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Search: Author = H.J.Leisi

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2001SC40      Eur.Phys.J. C 21, 473 (2001)

H.-Ch.Schroder, A.Badertscher, P.F.A.Goudsmit, M.Janousch, H.J.Leisi, E.Matsinos, D.Sigg, Z.G.Zhao, D.Chatellard, J.-P.Egger, K.Gabathuler, P.Hauser, L.M.Simons, A.J.R.El Hassani

The Pion-Nucleon Scattering Lengths from Pionic Hydrogen and Deuterium

ATOMIC PHYSICS, Mesic-atoms ^1,2H(π^-, X), E at rest; measured X-ray spectra; deduced strong-interaction energy level shift, decay widths, pion-nucleon scattering length.

NUCLEAR REACTIONS ^1,2H(π^-, X), E at rest; measured X-ray spectra; deduced strong-interaction energy level shift, decay widths, pion-nucleon scattering length.

1999SC40      Phys.Lett. 469B, 25 (1999)

H.-Ch.Schroder, A.Badertscher, P.F.A.Goudsmit, M.Janousch, H.J.Leisi, E.Matsinos, D.Sigg, Z.G.Zhao, D.Chatellard, J.-P.Egger, E.Jeannet, K.Gabathuler, P.Hauser, L.M.Simons, A.J.R.El Hassani

Determination of the πN Scattering Lengths from Pionic Hydrogen

ATOMIC PHYSICS, Mesic-atoms ¹H; measured X-ray spectra; deduced pionic hydrogen level energy, width, πN scattering lengths.

doi: 10.1016/S0370-2693(99)01237-X
Citations: PlumX Metrics

1997CH44      Nucl.Phys. A625, 855 (1997)

D.Chatellard, J.-P.Egger, E.Jeannet, A.Badertscher, M.Bogdan, P.F.A.Goudsmit, M.Janousch, H.J.Leisi, E.Matsinos, H.-Ch.Schroder, D.Sigg, Z.G.Zhao, E.C.Aschenauer, K.Gabathuler, P.Hauser, L.M.Simons, A.J.R.El Hassani

X-Ray Spectroscopy of the Pionic Deuterium Atom

NUCLEAR REACTIONS ^1,2H(π^-, X), E at 85 MeV/c; measured X-ray spectra; deduced 1S-level strong interaction shift, width, pionic deuterium S-wave scattering length.

ATOMIC PHYSICS, Mesic-Atoms ^1,2H(π^-, X), E at 85 MeV/c; measured X-ray spectra; deduced 1S-level strong interaction shift, width, pionic deuterium S-wave scattering length.

doi: 10.1016/S0375-9474(97)00466-1
Citations: PlumX Metrics

1997JA13      Phys.Lett. 414B, 237 (1997)

M.Janousch, A.Badertscher, P.F.A.Goudsmit, H.J.Leisi, E.Matsinos, P.Weber, Z.G.Zhao

Destructive Interference of s and p Waves in 180° π^-p Elastic Scattering

NUCLEAR REACTIONS ¹H(π^-, π^-), E=43.6-72 MeV; measured σ(θ); deduced destructive interference.

doi: 10.1016/S0370-2693(97)01169-6
Citations: PlumX Metrics

1996SI21      Nucl.Phys. A609, 269 (1996); Erratum Nucl.Phys. A617, 526 (1997)

D.Sigg, A.Badertscher, M.Bogdan, P.F.A.Goudsmit, H.J.Leisi, H.-Ch.Schroder, Z.G.Zhao, D.Chatellard, J.-P.Egger, E.Jeannet, E.C.Aschenauer, K.Gabathuler, L.M.Simons, A.J.R.El Hassani

The Strong Interaction Shift and Width of the Ground State of Pionic Hydrogen

ATOMIC PHYSICS, Mesic-Atoms ¹H(π^-, X), E at rest; measured X-ray spectra; deduced strong interaction shift, width.

doi: 10.1016/S0375-9474(96)00280-1
Citations: PlumX Metrics

1996SI22      Nucl.Phys. A609, 310 (1996)

D.Sigg, A.Badertscher, P.F.A.Goudsmit, H.J.Leisi, G.C.Oades

Electromagnetic Corrections to the s-Wave Scattering Lengths in Pionic Hydrogen

NUCLEAR REACTIONS ¹H(π^-, π^-), E=low; calculated scattering length corrections; ¹H(π^-, π⁰), E=low; calculated σ(E), scattering length corrections. Relativistic two-channel approach.

doi: 10.1016/S0375-9474(96)00238-2
Citations: PlumX Metrics

1995BA19      Nucl.Phys. A585, 49c (1995)

A.Badertscher, E.C.Aschenauer, M.Bogdan, D.Chatellard, J.-P.Egger, P.F.A.Goudsmit, K.Gabathuler, P.Hauser, A.J.R.El Hassani, E.Jeannet, M.Janousch, H.J.Leisi, E.Matsinos, H.-Ch.Schroder, D.Sigg, L.M.Simons, Z.G.Zhao

Measurement of the Strong Interaction Shift and Width of the 1S State in Pionic Hydrogen

ATOMIC PHYSICS, Mesic-Atoms ¹H(π^-, X), E at rest; measured X-ray spectra; deduced 3P-1S transition energy, line shape.

NUCLEAR REACTIONS ¹H(π^-, X), E at rest; measured X-ray spectra; deduced 3P-1S transition energy, line shape.

doi: 10.1016/0375-9474(94)00542-U
Citations: PlumX Metrics

1995CH50      Phys.Rev.Lett. 74, 4157 (1995)

D.Chatellard, J.-P.Egger, E.Jeannet, A.Badertscher, M.Bogdan, P.F.A.Goudsmit, H.J.Leisi, E.Matsinos, H.-Ch.Schroder, D.Sigg, Z.G.Zhao, E.C.Aschenauer, K.Gabathuler, P.Hauser, L.M.Simons, A.J.R.El Hassani

Determination of the S-Wave Scattering Length in Pionic Deuterium with a High Resolution Crystal Spectrometer

NUCLEAR REACTIONS ²H(π^-, X), E at 85 MeV/c; measured X-ray spectra; deduced 1S level strong interaction shift, total decay width.

ATOMIC PHYSICS, Mesic-Atoms ²H(π^-, X), E at 85 MeV/c; measured X-ray spectra; deduced 1S level strong interaction shift, total decay width.

doi: 10.1103/PhysRevLett.74.4157
Citations: PlumX Metrics

1995EL04      Z.Phys. A351, 113 (1995)

A.J.R.El-Hassani, W.Beer, J.-F.Gilot, P.F.A.Goudsmit, H.J.Leisi, S.Thomann, W.Volken, E.C.Aschenauer, K.Gabathuler, L.M.Simons, E.Bovet, J.P.Egger, G.Fiorucci, V.E.Markushin

Measurement of Absolute Yields of Lyman Transitions in Pionic Hydrogen and Deuterium as a Function of Pressure

NUCLEAR REACTIONS ^1,2H(π^-, X), E at 85 MeV/c; measured pionic E X-ray, I X-ray, π(X-ray)-coin; deduced transitions absolute K X-ray yields.

ATOMIC PHYSICS, Mesic-Atoms ^1,2H(π^-, X), E at 85 MeV/c; measured pionic E X-ray, I X-ray, π(X-ray)-coin; deduced transitions absolute K X-ray yields.

1995SI25      Phys.Rev.Lett. 75, 3245 (1995)

D.Sigg, A.Badertscher, M.Bogdan, P.F.A.Goudsmit, H.J.Leisi, E.Matsinos, H.-Ch.Schroder, Z.G.Zhao, D.Chatellard, J.-P.Egger, E.Jeannet, E.C.Aschenauer, K.Gabathuler, L.M.Simons, A.J.R.El Hassani

Strong Interaction Shift and Width of the 1s Level in Pionic Hydrogen

NUCLEAR REACTIONS ¹H(π^-, X), E at rest; measured pionic X-rays; deduced strong interaction shift, width.

ATOMIC PHYSICS, Mesic-Atoms ¹H(π^-, X), E at rest; measured pionic X-rays; deduced strong interaction shift, width.

doi: 10.1103/PhysRevLett.75.3245
Citations: PlumX Metrics

1994GO15      Nucl.Phys. A575, 673 (1994)

P.F.A.Goudsmit, H.J.Leisi, E.Matsinos, B.L.Birbrair, A.B.Gridnev

The Extended Tree-Level Model for the Pion-Nucleon Interaction

doi: 10.1016/0375-9474(94)90162-7
Citations: PlumX Metrics

1994GO45      Helv.Phys.Acta 67, 369 (1994)

P.F.A.Goudsmit, H.J.Leisi, E.Matsinos

The Low-Energy Pion-Nucleon Interaction

NUCLEAR REACTIONS ¹H(π⁺, π⁺), E ≈ 20-100 MeV; ¹H(π^-, π^-), E=29.4-97.9 MeV; analyzed σ(θ), σ(E), asymmetry data; ¹H(π^-, π⁰), E ≈ 20-100 MeV; analyzed σ(θ), σ(E) data. Low-energy π-nucleon interaction model.

1994JE10      Phys.Lett. 335B, 326 (1994)

B.Jeckelmann, P.F.A.Goudsmit, H.J.Leisi

The Mass of the Negative Pion

NUCLEAR REACTIONS ²⁴Mg(π^-, X), E at rest; measured K X-ray transition probabilities; deduced m(π), m(ν(μ)).

ATOMIC PHYSICS, Mesic-Atoms ²⁴Mg(π^-, X), E at rest; measured K X-ray transition probabilities; deduced m(π), m(ν(μ)).

doi: 10.1016/0370-2693(94)90358-1
Citations: PlumX Metrics

1993BA75      Nucl.Instrum.Methods Phys.Res. A335, 470 (1993)

A.Badertscher, M.Bogdan, P.F.A.Goudsmit, L.Knecht, H.J.Leisi, H.Ch.Schroder, D.Sigg, Z.G.Zhao, D.Chatellard, J.-P.Egger, E.Jeannet, E.C.Aschenauer, K.Gabathuler, L.M.Simons, A.J.R.El-Hassani

A High Resolution Reflecting Crystal Spectrometer to Measure 3 keV Pionic Hydrogen and Deuterium X-Rays

NUCLEAR REACTIONS ⁹Be(π^-, X), E at rest; measured pionic X-ray spectra. High resolution crystal spectrometer.

ATOMIC PHYSICS, Mesic-Atoms ⁹Be(π^-, X), E at rest; measured pionic X-ray spectra. High resolution crystal spectrometer.

doi: 10.1016/0168-9002(93)91232-C
Citations: PlumX Metrics

1992GO30      Helv.Phys.Acta 65, 878 (1992)

P.F.A.Goudsmit, H.J.Leisi, E.Matsinos

A New Pion-Nucleon Interaction Model

NUCLEAR REACTIONS ¹n, ¹H(π, π), E ≤ 150 MeV; analyzed phase shifts data; deduced model parameters energy dependence. New pion-nucleon interaction model.

1991BE29      Phys.Lett. 261B, 16 (1991)

W.Beer, M.Bogdan, P.F.A.Goudsmit, H.J.Leisi, A.J.R.El-Hassani, D.Sigg, St.Thomann, W.Volken, D.Bovet, E.Bovet, D.Chatellard, J.-P.Egger, G.Fiorucci, K.Gabathuler, L.M.Simons

Determination of the Strong Interaction Shift in Pionic Hydrogen with a High Resolution Crystal Spectrometer System

NUCLEAR REACTIONS ¹H(π^-, X), E at 85 MeV/c; measured pionic X-ray transition energy; deduced strong interaction shift. High resolution crystal spectrometer.

ATOMIC PHYSICS, Mesic-Atoms ¹H(π^-, X), E at 85 MeV/c; measured pionic X-ray transition energy; deduced strong interaction shift. High resolution crystal spectrometer.

doi: 10.1016/0370-2693(91)91317-O
Citations: PlumX Metrics

1991GO21      Phys.Lett. 271B, 290 (1991)

P.F.A.Goudsmit, H.J.Leisi, E.Matsinos

Pionic Atoms, the Relativistic Mean-Field Theory and the Pion-Nucleon Scattering Lengths

NUCLEAR STRUCTURE ⁶Li, ²⁰N, ¹²C, ⁴⁰Ca; analyzed pionic level shift data; deduced pseudoscalar πNN mixing parameter. Relativistic mean field theory.

ATOMIC PHYSICS, Mesic-Atoms ⁶Li, ²⁰N, ¹²C, ⁴⁰Ca; analyzed pionic level shift data; deduced pseudoscalar πNN mixing parameter. Relativistic mean field theory.

doi: 10.1016/0370-2693(91)90089-9
Citations: PlumX Metrics

1988BO12      Helv.Phys.Acta 61, 219 (1988)

D.Bovet, E.Bovet, J.P.Egger, G.Fiorucci, J.L.Vuilleumier, W.Beer, J.F.Gilot, P.F.A.Goudsmit, H.J.Leisi, A.Rusi el Hassani, K.Gabathuler, L.Simons

Mesure du Deplacement et de l'Elargissement d'Interaction Forte du Niveau 1S de l'Hydrogene Pionique

ATOMIC PHYSICS, Mesic-Atoms ¹H(π, X), E not given; measured X-ray spectra. High resolution, low energy spectrometer.

1988EL06      Helv.Phys.Acta 61, 1130 (1988)

A.J.R.El-Hassani, J.-F.Gilot, P.F.A.Goudsmit, H.J.Leisi, St.Thomann

On the s-Wave Repulsion of the Pion-Nuclear Interaction

ATOMIC PHYSICS, Mesic-Atoms ¹²C, ¹⁶O, ²⁰Ne; calculated 1s level shifts; deduced model validities.

1987GI01      Phys.Lett. 186B, 9 (1987)

K.L.Giovanetti, G.de Chambrier, P.F.A.Goudsmit, H.J.Leisi, B.Jeckelmann, Th.Karapiperis

The Isoscalar Pion-Nucleus Interaction from Pionic Atoms

ATOMIC PHYSICS, Mesic-Atoms ⁴He, ¹²C, ¹⁶O, ²⁰Ne; analyzed pionic atom data; deduced improved optical potential.

doi: 10.1016/0370-2693(87)90503-X
Citations: PlumX Metrics

1986BE04      Nucl.Phys. A451, 679 (1986)

I.Beltrami, B.Aas, W.Beer, G.De Chambrier, P.F.A.Goudsmit, Th.v.Ledebur, H.J.Leisi, W.Ruckstuhl, W.W.Sapp, G.Strassner, A.Vacchi, U.Kiebele, J.-A.Pinston, R.Weber

New Precision Measurements of the Muonic 3d(5/2)-2p(3/2) X-Ray Transition in ²⁴Mg and ²⁸Si: Vacuum polarisation test and search for muon-hadron interactions beyond QED

ATOMIC PHYSICS, Mesic-Atoms ²⁴Mg, ²⁸Si; measured muonic X-rays, transition wavelengths; deduced muon-nucleon interaction limits, vacuum polarisation effect, muon mass.

doi: 10.1016/0375-9474(86)90299-X
Citations: PlumX Metrics

1986GO04      Helv.Phys.Acta 59, 186 (1986)

P.F.A.Goudsmit, G.de Chambrier, K.l.Giovanetti, B.Jeckelmann, H.J.Leisi, A.Ruetschi

Anomaly in Pion Absorption

ATOMIC PHYSICS, Mesic-Atoms Z=2-14; analyzed pionic atom data. Improved optical model.

1986JE02      Nucl.Phys. A457, 709 (1986)

B.Jeckelmann, W.Beer, G.De Chambrier, O.Elsenhans, K.L.Giovanetti, P.F.A.Goudsmit, H.J.Leisi, T.Nakada, O.Piller, A.Ruetschi, W.Schwitz

New Precision Determination of the π^- Mass from Pionic X-Rays

ATOMIC PHYSICS, Mesic-Atoms ²⁴Mg; measured pionic transition wavelength, X-rays; deduced π^- mass, limit on muon-neutrino mass, electronic K-shell population.

doi: 10.1016/0375-9474(86)90476-8
Citations: PlumX Metrics

1986JE03      Helv.Phys.Acta 59, 1184 (1986)

B.Jeckelmann, W.Beer, G.de Chambrier, O.Elsenhans, K.L.Giovanetti, P.F.A.Goudsmit, H.J.Leisi, T.Nakada, O.Piller, W.Schwitz

Neue Prazisionsmessung der π^--Masse

ATOMIC PHYSICS, Mesic-Atoms ²⁴Mg(π^-, X), E not given; measured pionic X-rays; deduced pion mass.

1985BE53      Nucl.Instrum.Methods 238, 365 (1985)

W.Beer, K.Bos, G.De Chambrier, K.L.Giovanetti, P.F.A.Goudsmit, B.V.Grigoryev, B.Jeckelmann, L.Knecht, L.N.Kondurova, J.Langhans, H.J.Leisi, P.M.Levchenko, V.I.Marushenko, A.F.Mezentsev, H.Obermeier, A.A.Petrunin, U.Rohrer, A.G.Sergeev, S.G.Skornjakov, A.I.Smirnov, E.Steiner, G.Strassner, V.M.Suvorov, A.Vacchi

Crystal Spectrometer for Measurements of Pionic X-Rays

NUCLEAR REACTIONS ^24,25,26Mg, Si, ³⁰Si, O, C(π, X), E at rest; measured pionic X-rays. Bent crystal spectrometer, high precision laser interferometer system.

ATOMIC PHYSICS, Mesic-Atoms Mg, Si, C, O; measured pionic X-rays; deduced wave length ratios. Bent crystal spectrometer, high precision laser interferometer system.

doi: 10.1016/0168-9002(85)90474-7
Citations: PlumX Metrics

1985DE34      Nucl.Phys. A442, 637 (1985)

G.de Chambrier, W.Beer, F.W.N.de Boer, K.Bos, A.I.Egorov, M.Eckhause, K.L.Giovanetti, P.F.A.Goudsmit, B.Jeckelmann, K.E.Kiryanov, L.N.Kondurova, L.Lapina, H.J.Leisi, V.I.Marushenko, A.F.Mezentsev, A.A.Petrunin, A.G.Sergeev, A.I.Smirnov, G.Strassner, V.M.Suvorov, A.Vacchi, D.Wieser

Precision Measurement of the Wavelengths and Natural Line of 3d-2p Pionic X-ray Transitions in Low-Z Atoms

ATOMIC PHYSICS, Mesic-Atoms ¹²C, ^16,18O, ^24,26Mg, ^28,30Si; measured pionic transmission wave lengths, X-rays; deduced 2p state strong interaction shifts, widths.

doi: 10.1016/0375-9474(85)90370-7
Citations: PlumX Metrics

1985DE42      Nucl.Phys. A444, 589 (1985)

F.W.N.De Boer, B.Aas, P.Baertschi, W.Beer, I.Beltrami, K.Bos, P.F.A.Goudsmit, U.Kiebele, B.Jeckelmann, H.J.Leisi, W.Ruckstuhl, G.Strassner, A.Vacchi, R.Weber

Precision Measurement of the 2p-1s Transition Wavelength in Muonic ¹³C

ATOMIC PHYSICS, Mesic-Atoms ¹³C; measured muonic X-rays, transition wavelength; deduced muon-nucleon interaction limits, ^12,13C isotope shift. ¹³C deduced rms charge radius. Bent crystal spectrometer.

NUCLEAR REACTIONS ¹³C(μ^-, X), E at rest; measured X-rays; deduced muon-nucleon interaction limits, ^12,13C isotope shift. ¹³C deduced rms charge radius. Bent crystal spectrometer.

doi: 10.1016/0375-9474(85)90106-X
Citations: PlumX Metrics

1985JE05      Nucl.Instrum.Methods 241, 191 (1985)

B.Jeckelmann, W.Beer, G.De Chambrier, O.Elsenhans, K.L.Giovanetti, P.F.A.Goudsmit, H.J.Leisi, A.Ruetschi

A New Determination of the 25.7 keV Wavelength Standard in the Decay of ¹⁶¹Tb

RADIOACTIVITY ¹⁶¹Tb(β^-) [from ¹⁶⁰Gd(n, γ)¹⁶¹Gd(β^--decay)]; ¹⁷⁰Tm(β^-) [from ¹⁶⁹Tm(n, γ), E=thermal]; ¹⁸²Ta(β^-) [from ¹⁸¹Ta(n, γ), E=thermal]; measured Eγ, Iγ; deduced 25.7 keV wavelength standard. ¹⁶¹Dy, ¹⁸²W deduced transition energy. High precision crystal spectrometer.

doi: 10.1016/0168-9002(85)90532-7
Citations: PlumX Metrics

1985RU01      Nucl.Phys. A433, 634 (1985)

W.Ruckstuhl, B.Aas, W.Beer, I.Beltrami, K.Bos, G.De Chambrier, P.F.A.Goudsmit, H.J.Leisi, G.Strassner, A.Vacchi, J.M.Van Der Velden, B.Jeckelmann, U.Kiebele, R.Weber

Measurement of the Hyperfine Splitting of the 1s State in Muonic ⁷Li as a Search for Axial-Vector Muon-Nucleon Interactions

ATOMIC PHYSICS, Mesic-Atoms ⁷Li; measured muonic hfs; deduced 2p-1s transition strength. High precision bent crystal spectrometer.

NUCLEAR MOMENTS ⁷Li; measured muonic hfs; deduced axial vector boson mediated muon-nucleon interaction strength upper limit. High precision bent crystal spectrometer.

doi: 10.1016/0375-9474(85)90022-3
Citations: PlumX Metrics

1984AA02      Helv.Phys.Acta 57, 291 (1984)

B.Aas, W.Beer, I.Beltrami, K.Bos, P.F.A.Goudsmit, H.J.Leisi, W.Ruckstuhl, G.Strassner, A.Vacchi, F.W.N.de Boer, U.Kiebele, R.Weber

Prazisionsmessung der Wellenlange des 2p-1s Ueberganges im Muonischen ¹³C

ATOMIC PHYSICS, Mesic-Atoms ¹³C; measured 2P-1S transition wave length.

1984BE45      Nucl.Phys. A429, 381 (1984)

I.Beltrami, B.Aas, W.Beer, P.Ebersold, R.Eichler, P.F.A.Goudsmit, M.Guanziroli, Th.v.Ledebur, H.J.Leisi, W.Ruckstuhl, W.W.Sapp, G.Strassner, A.Vacchi, U.Kiebele, R.Weber

The Electron Screening Effect in Muonic ²⁸Si

ATOMIC PHYSICS, Mesic-Atoms ²⁸Si; measured muonic X-rays; deduced transition energies, electron screening effect, muon cascade.

doi: 10.1016/0375-9474(84)90687-0
Citations: PlumX Metrics

1984DE49      Nucl.Instrum.Methods 227, 512 (1984)

G.De Chambrier, B.Aas, W.Beer, I.Beltrami, Th.v.Ledebur, H.J.Leisi, W.Ruckstuhl, G.Strassner, A.Vacchi, U.Kiebele, R.Weber

Precision Measurements of γ-Rays in the Decay of ¹⁶¹Tb

RADIOACTIVITY ¹⁶¹Tb(β^-); measured Eγ, transition wavelength. High precision, curved crystal spectrometer.

doi: 10.1016/0168-9002(84)90209-2
Citations: PlumX Metrics

1984RU12      Nucl.Phys. A430, 685 (1984)

W.Ruckstuhl, B.Aas, W.Beer, I.Beltrami, K.Bos, P.F.A.Goudsmit, H.J.Leisi, G.Strassner, A.Vacchi, F.W.N.De Boer, U.Kiebele, R.Weber

Precision Measurement of the 2p-1s Transition in Muonic ¹²C: Search for new muon-nucleon interactions or accurate determination of the rms nuclear charge radius

ATOMIC PHYSICS, Mesic-Atoms ¹²C; measured muonic transition wavelength; deduced muon-nucleon interaction nature. ¹²C deduced rms charge radius. Crystal spectrometer.

doi: 10.1016/0375-9474(84)90101-5
Citations: PlumX Metrics

1983JE09      Nucl.Phys. A408, 495 (1983)

B.Jeckelmann, W.Beer, I.Beltrami, F.W.N.De Boer, G.De Chambrier, P.F.A.Goudsmit, J.Kern, H.J.Leisi, W.Ruckstuhl, A.Vacchi

Spectroscopic Quadrupole Moment of ²³Na from Muonic X-Rays

NUCLEAR REACTIONS ²³Na(μ^-, X), E at rest; measured X-ray spectra. ²³Na deduced quadrupole moment.

ATOMIC PHYSICS, Mesic-atoms ²³Na(μ^-, X), E at rest; measured X-ray spectra. ²³Na deduced quadrupole moment.

doi: 10.1016/0375-9474(83)90242-7
Citations: PlumX Metrics

1982AA01      Nucl.Phys. A375, 405 (1982)

B.Aas, W.Beer, I.Beltrami, P.Ebersold, R.Eichler, Th.V.Ledebur, H.J.Leisi, W.Ruckstuhl, W.W.Sapp, A.Vacchi, J.Kern, J.-A.Pinston, W.Schwitz, R.Weber

Vacuum Polarization Test and Search for Muon-Hadron Interactions from Muonic X-Rays: Crystal-spectrometer experiments

ATOMIC PHYSICS, Mesic-Atoms ²⁴Mg, ²⁸Si, ³¹P; measured muonic X-rays, transition wave lengths; deduced vacuum polarization shift, muon-nucleon interaction limits, muon mass.

doi: 10.1016/0375-9474(82)90021-5
Citations: PlumX Metrics

1982AA02      Nucl.Phys. A375, 439 (1982)

B.Aas, R.Eichler, H.J.Leisi

Transition Wavelengths of Muonic X-Rays of Magnesium, Silicon and Phosphorus

ATOMIC PHYSICS, Mesic-Atoms ²⁴Mg, ²⁸Si, ³¹P; calculated muonic transition wavelengths. Quantum electrodynamics.

doi: 10.1016/0375-9474(82)90022-7
Citations: PlumX Metrics

1982RU06      Phys.Rev.Lett. 49, 859 (1982)

W.Ruckstuhl, B.Aas, W.Beer, I.Beltrami, F.W.N.de Boer, K.Bos, P.F.A.Goudsmit, U.Kiebele, H.J.Leisi, G.Strassner, A.Vacchi, R.Weber

High-Precision Muonic X-Ray Measurement of the rms Charge Radius of ¹²C with a Crystal Spectrometer

ATOMIC PHYSICS, Mesic-Atoms ¹²C; measured muonic X-rays. ¹²C deduced rms charge radius.

doi: 10.1103/PhysRevLett.49.859
Citations: PlumX Metrics

1982WE04      Nucl.Phys. A377, 361 (1982)

R.Weber, B.Jeckelmann, J.Kern, U.Kiebele, B.Aas, W.Beer, I.Beltrami, K.Bos, G.De Chambrier, P.F.A.Goudsmit, H.J.Leisi, W.Ruckstuhl, G.Strassner, A.Vacchi

Spectroscopic Quadrupole Moments of ²⁵Mg and ²⁷Al from Muonic X-Rays

NUCLEAR MOMENTS ²⁵Mg, ²⁷Al; measured muonic X-rays, hfs; deduced electric field gradient, Sternheimer factor. ²⁵Mg, ²⁷Al deduced spectroscopic quadrupole moment. Nuclear rotational model, strong-coupling limit.

doi: 10.1016/0375-9474(82)90046-X
Citations: PlumX Metrics

1981BE65      Helv.Phys.Acta 54, 643 (1981)

I.Beltrami, B.Aas, W.Beer, G.de Chambrier, P.F.A.Goudsmit, Th.v.Ledebur, H.J.Leisi, W.Ruckstuhl, W.W.Sapp, G.Strassner, A.Vacchi

Prazisionsmessungen der (3d-2p)-Rontgenubergange in Myonischem ²⁸Si und ²⁴Mg

ATOMIC PHYSICS, Mesic-Atoms ²⁸Si, ²⁴Mg; measured muonic X-rays. Crystal spectrometer, high precision.

1981JE02      Helv.Phys.Acta 54, 321 (1981)

B.Jeckelmann, J.Kern, U.Kiebele, J.-A.Pinston, R.Weber, B.Aas, W.Beer, I.Beltrami, K.Bos, G.deChambrier, P.F.A.Goudsmit, Th.V.Ledebur, H.J.Leisi, W.Ruckstuhl, G.Strassner, A.Vacchi

Spektroskopische Quadrupolmomente von ²⁵Mg und ²⁷Al aus Muonischen X-Ray Ubergangen

NUCLEAR MOMENTS ²⁵Mg, ²⁷Al; measured hfs, muonic X-rays; deduced spectroscopic quadrupole moments.

1981RU12      Helv.Phys.Acta 54, 644 (1981)

W.Ruckstuhl, B.Aas, W.Beer, I.Beltrami, K.Bos, P.F.A.Goudsmit, H.J.Leisi, G.Strassner, A.Vacchi, R.Weber, J.M.v.d.Velden

Die Hyperfeinaufspaltung des 1s-Zustandes in μ - ⁷Li als Test der Wechselwirkung Zwischen Myonen und Nukleonen

NUCLEAR MOMENTS ⁷Li; measured muonic X-rays, hfs; deduced muon-nucleon axial vector interaction.

1981RU13      Helv.Phys.Acta 54, 644 (1981)

W.Ruckstuhl, B.Aas, I.Beltrami, K.Bongardt, P.F.A.Goudsmit, H.J.Leisi, G.Strassner, A.Vacchi, F.W.N.De Boer, U.Kiebele, R.Weber

Bestimmung des Ladungsradius von ¹²C aus einer Messung des Myonischen (2p-1s)-Rontgenubergangs

NUCLEAR MOMENTS ¹²C; measured muonic X-rays; deduced rms radius. Crystal spectrometer.

1981WE01      Phys.Lett. 98B, 343 (1981)

R.Weber, J.Kern, U.Kiebele, J.-A.Pinston, B.Aas, I.Beltrami, Th.Bernold, K.Bongardt, Th.V.Ledebur, H.J.Leisi, W.Ruckstuhl, G.Strassner, A.Vacchi

Spectroscopic Quadrupole Moment of ²⁷Al from Muonic X-Rays

NUCLEAR MOMENTS ²⁷Al; measured muonic X-rays, hfs. ²⁷Al level deduced quadrupole moment. Bent crystal spectrometer.

doi: 10.1016/0370-2693(81)90921-7
Citations: PlumX Metrics

1979AA02      Nucl.Phys. A329, 450 (1979)

B.Aas, W.Beer, I.Beltrami, K.Bongardt, P.Ebersold, R.Eichler, Th. V. Ledebur, H.J.Leisi, W.W.Sapp, J.-A.Pinston, J.Kern, R.Lanners, W.Schwitz

Crystal-Spectrometer Measurement of the 3d-2p X-Ray Transition in Muonic ³¹P

ATOMIC PHYSICS, Mesic-Atoms ³¹P; measured wavelength of 3d-2p muonic X-ray transition; deduced muon-hadron anomalous interaction limit.

doi: 10.1016/0375-9474(79)90386-5
Citations: PlumX Metrics

1979DE29      Nucl.Phys. A326, 418 (1979)

W.Dey, P.Ebersold, H.J.Leisi, F.Scheck, H.K.Walter, A.Zehnder

Nuclear Spectroscopic Ground-State Quadrupole Moments from Muonic Atoms: The Quadrupole Moment of ¹⁷⁵Lu

NUCLEAR MOMENTS ¹⁷⁵Lu; measured muonic X-rays; deduced quadrupole, hexa-decapole moment, Stenheimer factor. Rigid rotor model.

doi: 10.1016/0375-9474(79)90401-9
Citations: PlumX Metrics

1978EB01      Nucl.Phys. A296, 493 (1978)

P.Ebersold, B.Aas, W.Dey, R.Eichler, H.J.Leisi, W.W.Sapp, F.Scheck

Monopole and Quadrupole Strong Interaction Effects in Pionic Atoms of ¹⁷⁵Lu and ¹⁶⁵Ho

NUCLEAR MOMENTS ¹⁶⁵Ho; measured quadrupole moment. Generalized moments of neutron distribution.

ATOMIC PHYSICS, Mesic-Atoms ¹⁷⁵Lu, ¹⁶⁵Ho(π^-, X-ray); measured pionic X-rays; deduced monopole, quadrupole interactions, strong-interaction contribution.

doi: 10.1016/0375-9474(78)90087-8
Citations: PlumX Metrics

1975EB06      Phys.Lett. 58B, 428 (1975)

P.Ebersold, B.Aas, W.Dey, R.Eichler, H.J.Leisi, W.W.Sapp, H.K.Walter

Observation of Nuclear Rotational Spectra in Pion Capture on ¹⁶⁵Ho and ¹⁷⁵Lu

NUCLEAR REACTIONS ¹⁶⁵Ho, ¹⁷⁵Lu(π^-, xn), X=1, 3, 5, 7, 9, 11, E ≈ 0; measured Eγ, Iγ/pion capture. ^{154,156,158,160,162,164}Dy deduced transitions.

doi: 10.1016/0370-2693(75)90580-8
Citations: PlumX Metrics

1974EB03      Phys.Lett. 53B, 48 (1974)

P.Ebersold, B.Aas, W.Dey, R.Eichler, J.Hartmann, H.J.Leisi, W.W.Sapp

Spectroscopic Quadrupole Moment of Holmium from Pionic X-Ray Measurement

NUCLEAR MOMENTS, Mesic-Atoms ¹⁶⁵Ho; measured E(X-ray) in pionic Ho; deduced quadrupole moment.

doi: 10.1016/0370-2693(74)90340-2
Citations: PlumX Metrics

1970GY01      Phys.Lett. 32B, 359 (1970)

F.N.Gygax, R.F.Jenefsky, H.J.Leisi

Unperturbed Angular Correlation from a Low-Density Gaseous Source

RADIOACTIVITY ^129mXe; measured γγ(θ), ICC. ¹²⁹Xe level deduced J.

doi: 10.1016/0370-2693(70)90496-X
Citations: PlumX Metrics

1970LE16      Phys.Rev. A1, 1654 (1970)

H.J.Leisi

Hyperfine Interaction Induced by Electron Capture. I. γ-γ Directional-Correlation Experiments

RADIOACTIVITY ^125,127Xe; measured γγ(θ, H); deduced EC-induced hyperfine interaction.

doi: 10.1103/PhysRevA.1.1654
Citations: PlumX Metrics

1966LE09      Nucl.Phys. 76, 308 (1966)

H.J.Leisi

Angular Correlations in the Decay of ¹²⁷Xe

RADIOACTIVITY ¹²⁷Xe[from ¹²⁶Xe(n, γ), ¹²⁷I(p, n)]; measured γγ(θ); deduced attenuation. ¹²⁷I levels deduced J. Enriched targets.

doi: 10.1016/0029-5582(66)90025-3
Citations: PlumX Metrics

1965LE14      Phys.Letters 17, 308 (1965)

H.J.Leisi

Resonance Peak in Perturbed Gamma-Gamma Angular Correlations

NUCLEAR STRUCTURE ¹²⁷Xe; measured not abstracted; deduced nuclear properties.

doi: 10.1016/0031-9163(65)90543-3
Citations: PlumX Metrics

1964LE13      Phys.Letters 12, 221 (1964)

H.J.Leisi

K-Capture Effects on Angular Correlations in Gaseous Sources

NUCLEAR STRUCTURE ¹²⁵Xe, ¹²⁷Xe; measured not abstracted; deduced nuclear properties.

doi: 10.1016/0031-9163(64)91081-9
Citations: PlumX Metrics

1962PE04      Nuclear Phys. 31, 157 (1962)

C.F.Perdrisat, H.J.Leisi, J.H.Brunner

Mono-Energetic Positons in Bi²⁰⁵

NUCLEAR STRUCTURE ²⁰⁵Bi; measured not abstracted; deduced nuclear properties.

doi: 10.1016/0029-5582(62)90735-6
Citations: PlumX Metrics

1962PE08      Helv.Phys.Acta 35, 175 (1962)

C.F.Perdrisat, J.H.Brunner, H.J.Leisi

Etude des Spectres de Positrons des Desintegrations du Bi²⁰⁵ et du Bi²⁰⁶

NUCLEAR STRUCTURE ²⁰⁵Bi, ²⁰⁶Bi; measured not abstracted; deduced nuclear properties.

1961BR19      Helv.Phys.Acta 34, 472 (1961)

J.H.Brunner, R.Lombard, C.F.Perdrisat, H.J.Leisi

Spectres de Positrons dans les Desintegrations Bi²⁰⁵ → Pb²⁰⁵ et Bi²⁰⁶ → Pb²⁰⁶

NUCLEAR STRUCTURE ²⁰⁵Bi, ²⁰⁶Bi; measured not abstracted; deduced nuclear properties.

1961LE05      Helv.Phys.Acta 34, 161 (1961)

H.J.Leisi, J.H.Brunner, C.F.Perdrisat, P.Scherrer

Monoenergetische Positronen

NUCLEAR STRUCTURE ²⁰⁶Bi; measured not abstracted; deduced nuclear properties.

1959BR10      Phys.Rev.Letters 2, 207 (1959)

J.H.Brunner, H.J.Leisi, C.F.Perdrisat, P.Scherrer

Monoenergetic Positrons in the Decay of Bi²⁰⁶

doi: 10.1103/PhysRevLett.2.207
Citations: PlumX Metrics

1956BR04      Helv.Phys.Acta 29, 238 (1956)

J.Brunner, J.Halter, H.J.Leisi

Die Konversionsspektren hoher Energie von Hg¹⁹⁵ und Hg¹⁹³

1955BR12      Helv.Phys.Acta 28, 475 (1955)

J.Brunner, H.Guhl, J.Halter, H.J.Leisi

Zum Zerfall von Hg¹⁹⁵, Hg¹⁹⁴, und Hg¹⁹³