, E.Kwan, M.Marta, A.Matic, C.Nair, R.Raut, K.D.Schilling, G.Schramm, D.Stach, A.P.Tonchev, W.Tornow, E.Trompler, A.Wagner, D.Yakorev Electromagnetic dipole strength of 136Ba below the neutron separation energy NUCLEAR REACTIONS 136Ba(γ, γ'), E at 7.0 MeV/c and 11.4 MeV/c; 136Ba(polarized γ, γ')E=4.7, 5.1, 5.6, 6.1, 6.5, 7.0, 7.5, 8.0, 8.4, 8.7, 9.0, 9.3 MeV; measured Eγ, Iγ, integrated σ(E), photoabsorption σ as a function of excitation energy, γ(θ), γ(lin pol) using Bremsstrahlung facility at ELBE, HZDR, and HIγS facility at TUNL. 136Ba; deduced levels, J, π, widths, pygmy dipole resonances, dipole strength in the quasicontinuum, enhancement of dipole strength. Statistical code used to simulate inelastic transitions and to determine the branching ratios of transitions to ground state. GEANT4 simulations. Comparison with previous experimental studies, and with theoretical calculations using quasiparticle random-phase approximation (QRPA) and relativistic quasiparticle time blocking approximation (RQTBA) approaches. Comparison of photoabsorption σ in 136,138Ba and 139La targets.
doi: 10.1103/PhysRevC.86.014319
2012RA05 Phys.Rev.Lett. 108, 042502 (2012) R.Raut, W.Tornow, M.W.Ahmed, A.S.Crowell, J.H.Kelley, G.Rusev, S.C.Stave, A.P.Tonchev Photodisintegration Cross Section of the Reaction 4He(γ, p)3H between 22 and 30 MeV NUCLEAR REACTIONS 4He(γ, p), E=22-30 MeV; measured reaction products; deduced σ and its uncertainties. Comparison with theoretical calculations.
doi: 10.1103/PhysRevLett.108.042502
2012RA21 J.Phys.:Conf.Ser. 337, 012048 (2012) R.Raut, A.Banu, C.Iliadis, J.H.Kelley, G.Rusev, R.Schwengner, A.P.Tonchev, W.Tornow Cross-Section Measurements of the 86Kr(γ, n) Reaction to Probe the s-Process Branching at 85Kr NUCLEAR REACTIONS 86Kr(γ, n), E=9.970, 10.115, 10.170, 10.290, 10.360, 10.490, 11.005 MeV; measured En, In using 3He proportional counters; deduced σ; calculated σ using TALYS code with different parameter sets.
doi: 10.1088/1742-6596/337/1/012048
2012TO08 Phys.Rev. C 85, 061001 (2012) W.Tornow, J.H.Kelley, R.Raut, G.Rusev, A.P.Tonchev, M.W.Ahmed, A.S.Crowell, S.C.Stave Photodisintegration cross section of the reaction 4He(γ, n)3He at the giant dipole resonance peak NUCLEAR REACTIONS 4He(γ, n)3He, E=27.0, 27.5, 28.0 MeV; measured Eγ, Iγ, angle-integrated σ at GDR peak. Duke University electron storage ring facility. Comparison with previous experimental data, and with theoretical predictions by Trento group based on semirealistic central nucleon-nucleon (NN) potential of the MT I-III type.
doi: 10.1103/PhysRevC.85.061001
2011IS01 Phys.Rev. C 83, 034304 (2011) J.Isaak, D.Savran, M.Fritzsche, D.Galaviz, T.Hartmann, S.Kamerdzhiev, J.H.Kelley, E.Kwan, N.Pietralla, C.Romig, G.Rusev, K.Sonnabend, A.P.Tonchev, W.Tornow, A.Zilges Investigation of low-lying electric dipole strength in the semimagic nucleus 44Ca NUCLEAR REACTIONS 44Ca(polarized γ, γ'), E = 6-10, 9.9 MeV; measured Eγ, Iγ, γ(θ), integrated cross sections, and polarization asymmetry at DHIPS facility using S-DALINAC accelerator, and at HIγS facility. 44Ca; deduced levels, J, π, photon branching ratios, widths, B(E1) and B(M1) transition strengths. Comparisons with dipole strengths in 40,48Ca and with microscopic calculations within the extended theory of finite Fermi systems. Dependence of total E1 strength on neutron number.
doi: 10.1103/PhysRevC.83.034304
2011KW01 Phys.Rev. C 83, 041601 (2011) E.Kwan, G.Rusev, A.S.Adekola, F.Donau, S.L.Hammond, C.R.Howell, H.J.Karwowski, J.H.Kelley, R.S.Pedroni, R.Raut, A.P.Tonchev, W.Tornow Discrete deexcitations in 235U below 3 MeV from nuclear resonance fluorescence NUCLEAR REACTIONS 235U(γ, γ'), E=1.6-3.0 MeV; measured Eγ, Iγ, γγ-coin, integrated cross sections, and widths using HIγS facility. 235U; deduced levels, J, π, branching ratios. Comparison with quasiparticle random-phase approximation in deformed basis for dipole transitions.
doi: 10.1103/PhysRevC.83.041601
2011RA08 Phys.Rev. C 83, 044621 (2011) 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, J.B.Wilhelmy Cross-section measurements of neutron-induced reactions on GaAs using monoenergetic beams from 7.5 to 15 MeV NUCLEAR REACTIONS 69Ga(n, 2n)68Ga, 69Ga(n, p)69mZn, 71Ga(n, p)71mZn, 75As(n, 2n)74As, 75As(n, p)75Ge, E=7.5, 8.0, 8.5, 9.5, 10.2, 11.0, 11.5, 12.5, 13.25, 14.0, 14.5, 15.0 MeV; measured Eγ, Iγ; deduced half-lives and σ. 27Al(n, α)24Na, 197Au(n, 2n)196Au, E=7.5-14.5 MeV; measured σ and used as monitor reactions. Comparison of measured cross sections with previous data and statistical model calculations based on the Hauser-Feshbach formalism, using the TALYS and the COH3 codes.
doi: 10.1103/PhysRevC.83.044621
2011RU15 J.Phys.:Conf.Ser. 312, 092053 (2011) G.Rusev, A.S.Adekola, F.Donau, S.Frauendorf, S.L.Hammond, C.Huibregtse, J.H.Kelley, E.Kwan, R.Schwengner, A.P.Tonchev, W.Tornow, A.Wagner Fine structure of the giant M1 resonance in 90Zr NUCLEAR REACTIONS 90Zr(polarized γ, γ'), E=7-11 MeV; measured Eγ, Iγ(θ) using HPGe; deduced B(M1) fine structure; calculated B(M1) fine structure using shell model and QRPA.
doi: 10.1088/1742-6596/312/9/092053
2011TO06 Phys.Lett. B 702, 121 (2011) 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.Skibinski, H.Witala, R.Schiavilla Two-body photodisintegration of 3He between 7 and 16 MeV NUCLEAR REACTIONS 3He(γ, p), E=7-16 MeV; measured reaction products, Ep, Ip; deduced σ. Comparison with theoretical calculations and experimental data.
doi: 10.1016/j.physletb.2011.06.080
2011TO17 J.Phys.:Conf.Ser. 312, 092058 (2011) A.P.Tonchev, S.L.Hammond, J.H.Kelley, E.Kwan, H.Lenske, R.Raut, G.Rusev, W.Tornow, N.Tsoneva Coarse and Fine Structure of the Pygmy Dipole Resonance NUCLEAR REACTIONS 138Ba(polarized γ, γ), (polarized γ, γ'), E=5.4, 7.2, 8.5 MeV; measured Eγ, Iγ(θ) using HPGe with nuclear resonance fluorescence; deduced σ, M1, E1 asymmetry, GDR, PDR photoabsorption σ, E1 ground-state γ transition strength, resonant-shape; calculated E1, M1 γ transition strength distribution using QPM.
doi: 10.1088/1742-6596/312/9/092058
2010DE29 Phys.Rev. C 82, 025802 (2010) R.J.de Boer, M.Wiescher, J.Gorres, R.Longland, C.Iliadis, G.Rusev, A.P.Tonchev Photoexcitation of astrophysically important states in 26Mg. II. Ground-state-transition partial widths NUCLEAR REACTIONS 26Mg(γ, γ'), E=10.5-11.7 MeV; measured Eγ, Iγ; deduced levels, J, π, resonances, branching ratios, total widths, partial widths. GEANT4 Monte-Carlo simulation of γ-ray spectra. Relevance to predictions of neutron production for the s-process in nucleosynthesis.
doi: 10.1103/PhysRevC.82.025802
2010PI13 J.Phys.:Conf.Ser. 205, 012036 (2010) N.Pietralla, T.C.Li, M.Fritzsche, M.W.Ahmed, D.Savran, A.P.Tonchev, W.Tornow, H.R.Weller, V.Werner Spin and parity assignments to dipole excitations of the odd-mass nucleus 207Pb from nuclear resonance fluorescence experiments with linearly-polarized γ-ray beams NUCLEAR REACTIONS Pb(polarized γ, γ'), E=5400-5700 keV; measured Eγ, Iγ(θ) using HIγS at DFELL. 206,207,208Pb deduced low-lying dipole-excited levels, J, π, E1 γ decay rate.
doi: 10.1088/1742-6596/205/1/012036
2010TO01 Phys.Rev.Lett. 104, 072501 (2010) A.P.Tonchev, S.L.Hammond, J.H.Kelley, E.Kwan, H.Lenske, G.Rusev, W.Tornow, N.Tsoneva Spectral Structure of the Pygmy Dipole Resonance NUCLEAR REACTIONS 138Ba(γ, γ), (γ, γ'), E ≈ below one-neutron separation energy; measured Eγ, Iγ; deduced σ, energy levels, B(E1), B(M1). Comparison with QPM calculations.
doi: 10.1103/PhysRevLett.104.072501
2010TO09 Phys.Rev. C 82, 054620 (2010) A.P.Tonchev, S.L.Hammond, C.R.Howell, C.Huibregtse, A.Hutcheson, J.H.Kelley, E.Kwan, R.Raut, G.Rusev, W.Tornow, T.Kawano, D.J.Vieira, J.B.Wilhelmy Measurement of the 241Am(γ, n)240Am reaction in the giant dipole resonance region NUCLEAR REACTIONS 241Am(γ, n), E=9.0-15.6 MeV; measured Eγ, Iγ, σ using HIγS facility. Giant dipole resonance region. Comparison with previous measurements and statistical nuclear-model calculations.
doi: 10.1103/PhysRevC.82.054620
2009CH04 Ann.Nucl.Energy 36, 258 (2009) M.B.Chadwick, R.C.Little, T.Kawano, P.Talou, D.Viera, M.Jandel, T.A.Bredeweg, M.C.White, A.P.Tonchev, J.A.Becker Actinide ENDF/B-VII cross-section evaluations and validation testing NUCLEAR REACTIONS 241Am(n, γ), E < 1000 MeV; 241Am(n, 2n), E < 20 MeV; analyzed cross sections. 239Pu(n, X), E=1.0 MeV; 238U(n, γ), E < 1.0 MeV; calculated cross sections.
doi: 10.1016/j.anucene.2008.11.011
2009HU09 Phys.Rev. C 80, 014603 (2009) A.Hutcheson, C.Angell, J.A.Becker, A.S.Crowell, D.Dashdorj, B.Fallin, N.Fotiades, C.R.Howell, H.J.Karwowski, T.Kawano, J.H.Kelley, E.Kwan, R.A.Macri, R.O.Nelson, R.S.Pedroni, A.P.Tonchev, W.Tornow Cross sections for 238U(n, n'γ) and 238U(n, 2nγ) reactions at incident neutron energies between 5 and 14 MeV NUCLEAR REACTIONS 238U(n, n'γ), (n, 2nγ), E=5-14 MeV; measured Eγ, yields, σ and excitation functions. Comparison with existing data and calculations using the GNASH and TALYS Hauser-Feshbach statistical-model codes.
doi: 10.1103/PhysRevC.80.014603
2009LO06 Phys.Rev. C 80, 055803 (2009) R.Longland, C.Iliadis, G.Rusev, A.P.Tonchev, R.J.de Boer, J.Gorres, M.Wiescher Photoexcitation of astrophysically important states in 26Mg NUCLEAR REACTIONS 26Mg(polarized γ, γ'), E=10.8, 11.0, 11.2, 11.4 MeV; measured Eγ, Iγ, and γγ(θ) at TUNL HIγS facility. 26Mg; deduced levels, J, π, and branching ratios. Comparison with Monte Carlo simulations. Implications for the reaction rates for 22Ne(α, γ)26Mg of astrophysical interest.
doi: 10.1103/PhysRevC.80.055803
2009PI14 Phys.Lett. B 681, 134 (2009) N.Pietralla, T.C.Li, M.Fritzsche, M.W.Ahmed, T.Ahn, A.Costin, J.Enders, J.Li, S.Muller, P.von Neumann-Cosel, I.V.Pinayev, V.Yu.Ponomarev, D.Savran, A.P.Tonchev, W.Tornow, H.R.Weller, V.Werner, Y.K.Wu, A.Zilges Competition between excited core states and 1hω single-particle excitations at comparable energies in 207Pb from photon scattering NUCLEAR REACTIONS 208Pb(polarized γ, γ'), E=5.5, 5.6 MeV; measured Eγ, Iγ using the azimuthal nuclear resonance fluorescence intensity asymmetry technique. 206,207,208Pb; deduced levels, J, π.
doi: 10.1016/j.physletb.2009.09.059
2009RU04 Phys.Rev. C 79, 047601 (2009) G.Rusev, A.P.Tonchev, R.Schwengner, C.Sun, W.Tornow, Y.K.Wu Multipole mixing ratios of transitions in 11B NUCLEAR REACTIONS 11B(polarized γ, γ'), E=1-100 MeV; measured Eγ, Iγ, azimuthal asymmetries; deduced levels, mixing ratios.
doi: 10.1103/PhysRevC.79.047601
2008EL09 Phys.Rev. C 78, 064303 (2008); Erratum Phys.Rev. C 88, 029903 (2013) E.Elhami, J.N.Orce, M.Scheck, S.Mukhopadhyay, S.N.Choudry, M.T.McEllistrem, S.W.Yates, C.Angell, M.Boswell, B.Fallin, C.R.Howell, A.Hutcheson, H.J.Karwowski, J.H.Kelley, Y.Parpottas, A.P.Tonchev, W.Tornow Experimental study of the low-lying structure of 94Zr with the (n, n'γ) reaction NUCLEAR REACTIONS 94Zr(n, n'γ), E=2.5-4.0 MeV; measured Eγ, Iγ, γγ-coin, angular distributions, half-lives by Doppler shift attenuation; deduced levels, J, π, multipolarities, mixing ratios, B(M1), B(E2).90,92,96,98,100,102Zr, 96Ru, 94,96Mo; systematics. Comparison with IBA and shell model calculations.
doi: 10.1103/PhysRevC.78.064303
2008TO06 Phys.Rev. C 77, 054610 (2008) 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.Dashdorj, 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, J.B.Wilhelmy Measurement of the 241Am(n, 2n) reaction cross section from 7.6 MeV to 14.5 MeV NUCLEAR REACTIONS 241Am(n, 2n), E=7.6-14.5 MeV; measured Eγ, Iγ, neutron time-of-flight spectra, σ, excitation functions. Comparison with evaluated data in ENDF/B-VII and JENDL-3.3.
doi: 10.1103/PhysRevC.77.054610
2006LI23 Phys.Rev. C 73, 054306 (2006) T.C.Li, N.Pietralla, A.P.Tonchev, M.W.Ahmed, T.Ahn, C.Angell, M.A.Blackston, A.Costin, K.J.Keeter, J.Li, A.Lisetskiy, S.Mikhailov, Y.Parpottas, B.A.Perdue, G.Rainovski, W.Tornow, H.R.Weller, Y.K.Wu First evidence for spin-flip M1 strength in 40Ar NUCLEAR REACTIONS 40Ar(polarized γ, γ'), E=7.7-11 MeV; measured Eγ, Iγ, asymmetry. 40Ar deduced levels, J, π, excitation B(E1), B(M1), spin-flip M1 strength. Comparison with shell model predictions.
doi: 10.1103/PhysRevC.73.054306
2004FR30 Phys.Rev. C 70, 044317 (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, S.W.Yates Parity assignments to strong dipole excitations of 92Zr and 96Mo NUCLEAR REACTIONS 92Zr(polarized γ, γ'), E=3.47, 3.64 MeV; 96Mo(γ, γ'), E=2.80, 3.30, 3.43, 3.60, 3.90 MeV; measured Eγ, Iγ, azimuthal asymmetry. 92Zr, 96Mo levels deduced π.
doi: 10.1103/PhysRevC.70.044317
2004PE24 Phys.Rev. C 70, 064305 (2004) 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 γ rays by 16O for Eγ = 25-40 MeV NUCLEAR REACTIONS 16O(polarized γ, γ'), E=25-40 MeV; measured polarization asymmetries; deduced resonance features.
doi: 10.1103/PhysRevC.70.064305
2003NE17 Phys.Rev. C 68, 065804 (2003) S.O.Nelson, M.W.Ahmed, B.A.Perdue, K.Sabourov, A.L.Sabourov, A.P.Tonchev, R.M.Prior, M.Spraker, H.R.Weller Analyzing power measurement for the 14N(p(pol), γ)15O reaction at astrophysically relevant energies NUCLEAR REACTIONS 14N(polarized p, γ), E=270 MeV; measured σ(θ), Ay(θ); deduced astrophysical S-factors. Comparison with direct-capture-plus-resonance model predictions.
doi: 10.1103/PhysRevC.68.065804
2003TO21 Phys.Rev. C 68, 045803 (2003) 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(pol), γ)11C reaction at astrophysically relevant energies NUCLEAR REACTIONS 10B(polarized p, γ), E=100, 130, 160 keV; measured Eγ, Iγ, σ(E, θ), Ay(E, θ); deduced astrophysical S-factors, subthreshold resonance. Direct capture model analysis.
doi: 10.1103/PhysRevC.68.045803
2002PI02 Phys.Rev.Lett. 88, 012502 (2002) N.Pietralla, Z.Berant, 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.Sabourov, A.P.Tonchev, H.R.Weller Parity Measurements of Nuclear Levels using a Free-Electron-Laser Generated γ-Ray Beam NUCLEAR REACTIONS 138Ba(polarized γ, γ'), E ≈ 5.62 MeV; measured Eγ, Iγ, azimuthal asymmetries. 138Ba levels deduced π. Nuclear resonance fluorescence, free-electron laser, comparisons with previous results.
doi: 10.1103/PhysRevLett.88.012502
2002PI08 Phys.Rev. C65, 047305 (2002); Erratum Phys.Rev. C65, 069901 (2002) 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.Sabourov, A.P.Tonchev, H.R.Weller Identification of the Jπ = 1- Two-Phonon State of 88Sr NUCLEAR REACTIONS 88Sr(polarized γ, γ'), E=4.74, 5.02, 7.54 MeV; measured Eγ, Iγ, azimuthal asymmetry. 88Sr level deduced J, π.
doi: 10.1103/PhysRevC.65.047305
2001GA57 Bull.Rus.Acad.Sci.Phys. 65, 121 (2001) Yu.P.Gangrsky, P.Zuzaan, N.N.Kolesnikov, V.G.Lukashek, A.P.Tonchev Isomeric Ratios in Crossing (nγ) and (γn) Reactions NUCLEAR REACTIONS 74Ge, 80Se, 84Sr, 108Pd, 114Cd, 112,122Sn, 120,126,128Te, 130,132Ba, 136,138Ce, 196Pt, 196Hg(n, γ), E=thermal; 76Ge, 82Se, 86Sr, 110Pd, 116Cd, 114,124Sn, 122,128,130Te, 132,134Ba, 138,140Ce, 198Pt, 198Hg(γ, n), E=25 MeV bremsstrahlung; measured isomeric cross section ratios. Comparison with statistical model calculations. Data from this article have been entered in the EXFOR database. For more information, access X4 dataset41414. 2000TO02 Appl.Radiat.Isot. 52, 873 (2000) Excitation of the 180mTa Isomer in (γ, n) Reactions and Its Astrophysical Relevance NUCLEAR REACTIONS 181Ta(γ, n), E=7-13 MeV bremsstralung; measured ground-state yield; deduced isomer production σ. 197Au(γ, n), E=7-13 MeV bremsstralung; measured ground-state yield. Activation technique.
doi: 10.1016/S0969-8043(99)00132-3
2000TS01 Phys.Rev. C61, 044303 (2000) N.Tsoneva, Ch.Stoyanov, Yu.P.Gangrsky, V.Yu.Ponomarev, N.P.Balabanov, A.P.Tonchev Population of Isomers in the Decay of the Giant Dipole Resonance NUCLEAR REACTIONS 138Ba, 140Ce, 142Nd, 144Sm(γ, n), E=10-26 MeV bremsstrahlung; measured σ, isomeric ratios. Comparison with quasiparticle-phonon model calculations.
doi: 10.1103/PhysRevC.61.044303
1999GA45 Yad.Fiz. 62, No 10, 1733 (1999); Phys.Atomic Nuclei 62, 1615 (1999) Yu.P.Gangrsky, P.Zuzaan, N.N.Kolesnikov, V.G.Lukashek, A.P.Tonchev Isomeric Ratios in (γ, p) Reactions at Giant-Dipole-Resonance Energies NUCLEAR REACTIONS 98Mo, 100Ru, 118,120,122Sn(γ, p), E=19-24 MeV bremsstrahlung; measured yields, isomeric ratios. Activation technique, comparison with statistical model calculations. Data from this article have been entered in the EXFOR database. For more information, access X4 datasetM0616. 1999TO05 Nucl.Instrum.Methods Phys.Res. A422, 532 (1999) A.P.Tonchev, Yu.P.Gangrsky, A.G.Belov New Candidates for High Spin Isomeric Targets NUCLEAR REACTIONS 180mTa(γ, γ')180Ta, 180Hf(γ, γ')180mHf, E=6.5, 7.0 MeV bremsstrahlung; measured integral σ. Ag, Ho(n, γ)108mAg/166mHo, E=reactor; measured Eγ, Iγ. Production of isomeric targets using neutron-induced reactions discussed. NUCLEAR STRUCTURE 108Ag, 166Ho, 178Hf, 180Ta, 186Re, 242Am; compiled, evaluated candidates for high-spin isomeric targets.
doi: 10.1016/S0168-9002(98)01080-8
1998TO24 Phys.Rev. C58, 2851 (1998) A.P.Tonchev, Yu.P.Gangrsky, A.G.Belov, V.E.Zhuchko Deformation on Isomeric Excitation of Eu Isotopes in (γ, n) and (n, γ) Reactions NUCLEAR REACTIONS 151,153Eu(n, γ), E=thermal; 151,153Eu(γ, n), E=12-22 MeV; measured yields, isomeric ratios; deduced deformation effect. Activation technique.
doi: 10.1103/PhysRevC.58.2851
1997BE58 Bull.Rus.Acad.Sci.Phys. 61, 312 (1997) A.G.Belov, Yu.P.Gangrsky, P.Zuzaan, A.P.Tonchev Excitation of High-Spin 180Hf Isomer and De-Excitation of High-Spin 180Ta Isomer in Inelastic Scattering of γ-Quanta NUCLEAR REACTIONS, ICPND 180Hf, 180mTa(γ, γ'), E=6-8 MeV bremsstrahlung; measured isomer production σ(E). 180Hf, 180Ta deduced isomer excitation, de-excitation mechanisms. Activation technique. Data from this article have been entered in the EXFOR database. For more information, access X4 datasetM0857. 1997BE67 Yad.Fiz. 60, No 11, 1940 (1997); Phys.Atomic Nuclei 60, 1773 (1997) A.G.Belov, Yu.P.Gangrsky, V.E.Zhuchko, A.P.Tonchev Excitation of Isomeric States in (γ, n) and (n, γ) Reactions on Eu Isotopes NUCLEAR REACTIONS 151,153Eu(n, γ), E=thermal; 151,153Eu(γ, n), E=13-22 MeV bremsstrahlung; measured Eγ, Iγ, yields, isomeric ratios; deduced deformation effects. Activation technique.
1997BE76 Hyperfine Interactions 107, 167 (1997) A.G.Belov, Yu.P.Gangrsky, A.P.Tonchev, P.Zuzaan Excitation of the High-Spin 180Hf Isomer and De-Excitation of the 180Ta Isomer in (γ, γ') Reactions NUCLEAR REACTIONS 180Hf, 180Ta(γ, γ')180mHf/180Ta, E=6-8 MeV bremsstrahlung; measured yields; deduced σ, isomer excitation mechanism.
doi: 10.1023/A:1012011923772
1996BE30 Yad.Fiz. 59, No 3, 389 (1996); Phys.Atomic Nuclei 59, 367 (1996) A.G.Belov, Yu.P.Gangrsky, A.P.Tonchev, N.P.Balabanov, Kh.G.Khristov Measurement of Isomeric Ratios in the Reactions (γ, n) on Barium Isotopes in the Giant-Dipole-Resonance Region NUCLEAR REACTIONS, ICPND Ba(γ, n), E=1.8 MeV bremsstrahlung; measured Eγ, Iγ; deduced 137m,135m,133m,131m,129mBa yield, isomeric ratios. 130,132,134,136,138Ba deduced GDR excitation σ, resonance parameters. Data from this article have been entered in the EXFOR database. For more information, access X4 datasetM0674. 1996BE32 Yad.Fiz. 59, No 4, 585 (1996); Phys.Atomic Nuclei 59, 553 (1996) A.G.Belov, Yu.P.Gangrsky, A.P.Tonchev, N.P.Balabanov Excitation of Isomeric 1h11/2 States in the Reactions (γ, n) NUCLEAR REACTIONS, ICPND 108,110Pd, 116Cd, 118Sn, 120,122,124,130Te, 134,136,138Ba, 138,140Ce, 142Nd, 144Sm(γ, n), E ≤ 25 MeV bremsstrahlung; measured σ, isomer production σ, ratio; deduced nucleon number, excitation energy dependences. Data from this article have been entered in the EXFOR database. For more information, access X4 datasetM0527. 1996GA43 Fiz.Elem.Chastits At.Yadra 27, 1043 (1996); Phys.Part.Nucl. 27, 428 (1996) Yu.P.Gangrsky, A.P.Tonchev, N.P.Balabanov Excitation of Isomeric States in Photonuclear Reactions NUCLEAR REACTIONS 77Se, 79Br, 87Sr, 113,115In, 176Lu, 191Ir, 197Au, 180Hf, 190Os, 204Pb(γ, γ'), E<15 MeV; 108,110Pd, 116Cd, 118,124Sn, 120,122,124,130Te, 136Xe, 130,132,134,136,138Ba, 138,140Ce, 142Nd, 144Sm, 74Se, 86,88Sr, 90Zr, 92Mo, 198Pt, 196,198Hg, 208Pb(γ, n), E<30 MeV; analyzed isomer excitation σ; deduced isomer population mechanism features.
1991AN07 Yad.Fiz. 53, 14 (1991); Sov.J.Nucl.Phys. 53, 9 (1991) A.D.Antonov, N.P.Balabanov, Yu.P.Gangrsky, F.G.Kondev, S.G.Marinova, A.P.Tonchev, Kh.G.Khristov, V.D.Cholakov Measurement of the Integrated Cross Sections for the (γ, α) Reaction in the Region of the Giant Dipole Resonance NUCLEAR REACTIONS, ICPND 51V, 65Cu, 71Ga, 76Ge, 96Zr, 93Nb, 92Mo, 115In, 143,145Nd, 170Er, 181Ta, 207Pb(γ, α), E=23 MeV bremsstrahlung; measured yields, σ. Activation method, statistical model analysis. Data from this article have been entered in the EXFOR database. For more information, access X4 datasetM0893. 1991AN22 Izv.Akad.Nauk SSSR, Ser.Fiz. 55, 2260 (1991); Bull.Acad.Sci.USSR, Phys.Ser. 55, No.11, 176 (1991) A.D.Antonov, N.P.Balabanov, Yu.P.Gangrsky, F.G.Kondev, S.G.Marinova, A.P.Tonchev, Kh.G.Khristov Excitation Function of the Reaction (γα) in the Region of a Giant Dipole Resonance NUCLEAR REACTIONS, ICPND 51V, 65Cu, 76Ge, 96Zr, 93Nb, 170Er(γ, α), E=16-25 MeV bremsstrahlung; measured σ(E), γ yields. Statistical model analysis including isospin. Data from this article have been entered in the EXFOR database. For more information, access X4 datasetM0894. 1991TO10 J.Radioanal.Nucl.Chem. 155, 299 (1991) A.P.Tonchev, F.G.Kondev, Kh.G.Khristov, Yu.P.Gangrsky, N.P.Balabanov, V.D.Tcholakov Isomeric Yield Ratio of 134I in Photofission of 232Th and 238U NUCLEAR REACTIONS, ICPND 232Th, 238U(γ, F)134I, E=25 MeV bremsstrahlung; measured fission product isomeric yield ratios. Radiochemical techniques, γ-spectrometry.
doi: 10.1007/BF02163877
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