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Search: Author = N.Severijns

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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
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2023FA07      Eur.Phys.J. A 59, 113 (2023)

A.Falkowski, M.Gonzalez-Alonso, O.Naviliat-Cuncic, N.Severijns

Superallowed decays within and beyond the standard model

doi: 10.1140/epja/s10050-023-01030-7
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2023SE01      Phys.Rev. C 107, 015502 (2023)

N.Severijns, L.Hayen, V.De Leebeeck, S.Vanlangendonck, K.Bodek, D.Rozpedzik, I.S.Towner

Ft values of the mirror β transitions and the weak-magnetism-induced current in allowed nuclear β decay

RADIOACTIVITY 1n, 3H(β-); 11C, 13N, 15O, 17F, 19Ne, 21Na, 23Mg, 25Al, 27Si, 29P, 31S, 33Cl, 35Ar, 37K, 39Ca, 41Sc, 43Ti, 45V, 47Cr, 49Mn, 51Fe, 53Co, 55Ni, 57Cu, 59Zn, 61Ga, 63Ge, 65As, 67Se, 69Br, 71Kr, 73Rb, 75Sr, 77Y, 79Zr, 81Nb, 83Mo, 85Tc, 89Rh, 91Pd, 93Ag, 95Cd, 97In, 99Sn(EC), (β+); analyzed and evaluated measured half-lives for decays of all the listed nuclei, and ground-state branching ratios for decays of 1n to 75Sr, T=1/2 mirror β decays; deduced adopted T1/2, ground-state branching ratios for decays of 1n to 83Mo, except 69Br, 73Rb and 81Nb. 1n, 3H(β-); 11C, 13N, 15O, 17F, 19Ne, 21Na, 23Mg, 25Al, 27Si, 29P, 31S, 33Cl, 35Ar, 37K, 39Ca, 41Sc, 43Ti, 45V, 47Cr, 49Mn, 51Fe, 53Co, 55Ni, 57Cu, 59Zn, 61Ga, 67Se, 71Kr, 75Sr(EC), (β+); calculated quantities and relevant corrections leading to the Ft values for mirror β transitions, and compared with available experimental values; comparison of experimental and theoretical values for the Gamow-Teller matrix element (MGT) and the orbital current matrix element (ML) for mirror β transitions from 1n to 45V decays. 6He, 9Li, 12,13B, 14,15C, 16N, 19O, 20F, 23Ne, 24,24mNa, 28Al, 32Si(β-); 9,10C, 12N, 13,14O, 18F, 18Ne, 20,22Na, 22Mg, 24,24mAl, 26Si, 28,30P, 30S, 32Cl, 34Ar, 36K, 38Ca, 42Ti, 53Ni(EC), (β+); analyzed logft values and other data for β transitions for T=1, 3/2 and 2 multiplet states for radiative corrections; comparison of the experimental values for the MGT and ML, and the form factors with the theoretical values calculated using shell model. 1n, 3H, 6He, 8,9Li, 12B, 16N, 20F, 23,24Ne, 24,24mNa(β-); 8Be, 9,10,11C, 12,13N, 15O, 17,18F, 18,19Ne, 20,21Na, 23Mg, 24,24m,25Al, 27Si, 29,30P, 30,31S, 33Cl, 35Ar, 36,37K, 39Ca(EC), (β+); analyzed overview of values of experimental form factors for all ground-state to ground-state and ground-state to first-excited 2+ or 4+ state T=1 and 3/2 transitions with A<39, and comparison with theoretical shell model calculations. 6He, 9Li, 12,13B, 14,15C, 16N, 19O, 20F, 23Ne, 24,24mNa, 28Al, 32Si(β-); 9,10C, 12N, 13,14O, 18Ne, 18F, 20,22Na, 22Mg, 24,24mAl, 26Si, 28,30P, 30S, 32Cl, 34Ar, 36K, 38Ca, 42Ti, 53Ni(β+); analyzed decay schemes for T=1 and T=3/2 mirror β transitions. Update of the Ft values of the isospin T=1/2 mirror β decays determine the Vud quark-mixing matrix element, taking into account recoil terms, weak magnetism, for the mirror β decays and a large set of β decays in higher isospin multiplets. Relevance to reactor neutrino problem and reactor neutrino anomaly.

NUCLEAR MOMENTS 1n, 1,3H, 3He, 11,13C, 11B, 13,15N, 15,17O, 17,19F, 19,21Ne, 21,23Na, 23,25Mg, 25,27Al, 27,29Si, 29,31P, 31,33S, 33,35Cl, 35,37Ar, 37,39K, 39,41Ca, 41,43Sc, 43,45Ti, 45,47V, 47,49Cr, 49,51Mn, 51,53Fe, 53,55Co, 55,57Ni, 57,59Cu, 59,61Zn, 61,63Ga, 67As, 67Se, 71Br, 71Kr, 75Rb, 75,77Sr; analyzed and evaluated measured magnetic dipole moments of T=1/2 mirror nuclei; deduced adopted values, and calculated magnetic moments for which no experimental data available; deduced conserved vector current (CVC) form factors, and compared with theoretical shell-model calculations.

doi: 10.1103/PhysRevC.107.015502
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2022VA06      Phys.Rev. C 106, 015506 (2022)

S.Vanlangendonck, N.Severijns, L.Hayen, F.Gluck

Influence of the recoil-order and radiative correction on the β decay correlation coefficients in mirror decays

RADIOACTIVITY 3H(β-); 11C, 13N, 15O, 17F, 19Ne, 21Na, 23Mg, 25Al, 27Si, 29P, 31S, 33Cl, 35Ar, 37K, 39K, 39Ca, 41Sc, 43Ti, 45V(EC), (β+); compiled J, π, T1/2 of parent activities, Gamow-Teller to Fermi mixing ratios, previous, ongoing, and proposed measurements of β correlation coefficients for the mirror beta decays; analyzed dominant standard model correction terms for the recoil-order and the radiative correction in measurements of β-asymmetry parameter and βν(θ); calculated and evaluated recoil-order correction using Holstein formalism with the impulse approximation, semianalytical radiative corrections. Relevance to the planning of future experiments for determination of the β decay correlation coefficients which can provide bounds on the existence of exotic current, and possible existence of right-handed neutrinos.

doi: 10.1103/PhysRevC.106.015506
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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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2020AR04      Phys.Rev. C 101, 055501 (2020)

V.Araujo-Escalona, D.Atanasov, X.Flechard, P.Alfaurt, P.Ascher, B.Blank, L.Daudin, M.Gerbaux, J.Giovinazzo, S.Grevy, T.Kurtukian-Nieto, E.Lienard, G.Quemener, N.Severijns, S.Vanlangendonck, M.Versteegen, D.Zakoucky

Simultaneous measurements of the β-neutrino angular correlation in 32Ar pure Fermi and pure Gamow-Teller transitions using β-proton coincidences

RADIOACTIVITY 32Ar(β+), (β+p)[from Ca(p, X), E=1.4 GeV]; measured Eβ+, Iβ+, Ep, Ip, pβ+-coin using plastic scintillator for β+ detection and silicon detectors for proton detection at ISOLDE-CERN facility; deduced β-neutrino angular correlation coefficients for Fermi and Gamow-Teller transitions. Comparison with theoretical predictions of Standard model. Relevance to constraints on exotic weak interactions, and future WISArD (weak-interaction studies with 32Ar decay) research at CERN.

doi: 10.1103/PhysRevC.101.055501
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2019AB02      Phys.Rev. A 99, 042112 (2019)

C.Abel, N.J.Ayres, T.Baker, G.Ban, G.Bison, K.Bodek, V.Bondar, C.B.Crawford, P.-J.Chiu, E.Chanel, Z.Chowdhuri, M.Daum, B.Dechenaux, S.Emmenegger, L.Ferraris-Bouchez, P.Flaux, P.Geltenbort, K.Green, W.C.Griffith, M.van der Grinten, P.G.Harris, R.Henneck, N.Hild, P.Iaydjiev, S.N.Ivanov, M.Kasprzak, Y.Kermaidic, K.Kirch, H.-C.Koch, S.Komposch, P.A.Koss, A.Kozela, J.Krempel, B.Lauss, T.Lefort, Y.Lemiere, A.Leredde, P.Mohanmurthy, D.Pais, F.M.Piegsa, G.Pignol, G.Quemener, M.Rawlik, D.Rebreyend, D.Ries, S.Roccia, D.Rozpedzik, P.Schmidt-Wellenburg, A.Schnabel, N.Severijns, R.Virot, A.Weis, E.Wursten, G.Wyszynski, J.Zejma, G.Zsigmond

Magnetic-field uniformity in neutron electric-dipole-moment experiments

doi: 10.1103/PhysRevA.99.042112
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2019BR14      Hyperfine Interactions 240, 1 (2019)

L.J.Broussard, S.Baessler, T.L.Bailey, N.Birge, J.D.Bowman, C.B.Crawford, C.Cude-Woods, D.E.Fellers, N.Fomin, E.Frlez, M.T.W.Gericke, L.Hayen, A.P.Jezghani, H.Li, N.Macsai, M.F.Makela, R.R.Mammei, D.Mathews, P.L.McGaughey, P.E.Mueller, D.Pocanic, C.A.Royse, A.Salas-Bacci, S.K.L.Sjue, J.C.Ramsey, N.Severijns, E.C.Smith, J.Wexler, R.A.Whitehead, A.R.Young, B.A.Zeck

Using Nab to determine correlations in unpolarized neutron decay

RADIOACTIVITY 45Ca(β-); measured decay products, Eβ, Iβ; deduced sensitivity for the ratio of the weak axial-vector and vector coupling constants.

doi: 10.1007/s10751-018-1538-7
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2019GO01      Prog.Part.Nucl.Phys. 104, 165 (2019)

M.Gonzalez-Alonso, O.Naviliat-Cuncic, N.Severijns

New physics searches in nuclear and neutron β decay

doi: 10.1016/j.ppnp.2018.08.002
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2019HA13      Phys.Rev. C 99, 031301 (2019)

L.Hayen, J.Kostensalo, N.Severijns, J.Suhonen

First-forbidden transitions in reactor antineutrino spectra

RADIOACTIVITY 87Se, 86,89Br, 88,90,92,93,95Rb, 91Kr, 94,96,97,98Y, 95Sr, 133Sn, 135Te, 136m,137,138I, 140,142Cs, 87Se, 134mSb, 139Xe(β-)[from 235U(n, F), E=thermal]; calculated shape factors versus electron kinetic energy of dominant first-forbidden transitions above 4 MeV in the electron and antineutrino spectra of fission actinides, changes in the predicted electron and antineutrino spectra of the considered transitions compared to the allowed approximation with an optional weak magnetism correction, summed 235U electron spectrum using the fission yields from the ENDF database, and normalized spectral ratios for three experiments (Daya Bay, Reno and Double Chooz) relative to the Huber-Mueller predictions using the ENDF and ENSDF databases. Microscopic calculations using shell model approach.

doi: 10.1103/PhysRevC.99.031301
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2019HA30      Phys.Rev. C 100, 054323 (2019)

L.Hayen, J.Kostensalo, N.Severijns, J.Suhonen

First-forbidden transitions in the reactor anomaly

RADIOACTIVITY 86,89Br, 87Se, 88,90,92,93,95Rb, 91Kr, 94,96,97,98Y, 95Sr, 133Sn, 135,136Te, 134m,135Sb, 136m,137,138I, 140,142,143Cs, 139,140Xe(β-); calculated shape factors for first-forbidden non-unique β transitions using shell model, and compared with those for allowed shapes, and with data in literature, β spectra and comparison to the measured cumulative spectra measured at ILL-Grenoble for 235U; deduced uncertainty in the relative change in the prediction of the electron (antineutrino) spectra when using forbidden spectral shapes instead of simple allowed shapes, forbidden flux coverage; parametrized forbidden shape factors using Monte Carlo simulations. 235,238U, 239,241Pu; updated summation calculations, relative change in the cumulative electron and antineutrino spectra when treating the β transitions for listed isotopes as allowed and forbidden, integrated flux and inverse β decay (IBD) rate change due to the inclusion of forbidden transition shape factors, comparison of the expected spectrum change due to forbidden transitions for the different reactors: Daya Bay, RENO and Double Chooz.

doi: 10.1103/PhysRevC.100.054323
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2019KA30      Phys.Rev. C 100, 015502 (2019);Erratum Phys. Rev. C 101, 049901 (2020)

J.Karthein, D.Atanasov, K.Blaum, M.Breitenfeldt, V.Bondar, S.George, L.Hayen, D.Lunney, V.Manea, M.Mougeot, D.Neidherr, L.Schweikhard, N.Severijns, A.Welker, F.Wienholtz, R.N.Wolf, K.Zuber

QEC-value determination for 21Na → 21Ne and 23Mg → 23Na mirror-nuclei decays using high-precision mass spectrometry with ISOLTRAP at the CERN ISOLDE facility

ATOMIC MASSES 21Na, 23Mg; measured time-of-flight spectrum using laser ionization, Ramsey-type ion-cyclotron resonances, cyclotron frequency ratios using ISOLTRAP at ISOLDE-CERN facility; deduced Q(ϵ) values. Comparison with previous measurements.

RADIOACTIVITY 21Na, 23Mg(EC)[from SiC(p, X), E=1.4 GeV from CERN Proton-Synchrotron booster, followed by magnetic mass separation using the general-purpose separator (GPS), laser ion source VADLIS, and ISOLDE resonant ionization laser ion source RILIS]; deduced Q(ϵ) from measured mass excesses, logft, up-down Vud element of the Cabibbo-Kobayashi-Maskawa quark mixing matrix. Comparison between Vud values for mirror-nuclei: 19Ne, 29P, 35Ar, 37K and 21Na.

doi: 10.1103/PhysRevC.100.015502
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2018FA02      Phys.Rev. A 97, 023402 (2018)

X.Fabian, X.Flechard, B.Pons, E.Lienard, G.Ban, M.Breitenfeldt, C.Couratin, P.Delahaye, D.Durand, P.Finlay, B.Guillon, Y.Lemiere, F.Mauger, A.Mery, O.Naviliat-Cuncic, T.Porobic, G.Quemener, N.Severijns, J.-C.Thomas

Electron shakeoff following the β+ decay of 19Ne+ and 35Ar+ trapped ions

RADIOACTIVITY 19Ne, 35Ar(β+) [from C(20Ne, X)19Ne, E=95 MeV/nucleon]; measured decay products, time of flight, Eβ, Iβ; deduced ion charge-state branching ratios, one-electron ionization probabilities, charge-state branching ratios with and without recoil and Auger ionizations. Comparison with theoretical calculations.

doi: 10.1103/PhysRevA.97.023402
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2018HA13      Rev.Mod.Phys. 90, 015008 (2018)

L.Hayen, N.Severijns, K.Bodek, D.Rozpedzik, X.Mougeot

High precision analytical description of the allowed β spectrum shape

NUCLEAR STRUCTURE 14C, 14N, 25Na, 25Mg, 35S, 35Cl, 45Ca, 45Sc, 61Cr, 61Mn, 64Co, 64Ni, 100Nb, 100Mo, 104Nb, 104Mo, 121Sn, 121Sb; calculated weak charge radii. Comparison with available data.

doi: 10.1103/RevModPhys.90.015008
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2018PE08      Acta Phys.Pol. B49, 261 (2018)

M.Perkowski, K.Bodek, L.De Keukeleere, L.Hayen, A.Kozela, K.Lojek, D.Rozpedzik, N.Severijns

Initial Tests of MiniBETA Spectrometer Performance

doi: 10.5506/aphyspolb.49.261
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2017FI07      Phys.Rev. C 96, 025501 (2017)

P.Finlay, A.T.Laffoley, G.C.Ball, P.C.Bender, M.R.Dunlop, R.Dunlop, G.Hackman, J.R.Leslie, A.D.MacLean, D.Miller, M.Moukaddam, B.Olaizola, N.Severijns, J.K.Smith, D.Southall, C.E.Svensson

High-precision half-life determination for 21Na using a 4π gas-proportional counter

RADIOACTIVITY 21Na(β+)[from Ta(p, X), E=480 MeV at TRIUMF cyclotron]; measured Eγ, βγ-coin, β+ particles, precise half-life of 21Na decay using 4π continuous-flow gas proportional counter at TRIUMF-ISAC facility. detailed analysis of half-life data and systematic uncertainties. 21Na; deduced world-average half-life by combining present result with previous measurements, and discussed contribution to the uncertainty in the Ft value of the superallowed β+ transition between the isospin T=1/2 mirror nuclei 21Na and 21Ne.

doi: 10.1103/PhysRevC.96.025501
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2017KO26      J.Phys.(London) G44, 084005 (2017)

M.Kowalska, P.Aschenbrenner, M.Baranowski, M.L.Bissell, W.Gins, R.D.Harding, H.Heylen, G.Neyens, S.Pallada, N.Severijns, Ph.Velten, M.Walczak, F.Wienholtz, Z.Y.Xu, X.F.Yang, D.Zakoucky

New laser polarization line at the ISOLDE facility

NUCLEAR MOMENTS 26,28Na; measured longitudinal transitional field; deduced hyperfine structures of the D2 line, ratio of the nuclear spin polarization. Comparison with available data.

doi: 10.1088/1361-6471/aa77d7
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2017SE09      J.Phys.(London) G44, 074002 (2017)

N.Severijns, B.Blank

Weak interaction physics at ISOLDE

RADIOACTIVITY 38,39Ca, 37K, 10C(β+); measured decay products, Eγ, Iγ; deduced T1/2.

ATOMIC MASSES 18Ne, 22Na, 22Mg, 26Al, 34Ar, 38ca, 74Rb; measured cyclotron frequencies using the time-of-flight ion-cyclotron-resonance technique with ISOLTRAP; deduced mass excess, Q-values.

doi: 10.1088/1361-6471/aa71e3
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2016BA63      Eur.Phys.J. A 52, 326 (2016)

G.Ban, G.Bison, K.Bodek, Z.Chowdhuri, P.Geltenbort, W.C.Griffith, V.Helaine, R.Henneck, M.Kasprzak, Y.Kermaidic, K.Kirch, S.Komposch, P.A.Koss, A.Kozela, J.Krempel, B.Lauss, T.Lefort, Y.Lemiere, A.Mtchedlishvili, M.Musgrave, O.Naviliat-Cuncic, F.M.Piegsa, E.Pierre, G.Pignol, G.Quemener, M.Rawlik, D.Ries, D.Rebreyend, S.Roccia, G.Rogel, P.Schmidt-Wellenburg, N.Severijns, E.Wursten, J.Zejma, G.Zsigmond

Ultracold neutron detection with 6Li-doped glass scintillators

doi: 10.1140/epja/i2016-16326-4
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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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2015AF03      Phys.Rev.Lett. 115, 162502 (2015)

S.Afach, N.J.Ayres, G.Ban, G.Bison, K.Bodek, Z.Chowdhuri, M.Daum, M.Fertl, B.Franke, W.C.Griffith, Z.D.Grujic, P.G.Harris, W.Heil, V.Helaine, M.Kasprzak, Y.Kermaidic, K.Kirch, P.Knowles, H.-C.Koch, S.Komposch, A.Kozela, J.Krempel, B.Lauss, T.Lefort, Y.Lemiere, A.Mtchedlishvili, M.Musgrave, O.Naviliat-Cuncic, J.M.Pendlebury, F.M.Piegsa, G.Pignol, C.Plonka-Spehr, P.N.Prashanth, G.Quemener, M.Rawlik, D.Rebreyend, D.Ries, S.Roccia, D.Rozpedzik, P.Schmidt-Wellenburg, N.Severijns, J.A.Thorne, A.Weis, E.Wursten, G.Wyszynski, J.Zejma, J.Zenner, G.Zsigmond

Observation of Gravitationally Induced Vertical Striation of Polarized Ultracold Neutrons by Spin-Echo Spectroscopy

doi: 10.1103/PhysRevLett.115.162502
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2015AF05      Eur.Phys.J. A 51, 143 (2015)

S.Afach, G.Ban, G.Bison, K.Bodek, Z.Chowdhuri, M.Daum, M.Fertl, B.Franke, P.Geltenbort, Z.D.Grujic, L.Hayen, V.Helaine, R.Henneck, M.Kasprzak, Y.Kermaidic, K.Kirch, S.Komposch, A.Kozela, J.Krempel, B.Lauss, T.Lefort, Y.Lemiere, A.Mtchedlishvili, O.Naviliat-Cuncic, F.M.Piegsa, G.Pignol, P.N.Prashanth, G.Quemener, M.Rawlik, D.Ries, D.Rebreyend, S.Roccia, D.Rozpedzik, P.Schmidt-Wellenburg, N.Severijns, A.Weis, E.Wursten, G.Wyszynski, J.Zejma, G.Zsigmond

A device for simultaneous spin analysis of ultracold neutrons

doi: 10.1140/epja/i2015-15143-7
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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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2014VA12      Phys.Rev. C 90, 025502 (2014)

S.Van Gorp, M.Breitenfeldt, M.Tandecki, M.Beck, P.Finlay, P.Friedag, F.Gluck, A.Herlert, V.Kozlov, T.Porobic, G.Soti, E.Traykov, F.Wauters, Ch.Weinheimer, D.Zakoucky, N.Severijns

First β-ν correlation measurement from the recoil-energy spectrum of Penning trapped 35Ar ions

RADIOACTIVITY 35Ar(β+)[from Ca(p, X), E=1.4 GeV]; measured recoil (35Cl) ion energy spectrum, βν(θ) using REXTRAP, WITCH systems at ISOLDE-CERN facility; deduced beta-neutrino correlation coefficient 'a' and compared with predicted value from Standard model. SIMBUCA simulation. Search for exotic currents in weak interactions.

doi: 10.1103/PhysRevC.90.025502
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2013CO25      Phys.Rev. A 88, 041403 (2013)

C.Couratin, X.Fabian, B.Fabre, B.Pons, X.Flechard, E.Lienard, G.Ban, M.Breitenfeldt, P.Delahaye, D.Durand, A.Mery, O.Naviliat-Cuncic, T.Porobic, G.Quemener, D.Rodriguez, N.Severijns, J.-C.Thomas, S.Van Gorp

Electron shakeoff following the Β+ decay of trapped 35Ar+ ions

RADIOACTIVITY 35Ar(β+); measured decay products, nuclear recoil; deduced charge-state distribution of recoiling daughter. Comparison with shakeoff and Auger processes calculations.

doi: 10.1103/PhysRevA.88.041403
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2013SE02      Phys.Scr. T152, 014018 (2013)

N.Severijns, O.Naviliat-Cuncic

Structure and symmetries of the weak interaction in nuclear beta decay

doi: 10.1088/0031-8949/2013/T152/014018
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2012KO16      Phys.Rev. C 85, 045501 (2012)

A.Kozela, G.Ban, A.Bialek, K.Bodek, P.Gorel, K.Kirch, St.Kistryn, O.Naviliat-Cuncic, N.Severijns, E.Stephan, J.Zejma

Measurement of the transverse polarization of electrons emitted in free neutron decay

RADIOACTIVITY 1n(β-); measured components of transverse polarization of electrons emitted in the β decay of polarized, free neutrons using Mott Scattering; deduced T-odd and P-odd correlation coefficient. Comparison with predictions of Standard model. Discussed implications for leptoquark exchange model and the minimal supersymmetric model with R-parity violation.

doi: 10.1103/PhysRevC.85.045501
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2011BE16      Eur.Phys.J. A 47, 45 (2011)

M.Beck, S.Coeck, V.Yu.Kozlov, M.Breitenfeldt, P.Delahaye, P.Friedag, F.Gluck, M.Herbane, A.Herlert, I.S.Kraev, J.Mader, M.Tandecki, S.Van Gorp, F.Wauters, Ch.Weinheimer, F.Wenander, N.Severijns, and the ISOLDE Collaboration

First detection and energy measurement of recoil ions following beta decay in a Penning trap with the WITCH experiment

RADIOACTIVITY 124In(β-); measured decay products, recoil ions; deduced recoil energy spectrum. Penning trap measurements.

doi: 10.1140/epja/i2011-11045-0
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2011GO17      Phys.Rev. C 84, 014323 (2011)

V.V.Golovko, F.Wauters, S.Cottenier, M.Breitenfeldt, V.De Leebeeck, S.Roccia, G.Soti, M.Tandecki, E.Traykov, S.Van Gorp, D.Zakoucky, N.Severijns

Hyperfine field and hyperfine anomalies of copper impurities in iron

NUCLEAR MOMENTS 59,67,69,71Cu; analyzed magnetic moments obtained from laser spectroscopy and nuclear magnetic resonance frequencies from β-NMR experiments; deduced hyperfine anomalies, and hyperfine magnetic field of Cu in Fe host.

doi: 10.1103/PhysRevC.84.014323
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2011KO09      Acta Phys.Pol. B42, 789 (2011)

A.Kozela, G.Ban, A.Bialek, K.Bodek, P.Gorel, K.Kirch, St.Kistryn, M.Kuzniak, O.Naviliat-Cuncic, N.Severijns, E.Stephan, J.Zejma

Free Neutron Decay and Time Reversal Violation

RADIOACTIVITY 1n(β-); measured Ee, Ie; deduced bounds on scalar vs. tensor normalized couplings, T, P-correlation coefficients.

doi: 10.5506/APhysPolB.42.789
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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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2010BO22      Eur.Phys.J. A 45, 159 (2010)

I.N.Borzov, E.E.Saperstein, S.V.Tolokonnikov, G.Neyens, N.Severijns

Description of magnetic moments of long isotopic chains within the FFS theory

NUCLEAR STRUCTURE 57,59,61,63,65,67,69,71,73,75Cu, 111,113,115,117,119,121,123,125,127,129,131Sn, 133Sb, 135I, 137Cs, 139La, 141Pr, 143Pm, 145Eu, 147Tb, 183,185,187,189,191,193,195,199,201,203,207,209,211Pb; calculated μ for ground and excited states using self-consistent finite Fermi system theory with pairing and quasiparticle continuum. Comparison with data and other calculations.

doi: 10.1140/epja/i2010-10985-y
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2010GO08      Phys.Rev. C 81, 054323 (2010)

V.V.Golovko, I.S.Kraev, T.Phalet, B.Delaure, M.Beck, V.Yu.Kozlov, S.Coeck, F.Wauters, P.Herzog, Ch.Tramm, D.Zakoucky, D.Venos, D.Srnka, M.Honusek, U.Koster, N.Severijns

Magnetic moment of 104Agm and the hyperfine magnetic field of Ag in Fe using nuclear magnetic resonance on oriented nuclei

NUCLEAR MOMENTS 104mAg; measured resonance frequencies and magnetic moment by nuclear magnetic resonance on oriented nuclei at ISOLDE/CERN. deduced hyperfine field of Ag impurities in Fe. β-NMR/ON method. Comparison with magnetic moments of 102,104,106,108,110Ag and shell model calculations.

RADIOACTIVITY 104Ag(EC), (β+)[from 104Cd(EC), (β+) formed in Sn(p, X), E=1.4GeV]; measured Eγ, Iγ, Eβ, Iβ, γ(θ).

doi: 10.1103/PhysRevC.81.054323
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2010WA40      Phys.Rev. C 82, 055502 (2010)

F.Wauters, I.Kraev, D.Zakoucky, M.Beck, M.Breitenfeldt, V.De Leebeeck, V.V.Golovko, V.Yu.Kozlov, T.Phalet, S.Roccia, G.Soti, M.Tandecki, I.S.Towner, E.Traykov, S.Van Gorp, N.Severijns

Precision measurements of the 60Co β-asymmetry parameter in search for tensor currents in weak interactions

RADIOACTIVITY 60Co(β-); measured E(β), I(β), γ(θ), β asymmetry parameter using a polarized 60Co source with low-temperature nuclear orientation method. 57Co, 54Mn(EC); measured γ(θ) and used as references for temperature measurement. Systematics of β-asymmetry parameters for Gamow-Teller transitions and for T=1/2 mirror nuclei. Tensor currents in weak interactions.

doi: 10.1103/PhysRevC.82.055502
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2010WA42      Phys.Rev. C 82, 064317 (2010)

F.Wauters, B.Verstichel, M.Breitenfeldt, V.De Leebeeck, V.Yu.Kozlov, I.Kraev, S.Roccia, G.Soti, M.Tandecki, E.Traykov, S.Van Gorp, D.Zakoucky, N.Severijns

Half-life of 221Fr in Si and Au at 4 K and at millikelvin temperatures

RADIOACTIVITY 221Fr(α)[from U(p, X), E=1.4 GeV]; measured Eα, Iα, Eγ, Iγ parent half-life at 20 mK and 4 K in Si and Au host media. No dependency on the solid-state environment and temperature of this α decaying isotope is observed up to a level of 0.1%.

doi: 10.1103/PhysRevC.82.064317
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2009BA56      Nucl.Phys. A827, 422c (2009)

G.Ban, A.Bialek, K.Bodek, J.Bozek, P.Gorel, K.Kirch, St.Kistryn, A.Kozela, M.Kuzniak, O.Naviliat-Cuncic, N.Severijns, E.Stephan, J.Zejma

Search for Exotic Couplings in Neutron Decay: A Measurement of the Transverse Polarization of Electrons

doi: 10.1016/j.nuclphysa.2009.05.090
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2009KO11      Phys.Rev.Lett. 102, 172301 (2009)

A.Kozela, G.Ban, A.Bialek, K.Bodek, P.Gorel, K.Kirch, St.Kistryn, M.Kuzniak, O.Naviliat-Cuncic, J.Pulut, N.Severijns, E.Stephan, J.Zejma

Measurement of the Transverse Polarization of Electrons Emitted in Free-Neutron Decay

RADIOACTIVITY 1n(β-); measured transverse polarization of electrons.

doi: 10.1103/PhysRevLett.102.172301
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2009NA06      Phys.Rev.Lett. 102, 142302 (2009)

O.Naviliat-Cuncic, N.Severijns

Test of the Conserved Vector Current Hypothesis in T=1/2 Mirror Transitions and New Determination of (Vud)

doi: 10.1103/PhysRevLett.102.142302
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2009NA42      Eur.Phys.J. A 42, 327 (2009)

O.Naviliat-Cuncic, N.Severijns

|Vud| from T = 1/2 mirror transitions and the role of atom and ion traps

doi: 10.1140/epja/i2009-10821-7
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2009SE09      Phys.Rev. C 79, 064322 (2009)

N.Severijns, A.A.Belyaev, A.L.Erzinkyan, P.-D.Eversheim, V.T.Filimonov, V.V.Golovko, G.M.Gurevich, P.Herzog, I.S.Kraev, A.A.Lukhanin, V.I.Noga, V.P.Parfenova, T.Phalet, A.V.Rusakov, M.Tandecki, Yu.G.Toporov, C.Tramm, E.Traykov, S.Van Gorp, V.N.Vyachin, F.Wauters, D.Zakoucky, E.Zotov

Hyperfine field of einsteinium in iron and nuclear magnetic moment of 254Es

NUCLEAR MOMENTS 254Es, 250Bk; measured magnetic dipole moment using low temperature nuclear orientation (LTNO) and hyperfine fields in an iron host-lattice. Comparison with deformed single-particle model calculations.

RADIOACTIVITY 253,254Es, 255Fm(α); measured Eα, Iα, α(θ). 250Bk(β-); measured γ(θ).

doi: 10.1103/PhysRevC.79.064322
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2009WA22      Phys.Rev. C 80, 062501 (2009)

F.Wauters, V.De Leebeeck, I.Kraev, M.Tandecki, E.Traykov, S.Van Gorp, N.Severijns, D.Zakoucky

β asymmetry parameter in the decay of 114In

RADIOACTIVITY 114In(β-); measured β spectra, β(θ, T, H), and ce; using low-temperature nuclear orientation technique; deduced β-asymmetry parameter. Comparison with GEANT4-based simulation code and predictions of Standard model.

doi: 10.1103/PhysRevC.80.062501
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Data from this article have been entered in the XUNDL database. For more information, click here.


2008GU05      Bull.Rus.Acad.Sci.Phys. 72, 315 (2008); Izv.Akad.Nauk RAS, Ser.Fiz. 72, 340 (2008)

G.M.Gurevich, A.L.Erzinkyan, P.-D.Eversheim, V.T.Filimonov, V.V.Golovko, P.Herzog, I.S.Kraev, A.A.Lukhanin, A.A.Belyaev, V.P.Parfenova, T.Phalet, A.V.Rusakov, N.Severijns, Yu.G.Toporov, C.Tramm, V.N.Vyachin, D.Zakoucky, E.Zotov

The effect of metallic environment and low temperature on the 253Es α decay rate

RADIOACTIVITY 253Es(α); measured Eα, Iα, Eγ, Iγ, half-life for source implanted in an Iron foil at low temperatures.

doi: 10.3103/s11954-008-3010-3
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2008SE10      Phys.Rev. C 78, 055501 (2008)

N.Severijns, M.Tandecki, T.Phalet, I.S.Towner

Ft values of the T = 1/2 mirror β transitions

RADIOACTIVITY 3H, 11C, 13N, 15O, 17F, 19Ne, 21Na, 23Mg, 25Al, 27Si, 29P, 31S, 33Cl, 35Ar, 37K, 39Ca, 41Sc, 43Ti, 45V, 47Cr, 49Mn, 51Fe, 53Co, 57Cu, 59Zn, 61Ga, 71Kr, 75Sr, 55Ni, 63Ge, 65As, 67Se, 77Y, 79Zr, 83Mo(EC), (β+); analyzed half-lives, branching ratios, electron-capture probabilities; deduced ft values, correlation coefficients.

doi: 10.1103/PhysRevC.78.055501
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2008ZA01      Acta Phys.Pol. B39, 411 (2008)

D.Zakoucky, J.R.Stone, G.Goldring, N.J.Stone, N.Severijns, M.Hass, T.Giles, U.Koester, I.S.Kraev, S.Lakshmi, M.Lindroos, F.Wauters

Parity Non-Conservation Observed in Nuclear γ-Decay of 180mHf

RADIOACTIVITY 180Hf(IT); measured Eγ, Iγ as a function of temperature and nuclear orientation. Deduced assymetry of the isomeric transition, parity mixing.


2007SE08      Phys.Rev. C 76, 024304 (2007)

N.Severijns, A.A.Belyaev, A.L.Erzinkyan, P.-D.Eversheim, V.T.Filimonov, V.V.Golovko, G.M.Gurevich, P.Herzog, I.S.Kraev, A.A.Lukhanin, V.I.Noga, V.P.Parfenova, T.Phalet, A.V.Rusakov, Yu.G.Toporov, C.Tramm, V.N.Vyachin, F.Wauters, D.Zakoucky, E.Zotov

α-decay half-life of 253Es in metallic Fe at temperatures between 4 K and 50 mK

RADIOACTIVITY 253Es(α); measured T1/2 at low temperatures.

doi: 10.1103/PhysRevC.76.024304
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2007ST20      Phys.Rev. C 76, 025502 (2007)

J.R.Stone, G.Goldring, N.J.Stone, N.Severijns, M.Hass, D.Zakoucky, T.Giles, U.Koster, I.S.Kraev, S.Lakshmi, M.Lindroos, F.Wauters

Confirmation of parity violation in the γ decay of 180Hfm

RADIOACTIVITY 180Hf(IT); measured Eγ, Iγ, angular distributions and mixing ratio. Deduced presence of irregular E2 admixture in the isomeric transition.

doi: 10.1103/PhysRevC.76.025502
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2006BA52      Nucl.Instrum.Methods Phys.Res. A565, 711 (2006)

G.Ban, M.Beck, A.Bialek, K.Bodek, P.Gorel, K.Kirch, St.Kistryn, A.Kozela, M.Kuzniak, A.Lindroth, O.Naviliat-Cuncic, J.Pulut, N.Severijns, E.Stephan, J.Zejma

A Mott polarimeter for the search of time reversal violation in the decay of free neutrons

RADIOACTIVITY 1n(β-); measured electron polarization following decay of polarized cold neutrons.

doi: 10.1016/j.nima.2006.05.166
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2006GO32      Phys.Rev. C 74, 044313 (2006)

V.V.Golovko, I.S.Kraev, T.Phalet, N.Severijns, D.Venos, D.Zakoucky, P.Herzog, C.Tramm, U.Koster, D.Srnka, M.Honusek, B.Delaure, M.Beck, V.Yu.Kozlov, A.Lindroth

Nuclear spin-lattice relaxation of 62Cu at low temperatures in iron

NUCLEAR MOMENTS 62Cu; measured nuclear spin-lattice relaxation rate in iron.

doi: 10.1103/PhysRevC.74.044313
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2006GU32      Bull.Rus.Acad.Sci.Phys. 70, 282 (2006)

G.M.Gurevich, A.L.Erzinkyan, P.-D.Eversheim, V.T.Filimonov, V.Golovko, P.Herzog, I.Kraev, A.A.Lukhanin, A.A.Belyaev, V.I.Noga, V.P.Parfenova, T.Phalet, A.V.Rusakov, N.Severijns, Yu.G.Toporov, C.Tramm, V.N.Vyachin, D.Zakoucky, E.Zotov

Angular anisotropy of α- and γ-emission in decay of oriented 254Es and its daughter 250Bk nucleus

RADIOACTIVITY 254Es(α); 250Bk(β-); measured Eα, Eγ, angular distribution for decay from oriented sources.


2006KH04      JETP Lett. 83, 5 (2006); Erratum JETP Lett. 83, 366 (2006); Comment JETP Lett. 84, 231 (2006)

R.U.Khafizov, N.Severijns, O.Zimmer, H.-F.Wirth, D.Rich, S.V.Tolokonnikov, V.A.Solovei, M.R.Kolhidashvili

Observation of the Neutron Radiative Decay

RADIOACTIVITY 1n(β-); measured βpγ-coin; deduced branching ratio for radiative decay. Note: In comment, several co-authors deny responsibility for article contents.

doi: 10.1134/S0021364006010024
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2006KO63      Int.J. Mass Spectrom. 251, 159 (2006)

V.Yu.Kozlov, N.Severijns, D.Beck, M.Beck, S.Coeck, B.Delaure, A.Lindroth, S.Kopecky, P.Delahaye, F.Wenander, V.V.Golovko, I.S.Kraev, T.Phalet, and the ISOLDE NIPNET and TRAPSPEC Collaborations

The WITCH experiment: Completion of a set-up to investigate the structure of weak interactions with a Penning trap

RADIOACTIVITY 26mAl, 38mK(β+); measured recoil energy spectrum in β decay, βν(θ). 20Ne, 23Na, 39K; measured excitation, and ion beam properties on the WITCH set-up. Penning trap method. 35Ar; measured half-life and time-of-flight spectrum.

doi: 10.1016/j.ijms.2006.01.050
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2005BO35      J.Res.Natl.Inst.Stand.Technol. 110, 461 (2005)

K.Bodek, G.Ban, M.Beck, A.Bialek, T.Brys, A.Czarnecki, W.Fetscher, P.Gorel, K.Kirch, St.Kistryn, A.Kozela, M.Kuzniak, A.Lindroth, O.Naviliat-Cuncic, J.Pulut, A.Serebrov, N.Severijns, E.Stephan, J.Zejma

Search for Time Reversal Violating Effects: R-Correlation Measurement in Neutron Decay

RADIOACTIVITY 1n(β-); measured Eβ. Plans for measurement of time-reversal violating effects discussed.

doi: 10.6028/jres.110.071
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2005BY04      J.Res.Natl.Inst.Stand.Technol. 110, 415 (2005)

J.Byrne, R.U.Khafizov, Yu A.Mostovoi, O.Rozhnov, V.A.Solovei, M.Beck, V.U.Kozlov, N.Severijns

Search for Radiative β-Decay of the Free Neutron

RADIOACTIVITY 1n(β-); measured Ep, Eβ, Eγ, pγ-, βγ-, pβ-coin; deduced upper limit for radiative decay branching ratio.

doi: 10.6028/jres.110.063
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2005GO44      Phys.Rev. C 72, 064316 (2005)

V.V.Golovko, I.S.Kraev, T.Phalet, N.Severijns, D.Zakoucky, D.Venos, P.Herzog, C.Tramm, D.Srnka, M.Honusek, U.Koster, B.Delaure, M.Beck, V.Yu.Kozlov, A.Lindroth, S.Coeck

Nuclear magnetic moment of 69As from on-line β-NMR on oriented nuclei

RADIOACTIVITY 69As(EC), (β+) [from Zr(p, X)]; measured Eβ, β-asymmetry, β-NMR spectrum from polarized source. 69As deduced μ.

doi: 10.1103/PhysRevC.72.064316
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2005GU40      Bull.Rus.Acad.Sci.Phys. 69, 821 (2005)

G.M.Gurevich, A.L.Erzinkyan, P.-D.Eversheim, V.T.Filimonov, V.Golovko, P.Herzog, I.Kraev, A.A.Lukhanin, A.A.Belyaev, V.I.Noga, V.P.Parfenova, T.Phalet, A.V.Rusakov, N.Severijns, Yu.G.Toporov, V.N.Vyachin, D.Zakoucki

Angular distributions of α-particles emitted by oriented 253Es and 255Fm nuclei

RADIOACTIVITY 253Es, 255Fm(α) [from Cm, 252Cf(n, X)]; measured Eα, Eγ, angular anisotropy from oriented nuclei implanted in iron.


2005SE08      Phys.Rev. C 71, 044324 (2005)

N.Severijns, A.A.Belyaev, A.L.Erzinkyan, P.-D.Eversheim, V.T.Filimonov, V.V.Golovko, G.M.Gurevich, P.Herzog, I.S.Kraev, A.A.Lukhanin, V.I.Noga, V.P.Parfenova, T.Phalet, A.V.Rusakov, Yu.G.Toporov, C.Tramm, V.N.Vyachin, D.Zakoucky, E.Zotov

Angular distribution of particles from oriented 253, 254Es and 255Fm nuclei

RADIOACTIVITY 253,254Es, 255Fm(α) [from 252Cf(n, X)]; measured Eα, angular distributions from decay of oriented nuclei; deduced anisotropies. Comparison with model predictions.

doi: 10.1103/PhysRevC.71.044324
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2005SE14      Phys.Rev. C 71, 064310 (2005)

N.Severijns, D.Venos, P.Schuurmans, T.Phalet, M.Honusek, D.Srnka, B.Vereecke, S.Versyck, D.Zakoucky, U.Koster, M.Beck, B.Delaure, V.Golovko, I.Kraev

Isospin mixing in the T=5/2 ground state of 71As

NUCLEAR MOMENTS 71As; measured Eγ, Eβ, β-decay angular distributions from oriented nuclei; deduced β-asymmetry parameter. 71As deduced ground-state admixture. Low-temperature nuclear orientation technique.

RADIOACTIVITY 71As(β+); measured Eγ, Eβ, β-decay angular distributions from oriented nuclei; deduced β-asymmetry parameter. 71As deduced ground-state admixture. Low-temperature nuclear orientation technique.

doi: 10.1103/PhysRevC.71.064310
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2004GO39      Phys.Rev. C 70, 014312 (2004)

V.V.Golovko, I.Kraev, T.Phalet, N.Severijns, B.Delaure, M.Beck, V.Kozlov, A.Lindroth, S.Versyck, D.Zakoucky, D.Venos, D.Srnka, M.Honusek, P.Herzog, C.Tramm, U.Koster, I.S.Towner

Nuclear magnetic moment of 59Cu with on-line β-NMR on oriented nuclei

RADIOACTIVITY 59Cu(β+); measured Eβ, Iβ(θ, H), NMR spectrum from low-temperature oriented source. 59Cu deduced μ. Comparison with model predictions.

doi: 10.1103/PhysRevC.70.014312
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2004GU22      Bull.Rus.Acad.Sci.Phys. 68, 1721 (2004)

G.M.Gurevich, A.L.Erzinkyan, P.-D.Eversheim, V.T.Filimonov, V.Golovko, P.Herzog, I.Kraev, A.M.Lapik, A.A.Lukhanin, A.A.Belyaev, V.I.Noga, V.P.Parfenova, T.Phalet, A.V.Rusakov, N.Severijns, Yu.G.Toporov, V.N.Vyachin, D.Zakoucky

Angular anisotropy of α-decay and spontaneous fission of oriented Am, Es, and Fm nuclei

RADIOACTIVITY 253,254Es, 255Fm(α); measured Eα, angular distributions from decay of oriented nuclei; deduced anisotropies.


2004ZA01      Nucl.Instrum.Methods Phys.Res. A520, 80 (2004)

D.Zakoucky, D.Srnka, D.Venos, V.Golovko, I.Kraev, T.Phalet, P.Schuurmans, N.Severijns, B.Vereecke, S.Versyck, and the NICOLE and ISOLDE Collaborations

HPGe detectors for low-temperature nuclear orientation

NUCLEAR MOMENTS 71As, 59Cu; measured β-decay angular distributions from oriented nuclei. 71As deduced ground-state admixture. 59Cu deduced μ. Low-temperature nuclear orientation technique.

doi: 10.1016/j.nima.2003.11.226
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2003LI52      Nucl.Phys. A721, 1103c (2003)

A.Lindroth, M.Beck, B.Delaure, V.Yu.Kozlov, N.Severijns, F.Ames, D.Beck, V.V.Golovko, I.Kraev, T.Phalet, S.Versyck

WITCH: Testing the Standard Model using a β-recoil Spectrometer with a Trapped Ion Cloud as Source

doi: 10.1016/S0375-9474(03)01295-8
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2003VE03      At.Data Nucl.Data Tables 83, 1 (2003)

D.Venos, D.Zakoucky, N.Severijns

Spin-lattice relaxation attenuation coefficients for on-line nuclear orientation experiments

doi: 10.1016/S0092-640X(02)00016-5
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2003VO01      Eur.Phys.J. A 16, 139 (2003)

V.Vorobel, Ch.Briancon, V.Brudanin, V.Egorov, J.Deutsch, R.Prieels, N.Severijns, Yu.Shitov, Ch.Vieu, Ts.Vylov, I.Yutlandov, Sh.Zaparov

Beta-neutrino angular correlation in the decay of 14O

RADIOACTIVITY 14O(β+) [from 12C(3He, n)]; measured Eγ, βγ-coin, angular correlation; deduced beta-neutrino coupling coefficient. Role of interatomic interactions discussed.

doi: 10.1140/epja/i2002-10067-y
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2002BE54      Nucl.Phys. A701, 369c (2002)

D.Beck, F.Ames, M.Beck, G.Bollen, B.Delaure, J.Deutsch, J.Dilling, O.Forstner, T.Phalet, R.Prieels, W.Quint, P.Schmidt, P.Schuurmans, N.Severijns, B.Vereecke, S.Versyck, and the EUROTRAPS Collaboration

Search for New Physics in Beta-Neutrino Correlations with the WITCH Spectrometer

doi: 10.1016/S0375-9474(01)01612-8
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2002BE79      Pisma Zh.Eksp.Teor.Fiz. 76, 392 (2002); JETP Lett. 76, 332 (2002)

M.Beck, J.Byrne, R.U.Khafizov, V.Yu.Kozlov, Yu.A.Mostovoi, O.V.Rozhnov, N.Severijns, V.A.Solovei

The Upper Limit of the Branching Ratio for Radiative Beta Decay of Free Neutrons

RADIOACTIVITY 1n(β-); measured radiative decay mode branching ratio upper limit.

doi: 10.1134/1.1525031
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2002SE08      Eur.Phys.J. A 15, 217 (2002)

N.Severijns

Low-energy weak-interaction studies

doi: 10.1140/epja/i2002-10040-x
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2002VO11      Czech.J.Phys. 52, 547 (2002)

V.Vorobel, V.Egorov, V.Brudanin, Yu.Shitov, Sh.Zaparov, J.Deutsch, R.Prieels, Ch.Briancon, N.Severijns

Investigation of β-ν Angular Correlation in the β+ Decay of 18Ne and 14O

RADIOACTIVITY 14O, 18Ne(β+) [from 12C, 16O(3He, n)]; measured Eγ, βγ-coin; deduced β-ν angular correlation.

doi: 10.1023/A:1015365511995
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2001BE74      Hyperfine Interactions 132, 473 (2001)

D.Beck, F.Ames, M.Beck, G.Bollen, B.Delaure, P.Schuurmans, S.Schwarz, P.Schmidt, N.Severijns, O.Forstner

Space Charge Effects in a Gas Filled Penning Trap

doi: 10.1023/A:1011974828147
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2001GA59      Eur.Phys.J. A 11, 413 (2001)

M.Gaelens, J.Andrzejewski, J.Camps, P.Decrock, M.Huyse, K.Kruglov, W.F.Mueller, A.Piechaczek, N.Severijns, J.Szerypo, G.Vancraeynest, P.Van Duppen, J.Wauters

High-Precision Measurement of the 14O Half-Life using a Mass-Separated Radioactive Beam

RADIOACTIVITY 14O(EC) [from 12C(3He, n), E=36 MeV]; measured Eγ, T1/2. Isotope Separator On-line method. Comparison with earlier data.

doi: 10.1007/s100500170053
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2001TH18      Nucl.Phys. A694, 559 (2001)

E.Thomas, R.Prieels, M.Allet, K.Bodek, J.Camps, J.Deutsch, F.Gimeno-Nogues, J.Govaerts, J.Lang, O.Naviliat-Cuncic, I.Pepe, P.Quin, N.Severijns, J.Sromicki

Positron Polarization in the Decay of Polarized 12N: A precision tests of the standard model

RADIOACTIVITY 12N(β+) [from 12C(polarized p, n)]; measured positrons longitudinal polarization following decay of polarized source; deduced constraints on mass of right-handed gauge boson. Comparison with standard model predictions.

doi: 10.1016/S0375-9474(01)01083-1
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2000SC18      Nucl.Phys. A672, 89 (2000)

P.Schuurmans, J.Camps, T.Phalet, N.Severijns, B.Vereecke, S.Versyck

Isospin Mixing in the Ground State of 52Mn

RADIOACTIVITY 52Mn(β+) [from Fe(p, X)]; measured Eβ, Iβ(θ) from oriented source; deduced β asymmetry parameter. 52Mn deduced isospin mixing probability. Comparison with model prediction.

doi: 10.1016/S0375-9474(00)00055-5
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2000SC46      Hyperfine Interactions 129, 163 (2000)

P.Schuurmans, I.Berkes, P.Herzog, N.Severijns, and the NICOLE and the ISOLDE Collaboration

Alpha-anisotropy studies of near spherical nuclei at ISOLDE

RADIOACTIVITY 189,191,193Bi, 205,207,209Rn, 199,201,203,205,207,209,211,215,217At(α); measured α anisotropy vs temperature, oriented nuclei; analyzed α anisotropy data; deduced mixing ratios. Comparison with model predictions.

doi: 10.1023/A:1012657715807
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2000SE23      Hyperfine Interactions 129, 223 (2000)

N.Severijns, J.Deutsch, D.Beck, M.Beck, B.Delaure, T.Phalet, R.Prieels, P.Schuurmans, B.Vereecke, S.Versyck

Fundamental weak interaction studies using polarised nuclei and ion traps

RADIOACTIVITY 17F(β+), 118Sb(β+), (EC); measured polarization asymmetry correlation. Polarized nuclei.

doi: 10.1023/A:1012665917625
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1999SC17      Phys.Rev.Lett. 82, 4787 (1999)

P.Schuurmans, J.Camps, P.De Moor, K.Freitag, P.Herzog, M.Huyse, R.Paulsen, N.Severijns, A.Van Geert, P.Van Duppen, B.Will, and the NICOLE and ISOLDE Collaborations

Angular Distributions of α Particles Emitted by Deformed Oriented Nuclei

RADIOACTIVITY 221Fr(α) [from 221Rn decay following Th(p, X)]; 227,229Pa(α) [from 232Th(p, xn)]; measured Eα, Iα(θ) from oriented nuclei; deduced anisotropy, deformation effects. Mass-separated sources.

doi: 10.1103/PhysRevLett.82.4787
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1998BR23      Yad.Fiz. 61, No 8, 1395 (1998); Phys.Atomic Nuclei 61, 1293 (1998)

Ch.Briancon, V.B.Brudanin, J.Deutsch, V.G.Egorov, T.V.Filipova, J.Govaerts, C.Petitjean, R.Prieels, N.Severijns, Yu.A.Shitov, V.Vorobel, Ts.Vylov, V.Wiaux, I.A.Yutlandov, Sh.Zaparov

Experiment AnCor: Search for scalar interaction in β decay and μ capture

RADIOACTIVITY 14O, 18Ne(β+); measured βγ-coin, βγ(θ); deduced β-ν angular correlation.

NUCLEAR REACTIONS 16O(μ, ν), E not given; measured Doppler-shifted Eγ, Iγ; deduced correlation coefficient.


1998KR23      Phys.Rev. C58, 3181 (1998)

J.Krause, I.Berkes, J.Camps, M.De Jesus, P.De Moor, P.Herzog, M.Massaq, T.Phalet, P.Schuurmans, N.Severijns, A.Van Geert, D.Venos, B.Vereecke, B.Will, D.Zakoucky, and the NICOLE and ISOLDE Collaborations

α Particle Angular Distributions of 189, 191, 193Bi

RADIOACTIVITY 189,191,193Bi(α) [from Th(p, X), E=1 GeV]; measured Eα, Iα(θ) from oriented nuclei; deduced angular distribution parameters, mixing ratios, structure effects.

doi: 10.1103/PhysRevC.58.3181
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1998SE04      Nucl.Phys. A629, 423c (1998)

N.Severijns, M.Allet, K.Bodek, B.A.Brown, J.Camps, P.De Moor, J.Deutsch, M.Ferro-Luzzi, F.Gimeno-Nogues, J.Govaerts, B.R.Holstein, R.Kirchner, J.Lang, R.Muller, S.Navert, O.Naviliat-Cuncic, T.Otto, I.Pepe, R.Prieels, P.A.Quin, P.Schuurmans, J.Sromicki, E.Stephan, E.Thomas, A.Van Geert, L.Vanneste, B.Vereecke, J.Zejma

Helicity Structure in Low- and Intermediate-Energy Weak Interaction

RADIOACTIVITY 12N, 107In(β+); measured β+ polarization asymmetry from decay of polarized nuclei; deduced weak interaction helicity structure features, W gauge boson mass lower limit.

doi: 10.1016/S0375-9474(97)00719-7
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1998VA22      Yad.Fiz. 61, No 8, 1376 (1998); Phys.Atomic Nuclei 61, 1274 (1998)

A.Van Geert, P.De Moor, W.Belmans, T.Phalet, P.Schuurmans, N.Severijns, L.Vanneste, B.Vereecke, M.Glugla

Results of the First Nuclear-Orientation Experiment on 3H

RADIOACTIVITY 3H(β-); measured Eβ, Iβ(H, θ); deduced asymmetry coefficient.


1997EG02      Nucl.Phys. A621, 745 (1997)

V.Egorov, Ch.Briancon, V.Brudanin, J.Dionisio, J.Deutsch, V.Gorozhankin, Yu.Gurov, R.Prieels, V.Sandukovsky, N.Severijns, M.Simoes, Yu.Shitov, Ch.Vieu, V.Vorobel, Ts.Vylov, I.Yutlandov, Sh.Zaparov

Beta-Neutrino Angular Correlation in the Decay of 18Ne

RADIOACTIVITY 18Ne(β+); measured βγ-coin, βγ(θ), Iγ(θ); deduced Doppler shift, parameter C(s)/C(v). Source from 3He bombardment of B2O3 thin foil.

doi: 10.1016/S0375-9474(97)00178-4
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1997SC26      Z.Phys. A358, 239 (1997)

P.Schuurmans, B.Will, I.Berkes, J.Camps, M.De Jesus, P.De Moor, P.Herzog, M.Lindroos, R.Paulsen, N.Severijns, A.Van Geert, P.Van Duppen, L.Vanneste, and the NICOLE and ISOLDE Collaboration

The Angular Distributions of α-Particles Emitted by Oriented Nuclei and Their Relation to Nuclear Structure and Deformation

RADIOACTIVITY 205,207,209,211At(α); 205,207,209Rn(α); 221Fr(α); 227,229Pa(α); measured Iα(θ), oriented nuclei; deduced structure, deformation roles. Low-temperature nuclear orientation, different models .

doi: 10.1007/s002180050318
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1996AL23      Phys.Lett. 383B, 139 (1996)

M.Allet, K.Bodek, J.Camps, J.Deutsch, M.Ferro-Luzzi, F.Gimeno-Nogues, J.Govaerts, J.Lang, R.Muller, S.Navert, O.Naviliat-Cuncic, I.Pepe, R.Prieels, P.Quin, N.Severijns, J.Sromicki, E.Stephan, E.Thomas, J.Zejma

Search for Right-Handed Weak Currents in the β-Asymmetry-Polarization Correlation from 12N Decay

RADIOACTIVITY 12N(β+); measured β+ polarization, polarized source; deduced right-handed gauge boson mass lower limit.

doi: 10.1016/0370-2693(96)00724-1
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1996SC35      Phys.Rev.Lett. 77, 4720 (1996)

P.Schuurmans, B.Will, I.Berkes, J.Camps, M.De Jesus, P.De Moor, P.Herzog, M.Lindroos, R.Paulsen, N.Severijns, A.Van Geert, P.Van Duppen, L.Vanneste, and the NICOLE and ISOLDE Collaborations

Alpha-Particle Angular Distributions of At and Rn Isotopes and Their Relation to Nuclear Structure

RADIOACTIVITY 205,207,209Rn, 205,207,209,211,217At(α); measured α anisotropy vs temperature, oriented nuclei. 199,201,203At(α); analyzed α anisotropy data; deduced structure related features.

doi: 10.1103/PhysRevLett.77.4720
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1996TR12      Czech.J.Phys. B46, 2207 (1996)

M.Trhlik, P.De Moor, P.Pari, M.Rotter, N.Severijns, A.Van Geert, L.Vanneste

Low-Temperature Nuclear Orientation of 160Tb in Tb/Fe Multilayers

RADIOACTIVITY 160Tb(β-); measured Iγ(θ), nuclear orientation at low temperature; deduced Tb magnetic moments perpendicular magnetic anisotropy features in Tb/Fe multilayers.

doi: 10.1007/BF02571095
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1995VA27      Phys.Rev.Lett. 75, 641 (1995)

W.Vanderpoorten, J.Camps, P.De Moor, M.Gaelens, P.Schuurmans, N.Severijns, L.Vanneste, J.Wouters

In-Beam Polarization of Light Radioactive Nuclei Using Grazing Surface Scattering

RADIOACTIVITY 13N(β+); measured β asymmetry following beam implantation in Pt; deduced beam polarization.

doi: 10.1103/PhysRevLett.75.641
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1995VE09      Nucl.Instrum.Methods Phys.Res. A365, 419 (1995)

D.Venos, D.Srnka, J.Slesinger, D.Zakoucky, J.Stehno, N.Severijns, A.Van Geert

Performance of HPGe Detectors in the Temperature Region

RADIOACTIVITY 207Bi(EC), (β+); measured I(ce), γ spectra; deduced detector characteristics. Planar hyperpure Ge detectors, low temperature.

doi: 10.1016/0168-9002(95)00510-2
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1993SE03      Nucl.Phys. A553, 827c (1993)

N.Severijns, M.Allet, J.Camps, P.De Moor, J.Deutsch, F.Gimeno-Nogues, B.R.Holstein, B.H.King, O.Naviliat-Cuncic, I.Pepe, R.Prieels, P.A.Quin, P.Schuurmans, R.Siebelink, W.Vanderpoorten, J.Vanhaverbeke, L.Vanneste, J.Wouters

Bounds on Right-Handed Currents from a Relative β-Polarization Measurement with Polarized 107In

RADIOACTIVITY 107In(β+), (EC) [from Mo(14N, X), E=120 MeV]; measured β+ longitudinal polarization; deduced W-gauge boson mass limit implications.

doi: 10.1016/0375-9474(93)90705-3
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1993SE06      Phys.Rev.Lett. 70, 4047 (1993)

N.Severijns, J.Deutsch, F.Gimeno-Nogues, B.H.King, I.Pepe, R.Prieels, P.A.Quin, J.Camps, P.De Moor, P.Schuurmans, W.Vanderpoorten, L.Vanneste, J.Wouters, M.Allet, O.Naviliat-Cuncic, B.R.Holstein

Limits on Right-Handed Charged Weak Currents from a Polarization-Asymmetry Correlation Experiment with 107In

RADIOACTIVITY 107In(EC), (β+) [from Mo(14N, X), E=120 MeV]; measured β+ longitudinal polarization with respect to source polarization; deduced standard model extensions constraints, charged W gauge boson mass lower limit. Polarized source.

doi: 10.1103/PhysRevLett.70.4047
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1993SE15      Hyperfine Interactions 78, 91 (1993)

N.Severijns, R.Prieels, M.Allet, J.Camps, P.De Moor, J.Deutsch, F.Gimeno-Nogues, B.R.Holstein, B.H.King, O.Naviliat-Cuncic, I.Pepe, P.A.Quin, P.Schuurmans, R.Siebelink, W.Vanderpoorten, J.Vanhaverbeke, L.Vanneste, J.Wouters

Study of the Violation of Parity in Nuclear β-Decay via a Relative β-Polarization Measurement with the Polarized 107In Nuclei

RADIOACTIVITY 107In(EC), (β+); measured β+ longitudinal polarization, polarized source; deduced mass lower limit for predominantly right-handed charged W gauge boson.

doi: 10.1007/BF00568121
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1993TR09      Hyperfine Interactions 78, 505 (1993)

M.Trhlik, P.De Moor, A.L.Erzinkyan, G.M.Gurevich, V.P.Parfenova, P.Schuurmans, N.Severijns, W.Vanderpoorten, L.Vanneste, J.Wouters

Noncollinearity of Mn Spin in Ferromagnetic (Pt)Fe Alloy: A nuclear orientation study

RADIOACTIVITY 54Mn(EC); measured γ(θ), oriented nuclei, low temperature; deduced Mn spin noncollinearity in ferromagnetic PtFe alloy.

doi: 10.1007/BF00568183
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1992CA12      J.Phys.(London) G18, 823 (1992)

A.S.Carnoy, J.Deutsch, R.Prieels, N.Severijns, P.A.Quin

Is There an Indication for the Existence of Right-Handed Weak Currents in Nuclear Beta Decay ( Question )

RADIOACTIVITY 14O, 42Sc, 1n; calculated β-decay ft; 1n, 19Ne; analyzed decay data; deduced right handed weak gauge boson evidence, mass estimate. Left-right symmetric models.

doi: 10.1088/0954-3899/18/5/011
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1992DE54      Hyperfine Interactions 75, 439 (1992)

J.K.Deng, J.H.Hamilton, A.V.Ramayya, W.C.Ma, X.W.Zhao, J.Kormicki, N.Severijns, L.Vanneste, W.D.Hamilton, P.F.Mantica, Jr., H.K.Carter

On-Line Nuclear Orientation of 70As

RADIOACTIVITY 70As(β+), (EC); measured γ-anistropy. 70Ge deduced transitions δ, symmetry features. On-line nuclear orientation.

doi: 10.1007/BF02399001
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1992SC26      Hyperfine Interactions 75, 423 (1992)

P.Schuurmans, J.Wouters, P.De Moor, N.Severijns, W.Vanderpoorten, J.Vanhaverbeke, L.Vanneste

Anisotropic Alpha-Emission in the 223Ra Decay Chain

RADIOACTIVITY 223Ra(α); 219Rn(α) [from 223Ra(α-decay)]; 215Po(α) [from 219Rn(α-decay)]; 211Bi(α), (β-) [from 211Pb(β-) following 215Po-decay]; measured Eα, Iα, Eγ, Iγ, α-anisotropy. High resolution α-detection, low temperature nuclear orientation.

doi: 10.1007/BF02398999
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1992SE10      Hyperfine Interactions 75, 181 (1992)

N.Severijns, R.Prieels, J.Deutsch, F.Gimeno-Nogues, I.Pepe, P.A.Quin, P.De Moor, P.Schuurmans, R.Siebelink, W.Vanderpoorten, J.Vanhaverbeke, L.Vanneste, J.Wouters, M.Allet, O.Naviliat-Cuncic

The Polarization-Asymmetry Correlation of 107In and Parity Violation

RADIOACTIVITY 107In(β+); measured β+-spectra, asymmetry; deduced longitudinal polarization.

doi: 10.1007/BF02398975
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1992VA17      Hyperfine Interactions 75, 331 (1992)

W.Vanderpoorten, P.De Moor, P.Schuurmans, R.Siebelink, L.Vanneste, J.Wouters, N.Severijns, J.Vanhaverbeke, R.Eder, H.Haas, and the NICOLE and ISOLDE Collaborations

The Hyperfine Filed of Sodium in Iron

RADIOACTIVITY 24Na(β-); measured β-, γ-anisotropies; deduced hyperfine field, relaxation time upper limit in Fe. Low temperature nuclear orientation.

doi: 10.1007/BF02398990
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1992WO14      Hyperfine Interactions 75, 381 (1992)

J.Wouters, P.De Moor, P.Schuurmans, N.Severijns, W.Vanderpoorten, L.Vanneste

Particle Detection from Oriented Nuclei

COMPILATION 241Am, 253Es, 227,226Pa, 226Th; compiled, reviewed α-spectra data. Cryogenically oriented nuclei.


1991LI32      Nucl.Phys. A533, 292 (1991)

J.Liechti, M.Allet, A.Converse, J.Deutsch, F.Gimeno-Nogues, J.Lang, H.Luscher, R.Muller, O.Naviliat-Cuncic, R.Prieels, P.A.Quin, N.Severijns, J.Sromicki

Production of Polarized 12N with the 12C(p(pol), 12N(pol))n0 Reaction

NUCLEAR REACTIONS 12C(polarized p, 12N), E=50, 72 MeV; measured polarization transfer coefficient vs θ. DWBA analysis.

RADIOACTIVITY 12N [from 12C(polarized p, 12N), E=50, 72 MeV]; measured β-decay asymmetry.

doi: 10.1016/0375-9474(91)90491-N
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1991NA05      J.Phys.(London) G17, 919 (1991)

O.Naviliat-Cuncic, T.A.Girard, J.Deutsch, N.Severijns

Left-Right Symmetry Breaking Sensitivity of β-Asymmetry Measurements

RADIOACTIVITY 13N, 17F, 35Ar, 29P, 31S; analyzed decay data; deduced β-asymmetry parameters limits, left-right symmetry breaking role. Other nuclei considered.

doi: 10.1088/0954-3899/17/6/013
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1991WO04      J.Phys.(London) G17, 1673 (1991)

J.Wouters, N.Severijns, J.Vanhaverbeke, L.Vanneste

Magnetic Moments of Po Isotopes and the Quenching of Nuclear Magnetism in the 208Pb Region

RADIOACTIVITY 199m,201m,201,203Po [from Re(20Ne, xnp)]; measured γ(θ), α(θ), oriented nuclei; deduced μ.

doi: 10.1088/0954-3899/17/11/014
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1990DU06      Hyperfine Interactions 59, 497 (1990)

J.Dupak, S.Kapusta, J.Kuriplach, B.Sedlak, N.Severijns, M.Trhlik, W.Vanderpoorten, J.Vanhaverbeke, L.Vanneste, M.Vobecky, J.Wouters

Nuclear Orientation Study of 160Tb Impurity in Gadolinium Single Crystal

RADIOACTIVITY 160Tb; measured γ-anisotropy, oriented nuclei. Source as impurity in Gd single crystal.


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