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Search: Author = R.G.Timmermans

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2022ZH26      Phys.Rev. C 105, 054005 (2022)

D.Zhou, B.Long, R.G.E.Timmermans, U.van Kolck

Renormalization of one-pion exchange in chiral effective field theory for antinucleon-nucleon scattering

doi: 10.1103/PhysRevC.105.054005
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2021OO01      Phys.Lett. B 820, 136525 (2021)

F.Oosterhof, J.de Vries, R.G.E.Timmermans, U.van Kolck

Nucleon decay in the deuteron

doi: 10.1016/j.physletb.2021.136525
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2019OO01      Phys.Rev.Lett. 122, 172501 (2019)

F.Oosterhof, B.Long, J.de Vries, R.G.E.Timmermans, U.van Kolck

Baryon-Number Violation by Two Units and the Deuteron Lifetime

NUCLEAR STRUCTURE 2H; calculated the lifetime of the deuteron with dimension-nine quark operators that violate baryon number by two units.

doi: 10.1103/PhysRevLett.122.172501
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2016NO08      Phys.Rev. C 94, 025502 (2016)

J.P.Noordmans, J.de Vries, R.G.E.Timmermans

Tests of Lorentz and CPT symmetry with hadrons and nuclei

doi: 10.1103/PhysRevC.94.025502
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2016SY01      Phys.Rev. C 94, 025503 (2016)

A.Sytema, J.E.van den Berg, O.Boll, D.Chernowitz, E.A.Dijck, J.O.Grasdijk, S.Hoekstra, K.Jungmann, S.C.Mathavan, C.Meinema, A.Mohanty, S.E.Muller, J.P.Noordmans, M.Nunez Portela, C.J.G.Onderwater, C.Pijpker, R.G.E.Timmermans, K.K.Vos, L.Willmann, H.W.Wilschut

Test of Lorentz invariance in β decay of polarized 20Na

RADIOACTIVITY 20Na(β+)[polarized 20Na source from 1H(20Ne, n), E=20 MeV/nucleon at AGOR-KVI cyclotron facility, polarization by optical pumping]; measured Eβ, Iβ, Eγ, Iγ, polarization, dependence of half-life of 20Na nuclei on the nuclear spin direction; deduced no significant violation of Lorentz invariance (LIV) in weak interactions.

doi: 10.1103/PhysRevC.94.025503
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2015VO04      Phys.Rev. C 91, 038501 (2015)

K.K.Vos, H.W.Wilschut, R.G.E.Timmermans

Testing Lorentz invariance in orbital electron capture

RADIOACTIVITY 37Ar, 49V, 53Mn, 55Fe, 71Ge, 97Tc, 131Cs, 137La, 163Ho, 165Er, 179Ta, 205Pb(EC); calculated Lorentz-violating differential decay rate in orbital electron capture. Discussed options for producing strong sources, competitive experiments and their required precision. 37Ar and 131Cs identified as the best sources for experimental studies.

doi: 10.1103/PhysRevC.91.038501
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2015VO15      Phys.Rev. C 92, 052501 (2015)

K.K.Vos, H.W.Wilschut, R.G.E.Timmermans

Concurrent tests of Lorentz invariance in β-decay experiments

doi: 10.1103/PhysRevC.92.052501
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2013ME12      Phys.Rev. C 88, 034001 (2013)

E.Mereghetti, J.de Vries, R.G.E.Timmermans, U.van Kolck

Toroidal quadrupole form factor of the deuteron

doi: 10.1103/PhysRevC.88.034001
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2013NO01      Phys.Rev. C 87, 055502 (2013)

J.P.Noordmans, H.W.Wilschut, R.G.E.Timmermans

Lorentz violation in neutron decay and allowed nuclear β decay

RADIOACTIVITY 1n(β-); calculated general decay rate for allowed β decay incorporating the modified W-boson propagator. Discussed Lorentz violation in Fermi, Gamow-Teller, and mixed β transitions. Implications for future experiments to search for Lorentz violation.

doi: 10.1103/PhysRevC.87.055502
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2013ZH14      Phys.Rev. C 87, 054005 (2013)

D.Zhou, R.G.E.Timmermans

Polarization observables in low-energy antiproton-proton scattering

NUCLEAR REACTIONS 1H(p-bar, p-bar), (p-bar, n-bar), (p-bar, X), E at <925 MeV/c; calculated σ(θ, E), total σ(E), depolarization, polarization transfer, rotation parameter, spin correlation coefficient using energy-dependent partial-wave analysis (PWA). Implications for achieving transverse polarization of an antiproton beam.

doi: 10.1103/PhysRevC.87.054005
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2012LI29      Phys.Lett. B 713, 447 (2012)

C.-P.Liu, J.de Vries, E.Mereghetti, R.G.E.Timmermans, U.van Kolck

Deuteron magnetic quadrupole moment from chiral effective field theory

NUCLEAR STRUCTURE 2H; calculated magnetic quadrupole moment of the deuteron; QCD calculations, comparison with available data.

doi: 10.1016/j.physletb.2012.06.024
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2012WA24      Phys.Rev. C 86, 015503 (2012)

L.W.Wansbeek, S.Schlesser, B.K.Sahoo, A.E.L.Dieperink, C.J.G.Onderwater, R.G.E.Timmermans

Charge radii of radium isotopes

NUCLEAR MOMENTS 208,209,210,211,212,213,220,221,222,223,224,225,226,227,228,229,230,232Ra; analyzed optical isotope shifts from experiments at ISOLDE, CERN and at KVI; deduced King plots, charge radii. Relevance to atomic parity violation in a chain of Ra isotopes.Comparison with theoretical atomic structure calculations.

doi: 10.1103/PhysRevC.86.015503
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2012ZH41      Phys.Rev. C 86, 044003 (2012)

D.Zhou, R.G.E.Timmermans

Energy-dependent partial-wave analysis of all antiproton-proton scattering data below 925 MeV/c

doi: 10.1103/PhysRevC.86.044003
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2011DE34      Phys.Rev. C 84, 065501 (2011)

J.de Vries, R.Higa, C.-P.Liu, E.Mereghetti, I.Stetcu, R.G.E.Timmermans, U.van Kolck

Electric dipole moments of light nuclei from chiral effective field theory

NUCLEAR STRUCTURE 2,3H, 3He; calculated electric dipole moments by systematic expansion provided by chiral effective field theory (EFT) taking into account parity and time reversal violation.

doi: 10.1103/PhysRevC.84.065501
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2008LI14      Phys.Rev. C 77, 044001 (2008)

Y.Li, M.K.Liou, W.M.Schreiber, B.F.Gibson, R.G.E.Timmermans

Meson exchange currents in neutron-proton bremsstrahlung

doi: 10.1103/PhysRevC.77.044001
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2007CO03      Phys.Rev. C 75, 014006 (2007)

M.D.Cozma, O.Scholten, R.G.E.Timmermans, J.A.Tjon

Two-pion exchange contributions to the relativistic NN kernel: Peripheral scattering

doi: 10.1103/PhysRevC.75.014006
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2007LI54      Phys.Rev. C 76, 035503 (2007)

C.-P.Liu, M.J.Ramsey-Musolf, W.C.Haxton, R.G.E.Timmermans, A.E.L.Dieperink

Atomic electric dipole moments: The Schiff theorem and its corrections

doi: 10.1103/PhysRevC.76.035503
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2006ER02      Phys.Rev. C 73, 044009 (2006)

G.Erkol, R.G.E.Timmermans, M.Oka, Th.A.Rijken

Scalar-meson-baryon coupling constants in QCD sum rules

doi: 10.1103/PhysRevC.73.044009
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2006ER07      Phys.Rev. C 74, 045201 (2006)

G.Erkol, R.G.E.Timmermans, Th.A.Rijken

Vector-meson-baryon coupling constants in QCD sum rules

doi: 10.1103/PhysRevC.74.045201
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2006LI11      Phys.Lett. B 634, 488 (2006)

C.-P.Liu, R.G.E.Timmermans

Time-reversal violation in threshold (n(pol)) (p(pol)) scattering

NUCLEAR REACTIONS 1H(polarized n, n'), E=0.025 eV; calculated parity violating asymmetry, spin rotation and longitudinal polarization. Polarized target, compared various potentials.

doi: 10.1016/j.physletb.2006.02.013
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2006TI03      Phys.Rev. C 73, 034006 (2006)

R.G.E.Timmermans, T.D.Penninga, B.F.Gibson, M.K.Liou

Nucleon-nucleon bremsstrahlung: Anomalous magnetic moment effects

NUCLEAR REACTIONS 1H(p, p'γ), E=157, 280 MeV; 1H(n, n'γ), E=200, 225 MeV; calculated bremsstrahlung σ(θ(1), θ(2), θ(γ)), contribution from anomalous magnetic moment.

doi: 10.1103/PhysRevC.73.034006
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2005ER04      Phys.Rev. C 72, 035209 (2005)

G.Erkol, R.G.E.Timmermans, Th.A.Rijken

Nucleon-sigma coupling constant in QCD sum rules

doi: 10.1103/PhysRevC.72.035209
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2005NO14      Phys.Rev. C 72, 054006 (2005)

A.Nogga, R.G.E.Timmermans, U.van Kolck

Renormalization of one-pion exchange and power counting

doi: 10.1103/PhysRevC.72.054006
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2004CH37      Phys.Rev. C 70, 015201 (2004)

X.-S.Chen, R.G.E.Timmermans, W.-Mi.Sun, H.-S.Zong, F.Wang

Examination of the strangeness contribution to the nucleon magnetic moment

NUCLEAR STRUCTURE 1n, 1H; calculated strangeness contribution to magnetic moment. Meson cloud model.

doi: 10.1103/PhysRevC.70.015201
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2004FR29      Phys.Rev. C 70, 044001 (2004)

J.L.Friar, U.van Kolck, M.C.M.Rentmeester, R.G.E.Timmermans

Nucleon-mass difference in chiral perturbation theory and nuclear forces

doi: 10.1103/PhysRevC.70.044001
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2004LI06      Phys.Rev. C 69, 011001 (2004)

M.K.Liou, T.D.Penninga, R.G.E.Timmermans, B.F.Gibson

Soft-photon analysis of nucleon-nucleon bremsstrahlung: Anomalous magnetic moment effects

NUCLEAR REACTIONS 1H(p, p'γ), E=190, 280 MeV; 1n(p, p'γ), E=225 MeV; calculated bremsstrahlung σ(E, θ); deduced effect of anomalous magnetic moments. Comparisons with data.

doi: 10.1103/PhysRevC.69.011001
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2004LI68      Phys.Rev. C 70, 055501 (2004)

C.-P.Liu, R.G.E.Timmermans

P- and T-odd two-nucleon interaction and the deuteron electric dipole moment

NUCLEAR STRUCTURE 2H; calculated two-nucleon interaction features, deuteron electric dipole moment.

NUCLEAR MOMENTS 2H; calculated two-nucleon interaction features, deuteron electric dipole moment.

doi: 10.1103/PhysRevC.70.055501
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2003CO18      Phys.Rev. C 68, 044003 (2003)

M.D.Cozma, O.Scholten, R.G.E.Timmermans, J.A.Tjon

Sensitivity of pp bremsstrahlung on low-energy NN interaction

NUCLEAR REACTIONS 1H(p, p'γ), E=0-250 MeV; analyzed bremsstrahlung σ, σ(θ), analyzing powers, partial wave contributions; deduced sensitivity to low-energy interaction model. Relativistic covariant model.

doi: 10.1103/PhysRevC.68.044003
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2003RE12      Phys.Rev. C 67, 044001 (2003)

M.C.M.Rentmeester, R.G.E.Timmermans, J.J.de Swart

Determination of the chiral coupling constants c3 and c4 in new pp and np partial-wave analyses

NUCLEAR REACTIONS 1H(p, p), (n, n), E < 500 MeV; analyzed data; deduced chiral coupling constants. Partial wave analysis.

doi: 10.1103/PhysRevC.67.044001
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2002CO02      Phys.Rev. C65, 024001 (2002)

M.D.Cozma, G.H.Martinus, O.Scholten, R.G.E.Timmermans, J.A.Tjon

Covariant Model for Proton-Proton Bremsstrahlung: Comparison with high-precision data

NUCLEAR REACTIONS 1H(p, p'γ), E=190 MeV; calculated bremsstrahlung σ(θ), Ay(θ). Relativistic covariant model, comparison with data.

doi: 10.1103/PhysRevC.65.024001
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2002DE59      Phys.Rev. C 66, 064002 (2002)

J.J.de Swart, R.G.E.Timmermans

Angle-dependent normalization of neutron-proton differential cross sections

NUCLEAR REACTIONS 1H(n, n), E=162-344 MeV; analyzed σ(θ); deduced normalization between various data sets.

doi: 10.1103/PhysRevC.66.064002
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2002KO01      Phys.Rev. C65, 015208 (2002)

C.L.Korpa, A.E.L.Dieperink, R.G.E.Timmermans

Hyperon-Nucleon Scattering and Hyperon Masses in the Nuclear Medium

doi: 10.1103/PhysRevC.65.015208
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2002TI01      Phys.Rev. C65, 014001 (2002)

R.G.E.Timmermans, B.F.Gibson, Y.Li, M.K.Liou

Noncoplanarity in Proton-Proton Bremsstrahlung

NUCLEAR REACTIONS 1H(p, p'γ), E=190, 280 MeV; calculated noncoplanar σ(θ). Soft-photon approximation, comparisons with data.

doi: 10.1103/PhysRevC.65.014001
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2002TI04      Phys.Rev. C65, 064007 (2002)

R.G.E.Timmermans, A.Yu.Korchin, E.N.E.van Dalen, A.E.L.Dieperink

Soft Electroweak Bremsstrahlung: Theorems and astrophysical relevance

NUCLEAR REACTIONS 1n, 1H(n, nX), (n, pX), E not given; calculated electroweak bremsstrahlung amplitudes, matrix elements, axial-vector currents. 1n(n, nνν-bar), E at 50-300 MeV/c; calculated σ. Astrophysical implications discussed.

doi: 10.1103/PhysRevC.65.064007
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2001RE17      Phys.Rev. C64, 034004 (2001)

M.C.M.Rentmeester, R.G.E.Timmermans, J.J.de Swart

Normalization of Neutron-Proton Differential Cross Sections

NUCLEAR REACTIONS 1H(n, n), E ≈ 160-350 MeV; analyzed σ(θ) from various experiments; deduced normalization factors. Energy-dependent Nijmegen partial wave analysis.

doi: 10.1103/PhysRevC.64.034004
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2001TI04      Nucl.Phys. A689, 23c (2001)


Chiral Two-Pion Exchange in the Nucleon-Nucleon Interaction

doi: 10.1016/S0375-9474(01)00815-6
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2000HU03      Phys.Lett. 476B, 9 (2000)

H.Huisman, J.C.S.Bacelar, M.J.Van Goethem, M.N.Harakeh, M.Hoefman, N.Kalantar-Nayestanaki, H.Lohner, J.G.Messchendorp, R.W.Ostendorf, S.Schadmand, O.Scholten, R.S.Simon, R.G.E.Timmermans, M.Volkerts, H.W.Wilschut

Dynamical Effects in Proton-Proton Bremsstrahlung for Non-Coplanar Geometries

NUCLEAR REACTIONS 1H(polarized p, pγ), E=190 MeV; measured σ(θ), analyzing power. Two-arm photon spectrometer, comparisons with model predictions.

doi: 10.1016/S0370-2693(00)00130-1
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1999HU15      Phys.Rev.Lett. 83, 4017 (1999)

H.Huisman, J.C.S.Bacelar, M.J.van Goethem, M.N.Harakeh, M.Hoefman, N.Kalantar-Nayestanaki, H.Lohner, J.G.Messchendorp, R.W.Ostendorf, S.Schadmand, O.Scholten, R.G.E.Timmermans, R.Turrisi, M.Volkerts, H.W.Wilschut, R.S.Simon, A.Kugler, V.Wagner

High-Precision Proton-Proton Bremsstrahlung Measurements below the Pion-Production Threshold

NUCLEAR REACTIONS 1H(polarized p, pγ), E=190 MeV; measured σ(θ), analyzing powers in coplanar kinematics. Comparison with calculations.

doi: 10.1103/PhysRevLett.83.4017
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1999RE10      Phys.Rev.Lett. 82, 4992 (1999)

M.C.M.Rentmeester, R.G.E.Timmermans, J.L.Friar, J.J.de Swart

Chiral Two-Pion Exchange and Proton-Proton Partial-Wave Analysis

doi: 10.1103/PhysRevLett.82.4992
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1998GI03      Nucl.Phys. A628, 417 (1998)

B.F.Gibson, R.G.E.Timmermans

The π+-Emission Puzzle in (Λ)4He Decay

NUCLEAR STRUCTURE 4He; analyzed hypernucleus weak decay pion spectra, related features; deduced three-body decay mechanism.

doi: 10.1016/S0375-9474(97)00642-8
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1998KO53      Phys.Lett. 438B, 1 (1998)

A.Yu.Korchin, O.Scholten, R.G.E.Timmermans

Pion and Photon Couplings of N* Resonances from Scattering on the Proton

NUCLEAR REACTIONS 1H(π, π), (γ, π), E < 800 MeV; 1H(γ, γ), E=200-500 MeV; analyzed phase shifts, σ(θ); deduced resonance coupling features.

doi: 10.1016/S0370-2693(98)01041-7
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1998TI01      Nucl.Phys. A631, 343c (1998)


Low-Energy Pion-Nucleon Interaction

doi: 10.1016/S0375-9474(98)00032-3
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1995TI03      Nucl.Phys. A585, 143c (1995)

R.G.E.Timmermans, Th.A.Rijken, J.J.de Swart

(Lambda)NK and ΣNK Couplings from LEAR PS185 Data

NUCLEAR REACTIONS 1H(p-bar, X), E at 1435, 1546 MeV/c; compiled, reviewed this, other data analyses; deduced Goldberger-Treiman relations violation features.

doi: 10.1016/0375-9474(94)00557-4
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