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2021KO09      Nucl.Instrum.Methods Phys.Res. A1000, 165240 (2021)

K.Kolos, A.M.Hennessy, N.D.Scielzo, V.E.Iacob, J.C.Hardy, M.A.Stoyer, A.P.Tonchev, W.-J.Ong, M.T.Burkey, B.Champine, J.A.Clark, P.Copp, A.Gallant, E.B.Norman, R.Orford, H.I.Park, J.Rohrer, D.Santiago-Gonzalez, G.Savard, A.J.Shaka, B.S.Wang, S.Zhu

New approach to precisely measure γ-ray intensities for long-lived fission products, with results for the decay of 95Zr

RADIOACTIVITY 95Zr, 95Nb, 95Sr, 95Y(β-); measured decay products, Eγ, Iγ, Eβ, Iβ, β-γ-coin.; deduced γ-ray energies and intensities, β-branching ratios. Comparison with a Monte Carlo decay code simulations. CARIBU facility, the reactor facility at TAMU.

doi: 10.1016/j.nima.2021.165240
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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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2020HO10      Phys.Rev. C 102, 014310 (2020)

V.Horvat, E.E.Tereshatov, J.C.Hardy, N.Nica, C.M.Folden, V.E.Iacob, M.B.Trzhaskovskaya

K-shell internal conversion coefficient for M4 decay of the 30.8 keV isomer in 93Nb

RADIOACTIVITY 93Nb(IT); measured Eγ, Iγ, and K-shell conversion coefficient of the 30.76-keV M4 transition from the 30.76-keV, (1/2-) isomer using a Si(Li) detector for direct IT γ-ray and IC K-shell x-ray detection; deduced precise level energy of the isomer. Comparison with different theoretical models.

doi: 10.1103/PhysRevC.102.014310
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2020IA01      Phys.Rev. C 101, 015504 (2020)

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

New precise half-life measurement for the superallowed β+ emitter 34Ar

RADIOACTIVITY 34Ar(β+) [from 1H(35Cl, 2n), E=30 MeV/nucleon at the K500 superconducting cyclotron of Texas A and M University, followed by separation of fragments using the Momentum Achromat Recoil Spectrometer (MARS)]; measured Eβ, decay time spectrum, precise T1/2 of 34Ar decay using 4π proportional gas counter; deduced ft value for the superallowed β transition. Data analyzed as a linked parent-daughter pair. Discussed uncertainty budget. Comparison with previous experimental results.

doi: 10.1103/PhysRevC.101.015504
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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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2018HA07      Appl.Radiat.Isot. 134, 406 (2018)

J.C.Hardy, N.Nica, V.E.Iacob, M.B.Trzhaskovskaya

Precise test of internal-conversion theory: αK measurements for transitions in nine nuclei spanning 45 ≤ Z ≤ 78

RADIOACTIVITY 111Cd, 134Cs, 119Sn, 125,127Te, 137Ba, 193Ir, 197Pt(IT); measured decay products, Eγ, Iγ, Eβ, Iβ, X-rays; deduced internal-conversion coefficients. Comparison with theoretical calculations.

doi: 10.1016/j.apradiso.2017.05.021
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2018IA01      Phys.Rev. C 97, 035501 (2018)

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

Precise half-life measurement of the superallowed emitter 30S

RADIOACTIVITY 30S(β+), (EC)[from 1H(31P, 2n), E=30 MeV/nucleon]; 30P(β+), (EC)[from 30S decay]; measured β+ using 4π proportional gas counter, half-lives of 30S and 30P decays. Comparison with previous measurements. Relevance to determination of up-down element of the Cabibbo-Kobayashi-Maskawa quark-mixing matrix Vud for 0+ to 0+ superallowed β transition in the decay of 30S to 30P.

NUCLEAR REACTIONS 1H(31P, 2n)27Si/29P/30S/31S, E=30 MeV/nucleon; measured yields of ions momentum achromat recoil spectrometer (MARS) spectrometer at Texas A and M University K500 superconducting cyclotron facility.

doi: 10.1103/PhysRevC.97.035501
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2018NI14      Phys.Rev. C 98, 054321 (2018)

N.Nica, J.C.Hardy, V.E.Iacob, V.Horvat, H.I.Park, T.A.Werke, K.J.Glennon, C.M.Folden, V.I.Sabla, J.B.Bryant, X.K.James, M.B.Trzhaskovskaya

Precise measurement of αK andαT for the 39.8-keV E3 transition in 103Rh: Test of internal-conversion theory

RADIOACTIVITY 103Rh(IT)[from 103Ru(β-) produced in 102Ru(n, γ), and 103Pd(EC) produced in 102Pd(n, γ) at the TRIGA reactor of Texas A and M]; measured Eγ, Iγ, K-x rays, K-shell and total internal conversion coefficients; deduced M4 admixture and mixing ratio for the 39.8-keV isomeric transition in 103Rh. Comparison with Dirac-Fock calculations, and results disagree with the theory which ignores the K-shell atomic vacancy. 103Ru(β-)[from 102Ru(n, γ), E=thermal]; measured Eγ, Iγ; deduced K-x ray intensity using the known data for multipolarities and mixing ratios of non-isomeric transitions in 103Rh from the decay of 103Ru. Comparison with previous experimental γ-ray intensities in 103Ru decay.

doi: 10.1103/PhysRevC.98.054321
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2018SH27      Phys.Rev. C 98, 015502 (2018)

P.D.Shidling, R.S.Behling, B.Fenker, J.C.Hardy, V.E.Iacob, M.Mehlman, H.I.Park, B.T.Roeder, D.Melconian

High-precision half-life measurement of the β+ decay of 21Na

RADIOACTIVITY 21Na(β+)[from 1H(22Ne, 21Na), E=25 MeV/nucleon, followed by analysis of reaction products by the momentum achromat recoil spectrometer (MARS) at Texas A and M cyclotron facility]; measured positrons and half-life of the decay of 21Na using 4π continuous gas-flow proportional counter; deduced magnitude of the up-down element of the Cabbibo-Kobayashi-Maskawa matrix Vud. Comparison with previous experimental values, and deduced averaged half-life and Ft value.

doi: 10.1103/PhysRevC.98.015502
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2017ER01      Phys.Rev. C 95, 025501 (2017); Pub.Note Phys.Rev. C 102, 039902 (2020)

T.Eronen, J.C.Hardy, L.Canete, A.Jokinen, J.Hakala, A.Kankainen, V.S.Kolhinen, J.Koponen, I.D.Moore, I.M.Murray, H.Penttila, I.Pohjalainen, O.Poleshchuk, J.Reinikainen, S.Rinta-Antila, N.Soukouti, A.Voss, J.Aysto

QEC value of the superallowed β emitter 42Sc

ATOMIC MASSES 42,42mSc, 42Ca; measured cyclotron frequency ratios using time-of-flight ion-cyclotron resonance (TOF-ICR) technique at IGISOL-JYFLTRAP facility at Jyvaskyla; deduced precise Q values and compared with previous experimental data, precise energy of the 7+ isomeric state in 42Sc; discussed error budgets for Ft values of superallowed β transition in 42Sc.

doi: 10.1103/PhysRevC.95.025501
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2017NI03      Phys.Rev. C 95, 034325 (2017)

N.Nica, J.C.Hardy, V.E.Iacob, H.I.Park, K.Brandenburg, M.B.Trzhaskovskaya

Precise measurement of αK for the 88.2-keV M4 transition in 127Te: Test of internal-conversion theory

RADIOACTIVITY 127Te(β-); 127mTe(IT), (β-)[from 126Te(n, γ), E=thermal]; measured E(x ray), I(x ray), Eγ, Iγ, K-conversion coefficient for the 88.2-keV M4 transition in 127Te and compared with Dirac-Fock theoretical calculations. 127I; deduced levels, β branchings, γ-branching ratios, and compared with previous experimental results.

doi: 10.1103/PhysRevC.95.034325
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2017NI10      Phys.Rev. C 95, 064301 (2017)

N.Nica, J.C.Hardy, V.E.Iacob, T.A.Werke, C.M.Folden, K.Ofodile, M.B.Trzhaskovskaya

Precise measurement of αK and αT for the 109.3-keV M4 transition in 125Te: Test of internal-conversion theory

RADIOACTIVITY 125mTe(IT)[from 124Te(n, γ), E=thermal at 1-MW TRIGA reactor of Texas A and M Nuclear Science Center]; measured Eγ, Iγ, E(x ray), I(x ray), K-conversion coefficient, and total conversion coefficient for 109.3-keV M4 transition. Comparison with Dirac-Fock calculations.

doi: 10.1103/PhysRevC.95.064301
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2016NI05      Phys.Rev. C 93, 034305 (2016)

N.Nica, J.C.Hardy, V.E.Iacob, T.A.Werke, C.M.Folden, L.Pineda, M.B.Trzhaskovskaya

Precise measurement of αK and αT for the 150.8-keV E3 transition in 111Cd: Test of internal-conversion theory

RADIOACTIVITY 111mCd(IT)[from 110Cd(n, γ), E=thermal from TRIGA reactor at Texas A and M]; measured Eγ, Iγ, I(K-x rays); deduced total and K-conversion coefficients for 150.8-keV E3 transition. Comparison with theoretical value from Dirac-Fock theory which includes the atomic vacancy. Possible evidence of penetration effects for this transition.

doi: 10.1103/PhysRevC.93.034305
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2015AU02      At.Data Nucl.Data Tables 103-104, 1 (2015); See 2014PF01

G.Audi, K.Blaum, M.Block, G.Bollen, S.Goriely, J.C.Hardy, F.Herfurth, F.G.Kondev, H.-J.Kluge, D.Lunney, J.M.Pearson, G.Savard, K.S.Sharma, M.Wang, Y.H.Zhang

Comment on "Atomic mass compilation 2012" by B. Pfeiffer, K. Venkataramaniah, U. Czok, C. Scheidenberger

COMPILATION 45Cr, 47Ar, 65As, 73Ge, 100Sn, 286Nh; compiled experimental atomic masses; deduced differences with work of B. Pfeiffer et al.

doi: 10.1016/j.adt.2014.05.003
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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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2014HA07      Appl.Radiat.Isot. 87, 87 (2014)

J.C.Hardy, N.Nica, V.E.Iacob, S.Miller, M.Maguire, M.B.Trzhaskovskaya

Precise test of internal-conversion theory: Transitions measured in five nuclei spanning 50 ≤ Z ≤ 78

RADIOACTIVITY 197Pt, 193Ir, 137Ba, 134Cs, 119Sn(IT); measured Eγ, Iγ, X-rays; deduced internal conversion coefficients. Comparison with theoretical calculations.

doi: 10.1016/j.apradiso.2013.11.033
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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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2014NI02      Phys.Rev. C 89, 014303 (2014)

N.Nica, J.C.Hardy, V.E.Iacob, M.Bencomo, V.Horvat, H.I.Park, M.Maguire, S.Miller, M.B.Trzhaskovskaya

Precise measurement of αK for the 65.7-keV M4 transition in 119Sn: Extended test of internal-conversion theory

RADIOACTIVITY 119Sn(IT)[from 118Sn(n, γ)]; measured Eγ, Iγ, E(x rays), I(x rays); deduced K-shell internal conversion coefficient of 65.7-keV M4 transition. Comparisons with theoretical conversion coefficient from Dirac-Fock relativistic calculation with and without K-shell atomic vacancy, and with previous measurements.Evidence of support for inclusion of atomic vacancy from comparison of precisely measured conversion coefficients with theoretical calculations for E2, E3 and M4 isomeric transitions in 20 cases including 119Sn, 134Cs, 137Ba, 193Ir and 197Pt.

doi: 10.1103/PhysRevC.89.014303
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2014NI14      Nucl.Data Sheets 120, 91 (2014)

N.Nica, J.C.Hardy, V.E.Iacob

Further Test of Internal-conversion Theory with a Measurement in 119Sn

RADIOACTIVITY 119Sn(IT); measured decay products, Eγ, Iγ, X-rays.; deduced ce coefficient, influence of the atomic vacancy.

doi: 10.1016/j.nds.2014.07.015
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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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2014SH25      Phys.Rev. C 90, 032501 (2014)

P.D.Shidling, D.Melconian, S.Behling, B.Fenker, J.C.Hardy, V.E.Iacob, E.McCleskey, M.McCleskey, M.Mehlman, H.I.Park, B.T.Roeder

Precision half-life measurement of the β+ decay of 37K

RADIOACTIVITY 37K(β+)[from 1H(38Ar, 2n), E=29 MeV/nucleon, followed by separation using MARS apparatus at Texas A-M cyclotron facility]; measured Eβ, Iβ, precise half-life of 37K ground state using a 4π continuous-gas-flow proportional counter and a fast tape-transport system; deduced improved logft value, and Vud parameter. Comparison with previous experimental studies.

doi: 10.1103/PhysRevC.90.032501
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2013CH51      Nucl.Instrum.Methods Phys.Res. A728, 81 (2013)

L.Chen, J.C.Hardy, M.Bencomo, V.Horvat, N.Nica, H.I.Park

Digital beta counting and pulse-shape analysis for high-precision nuclear beta decay half-life measurements: Tested on 26Alm

RADIOACTIVITY 26Al(EC) [from H(27Al, X), E=23 MeV/nucleon]; measured decay products, Eβ, Iβ; deduced T1/2 and its uncertainty. Comparison with available data.

doi: 10.1016/j.nima.2013.06.039
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2012ER04      Eur.Phys.J. A 48, 48 (2012)

T.Eronen, J.C.Hardy

High-precision QEC-value measurements for superallowed decays

doi: 10.1140/epja/i2012-12048-y
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2012HA23      Appl.Radiat.Isot. 70, 1931 (2012)

J.C.Hardy, J.R.Goodwin, V.E.Iacob

Do radioactive half-lives vary with the Earth-to-Sun distance?

RADIOACTIVITY 198Au(β-); measured decay products, Eγ, Iγ; deduced T1/2 independent value for several Earth-Sun distances. Comparison with available data.

doi: 10.1016/j.apradiso.2012.02.021
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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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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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2012PA07      Phys.Rev. C 85, 035501 (2012)

H.I.Park, J.C.Hardy, V.E.Iacob, L.Chen, J.Goodwin, N.Nica, E.Simmons, L.Trache, R.E.Tribble

Precise half-life measurement of the superallowed β+ emitter 46V

RADIOACTIVITY 46V(β+)[from 1H(47Ti, 2n), E=32 MeV/nucleon]; measured β spectra, precise half-life of 46V isotope; deduced Ft value for superallowed β transition. Discussed error budget for half-life measurement.

doi: 10.1103/PhysRevC.85.035501
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2012TR08      J.Phys.:Conf.Ser. 337, 012058 (2012)

L.Trache, A.Banu, J.C.Hardy, V.E.Iacob, M.McCleskey, B.T.Roeder, E.Simmons, A.Spiridon, R.E.Tribble, A.Saastamoinen, A.Jokinen, J.Aysto, T.Davinson, G.Lotay, P.J.Woods, E.Pollacco

Decay spectroscopy for nuclear astrophysics: β- and β-delayed proton decay

RADIOACTIVITY 23Al, 27P, 31Cl(EC), (β+p) [from 1H(24Mg, X), E=48 MeV/nucleon; 1H(28Si, X), (32S, X), E=40 MeV/nucleon]; measured β-delayed Ep, Ip using DSSSD (double-sided strip Si detector), Iβ using Si detector, pβ-coin, Eγ, Iγ using HPGe, βγ-coin. 23Al deduced mass excess, partial decay scheme, levels, J, π, resonance strength, proton branching, isomeric decay, T1/2, IAS, log ft. Only the 23Al results presented.

doi: 10.1088/1742-6596/337/1/012058
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2011ER02      Phys.Rev. C 83, 055501 (2011); Pub.Note Phys.Rev. C 84, 059905 (2011)

T.Eronen, D.Gorelov, J.Hakala, J.C.Hardy, A.Jokinen, A.Kankainen, I.D.Moore, H.Penttila, M.Reponen, J.Rissanen, A.Saastamoinen, J.Aysto

QEC values of the superallowed β emitters 10C, 34Ar, 38Ca, and 46V

ATOMIC MASSES 10C, 10B, 34Ar, 34Cl, 34mCl, 38Ca, 38mK, 38Ar, 46V, 46Ti; measured resonance frequencies ratios using JYFLTRAP Penning-trap and 10C, 34Ar, 38Ca and 46V beams from IGISOL; deduced Q values for β+ decay. Time-of-flight ion-cyclotron-resonance (TOF-ICR) technique.

RADIOACTIVITY 10C, 34Ar, 38Ca, 46V(β+); measured Q values for decay from mass measurements.

doi: 10.1103/PhysRevC.83.055501
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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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2011PA38      Phys.Rev. C 84, 065502 (2011)

H.I.Park, J.C.Hardy, V.E.Iacob, A.Banu, L.Chen, V.V.Golovko, J.Goodwin, V.Horvat, N.Nica, E.Simmons, L.Trache, R.E.Tribble

Precise half-life measurement of the superallowed β+ emitter 38Ca

RADIOACTIVITY 38Ca, 38mK(β+), (EC)[38Ca from 1H(39K, 2n), E=30 MeV/nucleon, 38K from 38Ca decay]; measured I(β+) using 4π proportional gas counter, half-life, data analyzed as a linked parent-daughter decay. Comparison with previous results. Superallowed β+ emitters.

doi: 10.1103/PhysRevC.84.065502
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2011SA15      Phys.Rev. C 83, 045808 (2011)

A.Saastamoinen, L.Trache, A.Banu, M.A.Bentley, T.Davinson, J.C.Hardy, V.E.Iacob, M.McCleskey, B.T.Roeder, E.Simmons, G.Tabacaru, R.E.Tribble, P.J.Woods, J.Aysto

Experimental study of β-delayed proton decay of 23Al for nucleosynthesis in novae

RADIOACTIVITY 23Al(β+), (β+p); measured E(p), I(p), Eγ, Iγ, βγ-, βp-coin. 22Na, 23Mg; deduced levels, J, π, widths, IAS of 23Al, resonance strength at 7787 keV and its contribution to the reaction rates for 22Na(p, γ) reaction at typical nova peak temperatures.

doi: 10.1103/PhysRevC.83.045808
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2010BA43      Phys.Rev. C 82, 045501 (2010)

G.C.Ball, G.Boisvert, P.Bricault, R.Churchman, M.Dombsky, T.Lindner, J.A.Macdonald, E.Vandervoort, S.Bishop, J.M.D'Auria, J.C.Hardy, V.E.Iacob, J.R.Leslie, H.-B.Mak

Precise half-life measurement of the superallowed β+ emitter 38Km

RADIOACTIVITY 38mK(β+)[38K beam from Ca(p, X), E=500 MeV]; measured integral activity using a 4π continuous gas flow proportional β counter, half-life; deduced Ft value for superallowed β transition. Comparison with previous half-life measurements.

doi: 10.1103/PhysRevC.82.045501
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2010GO25      Phys.Rev. C 82, 044320 (2010)

J.R.Goodwin, N.Nica, V.E.Iacob, A.Dibidad, J.C.Hardy

Measurement of the half-life of 198Au in a nonmetal: High-precision measurement shows no host-material dependence

RADIOACTIVITY 198Au(β-)[from 197Au(n, γ), E=thermal]; measured Eγ, Iγ, half-life in a non-metal environment; deduced no dependence of half-life on host material.

doi: 10.1103/PhysRevC.82.044320
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2010HA12      Appl.Radiat.Isot. 68, 1550 (2010)

J.C.Hardy, J.R.Goodwin, V.V.Golovko, V.E.Iacob

Tests of nuclear half-lives as a function of the host medium and temperature: Refutation of recent claims

RADIOACTIVITY 198Au(β-), 97Ru(EC) [from 197Au, Ru(n, γ)]; measured Eγ, Iγ; deduced T1/2, lack of temperature-dependent effects at low temperatures.

doi: 10.1016/j.apradiso.2009.11.047
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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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2010IA01      Phys.Rev. C 82, 035502 (2010)

V.E.Iacob, J.C.Hardy, A.Banu, L.Chen, V.V.Golovko, J.Goodwin, V.Horvat, N.Nica, H.I.Park, L.Trache, R.E.Tribble

Precise half-life measurement of the superallowed β+ emitter 26Si

RADIOACTIVITY 26Si(β+)[from 1H(27Al, 2n), E=30 MeV/nucleon]; measured Eβ, Iβ using a 4π proportional gas counter system, and half-life. Comparison with previous results.

doi: 10.1103/PhysRevC.82.035502
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2010SA41      J.Phys.:Conf.Ser. 202, 012010 (2010)

A.Saastamoinen, L.Trache, A.Banu, M.A.Bentley, T.Davinson, T.Eronen, J.C.Hardy, V.E.Iacob, D.Jenkins, A.Jokinen, M.McCleskey, B.Roeder, G.Tabacaru, R.E.Tribble, P.J.Woods, J.Aysto, for the IGISOL/MARS Collaboration

Studies of astrophysically interesting nucleus 23Al

NUCLEAR REACTIONS 1H(24Mg, 2n)23Al, E=48 MeV/nucleon; measured reaction products using DSSD (double-sided Si strip detector), Si and HPGe detectors at the focal plane of MARS separator, β-delayed 23Al proton decay; deduced proton branching.

ATOMIC PHYSICS 23Al; measured mass, mass excess, proton separation using JYFLTRAP Penning trap at IGISOL.

doi: 10.1088/1742-6596/202/1/012010
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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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2009ER07      Phys.Rev.Lett. 103, 252501 (2009)

T.Eronen, V.-V.Elomaa, J.Hakala, J.C.Hardy, A.Jokinen, I.D.Moore, M.Reponen, J.Rissanen, A.Saastamoinen, C.Weber, J.Aysto

QEC Values of the Superallowed β Emitters 34Cl and 38Km

RADIOACTIVITY 34Cl, 38K(EC); measured cyclotron frequency ratios; deduced Q-values with high precision.Online Pening trap.

doi: 10.1103/PhysRevLett.103.252501
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2009GO29      Phys.Rev. C 80, 045501 (2009)

J.R.Goodwin, V.V.Golovko, V.E.Iacob, J.C.Hardy

Half-life of the electron-capture decay of 97Ru: Precision measurement shows no temperature dependence

RADIOACTIVITY 97Ru(EC); 103Ru, 105Rh(β-); measured Eγ, Iγ, half-lives at room temperature and 19 K.

doi: 10.1103/PhysRevC.80.045501
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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


2009NI13      Phys.Rev. C 80, 064314 (2009)

N.Nica, J.C.Hardy, V.E.Iacob, J.Goodwin, C.Balonek, M.Hernberg, J.Nolan, M.B.Trzhaskovskaya

Further test of internal-conversion theory with a measurement in 197Pt

RADIOACTIVITY 197mPt(IT); measured Eγ, Iγ, x rays; deduced K-shell internal conversion coefficient of 346.5-keV M4 isomeric transition. Comparison with theoretical conversion coefficient from Dirac-Fock calculation.

doi: 10.1103/PhysRevC.80.064314
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2008ER04      Phys.Rev.Lett. 100, 132502 (2008)

T.Eronen, V.-V.Elomaa, U.Hager, J.Hakala, J.C.Hardy, A.Jokinen, A.Kankainen, I.D.Moore, H.Penttila, S.Rahaman, S.Rinta-Antila, J.Rissanen, A.Saastamoinen, T.Sonoda, C.Weber, J.Aysto

QEC Values of the Superallowed β Emitters 50Mn and 54Co

RADIOACTIVITY 50Mn, 54Co(EC); measured Q values using penning trap.

doi: 10.1103/PhysRevLett.100.132502
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2008HA11      Appl.Radiat.Isot. 66, 701 (2008)

J.C.Hardy, N.Nica, V.E.Iacob, C.Balonek, M.B.Trzhaskovskaya

Precise tests of internal-conversion theory

RADIOACTIVITY 134Cs, 137Ba(IT); measured Eγ, Iγ, E(X-ray), I(X-ray); deduced ICC. Compared results to existing data and to model calculations.

doi: 10.1016/j.apradiso.2008.02.006
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2008IA01      Phys.Rev. C 77, 045501 (2008)

V.E.Iacob, J.C.Hardy, V.Golovko, J.Goodwin, N.Nica, H.I.Park, L.Trache, R.E.Tribble

Precise half-life measurement of the superallowed β+ emitter 10C

RADIOACTIVITY 10C(β+) [from 1H(11B, 2n), E=23 MeV/nucleon]; measured half-life using pulsed-beam method; deduced ft value for superallowed β decay.

doi: 10.1103/PhysRevC.77.045501
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2008NI02      Phys.Rev. C 77, 034306 (2008)

N.Nica, J.C.Hardy, V.E.Iacob, C.Balonek, M.B.Trzhaskovskaya

Internal conversion coefficients in 134Cs, 137Ba, and 139La: A precise test of theory

RADIOACTIVITY 139Ba(β-) [from 138Ba(n, γ)]; measured K-shell internal conversion coefficients. 134Cs, 137Ba; analyzed K-shell internal conversion coefficients. 134Cs, 137Ba, 139La; deduced T1/2 of 139Ba decay, experimental αK and compared with theory.

doi: 10.1103/PhysRevC.77.034306
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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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2007GO39      Eur.Phys.J. A 34, 271 (2007)

J.R.Goodwin, V.V.Golovko, V.E.Iacob, J.C.Hardy

The half-life of 198Au : High-precision measurement shows no temperature dependence

RADIOACTIVITY 198Au(β-); measured Eγ, Iγ, T1/2. Temperature dependence not observed.

doi: 10.1140/epja/i2007-10509-0
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2007NI04      Phys.Rev. C 75, 024308 (2007)

N.Nica, J.C.Hardy, V.E.Iacob, W.E.Rockwell, M.B.Trzhaskovskaya

Test of internal-conversion theory with measurements in 134Cs and 137Ba

RADIOACTIVITY 137Cs(β-); 134mCs(IT) [from 133Cs(n, γ)]; measured Eγ, Iγ, X-ray spectra. 134Cs, 137Ba transitions deduced ICC. Comparison with model predictions.

doi: 10.1103/PhysRevC.75.024308
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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


2006ER08      Phys.Rev.Lett. 97, 232501 (2006)

T.Eronen, V.Elomaa, U.Hager, J.Hakala, A.Jokinen, A.Kankainen, I.Moore, H.Penttila, S.Rahaman, J.Rissanen, A.Saastamoinen, T.Sonoda, J.Aysto, J.C.Hardy, V.S.Kolhinen

Q Values of the Superallowed β Emitters 26Alm, 42Sc, and 46V and Their Impact on Vud and the Unitarity of the Cabibbo-Kobayashi-Maskawa Matrix

ATOMIC MASSES 26mAl, 42Sc, 46V; measured masses; deduced Q(EC). Comparison with previous results, implications for CKM matrix element discussed.

doi: 10.1103/PhysRevLett.97.232501
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2006HA12      Acta Phys.Pol. B37, 77 (2006)

J.C.Hardy

CVC tests and CKM unitarity

RADIOACTIVITY 18Ne, 22Mg, 26Si, 30S, 34Ar, 38Ca, 42Ti, 62Ga, 66As, 70Br, 74Rb; analyzed superallowed β-decay data; deduced conservation of vector current, matrix element unitarity.


2006HA36      Appl.Radiat.Isot. 64, 1392 (2006)

J.C.Hardy, N.Nica, V.E.Iacob, M.B.Trzhaskovskaya, R.G.Helmer

Test of internal-conversion theory with precise γ- and X-ray spectroscopy

RADIOACTIVITY 193mIr(IT); measured Eγ, Iγ, X-ray spectra; deduced conversion coefficient. 134mCs, 137Ba; analyzed ICC ratio. Comparison with model predictions.

doi: 10.1016/j.apradiso.2006.02.093
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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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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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2006IA03      Phys.Rev. C 74, 045810 (2006)

V.E.Iacob, Y.Zhai, T.Al-Abdullah, C.Fu, J.C.Hardy, N.Nica, H.I.Park, G.Tabacaru, L.Trache, R.E.Tribble

β decay of proton-rich nucleus 23Al and astrophysical consequences

RADIOACTIVITY 23Al(β+), (β+p) [from 1H(24Mg, X)]; measured Eγ, Iγ, βγ-coin, T1/2; deduced log ft. 23Mg deduced levels, J, π, IAS. 23Al deduced ground-state J, π. Astrophysical implications discussed.

doi: 10.1103/PhysRevC.74.045810
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2006IA05      Phys.Rev. C 74, 055502 (2006)

V.E.Iacob, J.C.Hardy, J.F.Brinkley, C.A.Gagliardi, V.E.Mayes, N.Nica, M.Sanchez-Vega, G.Tabacaru, L.Trache, R.E.Tribble

Precise half-life measurements for the superallowed β+ emitters 34Ar and 34Cl

RADIOACTIVITY 34,35Ar, 34Cl(β+) [from 1H(35Cl, xnyp)]; measured T1/2.

doi: 10.1103/PhysRevC.74.055502
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2005CL08      Eur.Phys.J. A 25, Supplement 1, 629 (2005)

J.A.Clark, R.C.Barber, B.Blank, C.Boudreau, F.Buchinger, J.E.Crawford, J.P.Greene, S.Gulick, J.C.Hardy, A.A.Hecht, A.Heinz, J.K.P.Lee, A.F.Levand, B.F.Lundgren, R.B.Moore, G.Savard, N.D.Scielzo, D.Seweryniak, K.S.Sharma, G.D.Sprouse, W.Trimble, J.Vaz, J.C.Wang, Y.Wang, B.J.Zabransky, Z.Zhou

Investigating the rp-process with the Canadian Penning trap mass spectrometer

ATOMIC MASSES 64Ge, 68Se; analyzed masses; deduced effective T1/2. 90,91Mo, 90,91,92,93Tc, 93,94Ru, 94,95Rh, 104,105,106,107In, 104,105,107,108Sn, 107,108Sb; measured masses. Penning trap, astrophysical implications discussed.

doi: 10.1140/epjad/i2005-06-172-3
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2005GR07      Phys.Rev. C 71, 044309 (2005)

G.F.Grinyer, C.E.Svensson, C.Andreoiu, A.N.Andreyev, R.A.E.Austin, G.C.Ball, R.S.Chakrawarthy, P.Finlay, P.E.Garrett, G.Hackman, J.C.Hardy, B.Hyland, V.E.Iacob, K.A.Koopmans, W.D.Kulp, J.R.Leslie, J.A.Macdonald, A.C.Morton, W.E.Ormand, C.J.Osborne, C.J.Pearson, A.A.Phillips, F.Sarazin, M.A.Schumaker, H.C.Scraggs, J.Schwarzenberg, M.B.Smith, J.J.Valiente-Dobon, J.C.Waddington, J.L.Wood, E.F.Zganjar

High precision measurements of 26Na β- decay

RADIOACTIVITY 26Na(β-) [from Si, Ta(p, X)]; measured Eγ, Iγ, T1/2; deduced log ft. 26Mg deduced levels, J, π, β-feeding intensities.

doi: 10.1103/PhysRevC.71.044309
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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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2005HA15      Nucl.Phys. A752, 101c (2005)

J.C.Hardy

CVC tests and CKM unitarity

RADIOACTIVITY 18Ne, 22Mg, 26Si, 30S, 34Ar, 38Ca, 42Ti, 62Ga, 66As, 70Br, 74Rb; analyzed superallowed β-decay data; deduced conservation of vector current, matrix element unitarity.

doi: 10.1016/j.nuclphysa.2005.02.028
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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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2005NI12      Phys.Rev. C 71, 054320 (2005)

N.Nica, J.C.Hardy, V.E.Iacob, J.R.Montague, M.B.Trzhaskovskaya

Precise measurement of K-shell fluorescence yield in iridium: An improved test of internal-conversion theory

RADIOACTIVITY 191Os(β-) [from 190Os(n, γ)]; measured Eγ, Iγ, X-ray spectra. 191Ir transition deduced ICC, fluorescence yield. Comparison with model predictions, 193mIr decay data. Need for K-shell hole to be included in calculations discussed.

doi: 10.1103/PhysRevC.71.054320
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2005SA44      Phys.Rev.Lett. 95, 102501 (2005)

G.Savard, F.Buchinger, J.A.Clark, J.E.Crawford, S.Gulick, J.C.Hardy, A.A.Hecht, J.K.P.Lee, A.F.Levand, N.D.Scielzo, H.Sharma, K.S.Sharma, I.Tanihata, A.C.C.Villari, Y.Wang

Q Value of the Superallowed Decay of 46V and Its Influence on Vud and the Unitarity of the Cabibbo-Kobayashi-Maskawa Matrix

ATOMIC MASSES 46Ti, 46V; measured masses; deduced Q(EC). Penning trap mass spectrometer.

RADIOACTIVITY 46V(EC); analyzed masses; deduced Q(EC), log ft. 10C, 14O, 22Mg, 26mAl, 34Cl, 34Ar, 38mK, 42Sc, 46V, 50Mn, 54Co, 74Rb; compiled, analyzed log ft; deduced quark-mixing matrix element.

doi: 10.1103/PhysRevLett.95.102501
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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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2004CL07      Nucl.Phys. A746, 342c (2004)

J.A.Clark, R.C.Barber, B.Blank, C.Boudreau, F.Buchinger, J.E.Crawford, S.Gulick, J.C.Hardy, A.Heinz, J.K.P.Lee, A.F.Levand, R.B.Moore, G.Savard, D.Seweryniak, K.S.Sharma, G.D.Sprouse, W.Trimble, J.Vaz, J.C.Wang, Z.Zhou

Precise mass measurements of astrophysical interest made with the Canadian Penning trap mass spectrometer

ATOMIC MASSES 68Se, 141,142,143,144,145,146,147Ba, 143,144,145,146,147,148La, 145,146,147,148,149,150,151Ce, 148,149,150,151,152,153Pr; measured masses. Penning trap mass spectrometer.

doi: 10.1016/j.nuclphysa.2004.09.051
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2004HE34      Appl.Radiat.Isot. 60, 173 (2004)

R.G.Helmer, N.Nica, J.C.Hardy, V.E.Iacob

Precise Efficiency Calibration of an HPGe Detector up to 3.5 MeV, with Measurements and Monte Carlo Calculations

doi: 10.1016/j.apradiso.2003.11.012
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2004NI14      Phys.Rev. C 70, 054305 (2004)

N.Nica, J.C.Hardy, V.E.Iacob, S.Raman, C.W.Nestor, Jr., M.B.Trzhaskovskaya

Precise measurement of αK for the M4 transition from 193Irm: A test of internal-conversion theory

RADIOACTIVITY 193mIr(IT) [from 192Os(n, γ) and subsequent decay]; measured Eγ, Iγ, X-ray spectra; deduced conversion coefficient. Comparison with model predictions.

doi: 10.1103/PhysRevC.70.054305
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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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2003HA20      Phys.Rev.Lett. 91, 082501 (2003)

J.C.Hardy, V.E.Iacob, M.Sanchez-Vega, R.G.Neilson, A.Azhari, C.A.Gagliardi, V.E.Mayes, X.Tang, L.Trache, R.E.Tribble

High Precision Measurement of the Superallowed 0+ → 0+ β Decay of 22Mg

RADIOACTIVITY 22Mg(β+) [from 1H(23Na, 2n)]; measured Eγ, Iγ, βγ-coin, T1/2; deduced superallowed branching ratio, log ft. 22Na levels deduced β-feeding intensities.

doi: 10.1103/PhysRevLett.91.082501
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2003HE28      Nucl.Instrum.Methods Phys.Res. A511, 360 (2003)

R.G.Helmer, J.C.Hardy, V.E.Iacob, M.Sanchez-Vega, R.G.Neilson, J.Nelson

The Use of Monte Carlo Calculations in the Determination of a Ge Detector Efficiency Curve

doi: 10.1016/S0168-9002(03)01942-9
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2003HY02      Phys.Rev. C 68, 015501 (2003)

B.C.Hyman, V.E.Iacob, A.Azhari, C.A.Gagliardi, J.C.Hardy, V.E.Mayes, R.G.Neilson, M.Sanchez-Vega, X.Tang, L.Trache, R.E.Tribble

Beta decay of 62Ga

RADIOACTIVITY 62Ga(EC) [from 1H(64Zn, 62Ga)]; measured Eγ, Iγ, T1/2, branching ratios. 62Zn levels deduced β-feeding intensities. Mass separator.

NUCLEAR REACTIONS 1H(64Zn, X), E=41, 42 MeV/nucleon; measured fragments isotopic yields.

doi: 10.1103/PhysRevC.68.015501
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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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2002HA61      Appl.Radiat.Isot. 56, 65 (2002)

J.C.Hardy, V.E.Iacob, M.Sanchez-Vega, R.T.Effinger, P.Lipnik, V.E.Mayes, D.K.Willis, R.G.Helmer

Precise Efficiency Calibration of an HPGe Detector: Source Measurements and Monte Carlo Calculations with Sub-percent Precision

doi: 10.1016/S0969-8043(01)00168-3
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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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2002TR08      Nucl.Phys. A701, 278c (2002)

R.E.Tribble, A.Azhari, C.A.Gagliardi, J.C.Hardy, A.Mukhamedzhanov, X.Tang, L.Trache, S.J.Yennello

Radioactive Beams at Texas A and M University

doi: 10.1016/S0375-9474(01)01597-4
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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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2001HE40      Trans.Amer.Nucl.Soc. 84, 328 (2001)

R.G.Helmer, J.C.Hardy, M.A.Ludington

Precise Relative and Absolute Ge Detector Efficiencies for Gamma Rays


2001SA73      Hyperfine Interactions 132, 223 (2001)

G.Savard, R.C.Barber, C.Boudreau, F.Buchinger, J.Caggiano, J.Clark, J.E.Crawford, H.Fukutani, S.Gulick, J.C.Hardy, A.Heinz, J.K.P.Lee, R.B.Moore, K.S.Sharma, J.Schwartz, D.Seweryniak, G.D.Sprouse, J.Vaz

The Canadian Penning Trap Spectrometer at Argonne

doi: 10.1023/A:1011986930931
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2000QU01      Nucl.Phys. A663-664, 903c (2000)

M.A.Quraan, P.Amaudruz, W.Andersson, M.Comyn, Yu.Davydov, P.Depommier, J.Doornbos, W.Faszer, C.A.Gagliardi, D.R.Gill, P.Green, P.Gumplinger, J.C.Hardy, M.Hasinoff, R.Helmer, R.Henderson, A.Khruchinsky, P.Kitching, D.D.Koetke, E.Korkmaz, Y.Lachin, D.Mass, J.A.Macdonald, R.Manweiler, T.Mathie, J.R.Musser, P.Nord, A.Olin, D.Ottewell, R.Openshaw, L.Piilonen, T.Porcelli, J.-M.Poutissou, R.Poutissou, N.L.Rodning, J.Schaapman, V.Selivanov, G.Sheffer, Y.Shin, F.Sobratee, J.Soukup, T.D.S.Stanislaus, G.Stinson, R.Tacik, V.Torokhov, R.E.Tribble, M.A.Vasiliev, H.K.Walter, D.Wright

A Precision Measurement of Muon Decay

doi: 10.1016/S0375-9474(99)00793-9
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1999SA76      Nucl.Phys. (Supplement) A654, 961c (1999)

G.Savard, R.C.Barber, F.Buchinger, J.E.Crawford, X.Feng, S.Gulick, G.Hackman, J.C.Hardy, J.K.P.Lee, R.B.Moore, K.S.Sharma, J.Uusitalo

Weak Interaction Studies with an On-Line Penning Trap Mass Spectrometer

doi: 10.1016/S0375-9474(00)88581-4
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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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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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1997KO65      Nucl.Instrum.Methods Phys.Res. A401, 289 (1997)

V.T.Koslowsky, E.Hagberg, J.C.Hardy, G.Savard, H.Schmeing, K.S.Sharma, X.J.Sun

The Half-Lives of 42Sc, 46V, 50Mn and 54Co

RADIOACTIVITY 42Sc, 46V, 50Mn, 54Co(β+) [from 42Ca, 46Ti, 50Cr, 54Fe(p, n)]; measured T1/2. Mass-separated sources.

doi: 10.1016/S0168-9002(97)01017-6
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1997SA60      Nucl.Phys. A626, 353c (1997)

G.Savard, R.C.Barber, D.Beeching, F.Buchinger, J.E.Crawford, S.Gulick, X.Feng, E.Hagberg, J.C.Hardy, V.T.Koslowsky, J.K.P.Lee, R.B.Moore, K.S.Sharma, M.Watson

The Canadian Penning Trap Mass Spectrometer

doi: 10.1016/S0375-9474(97)00557-5
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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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