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NSR database version of April 11, 2024.

Search: Author = I.S.Towner

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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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2020HA30      Phys.Rev. C 102, 045501 (2020)

J.C.Hardy, I.S.Towner

Superallowed O+ → O+ nuclear β decays: 2020 critical survey, with implications for Vud and CKM unitarity

RADIOACTIVITY 10C, 14O, 18Ne, 22Mg, 26Si, 30S, 34Ar, 38Ca, 42Ti, 46Cr, 50Fe, 54Ni, 26mAl, 34Cl, 38mK, 42Sc, 46V, 50Mn, 54Co, 62Ga, 66As, 70Br, 74Rb(β+), (EC); compiled and evaluated Q(ϵ), T1/2, β decay branching ratios, γ-intensity ratios for superallowed (0+ to 0+) β decays in Tz=-1 and 0 parent nuclei; deduced partial half-lives, ft and Ft for superallowed Fermi decays, Cabibbo-Kobayashi-Maskawa matrix Vud, upper limit on Fierz interference. Discussed CKM unitarity test.

doi: 10.1103/PhysRevC.102.045501
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2020IA02      Phys.Rev. C 101, 045501 (2020)

V.E.Iacob, J.C.Hardy, H.I.Park, M.Bencomo, L.Chen, V.Horvat, N.Nica, B.T.Roeder, A.Saastamoinen, I.S.Towner

Precise β branching-ratio measurement for the 0+ → 0+ superallowed decay of 34Ar

RADIOACTIVITY 34Ar(β+), (EC)[from 1H(35Cl, 2n), E=30 MeV/nucleon, followed by separation of fully stripped reaction ejectiles using the MARS spectrometer at the K500 superconducting cyclotron at Texas A and M University]; measured Eβ+, Iβ+, Eγ, Iγ, β+γ-coin. 34Cl; deduced levels, J, π, β-branching ratio, EC to β+ emission ratios, logft, superallowed 0+ to 0+ β transition, isospin-symmetry-breaking correction, ratios of ft values for the mirror pair of superallowed transitions 34Ar to 34Cl and 34Cl to 34S. Comparison with previous experimental data, and with shell model calculations with Woods-Saxon radial wave functions. Systematics of logft ratios in A=26, 34, 38 and 42 mirror pairs. Relevance to up-down quark-mixing element Vud of the Cabibbo-Kobayashi-Maskawa matrix.

doi: 10.1103/PhysRevC.101.045501
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2020PA40      Phys.Rev. C 102, 045502 (2020)

H.I.Park, J.C.Hardy, M.Bencomo, V.E.Iacob, I.S.Towner, K.T.Macon, W.P.Tan, M.Brodeur, A.Boeltzig, B.Frentz, S.L.Henderson, J.Long, S.McGuinness, O.Olivas-Gomez, P.O'Malley, G.Seymour, B.Vande Kolk, A.Kayani

Intensity of a weak 519-keV γ ray following β decay of the superallowed emitter 34Ar determined via the 33S(p, γ)34Cl reaction

NUCLEAR REACTIONS 33S(p, γ)34Cl, E=1072 keV; measured Eγ, Iγ, and γγ-coin using GEORGINA array of five Ge detectors at the Pelletron accelerator of University of Notre Dame. 34Cl; deduced γ-branching ratios from the 666-keV level, in particular for the 519-keV γ ray following β+ decay of the superallowed emitter 34Ar. Comparison of the branching ratios with previous experimental results, and theoretical calculations.

doi: 10.1103/PhysRevC.102.045502
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2019BE23      Phys.Rev. C 100, 015503 (2019)

M.Bencomo, J.C.Hardy, V.E.Iacob, H.I.Park, L.Chen, V.Horvat, N.Nica, B.T.Roeder, A.Saastamoinen, I.S.Towner

Precise branching ratio measurement for the superallowed β+ decay of 26Si: Completion of a second mirror pair

RADIOACTIVITY 26Si(β+), (EC)[from 1H(27Al, 2n), E=30 MeV/nucleon from the Texas A and M University K500 superconducting cyclotron, followed by analysis of reaction products by MARS system according to A/Q ratio]; measured β+ particles, Eγ, Iγ, β+γ-coin using plastic scintillator for β+ detection and HPGe detector for γ detection. 26Al; deduced levels, β++ϵ branching ratios, Gamow-Teller branches, superallowed (0+ to 0+) decay branch, logft, Ft. Comparison with sd shell-model calculations using USD, USD-A, and USD-B effective interactions. Discussed relevance to determination of up-down Vud quark-mixing element of the Cabibbo-Kobayashi-Maskawa matrix.

doi: 10.1103/PhysRevC.100.015503
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2018GA22      Acta Phys.Pol. B49, 229 (2018)

P.E.Garrett, K.G.Leach, A.D.MacLean, G.C.Ball, P.C.Bender, V.Bildstein, B.A.Brown, C.Burbadge, A.Diaz Varela, R.Dunlop, T.Faestermann, B.Hadinia, R.Hertenberger, J.D.Holt, A.T.Laffoley, D.S.Jamieson, B.Jigmeddorj, A.J.Radich, E.T.Rand, S.R.Stroberg, C.E.Svensson, I.S.Towner, S.Triambak, H.-F.Wirth

Nuclear Structure Studied with Direct Reactions for Fundamental Symmetry Tests

NUCLEAR REACTIONS 52Cr(p, t)50Cr;64Zn(p, t)62Zn, E=24 MeV; measured reaction products momenta using Q3D magnetic spectrograph, Eγ, Iγ, γγ-coin; deduced peaks in triton spectra, σ(θ) vs θcm for reactions to given final states, angular correlation measurement of 1389-954 keV cascade in 62Zn following the β+/EC decay of 62Ga (preliminary).

doi: 10.5506/APhysPolB.49.229
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2016LE10      Phys.Rev. C 94, 011304 (2016)

K.G.Leach, P.E.Garrett, G.C.Ball, P.C.Bender, V.Bildstein, B.A.Brown, C.Burbadge, T.Faestermann, B.Hadinia, J.D.Holt, A.T.Laffoley, D.S.Jamieson, B.Jigmeddorj, A.J.Radich, E.T.Rand, S.R.Stroberg, C.E.Svensson, I.S.Towner, H.-F.Wirth

Searching for 0+ states in 50Cr: Implications for the superallowed β decay of 50Mn

NUCLEAR REACTIONS 52Cr(p, t), E=24 MeV; measured E(t), I(t), σ(θ) using Q3D magnetic spectrograph at MLL-Munich. 50Cr; deduced levels, J, π, L-transfers, 0+ states. Coupled-channel, finite-range DWBA analysis using software FRESCO code. Comparison with ab initio shell-model predictions using in-medium similarity renormalization group (IM-SRG) formalism based on NN and 3N forces from chiral-energy density functionals (EFT).Comparison with previous experimental results and evaluated data in the ENSDF database.

RADIOACTIVITY 50Mn(EC); discussed possible Fermi non-analog β transitions to 0+ states at 3895 and 4069 keV assigned in authors' (p, t) work.

doi: 10.1103/PhysRevC.94.011304
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2015HA07      Phys.Rev. C 91, 025501 (2015)

J.C.Hardy, I.S.Towner

Superallowed 0+ → 0+ nuclear β decays: 2014 critical survey, with precise results for Vud and CKM unitarity

RADIOACTIVITY 10C, 14O, 18Ne, 22Mg, 26Si, 30S, 34Ar, 38Ca, 42Ti, 26mAl, 34Cl, 38mK, 42Sc, 46V, 50Mn, 54Co, 62Ga, 66As, 70Br, 74Rb(β+), (EC); compiled and evaluated Q(ϵ), T1/2, branching ratios, γ-intensity ratios for superallowed (0+ to 0+) β transitions in Tz=-1 and 0 parent nuclei; deduced partial half-lives, ft, Ft, Vud, and δ'R, δNS, δC1, δC2, δC isospin symmetry breaking terms. Comparison with theoretical δC values from SM-WS (shell-model, Woods-Saxon), SM-HF (shell-model, Hartree-Fock), RPA (random phase approximation), IVMR (isovector monopole resonance), and DFT (density functional theory). Discussed CKM unitarity test, and Vus, Vab and Vu terms.

doi: 10.1103/PhysRevC.91.025501
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2015PA32      Phys.Rev. C 92, 015502 (2015)

H.I.Park, J.C.Hardy, V.E.Iacob, M.Bencomo, L.Chen, V.Horvat, N.Nica, B.T.Roeder, E.McCleskey, R.E.Tribble, I.S.Towner

Precise measurement of branching ratios in the β decay of 38Ca

RADIOACTIVITY 38Ca(β+), (EC)[from 1H(39K, 2n), E=30 MeV/nucleon]; measured fully-stripped reaction ejectiles using Momentum Achromat Recoil Spectrometer (MARS) at Texas A and M cyclotron facility, Eβ, Iβ, Eγ, Iγ, β+γ-coin. 38K; deduced levels, J, π, β+ branching ratios, logft values, branching ratio and Ft value for superallowed β transition, the up-down quark-mixing element of the Cabibbo-Kobayashi-Maskawa (CKM) matrix Vud. Comparison with shell-model calculations.

doi: 10.1103/PhysRevC.92.015502
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2015TO02      Phys.Rev. C 91, 015501 (2015)

I.S.Towner, J.C.Hardy

Parametrization of the statistical rate function for select superallowed transitions

RADIOACTIVITY 10C, 14O, 18Ne, 22Mg, 26Si, 26mAl, 30S, 34Ar, 34Cl, 38mK, 38Ca, 42Ti, 42Sc, 46V, 50Mn, 54Co, 62Ga, 66As, 70Br, 74Rb(β+), (EC); 11C, 13N, 15O, 17F, 19Ne, 21Na, 23Mg, 25Al, 27Si, 29P, 31S, 33Cl, 35Ar, 37K, 39Ca, 41Sc, 43Ti, 45V(β+), (EC); analyzed parametrizations of the statistical rate functions for 20 superallowed 0+ to 0+ β transitions between T=1 analog states, and for 18 superallowed mirror transitions between analog T=1/2 states. Application to determining Vud and testing CKM unitarity.

doi: 10.1103/PhysRevC.91.015501
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2015TO16      Phys.Rev. C 92, 055505 (2015)

I.S.Towner, J.C.Hardy

Theoretical corrections and world data for the superallowed ft values in the β decays of 42Ti, 46Cr, 50Fe, and 54Ni

RADIOACTIVITY 42Ti, 46Cr, 50Fe, 54Ni(β+), (EC); compiled, reviewed and evaluated experimental data for half-lives and β branching ratios; calculated Ft values, radiative and isospin-symmetry breaking corrections for the superallowed 0+ to 0+ Fermi transitions for Tz=-1 nuclei, and for similar data for the superallowed 0+ to 0+ β transitions in the β+, EC decay of daughter and mirror nuclides of 42Sc, 46V, 50Mn, 54Co with Tz=0; deduced parametrization for precise calculation of f values for the new superallowed transitions. Comparison with shell-model calculations.

doi: 10.1103/PhysRevC.92.055505
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2014HA08      Appl.Radiat.Isot. 87, 297 (2014)

J.C.Hardy, V.E.Iacob, H.I.Park, L.Chen, N.Nica, V.Horvat, R.E.Tribble, I.S.Towner

FT values measured to ±0.1 percent for superallowed beta transitions: Metrology at sub-second time scales

RADIOACTIVITY 10C, 14O, 22Mg, 26Al, 34Cl, 34Ar, 38K, 42Sc, 46V, 50Mn, 54Co, 62Ga, 74Rb(EC); measured decay products, Eβ, Iβ, Eγ, Iγ; deduced log ft, T1/2 and their uncertainties. Comparison with theoretical calculations.

doi: 10.1016/j.apradiso.2013.11.018
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2014PA09      Phys.Rev.Lett. 112, 102502 (2014)

H.I.Park, J.C.Hardy, V.E.Iacob, M.Bencomo, L.Chen, V.Horvat, N.Nica, B.T.Roeder, E.Simmons, R.E.Tribble, I.S.Towner

β Decay of 38Ca: Sensitive test of Isospin Symmetry-Breaking Corrections from Mirror Superallowed 0+ → 0+ Transitions

RADIOACTIVITY 38Ca, 38K(β+) [from 1H(39K, 2n)38Ca, E=30 MeV/nucleon]; measured decay products, Eγ, Iγ; deduced branching ratio, high-precision log ft value. Test of the isospin symmetry-breaking corrections, comparison with available data.

doi: 10.1103/PhysRevLett.112.102502
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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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2013DU14      Phys.Rev. C 88, 045501 (2013)

R.Dunlop, G.C.Ball, J.R.Leslie, C.E.Svensson, I.S.Towner, C.Andreoiu, S.Chagnon-Lessard, A.Chester, D.S.Cross, P.Finlay, A.B.Garnsworthy, P.E.Garrett, J.Glister, G.Hackman, B.Hadinia, K.G.Leach, E.T.Rand, K.Starosta, E.R.Tardiff, S.Triambak, S.J.Williams, J.Wong, S.W.Yates, E.F.Zganjar

High-precision branching-ratio measurement for the superallowed Β+ emitter 74Rb

RADIOACTIVITY 74Rb(β+), (EC)[from Nb(p, X, ), E=500 MeV]; measured Eγ, Iγ, Eβ, Iβ, ce, γγ-, γ(ce)-, βγ-, β(ce)-coin using 8π array for γ rays, SCEPTAR for β particles and PACES for conversion electrons at ISAC-TRIUMF facility. 74Kr; deduced levels, J, π, conversion coefficients, multipolarity, E0 transition, branching ratio for superallowed β transition, logft, GT+F, isospin-symmetry breaking terms. Comparison of experimental GT values with theoretical values.

doi: 10.1103/PhysRevC.88.045501
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2013LE19      Phys.Rev. C 87, 064306 (2013); Pub.Note Phys.Rev. C 87, 069904 (2013)

K.G.Leach, P.E.Garrett, I.S.Towner, G.C.Ball, V.Bildstein, B.A.Brown, G.A.Demand, T.Faestermann, P.Finlay, K.L.Green, R.Hertenberger, R.Krucken, A.A.Phillips, E.T.Rand, C.S.Sumithrarachchi, C.E.Svensson, S.Triambak, H.-F.Wirth, J.Wong

Experimental 64Zn((d-pol), t)63Zn spectroscopic factors: Guidance for isospin-symmetry-breaking calculations

NUCLEAR REACTIONS 64Zn(polarized d, t), E=22 MeV; measured triton spectra, σ(θ) and vector analyzing powers using Q3D magnetic spectrograph at MLL, Munich facility. DWBA analyses using several optical model parameters. 63Zn; deduced levels, L-transfers, J, π, spectroscopic factors. Comparison with shell-model calculations with GXPF1A interaction. Comparison with experimental and theoretical spectroscopic factors for 62Zn(d, t)61Zn reaction. Discussed implications for isospin symmetry breaking (ISB) calculations for 62Ga to 62Zn superallowed β decay.

doi: 10.1103/PhysRevC.87.064306
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2013LE25      Phys.Rev. C 88, 031306 (2013)

K.G.Leach, P.E.Garrett, C.E.Svensson, I.S.Towner, G.C.Ball, V.Bildstein, B.A.Brown, A.Diaz Varela, R.Dunlop, T.Faestermann, R.Hertenberger, D.J.Jamieson, R.Krucken, S.Triambak, H.-F.Wirth

Excited O+ states in 62Zn populated via the 64Zn(p, t)62Zn reaction

NUCLEAR REACTIONS 64Zn(p, t), E=24 MeV; measured triton spectra, σ(θ) using Q3D magnetic spectrograph at MLL-Munich facility. DWBA analysis of σ(θ) data. 62Zn; deduced levels, J, π, l-transfer, excited 0+ states. Comparison with shell-model calculations using MSDI3, GXPF1 and GXPF1A interactions. Discussed impact on isospin-symmetry-breaking (ISB) correction for 62Ga superallowed due to shift in the first excited 0+ state in 62Zn.

doi: 10.1103/PhysRevC.88.031306
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2012HA46      J.Phys.:Conf.Ser. 387, 012006 (2012)

J.C.Hardy, I.S.Towner

Superallowed 0+ → 0+ beta-decay from Tz = -1 sd-shell nuclei

RADIOACTIVITY 34Ar(β+), (EC)[from 1H(35Cl, 2n)]; measured positron β decay, Eγ, Iγ, (e+)γ-coin. 18Ne, 22Mg, 26Si, 30S, 34Ar, 38Ca, 42Ti(EC), (β+); calculated superallowed 0+ TO 0+ transitions from TZ=-1 parent nuclei branching ratios.

doi: 10.1088/1742-6596/387/1/012006
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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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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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2012ME03      Phys.Rev. C 85, 025501 (2012)

D.Melconian, S.Triambak, C.Bordeanu, A.Garcia, J.C.Hardy, V.E.Iacob, N.Nica, H.I.Park, G.Tabacaru, L.Trache, I.S.Towner, R.E.Tribble, Y.Zhai

β decay of 32Cl: Precision γ-ray spectroscopy and a measurement of isospin-symmetry breaking

RADIOACTIVITY 32Cl(β+), (EC)[20 MeV/nucleon 32Cl secondary beam from 1H(32S, n), E AP 24.8 MeV/nucleon primary reaction using MARS facility]; measured particle spectra, Eγ, Iγ, β, βγ-coin, half-life; deduced mass excess, Q(EC). 32S; deduced levels, J, π, isospin, β branches, logft, Gamow-Teller matrix elements, isospin-symmetry-breaking correction for superallowed transition. Comparison with earlier studies and shell-model calculation. 30S, 32Cl(β+); measured half-lives from γ-decay curves.

doi: 10.1103/PhysRevC.85.025501
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2012OH01      Phys.Rev.Lett. 109, 032504 (2012)

T.Ohtsubo, N.J.Stone, J.R.Stone, I.S.Towner, C.R.Bingham, C.Gaulard, U.Koster, S.Muto, J.Nikolov, K.Nishimura, G.S.Simpson, G.Soti, M.Veskovic, W.B.Walters, F.Wauters

Magnetic Dipole Moment of the Doubly-Closed-Shell Plus One Proton Nucleus 49Sc

NUCLEAR MOMENTS 49Sc; measured hyperfine field, β asymmetry; deduced magnetic dipole moment. Comparison with available data.

NUCLEAR STRUCTURE 41,49Sc; calculated magnetic dipole moment.

doi: 10.1103/PhysRevLett.109.032504
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2011LE47      J.Phys.:Conf.Ser. 312, 092036 (2011)

K.G.Leach, P.E.Garrett, G.C.Ball, J.C.Bangay, L.Bianco, G.A.Demand, T.Faestermann, P.Finlay, K.L.Green, R.Hertenberger, R.Kriicken, A.A.Phillips, E.T.Rand, C.S.Sumithrarachchi, C.E.Svensson, I.S.Towner, S.Triambak, H.-F.Wirth, J.Wong

Experimental Guidance of ISB Corrections via Direct Nuclear Reactions

NUCLEAR REACTIONS 64Zn(polarized d, d), (polarized d, t), E=22 MeV; measured Ep, Ip(θ), E(triton), I(triton, θ) using Q3D magnetic spectrograph; deduced elastic scattering σ(θ), vector analyzing power; calculated elastic scattering σ(θ), vector analyzing power using DWBA with isospin-symmetry breaking corrections and deuteron parameters from literature.

doi: 10.1088/1742-6596/312/9/092036
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2011ME15      Phys.Rev.Lett. 107, 182301 (2011)

D.Melconian, S.Triambak, C.Bordeanu, A.Garcia, J.C.Hardy, V.E.Iacob, N.Nica, H.I.Park, G.Tabacaru, L.Trache, I.S.Towner, R.E.Tribble, Y.Zhai

Experimental Validation of the Largest Calculated Isospin-Symmetry-Breaking Effect in a Superallowed Fermi Decay

RADIOACTIVITY 32Cl(EC); measured decay products, Eγ, Iγ; deduced γ yield to its isobaric-analogue branch, log ft, large isospin-symmetry breaking. Comparison with shell model calculations.

doi: 10.1103/PhysRevLett.107.182301
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2010HA34      Nucl.Phys. A844, 138c (2010)

J.C.Hardy, I.S.Towner

Superallowed nuclear β decay: symmetry breaking, CVC and CKM unitarity

doi: 10.1016/j.nuclphysa.2010.05.024
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2010TO12      Phys.Rev. C 82, 065501 (2010)

I.S.Towner, J.C.Hardy

Comparative tests of isospin-symmetry-breaking corrections to superallowed 0+ → 0+ nuclear β decay

NUCLEAR STRUCTURE 10C, 14O, 22Mg, 26Al, 34Cl, 34Ar, 38K, 42Sc, 46V, 50Mn, 54Co, 62Ga, 74Rb(β+); analyzed isospin-symmetry-breaking correction for superallowed 0+ to 0+ β transitions using shell model with Saxon-Woods radial wave functions.

doi: 10.1103/PhysRevC.82.065501
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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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2009BE22      Phys.Rev. C 79, 064305 (2009)

J.S.Berryman, K.Minamisono, W.F.Rogers, B.A.Brown, H.L.Crawford, G.F.Grinyer, P.F.Mantica, J.B.Stoker, I.S.Towner

Doubly-magic nature of 56Ni: Measurement of the ground state nuclear magnetic dipole moment of 55Ni

RADIOACTIVITY 55Ni(β+)[from 9Be(58Ni, X), E=160 MeV/nucleon];measured β asymmetry from spin polarized 55Ni ions, deduced g-factor.

NUCLEAR MOMENTS 55Ni; measured g-factor by β-NMR method; deduced magnetic moment. 55Ni, 55Co; comparison of measured magnetic moments with shell-model calculations in full fp shell using GXPF1 interaction.

doi: 10.1103/PhysRevC.79.064305
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2009HA12      Phys.Rev. C 79, 055502 (2009)

J.C.Hardy, I.S.Towner

Superallowed 0+ → 0+ nuclear Β decays: A new survey with precision tests of the conserved vector current hypothesis and the standard model

RADIOACTIVITY 10C, 14O, 18Ne, 22Mg, 26Si, 30S, 34Ar, 38Ca, 42Ti, 26mAl, 34Cl, 38mK, 42Sc, 46V, 50Mn, 54Co, 62Ga, 66As, 70Br, 74Rb(EC), (β+); analyzed Q values, half-lives and branching ratios; deduced statistical rate function (Ft). Precision test of conserved vector current hypothesis and the standard model.

doi: 10.1103/PhysRevC.79.055502
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2009HA16      Acta Phys.Pol. B40, 675 (2009)

J.C.Hardy, I.S.Towner

Superallowed Beta Decay: the Role of Nuclear Structure in Standard-Model Tests


2008FI07      Phys.Rev. C 78, 025502 (2008)

P.Finlay, G.C.Ball, J.R.Leslie, C.E.Svensson, I.S.Towner, R.A.E.Austin, D.Bandyopadhyay, A.Chaffey, R.S.Chakrawarthy, P.E.Garrett, G.F.Grinyer, G.Hackman, B.Hyland, R.Kanungo, K.G.Leach, C.M.Mattoon, A.C.Morton, C.J.Pearson, A.A.Phillips, J.J.Ressler, F.Sarazin, H.Savajols, M.A.Schumaker, J.Wong

High-precision branching ratio measurement for the superallowed β+ emitter 62Ga

RADIOACTIVITY 62Ga(β+); measured Eγ, Iγ, Eβ, βγ-coin, branching ratios; deduced ft values. 62Zn; deduced levels, J, π. 10C, 14O, 22Mg, 26mAl, 34Cl, 34Ar, 38mK, 42Sc, 46V, 50Mn, 54Co, 62Ga, 74Rb; systematics of superallowed β decays and ft values.

doi: 10.1103/PhysRevC.78.025502
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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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2008TO03      Phys.Rev. C 77, 025501 (2008)

I.S.Towner, J.C.Hardy

Improved calculation of the isospin-symmetry-breaking corrections to superallowed Fermi β decay

NUCLEAR REACTIONS 46Ti(3He, α), E not given; analyzed spectroscopic factors.

RADIOACTIVITY 10C, 14O, 22Mg, 26,26mAl, 34Ar, 34Cl, 38,38mK, 42Sc, 46V, 50Mn, 54Co, 62Ga, 74Rb; calculated isotopic mixing correction; analyzed ft values for superallowed β decay. 26Si, 30S, 38Ca, 42Ti, 66As, 70Br; calculated isospin mixing correction.

doi: 10.1103/PhysRevC.77.025501
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2007ZG01      Acta Phys.Pol. B38, 1179 (2007)

E.F.Zganjar, T.Achtzehn, D.Albers, C.Andreoiu, A.N.Andreyev, R.A.E.Austin, G.C.Ball, J.A.Behr, G.C.Biosvert, P.Bricault, S.Bishop, R.S.Chakrawarthy, R.Churchman, D.Cross, E.Cunningham, J.M.D'Auria, M.Dombsky, P.Finlay, P.E.Garrett, G.F.Grinyer, G.Hackman, V.Hanemaayer, J.C.Hardy, D.F.Hodgson, B.Hyland, V.Iacob, P.Klages, K.A.Koopmans, W.D.Kulp, J.Lassen, J.P.Lavoie, J.R.Leslie, T.Linder, J.A.Macdonald, H.-B.Mak, D.Melconian, A.C.Morton, W.E.Ormand, C.J.Osborne, C.J.Pearson, M.R.Pearson, A.A.Phillips, A.Piechaczek, J.Ressler, F.Sarazin, G.Savard, M.A.Schumaker, H.C.Scraggs, C.E.Svensson, J.J.Valiente-Dobon, I.S.Towner, J.C.Waddington, P.M.Walker, K.Wendt, J.L.Wood

Superallowed Beta Decay Studies at TRIUMF - Nuclear Structure and Fundamental Symmetries


2006HA61      Int.J. Mass Spectrom. 251, 95 (2006)

J.C.Hardy, I.S.Towner, G.Savard

Mass measurements and superallowed β decay

NUCLEAR REACTIONS 24,25Mg(n, γ), E not given; 25Mg(p, γ), E not given; 26Mg, 27Al(p, γ), E not given; analyzed Q values and mass excess.

ATOMIC MASSES 46V, 46Ti, 26Al; reviewed masses. 24,26Mg, 26Al, 28Si; analyzed and evaluated masses. Comparison with Penning Trap measurements.

doi: 10.1016/j.ijms.2005.12.052
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2006HY02      Phys.Rev.Lett. 97, 102501 (2006)

B.Hyland, C.E.Svensson, G.C.Ball, J.R.Leslie, T.Achtzehn, D.Albers, C.Andreoiu, P.Bricault, R.Churchman, D.Cross, M.Dombsky, P.Finlay, P.E.Garrett, C.Geppert, G.F.Grinyer, G.Hackman, V.Hanemaayer, J.Lassen, J.P.Lavoie, D.Melconian, A.C.Morton, C.J.Pearson, M.R.Pearson, A.A.Phillips, M.A.Schumaker, M.B.Smith, I.S.Towner, J.J.Valiente-Dobon, K.Wendt, E.F.Zganjar

Precision Branching Ratio Measurement for the Superallowed β+ Emitter 62Ga and Isospin-Symmetry-Breaking Corrections in A ≥ 62 Nuclei

RADIOACTIVITY 62Ga(β+) [from Zr(p, X)]; measured Eγ, Iγ, βγ-coin; deduced superallowed Fermi branching ratio, ft. 62Zn deduced levels, J, π. Comparison with model predictions.

doi: 10.1103/PhysRevLett.97.102501
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2006IA02      Phys.Rev. C 74, 015501 (2006); Erratum Phys.Rev. C 74, 029901 (2006)

V.E.Iacob, J.C.Hardy, C.A.Gagliardi, J.Goodwin, N.Nica, H.I.Park, G.Tabacaru, L.Trache, R.E.Tribble, Y.Zhai, I.S.Towner

Branching ratios for the β decay of 21Na

RADIOACTIVITY 21Na(β+) [from 1H(22Ne, 2n)]; measured Eγ, Eγ, βγ-coin; deduced branching ratios. Implication for standard model test discussed.

doi: 10.1103/PhysRevC.74.015501
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2005BR12      Phys.Rev. C 71, 044317 (2005); Erratum Phys.Rev. C 72, 029901 (2005)

B.A.Brown, N.J.Stone, J.R.Stone, I.S.Towner, M.Hjorth-Jensen

Magnetic moments of the 2+1 states around 132Sn

NUCLEAR STRUCTURE 130Sn, 132Sb, 132,134Te; calculated levels, J, π. 124,126,128,130,134Sn, 130,132,134,136Te, 134,136,138Xe, 138Ba; calculated g factors, μ. Shell model, comparisons with data.

doi: 10.1103/PhysRevC.71.044317
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2005HA08      Phys.Rev.Lett. 94, 092502 (2005)

J.C.Hardy, I.S.Towner

New Limits on Fundamental Weak-Interaction Parameters from Superallowed β Decay

RADIOACTIVITY 10C, 14O, 22Mg, 26mAl, 34Cl, 34Ar, 38mK, 42Sc, 46V, 50Mn, 54Co, 74Rb; analyzed superallowed β-decay data; deduced limits on weak-interaction parameters.

doi: 10.1103/PhysRevLett.94.092502
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2005HA27      Phys.Rev. C 71, 055501 (2005)

J.C.Hardy, I.S.Towner

Superallowed 0+ → 0+ nuclear β decays: A critical survey with tests of the conserved vector current hypothesis and the standard model

RADIOACTIVITY 10C, 14O, 18Ne, 22Mg, 26Si, 30S, 34Ar, 38Ca, 42Ti, 26mAl, 34Cl, 38mK, 42Sc, 46V, 50Mn, 54Co, 62Ga, 66As, 70Br, 74Rb; compiled, analyzed superallowed β-decay decay Q(EC), T1/2, ft, branching ratios; deduced limits on weak-interaction parameters.

doi: 10.1103/PhysRevC.71.055501
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2005HA65      Eur.Phys.J. A 25, Supplement 1, 695 (2005)

J.C.Hardy, I.S.Towner

Superallowed 0+ → 0+ β decay and CKM unitarity: A new overview including more exotic nuclei

RADIOACTIVITY 10C, 14O, 18Ne, 22Mg, 26mAl, 26Si, 30S, 34Cl, 34Ar, 38mK, 38Ca, 42Sc, 42Ti, 46V, 50Mn, 54Co, 62Ga, 66As, 70Br, 74Rb(EC); analyzed superallowed decays log ft, related data; deduced limits on weak interaction parameters.

doi: 10.1140/epjad/i2005-06-109-x
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2005TO21      Phys.Rev. C 72, 055501 (2005)

I.S.Towner, J.C.Hardy

New analysis of 14O β decay: Branching ratios and conserved vector current consistency

RADIOACTIVITY 14O(β+); analyzed spectrum; deduced branching ratio for Gamow-Teller transition. 14C(β-); analyzed T1/2. Implication for conserved vector current hypothesis discussed.

doi: 10.1103/PhysRevC.72.055501
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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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2004SA53      Phys.Rev. C 70, 042501 (2004)

G.Savard, J.A.Clark, F.Buchinger, J.E.Crawford, S.Gulick, J.C.Hardy, A.A.Hecht, V.E.Iacob, J.K.P.Lee, A.F.Levand, B.F.Lundgren, N.D.Scielzo, K.S.Sharma, I.Tanihata, I.S.Towner, W.Trimble, J.C.Wang, Y.Wang, Z.Zhou

Q value of the superallowed decay of 22Mg and the calibration of the 21Na(p, γ) experiment

ATOMIC MASSES 18O, 22Mg, 22Na; measured masses. 22Mg deduced Q(EC), ft. Penning trap spectrometer.

doi: 10.1103/PhysRevC.70.042501
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2003ME08      Nucl.Instrum.Methods Phys.Res. B204, 540 (2003)

D.Melconian, D.Ashery, G.Ball, J.A.Behr, P.Bricault, B.A.Brown, M.Dombsky, K.P.Jackson, S.Fostner, A.Gorelov, M.N.Groves, S.Gu, M.R.Pearson, I.S.Towner, M.Trinczek, I.Vollrath

Measuring isospin mixing in 36Ar using a polarized, neutral atom trap

RADIOACTIVITY 37K(EC); measured β-asymmetry from polarized source. Optical pumping, application to planned experiment discussed.

doi: 10.1016/S0168-583X(02)02129-8
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2003PI08      Phys.Rev. C 67, 051305 (2003)

A.Piechaczek, E.F.Zganjar, G.C.Ball, P.Bricault, J.M.D'Auria, J.C.Hardy, D.F.Hodgson, V.Iacob, P.Klages, W.D.Kulp, J.R.Leslie, M.Lipoglavsek, J.A.Macdonald, H.-B.Mak, D.M.Moltz, G.Savard, J.von Schwarzenberg, C.E.Svensson, I.S.Towner, J.L.Wood

High precision branching ratio measurement for the superallowed β decay of 74Rb: A prerequisite for exacting tests of the standard model

RADIOACTIVITY 74Rb(EC) [from Nb(p, X)]; measured Eγ, Iγ, E(ce), I(ce); deduced analog transition branching ratio, QEC. 74Kr deduced levels, transitions.

doi: 10.1103/PhysRevC.67.051305
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2003TO29      J.Phys.(London) G29, 197 (2003)

I.S.Towner, J.C.Hardy

The evaluation of Vud, experiment and theory

RADIOACTIVITY 10C, 14O, 26mAl, 34Cl, 38mK, 42Sc, 46V, 50Mn, 54Co(EC); 1n(β-); compiled, analyzed superallowed decays Q-values, T1/2, log ft, related data; deduced Vud matrix element.

doi: 10.1088/0954-3899/29/1/321
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2002HA27      Phys.Rev.Lett. 88, 252501 (2002)

J.C.Hardy, I.S.Towner

Superallowed Beta Decay of Nuclei with A ≥ 62: The limiting effect of weak Gamow-Teller branches

RADIOACTIVITY 46V, 50Mn, 54Co, 62Ga, 66As, 70Br, 74Rb(EC); calculated Gamow-Teller branching fractions; deduced implications for superallowed decay measurements.

doi: 10.1103/PhysRevLett.88.252501
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2002HA47      Eur.Phys.J. A 15, 223 (2002)

J.C.Hardy, I.S.Towner

Superallowed 0+ → 0+ beta-decay and CKM unitarity: Recent results and future prospects

RADIOACTIVITY 10C, 14O, 26mAl, 34Cl, 38mK, 42Sc, 46V, 50Mn, 54Co(EC); analyzed superallowed decay log ft. Implication for unitarity test discussed.

doi: 10.1140/epja/i2001-10258-0
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2002TO19      Phys.Rev. C66, 035501 (2002)

I.S.Towner, J.C.Hardy

Calculated Corrections to Superallowed Fermi β Decay: New evaluation of the nuclear-structure-dependent terms

NUCLEAR STRUCTURE 10C, 14O, 18Ne, 22Mg, 26mAl, 26Si, 30S, 34Cl, 34Ar, 38mK, 38Ca, 42Sc, 42Ti, 46V, 50Mn, 54Co, 62Ga, 66As, 70Br, 74Rb; calculated radiative and isospin symmetry-breaking corrections to ft values in superallowed Fermi β decay.

doi: 10.1103/PhysRevC.66.035501
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2002ZG01      Eur.Phys.J. A 15, 229 (2002)

E.F.Zganjar, A.Piechaczek, G.C.Ball, P.Bricault, J.M.D'Auria, J.C.Hardy, D.F.Hodgson, V.Iacob, P.Klages, W.D.Kulp, J.R.Leslie, M.Lipoglavsek, J.A.Macdonald, H.B.Mak, D.M.Moltz, G.Savard, J.von Schwarzenberg, C.E.Svensson, I.S.Towner, J.L.Wood

Tests of the standard model from superallowed Fermi β-decay studies: The 74Rb β-decay

RADIOACTIVITY 74Rb(β+), (EC) [from Nb(p, X)]; measured Eγ, Iγ, E(ce), I(ce), βγ-, β(ce)-coin; deduced branching ratios. 74Kr deduced levels, transition intensities. Implications for standard model test discussed.

doi: 10.1140/epja/i2001-10259-y
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2001BA12      Phys.Rev.Lett. 86, 1454 (2001)

G.C.Ball, S.Bishop, J.A.Behr, G.C.Boisvert, P.Bricault, J.Cerny, J.M.D'Auria, M.Dombsky, J.C.Hardy, V.Iacob, J.R.Leslie, T.Lindner, J.A.Macdonald, H.-B.Mak, D.M.Moltz, J.Powell, G.Savard, I.S.Towner

Precise Half-Life Measurement for the Superallowed 0+ → 0+ β Emitter 74Rb: First results from the new radioactive beam facility (ISAC) at TRIUMF

RADIOACTIVITY 74Rb(β+) [from Nb(p, X)]; measured superallowed decay T1/2.

doi: 10.1103/PhysRevLett.86.1454
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2001HA65      Hyperfine Interactions 132, 115 (2001)

J.C.Hardy, I.S.Towner

Standard-Model Tests with Superallowed β-Decay: An important application of very precise mass measurements

doi: 10.1023/A:1011999930767
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2000HA17      Phys.Rev. C61, 044603 (2000)

A.C.Hayes, I.S.Towner

Shell-Model Calculations of Neutrino Scattering from 12C

NUCLEAR REACTIONS 12C(ν, μ-), (ν, e), (μ-, X), (γ, X), E not given; calculated σ. Shell model, comparisons with data.

doi: 10.1103/PhysRevC.61.044603
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2000RI14      Phys.Rev.Lett. 85, 1392 (2000)

J.Rikovska, T.Giles, N.J.Stone, K.van Esbroeck, G.White, A.Wohr, M.Veskovic, I.S.Towner, P.F.Mantica, J.I.Prisciandaro, D.J.Morrissey, V.N.Fedoseyev, V.I.Mishin, U.Koster, W.B.Walters, and the NICOLE and ISOLDE Collaborations

First On-Line Beta-NMR on Oriented Nuclei: Magnetic dipole moments of the (νp1/2)-11/2- Ground State in 67Ni and (πp3/2)+13/2- Ground State in 69Cu

NUCLEAR MOMENTS 67Ni, 69Cu; measured Eβ, Iβ(θ) from low-temperature oriented nuclei as a function of NMR frequency. 67Ni, 69Cu deduced μ. Comparison with core polarization plus meson-exchange current calculations.

RADIOACTIVITY 67Ni, 69Cu(β-) [from 238U(p, F), E=1 GeV]; measured Eβ, Iβ(θ) from low-temperature oriented nuclei as a function of NMR frequency. 67Ni, 69Cu deduced μ. Comparison with core polarization plus meson-exchange current calculations.

doi: 10.1103/PhysRevLett.85.1392
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1998JO09      Phys.Rev. C58, 1278 (1998)

G.Jonkmans, I.S.Towner, B.Sur

8Li Electron Spectrum Versus 8B Neutrino Spectrum: Implications for measuring solar neutrinos with a heavy water detector

RADIOACTIVITY 8Li(β-); analyzed electron spectrum recoil, radiative corrections; deduced solar neutrino measurement calibration features.

doi: 10.1103/PhysRevC.58.1278
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1998JO10      Eur.Phys.J. A 2, 263 (1998)

I.P.Johnstone, I.S.Towner

Effective charges for 88Sr and 90Zr Closed-Shell Cores

NUCLEAR STRUCTURE 87,89Sr, 90Y; calculated effective charges. 90,91Zr, 93Nb, 92,94,95,96,97,98,100Mo, 99Tc, 96,98,99,100,101,102Ru, 102,104Pd, 103,105,106Cd, 104,105In; calculated quadrupole moments in three model spaces. Comparisons with data.

doi: 10.1007/s100500050118
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1998JO17      Eur.Phys.J. A 3, 237 (1998)

I.P.Johnstone, I.S.Towner

Effective Magnetic Dipole Operators for 88Sr and 90Zr Closed-Shell Cores

NUCLEAR STRUCTURE 88Sr, 90Zr; calculated effective g-factors, magnetic dipole operators. 90,91Zr, 91,92Nb, 92,93Mo, 93,94Tc, 94,95Ru, 96Pd; calculated magnetic moments; deduced two-body core polarization, meson exchange current effects.

doi: 10.1007/s100500050173
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1998TO13      Phys.Rev. C58, 1288 (1998)

I.S.Towner

Radiative Corrections in Neutrino-Deuterium Scattering

NUCLEAR REACTIONS 2H(ν, pe), (ν, n), E=7-14 MeV; calculated radiative corrections; deduced implications for solar neutrino observation.

doi: 10.1103/PhysRevC.58.1288
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1998WH04      Nucl.Phys. A644, 277 (1998)

G.N.White, N.J.Stone, J.Rikovska, S.Ohya, J.Copnell, T.J.Giles, Y.Koh, I.S.Towner, B.A.Brown, B.Fogelberg, L.Jacobsson, P.Rahkila, M.Hjorth-Jensen

Magnetic Dipole Moments Near 132Sn: New measurement on 135I by NMR/ON

RADIOACTIVITY 135I(β-) [from 233U(n, F), E=thermal]; measured Iγ(θ, H, T), NMR on oriented nuclei. 135I deduced ground state g, μ. Shell model, core polarization, mesonic exchange currents.

NUCLEAR STRUCTURE 125,127,129,131,133Sb, 133,135I, 137Cs, 139La; calculated μ. Shell model.

doi: 10.1016/S0375-9474(98)00597-1
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1998WH05      Nucl.Phys. A640, 322 (1998)

G.White, J.Rikovska, N.J.Stone, J.Copnell, I.S.Towner, A.M.Oros, K.Heyde, B.Fogelberg, L.Jacobsson, F.Gustavsson

Magnetic Dipole Moments Near 132Sn: Measurement on isomeric 11/2- states in odd-A 131Te and 133Te by NMR/ON

RADIOACTIVITY 131,133Te(β-) [from 233U(n, F)]; measured Eγ, Iγ(θ, T, H), NMR on oriented nuclei. 131,133Te deduced isomeric states g, μ. Shell model, core polarization, mesonic exchange currents, particle-core coupling model.

doi: 10.1016/S0375-9474(98)00461-8
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1997HA04      Nucl.Phys. A613, 183 (1997)

E.Hagberg, I.S.Towner, J.C.Hardy, V.T.Koslowsky, G.Savard, S.Sterbenz

Beta Decay of 44V and 52Co

RADIOACTIVITY 44,44mV, 52Co(β+) [from 40Ca(6Li, 2n), E=35 MeV; 40Ca(14N, 2n), E= MeV]; measured Eγ, Iγ, T1/2, γββ-, γγβ-coin. 44Ti, 52Fe deduced level energies, branching ratios, ft values. Hyperpure Ge detectors, plastic scintillators.

doi: 10.1016/S0375-9474(96)00432-0
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1997HA32      Phys.Rev. C56, 135 (1997)

E.Hagberg, I.S.Towner, T.K.Alexander, G.C.Ball, J.S.Forster, J.C.Hardy, J.G.Hykawy, V.T.Koslowsky, J.R.Leslie, H.-B.Mak, I.Neeson, G.Savard

Measurement of the l-Forbidden Gamow-Teller Branch of 37K

RADIOACTIVITY 37K(β+) [from 40Ca(p, α), E=15 MeV]; measured Eγ, Iγ, βγ-coin; deduced branching ratios, log ft. 37Ar deduced levels, l-forbidden Gamow-Teller strength.

doi: 10.1103/PhysRevC.56.135
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1997HI06      Nucl.Phys. A620, 317 (1997)

B.Hinfurtner, G.Seewald, E.Hagan, E.Zech, I.S.Towner

Nuclear Magnetic Moments of 2.0 h 89Nb and 78 h 89Zr

RADIOACTIVITY 89Nb(β+), (EC) [from 89Y(α, 4n)89Nb]; measured Iγ(θ, T, H), NMR on oriented nuclei. 89Nb, 89Zr deduced ground state g, μ.

doi: 10.1016/S0375-9474(97)00193-0
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1997KO46      Nucl.Phys. A624, 293 (1997)

V.T.Koslowsky, E.Hagberg, J.C.Hardy, H.Schmeing, I.S.Towner

50Fe Beta Decay

RADIOACTIVITY 50Fe(β+) [from Ca(12C, 2n)]; measured Eγ, T1/2; deduced branching, consistency with conserved vector current hypothesis. Hyperpure Ge detector, plastic scintillator, high precision.

doi: 10.1016/S0375-9474(97)00370-9
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1997ST06      Phys.Rev.Lett. 78, 820 (1997)

N.J.Stone, D.Doran, M.Lindroos, J.Rikovska, M.Veskovic, G.White, D.A.Williams, B.Fogelberg, L.Jacobsson, I.S.Towner, K.Heyde

Magnetic Moments of Odd-A Sb Isotopes to 133Sb: Significant evidence for mesonic exchange current contributions and on core collective g factors

RADIOACTIVITY 129,131,133Sb(β-) [from 235U(n, F), E=thermal]; measured NMR, oriented nuclei; deduced μ, meson exchange effects role. Particle-core coupling model.

doi: 10.1103/PhysRevLett.78.820
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1997TO08      At.Data Nucl.Data Tables 67, 71 (1997)

I.S.Towner

Tables of Fractional Parentage Coefficients for the j = 7/2 Shell in a Seniority Basis with Good Isospin

doi: 10.1006/adnd.1997.0748
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1995EN04      Phys.Rev. C52, 2216 (1995)

J.Engel, M.T.Ressell, I.S.Towner, W.E.Ormand

Response of Mica to Weakly Interacting Massive Particles

doi: 10.1103/PhysRevC.52.2216
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1995SA16      Phys.Rev.Lett. 74, 1521 (1995)

G.Savard, A.Galindo-Uribarri, E.Hagberg, J.C.Hardy, V.T.Koslowsky, D.C.Radford, I.S.Towner

10C Superallowed Branching Ratio and the Cabibbo-Kobayashi-Maskawa Matrix Unitarity

RADIOACTIVITY 10C(β+) [from 10B(p, n)]; measured γγ-coin; deduced superallowed decay branching ratio, unitarity implications.

doi: 10.1103/PhysRevLett.74.1521
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1994HA07      Nucl.Phys. A571, 555 (1994)

E.Hagberg, T.K.Alexander, I.Neeson, V.T.Koslowsky, G.C.Ball, G.R.Dyck, J.S.Forster, J.C.Hardy, J.R.Leslie, H.-B.Mak, H.Schmeing, I.S.Towner

Confirmation of the l-Forbidden Gamow-Teller Decay Branch of 39Ca

RADIOACTIVITY 39Ca(β+); measured Eγ, Iγ, γββ-coin; deduced ft values, β branching ratios. Hyperpure Ge detector, plastic scintillators.

doi: 10.1016/0375-9474(94)90225-9
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1994HA43      Phys.Rev.Lett. 73, 396 (1994); Erratum Phys.Rev.Lett. 74, 1041 (1995)

E.Hagberg, V.T.Koslowsky, J.C.Hardy, I.S.Towner, J.G.Hykawy, G.Savard, T.Shinozuka

Tests of Isospin Mixing Corrections in Superallowed 0+ → 0+ β Decays

RADIOACTIVITY 38mK(β+); 46V(β+); 50Mn(β+); 54Co(β+); measured β-delayed γ spectra; deduced nonanalog 0+ → 0+ branching, limits, isospin mixing corrections implications.

doi: 10.1103/PhysRevLett.73.396
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1994PA31      Nucl.Phys. A579, 381 (1994)

T.-S.Park, I.S.Towner, K.Kubodera

Nuclear Matrix Elements of Axial-Charge Exchange Currents Derived in Heavy-Fermion Chiral Perturbation Theory

NUCLEAR STRUCTURE A=16-208; calculated impulse approximation, meson exchange contributions to current ratio. Heavy-fermion chiral perturbation theory, shell model.

doi: 10.1016/0375-9474(94)90914-8
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1994TO06      Phys.Rev. C49, 2391 (1994)

I.S.Towner, A.C.Hayes

P, T-Violating Nuclear Matrix Elements in the One-Meson Exchange Approximation

doi: 10.1103/PhysRevC.49.2391
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1994TO12      Phys.Lett. 333B, 13 (1994)

I.S.Towner

Quenching of Spin Operators in the Calculation of Radiative Corrections for Nuclear Beta Decay

NUCLEAR STRUCTURE A=10-54; calculated 0+-0+ superallowed Fermi β-decay radiative correction axial vector component; deduced quenching role.

doi: 10.1016/0370-2693(94)91000-6
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1994WA01      Phys.Rev. C49, 824 (1994)

E.K.Warburton, I.S.Towner, B.A.Brown

First-Forbidden β Decay: Meson-exchange enhancement of the axial charge at A ≈ 16

NUCLEAR STRUCTURE 11Be, 15,16N(β-); calculated two-body exchange current, one-body impulse approximation matrix elements; deduced axial-charge matrix element multiplicative factor. Shell model.

doi: 10.1103/PhysRevC.49.824
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1993HA06      Phys.Lett. 302B, 157 (1993)

A.C.Hayes, I.S.Towner

Shell Dependence of the Coupling Constants for the Effective One-Body Parity Nonconserving Weak Interaction

NUCLEAR STRUCTURE 16O, 40Ca, 90Zr, 208Pb, 232Th; calculated effective one-body parity nonconserving weak interaction coupling constants vs mass. Meson exchange model, shell model.

doi: 10.1016/0370-2693(93)90376-S
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1992TO03      Nucl.Phys. A540, 478 (1992)

I.S.Towner

The Nuclear-Structure Dependence of Radiative Corrections in Superallowed Fermi Beta-Decay

RADIOACTIVITY 14O, 26Al, 34Cl, 38K, 42Sc, 46V, 50Mn, 54Co; calculated β-decay rate correction terms, ft value. Superallowed Fermi β-decay, radiative corrections, shell model.

doi: 10.1016/0375-9474(92)90170-O
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1992TO04      Nucl.Phys. A542, 631 (1992)

I.S.Towner

Enhancement in Axial-Charge Matrix Elements from Meson-Exchange Currents

NUCLEAR STRUCTURE A=16, 40, 48, 96, 132, 208; calculated first forbidden β-decay enhancement factor. Meson exchange model.

doi: 10.1016/0375-9474(92)90261-H
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1992WA28      Phys.Lett. 294B, 1 (1992)

E.K.Warburton, I.S.Towner

Renormalization of the Axial Charge at A ≈ 132

NUCLEAR STRUCTURE 133,134Sn, 134Sb; calculated mesonic exchange contributions to axial charge in first-forbidden β-decay; deduced other effects contribution estimates. Shell model.

doi: 10.1016/0370-2693(92)91629-N
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1991AL06      Nucl.Phys. A526, 407 (1991)

T.K.Alexander, G.C.Ball, J.S.Forster, I.S.Towner, J.R.Leslie, H.-B.Mak, J.Johansson, J.A.Kuehner, J.C.Waddington

The l-Forbidden M1 Decay of the 2522 keV Level in 39K

NUCLEAR REACTIONS 4He(39K, α), E=100 MeV; measured Doppler shift attenuation, αγ-coin. 39K levels deduced T1/2, B(M1).

doi: 10.1016/0375-9474(91)90293-F
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1991KI04      Nucl.Phys. A529, 39 (1991)

S.W.Kikstra, Z.Guo, C.van der Leun, P.M.Endt, S.Raman, T.A.Walkiewicz, J.W.Starner, E.T.Jurney, I.S.Towner

Superallowed 26mAl(β++EC)26Mg Decay

NUCLEAR REACTIONS 25Mg(n, γ), E=thermal; measured Eγ, Iγ. 26Mg deduced neutron separation energy. 25Mg(p, γ), E=0.7-1.2 MeV; measured Ep, Eγ. 26Al deduced resonances, proton separation energy, isomer (β++EC) decay Q, log ft. Enriched targets.

doi: 10.1016/0375-9474(91)90784-4
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1990HA13      Nucl.Phys. A509, 429 (1990)

J.C.Hardy, I.S.Towner, V.T.Koslowsky, E.Hagberg, H.Schmeing

Superallowed 0+ → 0+ Nuclear β-Decays: A critical survey with tests of CVC and the standard model

RADIOACTIVITY 14O, 26mAl, 34Cl, 38mK, 42Sc, 46V, 50Mn, 54Co; analyzed T1/2, other data; deduced up-down quark mixing element.

doi: 10.1016/0375-9474(90)90086-2
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1989CL02      Nucl.Phys. A493, 293 (1989)

E.T.H.Clifford, E.Hagberg, J.C.Hardy, H.Schmeing, R.E.Azuma, H.C.Evans, V.T.Koslowsky, U.J.Schrewe, K.S.Sharma, I.S.Towner

The Decay of 20Na: Measurements of isospin mixing and the weak vector coupling constant as well as other new decay data

RADIOACTIVITY 20Na [from 12C(10B, 2n), mass separation]; measured β+ rays, β-delayed Eα, Iα, Eγ, Iγ, T1/2, I(Eγ), (βα)-coin; deduced ft values, βνα-triple correlation coefficients, vector weak coupling constants. 20Ne deduced branching ratios, Gamow-Teller matrix elements, levels, isospin mixing amplitudes. Natural target, Ge(Li), Si surface barrier detectors, NE102A plastic scintillator-Si surface barrier detector telescopes.

doi: 10.1016/0375-9474(89)90399-0
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1989KI11      Nucl.Phys. A496, 429 (1989)

S.W.Kikstra, C.van der Leun, S.Raman, E.T.Jurney, I.S.Towner

Superallowed 42Sc(β+)42Ca Decay

NUCLEAR REACTIONS 41Ca(n, γ), E=thermal; measured Eγ, Iγ. 42Ca deduced neutron separation energy, levels. 41Ca(p, γ), E=1.7-2.1 MeV; measured σ(Ep), Eγ, Iγ. 42Sc deduced resonances, J, π, T, T1/2, decay, proton separation energy, Q(β). Enriched target.

doi: 10.1016/0375-9474(89)90069-9
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1988AL05      Nucl.Phys. A477, 453 (1988)

T.K.Alexander, G.C.Ball, J.S.Forster, I.S.Towner, J.R.Leslie, H.-B.Mak

The l-Forbidden Magnetic Dipole Transition in A = 39

NUCLEAR REACTIONS 3He(40Ca, α), E=110 MeV; measured DSA, αγ-coin. 39Ca levels deduced T1/2, B(M1), single-particle operator normalizations.

doi: 10.1016/0375-9474(88)90351-X
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1987DE42      Nucl.Phys. A475, 720 (1987)

J.Delorme, I.S.Towner

Relativistic Shell Models and Meson-Exchange Currents

NUCLEAR STRUCTURE A=15-41; calculated μ corrections. Relativistic shell models.

doi: 10.1016/0375-9474(87)90234-X
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1985AL21      Nucl.Phys. A445, 189 (1985)

T.K.Alexander, B.Castel, I.S.Towner

Neutron and Proton Polarization Charges from E2 Mirror Transitions

NUCLEAR STRUCTURE 17,18O, 17,19F, 18,19,20,22Ne, 22,24,25,26Mg, 25,27Al, 26,27,28,29,30Si, 29P, 30,32,33,34S, 34,36,38Ar, 38Ca; analyzed data; deduced E2 effective charges. Schematic model.

doi: 10.1016/0375-9474(85)90067-3
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1985HO17      Nucl.Phys. A441, 344 (1985)

D.Horn, I.S.Towner, O.Hausser, D.Ward, H.R.Andrews, M.A.Lone, J.F.Sharpey-Schafer, N.Rud, P.Taras

Single-Particle States at very High Spin in the Light Dysprosium Isotopes

NUCLEAR REACTIONS 124Sn(32S, xn), E=150, 163 MeV; measured γγ-coin, recoil distance. 150,151,152Dy deduced levels, J, π, T1/2, B(λ). Pulsed beam, Compton suppressed Ge(Li) detectors, NaI(Tl) array, plunger. Shell model, effective interactions.

NUCLEAR STRUCTURE 148,149,150,151,152Dy; calculated level, B(λ). Shell model, effective interactions.

doi: 10.1016/0375-9474(85)90037-5
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1984HA32      J.Phys.(Paris), Colloq.C4, 417 (1984); See 1984Ha58

J.C.Hardy, I.S.Towner

Gamow-Teller Strength Distribution in the β-Decay of Exotic Nuclei


1984HA58      J.Phys.(Paris), Colloq.C-4, 417 (1984)

J.C.Hardy, I.S.Towner

Gamow-Teller Strength Distribution in the β-Decay of Exotic Nuclei

RADIOACTIVITY 14O, 18Ne, 22Mg, 34Ar, 38Ca, 42Ti(β+); analyzed Gamow-Teller strengths. 76,77Zn, 76,77,78,79,80,81Ga, 85Se(β-); 182,183,184,185,186,187,189,191Hg(β+), (EC); analyzed β-strength functions. A=72-154; analyzed average β-strength functions. 73Br, 81Zr, 77Sr, 73Kr, 69Se, 65Ge, 113,115,117Xe, 109Te(β+p); 97Rb(β-n); analyzed delayed proton, neutron spectra; deduced average strength functions.


1984TO06      J.Phys.(Paris), Colloq.C4, 519 (1984); See 1984To15

I.S.Towner, F.C.Khanna

On l-Forbidden M1 and GT Transitions in A = 39


1984TO15      J.Phys.(Paris), Colloq.C-4, 519 (1984)

I.S.Towner, F.C.Khanna

On l-Forbidden M1 and GT Transitions in A = 39

NUCLEAR STRUCTURE A=39; calculated isovector single particle matrix element, l-allowed transition corrections. One boson exchange model.


1983CL01      Phys.Rev.Lett. 50, 23 (1983)

E.T.H.Clifford, J.C.Hardy, H.Schmeing, R.E.Azuma, H.C.Evans, T.Faestermann, E.Hagberg, K.P.Jackson, V.T.Koslowsky, U.J.Schrewe, K.S.Sharma, I.S.Towner

Kinematic Shifts in the β-Delayed Particle Decay of 20Na, and the β-ν Angular Correlation

RADIOACTIVITY 20Na(β+), (EC) [from 12C(10B, 2n), E=50 MeV]; measured βν(θ), βνα-coin; deduced β-delayed α-particle kinematic shifts, triple correlation coefficient; deduced superallowed β-decay vector weak coupling constant.

doi: 10.1103/PhysRevLett.50.23
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1983HO09      Phys.Rev.Lett. 50, 1447 (1983)

D.Horn, O.Hausser, I.S.Towner, H.R.Andrews, M.A.Lone, P.Taras

Identification of Single-Particle Configurations at very High Spin in 150-152Dy

NUCLEAR STRUCTURE 148,149,150,151,152Dy; calculated levels, B(λ) ratios. Shell model.

NUCLEAR REACTIONS 124Sn(32S, xn), E=163 MeV; measured γγ-coin. 150,151,152Dy deduced levels, J, π, configurations, γ-branching, B(λ) ratios. Shell model.

doi: 10.1103/PhysRevLett.50.1447
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1983RA04      Phys.Rev. C27, 1188 (1983)

S.Raman, E.T.Jurney, D.A.Outlaw, I.S.Towner

34Cl Superallowed β Decay

RADIOACTIVITY 34Cl(β+) [from 33S(p, γ)]; 35S(β-); analyzed data. 34Cl deduced Q(β++EC), T1/2, ft. 35S deduced Q(β-).

NUCLEAR REACTIONS 32,33,34S(n, γ), E=thermal; measured Eγ. 33,34,35S deduced neutron separation energy. 33,34S(p, γ), E=0.9-1.4 MeV; measured Eγ. 34Cl, 35Cl deduced resonances, proton separation energy.

doi: 10.1103/PhysRevC.27.1188
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1983TO08      Nucl.Phys. A399, 334 (1983)

I.S.Towner, F.C.Khanna

Corrections to the Single-Particle M1 and Gamow-Teller Matrix Elements

NUCLEAR STRUCTURE A=3, 15, 17, 39, 41; calculated magnetic moment, M1, Gamow-Teller matrix element corrections. Second-order core polarization, isobar, meson exchange currents.

doi: 10.1016/0375-9474(83)90252-X
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1981TO03      Nucl.Phys. A356, 445 (1981)

I.S.Towner, F.C.Khanna

Meson-Exchange Currents in Thermal n - 3He Radiative Capture

NUCLEAR REACTIONS 3He(n, γ), E=thermal; calculated σ. Oscillator wave functions, meson exchange effects.

doi: 10.1016/0375-9474(81)90200-1
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1981TO16      Nucl.Phys. A372, 331 (1981)

I.S.Towner, F.C.Khanna

Role of 2p-2h States in Weak 0+-0- Transitions in A = 16 Nuclei

NUCLEAR REACTIONS 16O(μ-, ν), E at rest; calculated muon capture rate. Meson exchange, second-order perturbation theory.

RADIOACTIVITY 16N; calculated β-decay rate. Meson exchange, second-order perturbation theory.

doi: 10.1016/0375-9474(81)90039-7
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1981VA07      J.Phys.(London) G7, 1029 (1981)

M.G.Vassanji, F.C.Khanna, I.S.Towner

A Calculation of the Deuteron Static Moments in a One-Boson-Exchange Model

NUCLEAR STRUCTURE 2H; calculated μ, quadrupole moment, rms radius. One-boson exchange model.

doi: 10.1088/0305-4616/7/8/009
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1980EW02      Nucl.Phys. A343, 109 (1980)

G.T.Ewan, E.Hagberg, J.C.Hardy, B.Jonson, S.Mattsson, P.Tidemand-Petersson, I.S.Towner

The Decay of 35K

RADIOACTIVITY 35K [from 45Sc(p, 8n3p), chemical, mass separation]; measured Eγ, Iγ, β-delayed Ep, Ip; deduced logft. 35Ar deduced levels. Ge(Li), surface barrier Si detectors.

doi: 10.1016/0375-9474(80)90643-0
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