NSR Query Results
Output year order : Descending NSR database version of March 21, 2024. Search: Author = J.Niskanen Found 73 matches. 2020NI03 Phys.Rev. C 102, 024002 (2020) Centrifugal effects in NΔ states
doi: 10.1103/PhysRevC.102.024002
2017NI08 Phys.Rev. C 95, 054002 (2017) Width of NΔ and ΔΔ states
doi: 10.1103/PhysRevC.95.054002
2015NI13 Phys.Rev. C 92, 055205 (2015) η-nuclear interaction: Optical model versus coupled-channels approach NUCLEAR REACTIONS 3He, 12C(η, η), E=low energy; calculated scattering lengths using optical model and coupled-channel approach to study the effect of pionic inelasticity.
doi: 10.1103/PhysRevC.92.055205
2013MA28 Nucl.Phys. A901, 65 (2013) H.Machner, J.Haidenbauer, F.Hinterberger, A.Magiera, J.A.Niskanen, J.Ritman, R.Siudak Study of the Λp interaction close to the Σ+ and Σ0p thresholds NUCLEAR REACTIONS 1H(Λ, Λ), (Λ, Σ+), (Λ, Σ0), E at 400-1000 MeV/c;1H(p, Λ)pK+, (p, Σ+)nK+, (p, Σ+)pΣ0, E at ≈ 3 GeV/c;2H(K-, π-)pΛ, E at 0.76 GeV/c; calculated, analyzed missing mass, σ(θ); deduced hyperon-nucleon interaction details, resonance effects.
doi: 10.1016/j.nuclphysa.2013.01.031
2013NI08 Nucl.Phys. A902, 40 (2013) Binding vs. scattering length: η in light nuclei NUCLEAR STRUCTURE 4He, 12C, 24Mg mesic nuclei; calculated scattering length vs s-state η-mesic nuclei binding energy.
doi: 10.1016/j.nuclphysa.2013.02.009
2012PA31 Eur.Phys.J. A 48, 119 (2012) T.M.Partanen, J.A.Niskanen, M.J.Iqbal Parity nonconserving proton-proton elastic scattering NUCLEAR REACTIONS 1H(p, p), E=1-350 MeV; calculated longitudinal analyzing power using DDH potential with short-range ρ and ω and longer-ranged 2π exchanges as parity nonconserving interactions.
doi: 10.1140/epja/i2012-12119-1
2011PA19 Eur.Phys.J. A 47, 53 (2011) Parity nonconservation in deuteron photoreactions NUCLEAR REACTIONS 2H(polarized γ, n), E=threshold-10 MeV; 1H(polarized n, γ), E=thermal-10 MeV;calculated σ with E1, M1 components, parity nonconserving components, asymmetry. Leading-order electromagnetic Hamiltonian with different interactions and Δ isobar excitations using coupled channels.
doi: 10.1140/epja/i2011-11053-0
2009BU08 Phys.Rev. C 79, 061001 (2009) A.Budzanowski, A.Chatterjee, P.Hawranek, F.Hinterberger, R.Jahn, V.Jha, K.Kilian, Da.Kirillov, Di.Kirillov, S.Kliczewski, D.Kolev, M.Kravcikova, M.Lesiak, J.Lieb, H.Machner, A.Magiera, R.Maier, G.Martinska, S.Nedev, J.A.Niskanen, N.Piskunov, D.Protic, J.Ritman, P.von Rossen, B.J.Roy, I.Sitnik, R.Siudak, H.J.Stein, R.Tsenov, J.Urban, G.Vankova, C.Wilkin, and the COSY-GEM Collaboration Precision measurements of the pp → π+pn and pp → π+d reactions: Importance of long-range and tensor force effects NUCLEAR REACTIONS p(p, X), (p, π+)d, (p, π+)pn, E=401, 601, 951 MeV; measured forward differential cross sections for pion production; deduced normalization factor for the deuteron- and pn-outgoing channels using the Faldt-Wilkin theorem.
doi: 10.1103/PhysRevC.79.061001
2008NI08 Eur.Phys.J. A 36, 295 (2008) J.A.Niskanen, T.M.Partanen, M.J.Iqbal Parity nonconserving two-pion exchange in elastic proton-proton scattering NUCLEAR REACTIONS 1H(polarized p, p), E=10-1000 MeV; calculated analyzing power using various models. Comparison with data.
doi: 10.1140/epja/i2007-10595-x
2006MA56 Nucl.Phys. A776, 172 (2006) Charge independence studied in NN → dπ reactions NUCLEAR REACTIONS 1H(p, π+), (n, π0), E ≈ threshold; analyzed σ(θ), σ, anisotropies; deduced parameters, charge independence features.
doi: 10.1016/j.nuclphysa.2006.07.034
2006NI15 Phys.Lett. B 642, 34 (2006) Predictions of striking energy and angular dependence in pp → (pp)s-waveπ0 production NUCLEAR REACTIONS 1H(p, pπ0), E=300-900 MeV; calculated σ, σ(θ). Comparison with COSY data.
doi: 10.1016/j.physletb.2006.06.083
2006NO08 Phys.Lett. B 639, 465 (2006) A.Nogga, A.C.Fonseca, A.Gardestig, C.Hanhart, C.J.Horowitz, G.A.Miller, J.A.Niskanen, U.van Kolck Realistic few-body physics in the dd → απ0 NUCLEAR REACTIONS 2H(d, π0), E=293 MeV; calculated σ, related matrix elements. Effective field theory with four-body theory.
doi: 10.1016/j.physletb.2006.04.058
2005AB01 Phys.Lett. B 610, 31 (2005) M.Abdel-Bary, A.Budzanowski, A.Chatterjee, J.Ernst, P.Hawranek, F.Hinterberger, V.Jha, K.Kilian, S.Kliczewski, D.Kirillov, D.Kolev, M.Kravcikova, T.Kutsarova, M.Lesiak, J.Lieb, H.Machner, A.Magiera, R.Maier, G.Martinska, S.Nedev, J.Niskanen, N.Piskunov, D.Prasuhn, D.Protic, P.von Rossen, B.J.Roy, I.Sitnik, R.Siudak, M.Smiechowicz, R.Tsenov, M.Ulicny, J.Urban, G.Vankova, C.Wilkin, and the GEM Collaboration Detailed comparison of the pp → π+ pn and pp → π+d reactions at 951 MeV NUCLEAR REACTIONS 1H(p, pπ+), (p, π+), E=951 MeV; measured missing mass spectra, σ; deduced D-state effects.
doi: 10.1016/j.physletb.2005.01.100
2004GA22 Phys.Rev. C 69, 044606 (2004) A.Gardestig, C.J.Horowitz, A.Nogga, A.C.Fonseca, C.Hanhart, G.A.Miller, J.A.Niskanen, U.van Kolck Survey of charge symmetry breaking operators for dd → απ0 NUCLEAR REACTIONS 2H(d, π0), E=228.5, 231.8 MeV; calculated pion production total σ, charge symmetry breaking amplitudes; deduced reaction mechanism features. Effective field theory approach.
doi: 10.1103/PhysRevC.69.044606
2004SI30 Phys.Rev. C 70, 047001 (2004) A.Sibirtsev, J.Haidenbauer, J.A.Niskanen, U.-G.Meissner Bounds on the bound η-3He system ATOMIC PHYSICS, Mesic-atoms 3He; analyzed η-3He scattering length, related data; deduced limits on bound state energy, width.
doi: 10.1103/PhysRevC.70.047001
2004SI32 Eur.Phys.J. A 22, 495 (2004) A.Sibirtsev, J.Haidenbauer, C.Hanhart, J.A.Niskanen The ηHe scattering length revisited NUCLEAR REACTIONS 2H(p, X)3He, E ≈ threshold; analyzed η-meson production data; deduced η3He scattering length.
doi: 10.1140/epja/i2003-10239-3
2003BA17 Eur.Phys.J. A 16, 437 (2003) V.Baru, J.Haidenbauer, C.Hanhart, J.A.Niskanen New parameterization of the trinucleon wave function and its application to the π 3He scattering length NUCLEAR STRUCTURE A=3; calculated wave functions. Separable parameterization. NUCLEAR REACTIONS 3He(π, X), E not given; calculated scattering length.
doi: 10.1140/epja/i2002-10119-4
2003BA80 Phys.Rev. C 68, 035203 (2003) V.Baru, J.Haidenbauer, C.Hanhart, J.A.Niskanen Charge symmetry breaking as a probe for the real part of η-nucleus scattering lengths NUCLEAR REACTIONS 2H(p, π+), (p, π0), E at 1530-1590 MeV/c; calculated σ ratio, charge-symmetry breaking effects; deduced η-nucleus scattering lengths.
doi: 10.1103/PhysRevC.68.035203
2003OP01 Phys.Rev.Lett. 91, 212302 (2003) A.K.Opper, E.Korkmaz, D.A.Hutcheon, R.Abegg, C.A.Davis, R.W.Finlay, P.W.Green, L.G.Greeniaus, D.V.Jordan, J.A.Niskanen, G.V.O'Rielly, T.A.Porcelli, S.D.Reitzner, P.L.Walden, S.Yen Charge Symmetry Breaking in np → dπ0 NUCLEAR REACTIONS 1H(n, π0), E=279.5 MeV; measured σ(θ), forward-backward asymmetry; deduced charge symmetry breaking. Comparison with model predictions.
doi: 10.1103/PhysRevLett.91.212302
2003SC11 Phys.Rev. C 67, 044003 (2003) S.Schneider, J.Haidenbauer, C.Hanhart, J.A.Niskanen Positive pion absorption on 3He using modern trinucleon wave functions NUCLEAR REACTIONS 3He(π+, p), E=120, 206, 250 MeV; calculated pion absorption σ(θ), polarization, wave function dependence. 1H(p, π+), E=515, 800 MeV; calculated analyzing power. Trinucleon wave functions, comparison with data.
doi: 10.1103/PhysRevC.67.044003
2002BE46 Phys.Rev. C65, 064001 (2002) M.Betigeri, J.Bojowald, A.Budzanowski, A.Chatterjee, J.Ernst, L.Freindl, D.Frekers, W.Garske, K.Grewer, A.Hamacher, J.Ilieva, L.Jarczyk, K.Kilian, S.Kliczewski, W.Klimala, D.Kolev, T.Kutsarova, J.Lieb, H.Machner, A.Magiera, R.Maier, H.Nann, J.Niskanen, D.Prasuhn, L.Pentchev, D.Protic, B.Razen, P.von Rossen, B.J.Roy, R.Siudak, A.Strzalkowski, R.Tsenov, K.Zwoll Measurement of the pp → ppπ0 Reaction at 850 MeV/c and Partial Wave Cross Sections NUCLEAR REACTIONS 1H(p, pπ0), E at 850 MeV/c; measured missing mass, σ(E); deduced σ. Comparison with previous results, model predictions.
doi: 10.1103/PhysRevC.65.064001
2002NI02 Phys.Rev. C65, 037001 (2002) Charge Symmetry Breaking in NN Scattering with an Interaction from Effective Field Theory
doi: 10.1103/PhysRevC.65.037001
2000NI12 Acta Phys.Pol. B31, 2683 (2000) Isospin Violation in Pion Production NUCLEAR REACTIONS 1H(n, π0), E ≈ threshold; calculated forward-backward charge asymmetry, related features.
2000OP01 Nucl.Phys. A663-664, 505c (2000) A.K.Opper, E.G.Auld, R.M.Churchman, C.A.Davis, R.W.Finlay, P.W.Green, L.G.Greeniaus, D.A.Hutcheon, D.V.Jordan, E.J.Korkmaz, J.A.Niskanen, G.V.O'Rielly, T.Porcelli, S.D.Reitzner, P.L.Walden, S.Yen Charge Symmetry Breaking in the Reaction np → dπ0 NUCLEAR REACTIONS 1H(n, π0), E=279.5 MeV; measured deuteron spectra, forward-backward asymmetry.
doi: 10.1016/S0375-9474(99)00642-9
2000VA26 Phys.Lett. 493B, 65 (2000) U.van Kolck, J.A.Niskanen, G.A.Miller Charge Symmetry Violation in pn → dπ0 and Chiral Effective Field Theory NUCLEAR REACTIONS 1H(n, π0), E(cm)=279.5 MeV; calculated integrated forward-backward asymmetry in σ(θ) near threshold. Charge symmetry violation discussed in connection with future experiments.
doi: 10.1016/S0370-2693(00)01133-3
1999FU09 Nucl.Phys. A655, 495 (1999) C.Furget, J.Goy, S.Kox, J.S.Real, J.Arvieux, E.J.Beise, L.Bimbot, E.Brash, H.Breuer, G.Collins, F.Duncan, J.E.Ducret, M.Garcon, R.Gilman, C.Glashausser, V.P.Ladygine, M.Morlet, F.Merchez, J.Niskanen, P.Rutt, E.Tomasi-Gustafsson, E.Voutier Measurement of Vector-Tensor Spin-Transfer Observables for the Reaction H(p(pol), d(pol))π+ between 580 and 1300 MeV NUCLEAR REACTIONS 1H(polarized p, π+), E=580-1300 MeV; measured deuterons σ(θ), analyzing power, tensor polarization, spin-transfer coefficients. Partial wave analysis, coupled channels model calculation.
doi: 10.1016/S0375-9474(99)00302-4
1999HA06 Phys.Rev.Lett. 82, 2258 (1999) H.Hahn, F.A.Duncan, J.Aclander, D.Ashery, E.G.Auld, D.R.Gill, D.A.Hutcheon, G.Jones, E.Korkmaz, S.Maytal-Beck, M.A.Moinester, J.A.Niskanen, D.Ottewell, A.Rahav, S.Ram, M.Sevior, P.L.Walden, R.Weiss Analyzing Powers and Partial Wave Decomposition of pn → pp(1S0)π- at Low Energies NUCLEAR REACTIONS 2H(polarized p, 2pπ-), E=353, 403, 440 MeV; measured pion, proton spectra, spectator momentum distributions. 1n(polarized p, pπ-)E=353, 403, 440 MeV; deduced analyzing powers for quasifree reaction. Partial wave analysis.
doi: 10.1103/PhysRevLett.82.2258
1999NI02 Phys.Lett. 456B, 107 (1999) Test of Final State Approximations using Threshold pp → ppπ0 NUCLEAR REACTIONS 1H(p, pπ0), E ≈ threshold; calculated transition matrix momentum dependence; deduced final state approximation features. Watson-Migdal method.
doi: 10.1016/S0370-2693(99)00480-3
1999NI06 Few-Body Systems 26, 241 (1999) Isospin Breaking in the Reaction np → dπ0 at Threshold NUCLEAR REACTIONS 1H(n, π0), E=278-350 MeV; calculated forward-backward asymmetry, meson mixing contributions.
doi: 10.1007/s006010050117
1998DU07 Phys.Rev.Lett. 80, 4390 (1998) F.Duncan, H.Hahn, C.Aclander, D.Ashery, E.G.Auld, D.R.Gill, D.A.Hutcheon, G.Jones, E.Korkmaz, S.Maytal-Beck, M.A.Moinester, J.A.Niskanen, D.Ottewell, A.Rahav, S.Ram, M.Sevior, P.L.Walden, R.Weiss Differential Cross Section of the pn → pp(1S0)π- Reaction Extracted from pd → pppπ- NUCLEAR REACTIONS 2H(polarized p, 2pπ-), E=353, 403, 440 MeV; measured spectator momentum distributions; deduced σ(θ(π), M(pp)) for pn reaction. Comparison with pion absorption data.
doi: 10.1103/PhysRevLett.80.4390
1997NI03 Phys.Lett. 394B, 253 (1997) Charge Dependence of NN → dπ NUCLEAR REACTIONS 1H(polarized n, π0), (polarized p, π+), E not given; calculated analyzing power at θ=90° vs parameter η; deduced isospin symmetry violating effects related features.
doi: 10.1016/S0370-2693(97)00005-1
1996CO02 Phys.Rev. C53, 1154 (1996) Two-Pion Exchange Contributions to Nuclear Charge Asymmetry NUCLEAR STRUCTURE 3H, 3He; calculated binding energy difference. Charge-symmetry-breaking two-pion exchange interaction.
doi: 10.1103/PhysRevC.53.1154
1996GR17 Phys.Rev. C54, 1970 (1996) A.M.Green, J.A.Niskanen, S.Wycech η-Deuteron Scattering NUCLEAR REACTIONS 2H(X, X), E=low; calculated ηd-scattering length; deduced need to go beyond fixed nucleon approximation.
doi: 10.1103/PhysRevC.54.1970
1996NI01 Phys.Rev. C53, 526 (1996) Comment on ' Role of Heavy Meson Exchange in Near Threshold NN → dπ ' NUCLEAR REACTIONS 1H(p, π+), E=low; calculated σ/(q(π)/m(π)). 1H(polarized p, π+), E=290.7, 515 MeV; calculated analyzing power vs θ; deduced heavy meson exchange related features.
doi: 10.1103/PhysRevC.53.526
1996NI16 Acta Phys.Pol. B27, 2845 (1996) Pion Production as a Probe of Two-Nucleon Axial Charge and Current
1996WI03 Nucl.Phys. A597, 613 (1996) P.Wilhelm, J.A.Niskanen, H.Arenhovel Signatures from Polarization Observables for Photon Absorption on a 1S0 Proton Pair
doi: 10.1016/0375-9474(95)00458-0
1995NI07 Nucl.Phys. A586, 693 (1995) J.A.Niskanen, P.Wilhelm, H.Arenhovel Quasifree Photoabsorption on Neutron-Proton Pairs in 3He NUCLEAR REACTIONS 3He(γ, np), (polarized γ, np), E=200-400 MeV; calculated photoabsorption σ(E), σ(θp), proton polarization, analyzing power, asymmetry vs θ. Quasifree absorption, nucleonic, meson exchange currents, Δ(1232)-isobar excitation.
doi: 10.1016/0375-9474(95)00037-2
1995NI13 Phys.Lett. 359B, 295 (1995) Pion vs. Photon Absorption on the Deuteron NUCLEAR REACTIONS 2H(π+, p), E not given; calculated absorption σ vs pion momentum. 2H(γ, n), E=140-440 MeV; calculated photodisintegration σ(E).
doi: 10.1016/0370-2693(95)01105-Y
1995WI14 Phys.Rev.Lett. 74, 1034 (1995) P.Wilhelm, H.Arenhovel, J.A.Niskanen Comment on ' Total Cross Section for Photon Absorption by Two Protons in 3He ' NUCLEAR REACTIONS 3He(γ, X), E ≈ 200-500 MeV; analyzed, reanalyzed σ(E) data analyses; deduced nonnegligible E1 multipole contribution.
doi: 10.1103/PhysRevLett.74.1034
1995WI16 Phys.Rev. C51, 2841 (1995) P.Wilhelm, J.A.Niskanen, H.Arenhovel Photon Absorption on a Proton-Proton Pair in 3He NUCLEAR REACTIONS 3He(γ, 2p), E=100-500 MeV; analyzed σ(E); deduced various multipole contributions, photon absorption mechanism, Δ role. Different models.
doi: 10.1103/PhysRevC.51.2841
1995WY01 Phys.Rev. C52, 544 (1995) S.Wycech, A.M.Green, J.A.Niskanen Are There η-Helium Bound States ( Question ) NUCLEAR REACTIONS 2H(p, X), (d, X), E not given; calculated eta production (amplitude)2, amplitude vs eta momentum; deduced (eta-4He) quasibound state evidence. Multiple scattering theory.
doi: 10.1103/PhysRevC.52.544
1994IQ01 Phys.Rev. C49, 355 (1994) Isobar Excitation in Parity Nonconserving Proton-Proton Scattering NUCLEAR REACTIONS 1H(polarized p, p), E=10-1000 MeV; calculated parity violating average longitudinal analyzing power. Meson exchange model, isobar excitation.
doi: 10.1103/PhysRevC.49.355
1994IQ02 Phys.Lett. 322B, 7 (1994) The Effect of Off-Shell Variations of (ρ(Omega)) Meson Mixing on Charged Symmetry Breaking Neutron-Proton Scattering NUCLEAR REACTIONS 1n(polarized p, p), E=183-800 MeV; calculated charge symmetry breaking observable vs θ; deduced ρ(omega)-mixing matrix off-shell variations implications.
doi: 10.1016/0370-2693(94)90482-0
1994NI02 Phys.Rev. C49, 1285 (1994) Impact of pp → ppπ0 Data to Negative-Pion Absorption on Proton Pairs NUCLEAR REACTIONS 1H(p, pπ0), E=290 MeV; calculated σ vs pion momentum. 3He(π-, X), E=62.5 MeV; calculated σ(θ), pion absorption on diproton. 1n(polarized p, pπ-), E=62.5; calculated polarization vs θ. 3He(π-, X), E=50-250 MeV; calculated absorption σ vs E.
doi: 10.1103/PhysRevC.49.1285
1994WI12 Phys.Lett. 335B, 109 (1994) P.Wilhelm, J.A.Niskanen, H.Arenhovel Photon Absorption on a Neutron-Proton Pair in 3He NUCLEAR REACTIONS 3He(γ, np), E=245 MeV; calculated σ(θ); deduced spectator role importance. Quasifree two-body model.
doi: 10.1016/0370-2693(94)91399-4
1993AC01 Phys.Lett. 300B, 19 (1993) J.Aclander, S.May Tal-Beck, A.Altman, D.Ashery, H.Hahn, M.A.Moinester, A.Rahav, A.Feltham, G.Jones, M.Pavan, M.Sevior, D.Hutcheon, D.Ottewell, G.R.Smith, J.A.Niskanen Proton Polarization from π+ Absorption in 4He NUCLEAR REACTIONS 3,4He(π+, pX), E=120, 250 MeV; 2H(π+, p), E=120, 250 MeV; measured proton polarization, undetected nucleon yield.
doi: 10.1016/0370-2693(93)90741-Y
1993ME03 Phys.Rev. C47, R2474 (1993) Quasifree Pion Production in the Three-Nucleon System NUCLEAR REACTIONS 1n(p, π0), 2H(p, pπ0), E not given; calculated σ; deduced quasifree process role in pd → pdπ0.
doi: 10.1103/PhysRevC.47.2474
1992MA17 Phys.Rev.Lett. 68, 3012 (1992) S.May Tal-Beck, J.Aclander, A.Altman, D.Ashery, H.Hahn, M.A.Moinester, A.Rahav, A.Feltham, G.Jones, M.Pavan, M.Sevior, D.Hutcheon, D.Ottewell, G.R.Smith, J.A.Niskanen Proton Polarization from π+ Absorption in 3He NUCLEAR REACTIONS 3He(π+, p), E=120, 250 MeV; measured proton polarization vs θ following pion absorption; deduced nuclear density dependence, short range correlations role. Quasideuteron absorption kinematics.
doi: 10.1103/PhysRevLett.68.3012
1992NI05 Phys.Rev. C45, 3021 (1992) Effect of Inelasticity in Charge Sysmmetry Breaking Neutron-Proton Scattering NUCLEAR REACTIONS 1H(polarized n, n), E=800 MeV; calcualted symmetry breaking obsevable ΔA(θ), charge symmetric A(θ); deduced inelasticity role.
doi: 10.1103/PhysRevC.45.3021
1992NI08 Phys.Lett. 289B, 227 (1992) Energy Dependence of the pp → (pp) (S-Wave) π0 Total Cross Section NUCLEAR REACTIONS 1H(p, pπ0), E ≤ 700 MeV; calculated σ vs E; deduced rescattering effects role. Direct pion production plus pion rescattering through Δ-isobar.
doi: 10.1016/0370-2693(92)91210-Z
1991GR17 Phys.Lett. 265B, 223 (1991) A.M.Green, B.Moussallam, J.A.Niskanen, M.E.Sainio, S.Wycech Violation of G-Parity in Antinucleon-Nucleon Annihilation NUCLEAR REACTIONS 1H(n-bar, π+π0), E at 0.39 GeV/c; calculated σ asymmetry. G-parity violation.
doi: 10.1016/0370-2693(91)90045-R
1991NI01 Phys.Rev. C43, 36 (1991) π- Absorption on the Diproton in 3He NUCLEAR REACTIONS 3He(π-, X), E ≈ 100-200 MeV; calculated absorption σ(E), σ(θ), outgoing proton polarization. Two-nucleon final state interactions, third nucleon spectator, phenomenological Hamiltonian.
doi: 10.1103/PhysRevC.43.36
1991NI04 Phys.Rev. C44, 2222 (1991) Effect of the 1S0 Neutron Proton Pair on Positive Pion Absorption in 3He NUCLEAR REACTIONS 3He(π+, X), E=62-250 MeV; calculated pion absorption reduced matrix amplitude, outgoing proton polarization, analyzing power vs θ; deduced isotriplet neutron-proton pair contribution estimate.
doi: 10.1103/PhysRevC.44.2222
1990IQ01 Phys.Rev. C42, 1872 (1990) Parity Violating Nuclear Force by Meson Mixing NUCLEAR REACTIONS 1H(polarized p, p), E=10-1000 MeV; calculated average longitudinal analyzing power; deduced form factors, correlations role. Meson mixing, parity violating interaction.
doi: 10.1103/PhysRevC.42.1872
1989NI01 Phys.Lett. 218B, 272 (1989) ρ(Omega) Meson Mixing in the Reaction np → dπ0 NUCLEAR REACTIONS 1n(p, π0), E=580, 800 MeV; calculated pion production σ asymmetry; deduced ρ(omega) mixing role.
doi: 10.1016/0370-2693(89)91579-7
1989NI05 Phys.Rev. C40, 2420 (1989) J.A.Niskanen, L.Swift, A.W.Thomas Pion Absorption on Polarized 3He NUCLEAR REACTIONS 3He(π+, X), E=62-246 MeV; calculated analyzing power vs E. Polarized 3He, deuteron-like pair absorbs pion.
doi: 10.1103/PhysRevC.40.2420
1988GE03 Few-Body Systems 3, 171 (1988) A.Gersten, L.G.Greeniaus, J.A.Niskanen, S.Ishikawa, T.Sasakawa, A.W.Thomas Test of Charge Symmetry in Few-Body Systems NUCLEAR REACTIONS 1H(n, n), 2H(d, d), E not given; compiled, theoretical, experimental work; deduced charge symmetry breaking status.
doi: 10.1007/BF01077594
1988IQ01 Phys.Rev. C38, 2259 (1988) Charge Symmetry Breaking in Neutron-Proton Scattering Including Arbitrary Mesons NUCLEAR REACTIONS 1n(polarized p, p), 1H(polarized n, n), E=100 MeV; analyzed polarization asymmetry data; deduced charge symmetry breaking sensitivity to meson-nucleon form factors.
doi: 10.1103/PhysRevC.38.2259
1988NI01 Phys.Rev. C37, 1755 (1988) Possibility of Isospin Breaking in the Deuteron NUCLEAR STRUCTURE 2H; calculated isospin mixing in wave function. Pion, nucleon, isobar mass differences.
doi: 10.1103/PhysRevC.37.1755
1988NI06 Phys.Rev. C38, 838 (1988) J.A.Niskanen, M.Sebestyen, A.W.Thomas Charge Symmetry Breaking in the Reaction np → dπ0 NUCLEAR REACTIONS 1H(n, π0), E=477, 580 MeV; calculated σ(θ); deduced charge symmetry breaking effects. Coupled-channels model.
doi: 10.1103/PhysRevC.38.838
1988NI07 Aust.J.Phys. 41, 31 (1988) Charge Symmetry Breaking in Neutron-Proton Scattering above Pion Production Threshold NUCLEAR REACTIONS 1n(p, p), E=477-800 MeV; calculated (A(n)-A(p)); deduced nucleon-isobar channel role.
doi: 10.1071/PH880031
1987NI09 Phys.Lett. 196B, 299 (1987) Quasi-Two-Body Pion Absorption on Helium-3 NUCLEAR STRUCTURE 3He; calculated n-p correlation function. NUCLEAR REACTIONS 2H(π+, p), E=62-246 MeV; calculated proton polarization observables, σ(θ).
doi: 10.1016/0370-2693(87)90735-0
1986GR25 Phys.Scr. 34, 550 (1986) The Effect of Short Range Repulsions on N(N-Bar) Annihilation NUCLEAR REACTIONS 1H(p-bar, π), 1n(n-bar, π0), E=50, 100, 200 MeV; calculated total, annihilation σ. Skyrmion-antiskyrmion model.
doi: 10.1088/0031-8949/34/6A/010
1985WY01 Phys.Lett. 152B, 308 (1985) S.Wycech, A.M.Green, J.A.Niskanen On the Energy Levels in Antiprotonic Deuterium ATOMIC PHYSICS 2H(p-bar, p-bar), E at rest; calculated antiprotonic level shifts, Γ. Separable potentials.
doi: 10.1016/0370-2693(85)90501-5
1984DU04 Nucl.Phys. A412, 195 (1984) O.Dumbrajs, A.M.Green, J.A.Niskanen Low-Energy Scattering Parameters and Atomic Level Shifts in the (p-bar)16O, (p-bar)32S and (p-bar)40Ca Systems NUCLEAR REACTIONS 16O, 32S, 40Ca(p-bar, p-bar), E=low; calculated scattering parameters; deduced atomic level shift, scattering parameter relationship. Optical potential.
doi: 10.1016/0375-9474(84)90678-X
1984MO25 Phys.Lett. 146B, 379 (1984) A.Moalem, J.A.Niskanen, A.M.Green Direct Formation of NN(bar) Bound States in a Single Nucleon Pickup NUCLEAR REACTIONS 4He(p-bar, X), E=low; calculated σ(θ) for nucleon-antinucleon (X) bound states; deduced nucleon-antinucleon state parameters.
doi: 10.1016/0370-2693(84)90143-6
1984NI07 Phys.Lett. 141B, 301 (1984) Some Improvements in the Coupled Channels Calculations of the Reaction p + p → d + π+ NUCLEAR REACTIONS 1H(p, π+), E=300-800 MeV; calculated total pion production σ(E). 1H(polarized p, π+), E=580 MeV; calculated σ(θ), asymmetry vs θ. Coupled-channels, isobar contribution.
doi: 10.1016/0370-2693(84)90249-1
1983NI07 Nucl.Phys. A404, 495 (1983) Antiproton Nuclear Scattering in a Microscopic Potential Model NUCLEAR REACTIONS 12C, 16O, 32S, 40Ca(p-bar, p-bar), E=35, 75, 130 MeV; 40Ca(p-bar, p-bar), E=200 MeV; calculated σ(θ), absorption σ. Energy dependent optical model.
doi: 10.1016/0375-9474(83)90273-7
1979NI03 Phys.Lett. 82B, 187 (1979) Polarization of the Deuteron in the Reaction p + p → d + π+ NUCLEAR REACTIONS 1H(p, π+); calculated d-polarization; deduced small interaction-dependent vector, large model-independent tensor polarizations. Isobar model, different interactions.
doi: 10.1016/0370-2693(79)90732-9
1978NI01 Nucl.Phys. A298, 417 (1978) The Differential Cross Section and Polarization in p+p → d+π+ NUCLEAR REACTIONS 1H(p, π+d), E=threshold-750 MeV; calculated σ, polarization.
doi: 10.1016/0375-9474(78)90142-2
1978NI03 Phys.Lett. 79B, 190 (1978) The Reaction p + p → d + π+ with a Polarized Beam and Target NUCLEAR REACTIONS 1H(polarized p, π+), E=300-700 MeV; calculated σ(θ); deduced D-state probability. polarized target.
doi: 10.1016/0370-2693(78)90219-8
1977NI04 Phys.Lett. 71B, 40 (1977) The Differential Cross Section and Polarization in P + P → D + π+ NUCLEAR REACTIONS 1H(p, π+d), E=threshold-750 MeV; calculated σ(E), polarization.
doi: 10.1016/0370-2693(77)90734-1
1975GR05 Nucl.Phys. A240, 263 (1975) The Effect of Resonances in 8Be on α-α Bremsstrahlung NUCLEAR REACTIONS 4He(α, α); calculated effect of enhanced quadrupole matrix element on bremsstrahlung σ.
doi: 10.1016/0375-9474(75)90330-9
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