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NSR database version of April 11, 2024.

Search: Author = A.Knecht

Found 17 matches.

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2023AD02      Eur.Phys.J. A 59, 15 (2023)

A.Adamczak, A.Antognini, N.Berger, T.E.Cocolios, N.Deokar, Ch.E.Dullmann, A.Eggenberger, R.Eichler, M.Heines, H.Hess, P.Indelicato, K.Kirch, A.Knecht, J.J.Krauth, J.Nuber, A.Ouf, A.Papa, R.Pohl, E.Rapisarda, P.Reiter, N.Ritjoho, S.Roccia, M.Seidlitz, N.Severijns, K.von Schoeler, A.Skawran, S.M.Vogiatzi, N.Warr and F.Wauters

Muonic atom spectroscopy with microgram target material

doi: 10.1140/epja/s10050-023-00930-y
Citations: PlumX Metrics


2022MU16      Phys.Rev.Lett. 129, 182502 (2022)

P.Muller, Y.Bagdasarova, R.Hong, A.Leredde, K.G.Bailey, X.Flechard, A.Garcia, B.Graner, A.Knecht, O.Naviliat-Cuncic, T.P.O'Connor, M.G.Sternberg, D.W.Storm, H.E.Swanson, F.Wauters, D.W.Zumwalt

β-Nuclear-Recoil Correlation from 6He Decay in a Laser Trap

RADIOACTIVITY 6He(β-); measured decay products, Eβ, Iβ; deduced yields, exotic tensor-type contributions to the charged weak current. Comparison with systematics.

doi: 10.1103/PhysRevLett.129.182502
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2021KR03      Nature(London) 589, 527 (2021)

J.J.Krauth, K.Schuhmann, M.A.Ahmed, F.D.Amaro, P.Amaro, F.Biraben, T.-L.Chen, D.S.Covita, A.J.Dax, M.Diepold, L.M.P.Fernandes, B.Franke, S.Galtier, A.L.Gouvea, J.Gotzfried, T.Graf, T.W.Hansch, J.Hartmann, M.Hildebrandt, P.Indelicato, L.Julien, K.Kirch, A.Knecht, Y.-W.Liu, J.Machado, C.M.B.Monteiro, F.Mulhauser, B.Naar, T.Nebel, F.Nez, J.M.F.dos Santos, J.P.Santos, C.I.Szabo, D.Taqqu, J.F.C.A.Veloso, J.Vogelsang, A.Voss, B.Weichelt, R.Pohl, A.Antognini, F.Kottmann

Measuring the α-particle charge radius with muonic helium-4 ions

ATOMIC PHYSICS 4He; measured frequencies; deduced resonances, isotope shifts, 2S-2P transitions in the muonic helium-4 ion that yields a precise determination of the root-mean-square charge radius of the α particle. Comparison with available data.

doi: 10.1038/s41586-021-03183-1
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Data from this article have been entered in the XUNDL database. For more information, click here.


2020AB02      Phys.Rev.Lett. 124, 081803 (2020)

C.Abel, S.Afach, N.J.Ayres, C.A.Baker, G.Ban, G.Bison, K.Bodek, V.Bondar, M.Burghoff, E.Chanel, Z.Chowdhuri, P.-J.Chiu, B.Clement, C.B.Crawford, M.Daum, S.Emmenegger, L.Ferraris-Bouchez, M.Fertl, P.Flaux, B.Franke, A.Fratangelo, P.Geltenbort, K.Green, W.C.Griffith, M.van der Grinten, Z.D.Grujic, P.G.Harris, L.Hayen, W.Heil, R.Henneck, V.Helaine, N.Hild, Z.Hodge, M.Horras, P.Iaydjiev, S.N.Ivanov, M.Kasprzak, Y.Kermaidic, K.Kirch, A.Knecht, P.Knowles, H.-C.Koch, P.A.Koss, S.Komposch, A.Kozela, A.Kraft, J.Krempel, M.Kuzniak, B.Lauss, T.Lefort, Y.Lemiere, A.Leredde, P.Mohanmurthy, A.Mtchedlishvili, M.Musgrave, O.Naviliat-Cuncic, D.Pais, F.M.Piegsa, E.Pierre, G.Pignol, C.Plonka-Spehr, P.N.Prashanth, G.Quemener, M.Rawlik, D.Rebreyend, I.Rienacker, D.Ries, S.Roccia, G.Rogel, D.Rozpedzik, A.Schnabel, P.Schmidt-Wellenburg, N.Severijns, D.Shiers, R.Tavakoli Dinani, J.A.Thorne, R.Virot, J.Voigt, A.Weis, E.Wursten, G.Wyszynski, J.Zejma, J.Zenner, G.Zsigmond

Measurement of the Permanent Electric Dipole Moment of the Neutron

NUCLEAR MOMENTS 1NN; measured frequencies; deduced the electric dipole moment (EDM) of the neutron or its upper limit.

doi: 10.1103/PhysRevLett.124.081803
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2020AN04      Phys.Rev. C 101, 054313 (2020)

A.Antognini, N.Berger, T.E.Cocolios, R.Dressler, R.Eichler, A.Eggenberger, P.Indelicato, K.Jungmann, C.H.Keitel, K.Kirch, A.Knecht, N.Michel, J.Nuber, N.S.Oreshkina, A.Ouf, A.Papa, R.Pohl, M.Pospelov, E.Rapisarda, N.Ritjoho, S.Roccia, N.Severijns, A.Skawran, S.M.Vogiatzi, F.Wauters, L.Willmann

Measurement of the quadrupole moment of 185Re and 187Re from the hyperfine structure of muonic X rays

ATOMIC PHYSICS 185,187Re, 208Pb(μ-, μ-'), E at 29 MeV/c, [negative muon beam from the decay of pions produced in C(p, π), E=590 MeV]; measured Eγ, Iγ, energy and intensities of muonic x-rays using two HPGe detectors at the HIPA facility of Paul Scherrer Institut; deduced hyperfine splitting of the 5g to 4f muonic atom transitions, and compared to state-of-the-art atomic theoretical predictions; extracted spectroscopic quadrupole moments for ground states of 185Re and 187Re.

NUCLEAR MOMENTS 185,187Re; measured muonic atom hyperfine structure; deduced spectroscopic quadrupole moments of ground states. Comparison with previous experimental measurement using natural Re target, and with theoretical predictions.

doi: 10.1103/PhysRevC.101.054313
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Data from this article have been entered in the XUNDL database. For more information, click here.


2017HO25      Phys.Rev. A 96, 053411 (2017)

R.Hong, A.Leredde, Y.Bagdasarova, X.Flechard, A.Garcia, A.Knecht, P.Muller, O.Naviliat-Cuncic, J.Pedersen, E.Smith, M.Sternberg, D.W.Storm, H.E.Swanson, F.Wauters, D.Zumwalt

Charge-state distribution of Li ions from the β decay of laser-trapped 6He atoms

RADIOACTIVITY 6He(β-) [from 6Li(d, t), E=18 MeV]; measured Eβ, Iβ, TOF; deduced 6Li ion charge fractions. Comparison with available data.

doi: 10.1103/PhysRevA.96.053411
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2016FI09      Eur.Phys.J. A 52, 206 (2016)

P.Finlay, M.Breitenfeldt, T.Porobic, E.Wursten, G.Ban, M.Beck, C.Couratin, X.Fabian, X.Flechard, P.Friedag, P.Friedag, F.Gluck, A.Herlert, A.Knecht, V.Y.Kozlov, E.Lienard, G.Soti, M.Tandecki, E.Traykov, S.Van Gorp, Ch.Weinheimer, D.Zakoucky, N.Severijns

First high-statistics and high-resolution recoil-ion data from the WITCH retardation spectrometer

doi: 10.1140/epja/i2016-16206-y
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2014AF03      Phys.Lett. B 739, 128 (2014)

S.Afach, C.A.Baker, G.Ban, G.Bison, K.Bodek, M.Burghoff, Z.Chowdhuri, M.Daum, M.Fertl, B.Franke, P.Geltenbort, K.Green, M.G.D.van der Grinten, Z.Grujic, P.G.Harris, W.Heil, V.Helaine, R.Henneck, M.Horras, P.Iaydjiev, S.N.Ivanov, M.Kasprzak, Y.Kermaidic, K.Kirch, A.Knecht, H-C.Koch, J.Krempel, M.Kuzniak, B.Lauss, T.Lefort, Y.Lemieree, A.Mtchedlishvili, O.Naviliat-Cuncic, J.M.Pendlebury, M.Perkowski, E.Pierre, F.M.Piegsa, G.Pignol

A measurement of the neutron to 199Hg magnetic moment ratio

NUCLEAR MOMENTS 199Hg; measured frequency ratios; deduced neutron to mercury gyromagnetic ratio. Ultracold neutrons and mercury atoms stored in the same apparatus.

doi: 10.1016/j.physletb.2014.10.046
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2014SO16      Phys.Rev. C 90, 035502 (2014)

G.Soti, F.Wauters, M.Breitenfeldt, P.Finlay, P.Herzog, A.Knecht, U.Koster, I.S.Kraev, T.Porobic, P.N.Prashanth, I.S.Towner, C.Tramm, D.Zakoucky, N.Severijns

Measurement of the β-asymmetry parameter of 67Cu in search for tensor-type currents in the weak interaction

RADIOACTIVITY 67,68,68mCu(β-)[from U(p, X), E=1.4 GeV, followed by fragment separation by RILIS and GPS at CERN-ISOLDE]; measured Eβ, Iβ, β(θ, H, temp) by using nuclear implantation into Cold On-Line Equipment (NICOLE) 3He-4He dilution refrigerator; deduced β-asymmetry parameter for 67Cu decay and constraints on tensor coupling constants, nuclear matrix elements. Technique of LTNO used in combination with GEANT4-based Monte Carlo simulations. Comparisons with previous experimental measurements, and with predictions of standard model.

doi: 10.1103/PhysRevC.90.035502
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2012KN01      Phys.Rev.Lett. 108, 122502 (2012)

A.Knecht, R.Hong, D.W.Zumwalt, B.G.Delbridge, A.Garcia, P.Muller, H.E.Swanson, I.S.Towner, S.Utsuno, W.Williams, C.Wrede

Precision Measurement of the 6He Half-Life and the Weak Axial Current in Nuclei

RADIOACTIVITY 6He(β-) [from 7Li(d, 3He)6He, E=5.8 MeV]; measured decay products, Eβ, Iβ; deduced T1/2, log ft, Gamow-Teller matrix element. Comparison with ab initio calculations.

doi: 10.1103/PhysRevLett.108.122502
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Data from this article have been entered in the XUNDL database. For more information, click here.


2012KN02      Phys.Rev. C 86, 035506 (2012)

A.Knecht, R.Hong, D.W.Zumwalt, B.G.Delbridge, A.Garcia, P.Muller, H.E.Swanson, I.S.Towner, S.Utsuno, W.Williams, C.Wrede

Precision measurement of the 6He half-life and the weak axial current in nuclei

RADIOACTIVITY 6He[from 7Li(d, 3He), E=18 MeV](β-); measured Iβ, ββ-coin, T1/2; deduced ft value, Gamow-Teller matrix element. Comparison with ab-initio calculations, and with previous half-life measurements.

doi: 10.1103/PhysRevC.86.035506
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Data from this article have been entered in the XUNDL database. For more information, click here.


2011AT02      Europhys.Lett. 95, 12001 (2011)

F.Atchison, B.Blau, K.Bodek, B.van den Brandt, T.Brys, M.Daum, P.Fierlinger, P.Geltenbort, P.Hautle, R.Henneck, S.Heule, A.Holley, M.Kasprzak, K.Kirch, A.Knecht, J.A.Konter, M.Kuzniak, C.-Y.Liu, A.Pichlmaier, C.Plonka, Y.Pokotilovski, A.Saunders, D.Tortorella, M.Wohlmuther, A.R.Young, J.Zejma, G.Zsigmond

Production of ultracold neutrons from cryogenic 2H2, O2, and C2H4 converters

NUCLEAR REACTIONS 1,2H, C, O(n, n'), E<0.0253 eV; measured En, In, TOF; deduced yields, production rates of ultracold neutrons. Comparison with GEANT4 UCN-Monte Carlo code.

doi: 10.1209/0295-5075/95/12001
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2011FR04      Phys.Rev. C 83, 048801 (2011)

B.M.Freeman, C.Wrede, B.G.Delbridge, A.Garca, A.Knecht, A.Parikh, A.L.Sallaska

Branches of 33S( p, γ )34Cl at oxygen-neon nova temperatures

NUCLEAR REACTIONS 33S(p, γ), E=200-710 keV; measured Eγ, Iγ for 432-, 492-, and 529-keV resonances. Deduced stellar reaction rates. Production of sulfur isotopes and 34mCl in novae.

doi: 10.1103/PhysRevC.83.048801
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Data from this article have been entered in the XUNDL database. For more information, click here.


2010AL29      Nucl.Phys. A844, 47c (2010)

I.Altarev, G.Ban, G.Bison, K.Bodek, M.Burghoff, Z.Chowdhuri, M.Daum, C.Dusing, M.Fertl, P.Fierlinger, B.Franke, C.Grab, E.Gutsmiedl, G.Hampel, W.Heil, R.Henneck, M.Horras, N.Khomutov, K.Kirch, S.Kistryn, S.Knappe-Gruneberg, A.Knecht, P.Knowles, A.Kozela, A.Kraft, F.Kuchler, J.V.Kratz, T.Lauer, B.Lauss, T.Lefort, Y.Lemiere, A.Mtchedlishvili, O.Naviliat-Cuncic, G.Quemener, S.Paul, A.S.Pazgalev, G.Petzoldt, C.Plonka-Spehr, E.Pierre, G.Pignol, D.Rebreyend, S.Roccia, G.Rogel, P.Schmidt-Wellenburg, A.Schnabel, N.Severijns, Yu.Sobolev, R.Stoepler, A.Weis, N.Wiehl, J.Zejma, J.Zenner, G.Zsigmond

An improved measurement of the electric dipole moment of the neutron

doi: 10.1016/j.nuclphysa.2010.05.012
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2010AT02      Eur.Phys.J. A 44, 23 (2010)

F.Atchison, M.Daum, R.Henneck, S.Heule, M.Horisberger, M.Kasprzak, K.Kirch, A.Knecht, M.Kuzniak, B.Lauss, A.Mtchedlishvili, M.Meier, G.Petzoldt, C.Plonka-Spehr, R.Schelldorfer, U.Straumann, G.Zsigmond

Diffuse reflection of ultracold neutrons from low-roughness surfaces

doi: 10.1140/epja/i2010-10926-x
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2008AL31      Eur.Phys.J. A 37, 9 (2008)

I.Altarev, M.Daum, A.Frei, E.Gutsmiedl, G.Hampel, F.J.Hartmann, W.Heil, A.Knecht, J.V.Kratz, T.Lauer, M.Meier, S.Paul, U.Schmidt, Y.Sobolev, N.Wiehl, G.Zsigmond

Neutron velocity distribution from a superthermal solid 2H2 ultracold neutron source

NUCLEAR REACTIONS 2H(n, n'), E=thermal; measured ultracold neutron velocity distribution.

doi: 10.1140/epja/i2008-10604-8
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2007AT06      Phys.Rev.Lett. 99, 262502 (2007)

F.Atchison, B.Blau, K.Bodek, B.van den Brandt, T.Brys, M.Daum, P.Fierlinger, A.Frei, P.Geltenbort, P.Hautle, R.Henneck, S.Heule, A.Holley, M.Kasprzak, K.Kirch, A.Knecht, J.A.Konter, M.Kuzniak, C.-Y.Liu, C.L.Morris, A.Pichlmaier, C.Plonka, Y.Pokotilovski, A.Saunders, Y.Shin, D.Tortorella, M.Wohlmuther, A.R.Young, J.Zejma, G.Zsigmond

Cold Neutron Energy Dependent Production of Ultracold Neutrons in Solid Deuterium

NUCLEAR REACTIONS 2H(n, n), E=low; measured ultra cold neutron production cross sections.

doi: 10.1103/PhysRevLett.99.262502
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