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NSR database version of April 26, 2024.

Search: Author = B.R.Simpson

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2020VA03      Appl.Radiat.Isot. 160, 109070 (2020)

M.W.van Rooy, M.J.van Staden, B.R.S.Simpson, J.Lubbe

Activity determination of ¹⁸F using liquid scintillation beta-efficiency extrapolation and non-extrapolation methods

RADIOACTIVITY ¹⁸F(EC), (β⁺); measured decay products, Eβ, Iβ, Eγ, Iγ; deduced the absolute activity.

doi: 10.1016/j.apradiso.2020.109070
Citations: PlumX Metrics

2017PO15      Metrologia 54, 19 (2017)

S.Pomme, H.Stroh, J.Paepen, R.Van Ammel, M.Marouli, T.Altzitzoglou, M.Hult, K.Kossert, O.Nahle, H.Schrader, F.Juget, C.Bailat, Y.Nedjadi, F.Bochud, T.Buchillier, C.Michotte, S.Courte, M.W.van Rooy, M.J.van Staden, J.Lubbe, B.R.S.Simpson, A.Fazio, P.De Felice, T.W.Jackson, W.M.Van Wyngaardt, M.I.Reinhard, J.Golya, S.Bourke, T.Roy, R.Galea, J.D.Keightley, K.M.Ferreira, S.M.Collins, A.Ceccatelli, L.Verheyen, M.Bruggeman, B.Vodenik, M.Korun, V.Chiste, M.-N.Amiot

On decay constants and orbital distance to the Sun-part II: beta minus decay

RADIOACTIVITY ³H, ¹⁴C, ⁶⁰Co, ⁸⁵Kr, ⁹⁰Sr, ¹²⁴Sb, ^134,137Cs, ¹⁵⁴Eu(β^-); analyzed available data from radionuclide metrology laboratories, residuals from the exponential decay curves for annual oscillations; deduced systematic deviations from a purely exponential decay curve differ in amplitude and phase from one data set to another and appear attributable to instabilities in the instrumentation and measurement conditions, oscillations in phase with Earth's orbital distance to the Sun could not be observed, no apparent indications for systematic oscillations at a level of weeks or months.

doi: 10.1088/1681-7575/54/1/19
Citations: PlumX Metrics

2017PO16      Metrologia 54, 1 (2017)

S.Pomme, H.Stroh, J.Paepen, R.Van Ammel, M.Marouli, T.Altzitzoglou, M.Hult, K.Kossert, O.Nahle, H.Schrader, F.Juget, C.Bailat, Y.Nedjadi, F.Bochud, T.Buchillier, C.Michotte, S.Courte, M.W.van Rooy, M.J.van Staden, J.Lubbe, B.R.S.Simpson, A.Fazio, P.De Felice, T.W.Jackson, W.M.Van Wyngaardt, M.I.Reinhard, J.Golya, S.Bourke, T.Roy, R.Galea, J.D.Keightley, K.M.Ferreira, S.M.Collins, A.Ceccatelli, L.Verheyen, M.Bruggeman, B.Vodenik, M.Korun, V.Chiste, M.-N.Amiot

On decay constants and orbital distance to the Sun-part I: alpha decay

RADIOACTIVITY ²⁰⁹Po, ²²⁶Ra, ²²⁸Th, ²³⁰U, ²⁴¹Am(α); analyzeed two decades of data from various nuclear metrology institutes around the globe, residuals from the exponential decay curves for annual oscillations; deduced that systematic deviations from a purely exponential decay curve differ in amplitude and phase from one data set to another are attributable to instabilities in the instrumentation and measurement conditions, lack of apparent indications for systematic oscillations at a level of weeks or months.

doi: 10.1088/1681-7575/54/1/1
Citations: PlumX Metrics

2017PO17      Metrologia 54, 36 (2017)

S.Pomme, H.Stroh, J.Paepen, R.Van Ammel, M.Marouli, T.Altzitzoglou, M.Hult, K.Kossert, O.Nahle, H.Schrader, F.Juget, C.Bailat, Y.Nedjadi, F.Bochud, T.Buchillier, C.Michotte, S.Courte, M.W.van Rooy, M.J.van Staden, J.Lubbe, B.R.S.Simpson, A.Fazio, P.De Felice, T.W.Jackson, W.M.Van Wyngaardt, M.I.Reinhard, J.Golya, S.Bourke, T.Roy, R.Galea, J.D.Keightley, K.M.Ferreira, S.M.Collins, A.Ceccatelli, L.Verheyen, M.Bruggeman, B.Vodenik, M.Korun, V.Chiste, M.-N.Amiot

On decay constants and orbital distance to the Sun-part III: beta plus and electron capture decay

RADIOACTIVITY ²²Na, ⁵⁴Mn, ⁵⁵Fe, ⁵⁷Co, ⁶⁵Zn, ^82,85Sr, ¹⁰⁹Cd, ¹³³Ba, ¹⁵²Eu(EC), (β⁺), ⁹⁰Sr, ¹²⁴Sb(β^-); analyzed available data on repeated over periods from 200 d up to more than four decades at 14 laboratories across the globe, residuals from the exponential nuclear decay curves for annual oscillations; deduced that systematic deviations from a purely exponential decay curve differ from one data set to another attributable to instabilities in the instrumentation and measurement conditions, oscillations in phase with Earth's orbital distance to the sun could not be observed, lack of apparent indications for systematic oscillations at a level of weeks or months.

doi: 10.1088/1681-7575/54/1/36
Citations: PlumX Metrics

2016PO08      Phys.Lett. B 761, 281 (2016)

S.Pomme, H.Stroh, J.Paepen, R.Van Ammel, M.Marouli, T.Altzitzoglou, M.Hult, K.Kossert, O.Nahle, H.Schrader, F.Juget, C.Bailat, Y.Nedjadi, F.Bochud, T.Buchillier, C.Michotte, S.Courte, M.W.van Rooy, M.J.van Staden, J.Lubbe, B.R.S.Simpson, A.Fazio, P.De Felice, T.W.Jackson, W.M.Van Wyngaardt, M.I.Reinhard, J.Golya, S.Bourke, T.Roy, R.Galea, J.D.Keightley, K.M.Ferreira, S.M.Collins, A.Ceccatelli, M.Unterweger, R.Fitzgerald, D.E.Bergeron, L.Pibida, L.Verheyen, M.Bruggeman, B.Vodenik, M.Korun, V.Chiste, M.-N.Amiot

Evidence against solar influence on nuclear decay constants

RADIOACTIVITY ²⁰⁹Po, ²²⁶Ra, ²²⁸Th, ²³⁰U, ²⁴¹Am(α), ³H, ¹⁴C, ⁶⁰Co, ⁸⁵Kr, ⁹⁰Sr, ¹²⁴Sb, ^134,137Cs(β^-), ⁵⁴Mn, ⁵⁵Fe, ⁵⁷Co, ^82,85Sr, ¹⁰⁹Cd, ¹³³Ba(EC), ²²Na, ⁶⁵Zn, ²⁰⁷Bi(EC), (β⁺), ¹⁵²Eu(β^-), (EC), (β⁺); measured decay products; deduced decay constant vs. solar activity, exponential nature of nuclear decay.

doi: 10.1016/j.physletb.2016.08.038
Citations: PlumX Metrics

2008SI19      Appl.Radiat.Isot. 66, 929 (2008)

B.R.S.Simpson, W.M.van Wyngaardt

Absolute activity of ¹³³Ba by liquid scintillation coincidence counting using the 4π(e, X)-γ extrapolation technique

RADIOACTIVITY ¹³³Ba(EC); measured Eγ, Iγ, (electron)γ-coin; deduced source activity.

doi: 10.1016/j.apradiso.2008.02.036
Citations: PlumX Metrics

2004SI04      Appl.Radiat.Isot. 60, 465 (2004)

B.R.S.Simpson, W.M.Morris

The standardization of ³³P by the TDCR efficiency calculation technique

RADIOACTIVITY ³³P(β^-); measured βγ-coin. Triple-to-double coincidence ratio.

doi: 10.1016/j.apradiso.2003.11.060
Citations: PlumX Metrics

2000SI03      Appl.Radiat.Isot. 52, 551 (2000)

B.R.S.Simpson, T.P.Ntsoane

Decay Scheme of ⁶⁷Ga

RADIOACTIVITY ⁶⁷Ga(EC); measured Eγ, Iγ, Xγ-coin, delayed E(ce); deduced branching strength to ground state. ⁶⁷Zn transition deduced ICC.

doi: 10.1016/S0969-8043(99)00209-2
Citations: PlumX Metrics

1996SI14      Nucl.Instrum.Methods Phys.Res. A369, 340 (1996)

B.R.S.Simpson, B.R.Meyer

Activity Measurement of ²⁰⁴Tl by Direct Liquid Scintillation Method

RADIOACTIVITY ²⁰⁴Tl(β^-), (EC); measured activity. 4π (X, e)-X(K) coincidence counting.

doi: 10.1016/S0168-9002(96)80005-2
Citations: PlumX Metrics

1994SI21      Nucl.Instrum.Methods Phys.Res. A339, 14 (1994)

B.R.S.Simpson, B.R.Meyer

Direct Activity Measurement of Pure Beta-Emitting Radionuclides by the TDCR Efficiency Calculation Technique

RADIOACTIVITY ³H(β^-); ⁶³Ni(β^-); ¹⁴C(β^-); ⁹⁹Tc(β^-); measured activity. Triple-to-double coincidence ratio efficiency calculation technique.

doi: 10.1016/0168-9002(94)91771-X
Citations: PlumX Metrics

1994SI26      Appl.Radiat.Isot. 45, 669 (1994)

B.R.S.Simpson, B.R.Meyer

Standardization and Half-Life of ²⁰¹Tl by the 4π(x, e)-γ Coincidence Method with Liquid Scintillation Counting in the 4π-Channel

RADIOACTIVITY ²⁰¹Tl(EC); measured (X-ray)γ-, (electron)γ-coin; deduced source standardization. ²⁰¹Tl deduced T_1/2. Liquid scintillation counting in 4π channel.

doi: 10.1016/0969-8043(94)90245-3
Citations: PlumX Metrics

1993AL14      Phys.Lett. 314B, 173 (1993)

M.S.Allie, F.D.Brooks, D.G.Aschman, A.Buffler, W.A.Cilliers, R.W.Fearick, C.G.L.Henderson, M.J.Oliver, M.R.Nchodu, S.M.Perez, D.Steyn, W.R.McMurray, B.R.S.Simpson, F.D.Smit, H.G.Miller, K.Bharuth-Ram, I.J.van Heerden

Differential Cross Section for n-p Radiative Capture at E(n) = 63.4 MeV

NUCLEAR REACTIONS ¹H(n, γ), E=63.4 MeV; measured Iγ(θ); deduced σ(θ) for ²H(γ, p), E ≈ 34 MeV. Legendre polymonial fits.

doi: 10.1016/0370-2693(93)90445-N
Citations: PlumX Metrics

1992ST15      Appl.Radiat.Isot. 43, 1323 (1992)

G.F.Steyn, B.R.S.Simpson, S.J.Mills, F.M.Nortier

The Production of ⁵⁵Fe with Medium-Energy Protons

NUCLEAR REACTIONS ⁵⁵Mn, ⁵⁹Co, Ni(p, X)⁵⁵Fe, E=threshold-100 MeV; measured residual production rates. Thick target. Model comparison.

doi: 10.1016/0883-2889(92)90003-W
Citations: PlumX Metrics
Data from this article have been entered in the EXFOR database. For more information, access X4 datasetO0530.

1991SI11      Appl.Radiat.Isot. 42, 811 (1991)

B.R.S.Simpson

Deadtime Measurement and Associated Statistical Uncertainty by Means of a Two-Detector Paired-Source Method

doi: 10.1016/0883-2889(91)90216-N
Citations: PlumX Metrics

1990ME05      Appl.Radiat.Isot. 41, 375 (1990)

B.R.Meyer, B.R.S.Simpson

A Direct Method for ⁵⁵Fe Activity Measurement

RADIOACTIVITY ⁵⁵Fe; measured activity. Direct method, theoretical counting efficiency, liquid scintillators.

doi: 10.1016/0883-2889(90)90146-8
Citations: PlumX Metrics

1990ST03      Appl.Radiat.Isot. 41, 315 (1990)

G.F.Steyn, S.J.Mills, F.M.Nortier, B.R.S.Simpson, B.R.Meyer

Production of ⁵²Fe via Proton-Induced Reactions on Manganese and Nickel

NUCLEAR REACTIONS, ICPND ⁵⁵Mn(p, 4n), E=40-200 MeV; ²⁷Al(p, X)²²Na, E=75-200 MeV; Ni(p, X)⁵²Fe, E=45-200 MeV; measured residual production σ(E).

doi: 10.1016/0883-2889(90)90197-O
Citations: PlumX Metrics
Data from this article have been entered in the EXFOR database. For more information, access X4 datasetA0497.

1989SI19      Appl.Radiat.Isot. 40, 819 (1989)

B.R.S.Simpson, B.R.Meyer

The Half-Life of ¹²⁵I

RADIOACTIVITY ¹²⁵I(EC); measured T_1/2. Linearized weighted least square data analysis, direct activity measurement.

doi: 10.1016/0883-2889(89)90103-2
Citations: PlumX Metrics

1989SI23      Nucl.Phys. A505, 361 (1989)

B.R.S.Simpson, F.D.Brooks

Analyzing Power in Neutron-Proton Scattering at 21.6 MeV

NUCLEAR REACTIONS ¹H(polarized n, n), E=21.6 MeV; measured A(θ); deduced spin-orbit splitting parameters. Anthracene crystal target.

doi: 10.1016/0375-9474(89)90380-1
Citations: PlumX Metrics
Data from this article have been entered in the EXFOR database. For more information, access X4 dataset30970.