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NSR database version of March 2, 2024.

Search: Author = R.G.Helmer

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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
Citations: PlumX Metrics


2006HE06      Nucl.Data Sheets 107, 507 (2006)

R.G.Helmer

Nuclear Data Sheets for A = 153

COMPILATION 153La, 153Ce, 153Pr, 153Nd, 153Pm, 153Sm, 153Eu, 153Gd, 153Tb, 153Dy, 153Ho, 153Er, 153Tm, 153Yb, 153Lu, 153Hf; compiled, evaluated structure data.

doi: 10.1016/j.nds.2006.02.001
Citations: PlumX Metrics


2004HE05      Nucl.Data Sheets 101, 325 (2004)

R.G.Helmer

Nuclear Data Sheets for A = 158

COMPILATION 158Nd, 158Pm, 158Sm, 158Eu, 158Gd, 158Tb, 158Dy, 158Ho, 158Er, 158Tm, 158Yb, 158Lu, 158Hf, 158Ta, 158W; compiled, evaluated structure data.

doi: 10.1016/j.nds.2004.02.001
Citations: PlumX Metrics


2004HE29      Nucl.Data Sheets 103, 565 (2004)

R.G.Helmer

Nuclear Data Sheets for A = 157

COMPILATION 157Nd, 157Pm, 157Sm, 157Eu, 157Gd, 157Tb, 157Dy, 157Ho, 157Er, 157Tm, 157Yb, 157Lu, 157Hf, 157Ta; compiled, evaluated structure data.

doi: 10.1016/j.nds.2004.11.007
Citations: PlumX Metrics


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
Citations: PlumX Metrics


2004VO16      Phys.Rev.Lett. 93, 172501 (2004)

C.Vockenhuber, F.Oberli, M.Bichler, I.Ahmad, G.Quitte, M.Meier, A.N.Halliday, D.-C.Lee, W.Kutschera, P.Steier, R.J.Gehrke, R.G.Helmer

New Half-Life Measurement of 182Hf: Improved Chronometer for the Early Solar System

RADIOACTIVITY 182Hf(β-); measured T1/2. Neutron activation, isotope dilution, activity measurement. Astrophysical implications discussed.

doi: 10.1103/PhysRevLett.93.172501
Citations: PlumX Metrics


2003HE11      Nucl.Data Sheets 99, 483 (2003)

R.G.Helmer

Nuclear Data Sheets for A = 159

COMPILATION 159Pm, 159Sm, 159Eu, 159Gd, 159Tb, 159Dy, 159Ho, 159Er, 159Tm, 159Yb, 159Lu, 159Hf, 159Ta, 159W; compiled, evaluated structure data.

doi: 10.1006/ndsh.2003.0010
Citations: PlumX Metrics


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
Citations: PlumX Metrics


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
Citations: PlumX Metrics


2002HE09      Nucl.Data Sheets 95, 543 (2002)

R.G.Helmer

Nuclear Data Sheets for A = 87

COMPILATION 87Ge, 87As, 87Se, 87Br, 87Kr, 87Rb, 87Sr, 87Y, 87Zr, 87Nb, 87Mo, 87Tc, 87Ru; compiled, evaluated structure data.

doi: 10.1006/ndsh.2002.0006
Citations: PlumX Metrics


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


2000HE14      Nucl.Instrum.Methods Phys.Res. A450, 35 (2000)

R.G.Helmer, C.van der Leun

Recommended Standards for γ-Ray Energy Calibration (1999)

COMPILATION 7Be, 22,24Na, 44Ti, 46Sc, 51Cr, 54Mn, 56,57,58,60Co, 59Fe, 65Zn, 66Ga, 75Se, 82Br, 84Rb, 85Sr, 88Y, 94Nb, 95Zr, 95mTc, 99Mo, 106Ru, 108m,110mAg, 109Cd, 113,125Sn, 124,125Sb, 132,137Cs, 133Ba, 139,141,144Ce, 152,154Eu, 153Sm, 153Gd, 160,161Tb, 166mHo, 169Yb, 170Tm, 172Hf, 182Ta, 185Os, 192Ir, 198,199Au, 203,210Pb, 203Hg, 207Bi, 228Th, 241Am; compiled γ-ray calibration standards.

doi: 10.1016/S0168-9002(00)00252-7
Citations: PlumX Metrics


2000LU08      Nucl.Instrum.Methods Phys.Res. A446, 506 (2000)

M.A.Ludington, R.G.Helmer

High Accuracy Measurements and Monte Carlo Calculations of the Relative Efficiency Curve of an HPGe Detector from 433 to 2754 KeV

RADIOACTIVITY 108mAg(IT), (β-); 108Ag(β-); analyzed, evaluated data; deduced γ-ray intensities.

doi: 10.1016/S0168-9002(99)01253-X
Citations: PlumX Metrics


2000RE14      Nucl.Data Sheets 90, 645 (2000)

C.W.Reich, R.G.Helmer

Nuclear Data Sheets for A = 161

COMPILATION 161Sm, 161Eu, 161Gd, 161Tb, 161Dy, 161Ho, 161Er, 161Tm, 161Yb, 161Lu, 161Hf, 161Ta, 161W, 161Re; compiled, analyzed structure data.

doi: 10.1006/ndsh.2000.0013
Citations: PlumX Metrics


1999HE10      Nucl.Instrum.Methods Phys.Res. A422, 525 (1999)

R.G.Helmer, C.van der Leun

Recommended Standards for γ-Ray Energy Calibration

COMPILATION A=7-241; compiled, evaluated Eγ from several sources; deduced recommended γ calibration standards.

doi: 10.1016/S0168-9002(98)01079-1
Citations: PlumX Metrics


1999HE21      Nucl.Data Sheets 87, 317 (1999)

R.G.Helmer, C.W.Reich

Nuclear Data Sheets for A = 162

COMPILATION 162Eu, 162Gd, 162Tb, 162Dy, 162Ho, 162Er, 162Tm, 162Yb, 162Lu, 162Hf, 162Ta, 162W, 162Re, 162Os; compiled, analyzed structure data.

doi: 10.1006/ndsh.1999.0022
Citations: PlumX Metrics


1998HE06      Nucl.Data Sheets 83, 285 (1998)

R.G.Helmer

Nuclear Data Sheets for A = 153

COMPILATION 153La, 153Ce, 153Pr, 153Nd, 153Pm, 153Sm, 153Eu, 153Gd, 153Tb, 153Dy, 153Ho, 153Er, 153Tm, 153Yb, 153Lu; compiled, evaluated structure data.

doi: 10.1006/ndsh.1998.0003
Citations: PlumX Metrics


1998RE22      Nucl.Data Sheets 85, 171 (1998)

C.W.Reich, R.G.Helmer

Nuclear Data Sheets for A = 154

COMPILATION 154Ce, 154Pr, 154Nd, 154Pm, 154Sm, 154Eu, 154Gd, 154Tb, 154Dy, 154Ho, 154Er, 154Tm, 154Yb, 154Lu, 154Hf; compiled, evaluated structure data.

doi: 10.1006/ndsh.1998.0020
Citations: PlumX Metrics


1997GR09      Nucl.Instrum.Methods Phys.Res. A390, 95 (1997)

R.C.Greenwood, R.G.Helmer, M.H.Putnam, K.D.Watts

Measurement of β--Decay Intensity Distributions of Several Fission-Product Isotopes using a Total Absorption γ-Ray Spectrometer

RADIOACTIVITY 138mCs, 90mRb(β-), (IT); 89,91,93,90Rb(β-); 93,94,95Sr, 94,95Y, 138,139,140,141Cs, 141,142,145,143,144Ba, 142,143,144,145La, 145,146,147,148Ce, 146,147,148Pr, 154,155,149,151,152,153Nd, 152,153,154,155,156,157Pm, 157,158Sm, 158Eu(β-); measured Eβ, Iβ; deduced Iβ distributions. Total absorption γ-ray spectrometer. Sources from 252Cf(SF-decay).

doi: 10.1016/S0168-9002(97)00356-2
Citations: PlumX Metrics


1996HE06      Nucl.Data Sheets 77, 471 (1996)

R.G.Helmer

Nuclear Data Sheets for A = 158

COMPILATION 158Pm, 158Sm, 158Eu, 158Gd, 158Tb, 158Dy, 158Ho, 158Er, 158Tm, 158Yb, 158Lu, 158Hf, 158Ta, 158W; compiled, evaluated structure data.

doi: 10.1006/ndsh.1996.0006
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1996HE17      Nucl.Data Sheets 78, 219 (1996)

R.G.Helmer

Nuclear Data Sheets for A = 157

COMPILATION 157Nd, 157Pm, 157Sm, 157Gd, 157Tb, 157Dy, 157Ho, 157Er, 157Tm, 157Yb, 157Lu, 157Hf, 157Ta; compiled, evaluated structure data.

doi: 10.1006/ndsh.1996.0009
Citations: PlumX Metrics


1994GE13      Nucl.Instrum.Methods Phys.Res. A353, 109 (1994)

R.J.Gehrke, K.D.Watts, E.W.Killian, M.H.Putnam, R.G.Helmer

PASS, an Extended-Range Ge Spectrometer for Radionuclide Analysis Via L X-, γ-Ray Spectrometry

RADIOACTIVITY 239Pu, 241Am(α); 60Co, 137Cs(β-); analyzed data; deduced extended range Ge spectrometer characteristics for radionuclide analysis.

doi: 10.1016/0168-9002(94)91614-4
Citations: PlumX Metrics


1994HE08      Phys.Rev. C49, 1845 (1994)

R.G.Helmer, C.W.Reich

An Excited State of 229Th at 3.5 eV

RADIOACTIVITY 233U(α); measured Eγ, high precision. 229Th deduced level energy.

doi: 10.1103/PhysRevC.49.1845
Citations: PlumX Metrics


1994HE21      Nucl.Data Sheets 72, 83 (1994)

R.G.Helmer

Nuclear Data Sheets Update for A = 159

COMPILATION 159Sm, 159Eu, 159Gd, 159Tb, 159Dy, 159Ho, 159Er, 159Tm, 159Yb, 159Lu, 159Hf, 159Ta, 159W; compiled, evaluated structure data.

doi: 10.1006/ndsh.1994.1023
Citations: PlumX Metrics


1994HE26      Nucl.Instrum.Methods Phys.Res. A351, 406 (1994); Erratum Nucl.Instrum.Methods Phys.Res. A361, 628 (1995)

R.G.Helmer, M.H.Putnam, R.C.Greenwood, H.Willmes

Methodology for the Measurement of β--Decay Intensity Distributions from the Analysis of Total Absorption γ-Ray Spectra

RADIOACTIVITY 90Sr(β-); 106Ru(β-); measured βγ-coin. 141Cs(β-); measured Eγ, Iγ, βγ-coin; deduced Iβ distributions. Total absorption γ-spectrometer.

doi: 10.1016/0168-9002(94)91370-6
Citations: PlumX Metrics


1994HE33      Nucl.Instrum.Methods Phys.Res. A339, 189 (1994)

R.G.Helmer, R.C.Greenwood, K.D.Watts, M.H.Putnam

Beta-Particle Feeding Distributions for 138-141Cs from Total Absorption Gamma-Ray Spectrometer (TAGS)

RADIOACTIVITY 138mCs(IT), (β-); 138,139,140,141Cs(β-); measured γγ-coin, sum spectra. 138,139,140,141Cs levels deduced β-feeding distribution.

doi: 10.1016/0168-9002(94)91803-1
Citations: PlumX Metrics


1994HE45      Nucl.Instrum.Methods Phys.Res. A353, 222 (1994)

R.G.Helmer, R.C.Greenwood, M.H.Putnam, K.D.Watts

Beta-Decay Intensity Distributions for the Fission Products 139Cs and 140Cs Measured with a Total Absorption γ-Ray Spectrometer

RADIOACTIVITY 140,139Cs(β-) [from 252Cf(SF)]; measured Eγ, Iγ, βγ-coin, Iβ, Eβ; deduced Iβ. Total absorption γ-spectrometer.

doi: 10.1016/0168-9002(94)91643-8
Citations: PlumX Metrics


1993HE11      Nucl.Data Sheets 69, 507 (1993)

R.G.Helmer

Nuclear Data Sheets Update for A = 154

COMPILATION 154Pr, 154Nd, 154Pm, 154Sm, 154Eu, 154Gd, 154Tb, 154Dy, 154Ho, 154Er, 154Tm, 154Yb, 154Lu, 154Hf; compiled, evaluated structure data.

doi: 10.1006/ndsh.1993.1035
Citations: PlumX Metrics


1993HE18      Nucl.Instrum.Methods Phys.Res. A330, 434 (1993); Erratum Nucl.Instrum.Methods Phys.Res. A361, 629 (1995)

R.G.Helmer

γ-Ray Energies for Calibration from the Decay of 161Tb, 172Hf + 172Lu, and 241Am

RADIOACTIVITY 161Tb(β-); 172Hf, 172Lu(EC); 241Am(α); measured Eγ, Iγ; deduced 172Hf suitability as calibration source. 237Np deduced transition energy. Small Si(Li), planar hyperpure Ge detector.

doi: 10.1016/0168-9002(93)90572-Y
Citations: PlumX Metrics


1992GR18      Nucl.Instrum.Methods Phys.Res. A314, 514 (1992)

R.C.Greenwood, R.G.Helmer, M.A.Lee, M.H.Putnam, M.A.Oates, D.A.Struttmann, K.D.Watts

Total Absorption Gamma-Ray Spectrometer for Measurement of Beta-Decay Intensity Distributions for Fission Product Radionuclides

RADIOACTIVITY 137Cs(β-), 24Na(β-), 60Co(β-), 110mAg(β-), (IT); measured Eγ, Iγ. 141Ba(β-); 140,139Cs(β-); measured γ-, β-spectra, βγ-coin. Fission products, total absorption γ-ray spectrometer.

doi: 10.1016/0168-9002(92)90243-W
Citations: PlumX Metrics


1992HE01      Nucl.Data Sheets 65, 65 (1992)

R.G.Helmer

Nuclear Data Sheets Update for A = 156

COMPILATION 156Nd, 156Pm, 156Sm, 156Eu, 156Gd, 156Tb, 156Dy, 156Ho, 156Er, 156Tm, 156Yb, 156Lu, 156Hf, 156Ta; compiled, evaluated structure data.

doi: 10.1016/0090-3752(92)80006-6
Citations: PlumX Metrics


1991HE13      Nucl.Data Sheets 64, 79 (1991)

R.G.Helmer

Nuclear Data Sheets for A = 162

COMPILATION 162Eu, 162Gd, 162Tb, 162Dy, 162Ho, 162Er, 162Tm, 162Yb, 162Lu, 162Hf, 162Ta, 162W, 162Re, 162Os; compiled, evaluated structure data.

doi: 10.1016/S0090-3752(05)80014-6
Citations: PlumX Metrics


1990HE02      Appl.Radiat.Isot. 41, 101 (1990)

R.G.Helmer

181Hf Gamma-Emission Probabilities

RADIOACTIVITY 181Hf; measured relative Iγ, Eγ; deduced γ-emission probabilities.

doi: 10.1016/0883-2889(90)90137-6
Citations: PlumX Metrics


1990HE05      Appl.Radiat.Isot. 41, 75 (1990)

R.G.Helmer

Selected Gamma-Ray Energies and Emission Probabilities for the Decay of 125Sb and 154Eu

RADIOACTIVITY 125Sb, 154Eu; measured Eγ, Iγ; deduced relative γ-emission probabilities.

doi: 10.1016/0883-2889(90)90133-2
Citations: PlumX Metrics


1990HE07      Nucl.Data Sheets 59, 1 (1990)

R.G.Helmer

Nuclear Data Sheets for A = 161

COMPILATION 161Eu, 161Gd, 161Tb, 161Dy, 161Ho, 161Er, 161Tm, 161Yb, 161Lu, 161Hf, 161Ta, 161W, 161Re; compiled, evaluated structure data.

doi: 10.1016/S0090-3752(05)80079-1
Citations: PlumX Metrics


1990HE16      Appl.Radiat.Isot. 41, 791 (1990)

R.G.Helmer

Relative Gamma-Ray Emission Probability for the Decay of 207Bi

RADIOACTIVITY 207Bi; measured relative γ-emission probability following decay.

doi: 10.1016/0883-2889(90)90031-B
Citations: PlumX Metrics


1990HE18      Nucl.Data Sheets 61, 93 (1990)

R.G.Helmer, M.A.Lee

Nuclear Data Sheets for A = 206

COMPILATION 206Hg, 206Tl, 206Pb, 206Bi, 206Po, 206At, 206Rn, 206Fr, 206Ra; compiled, evaluated structure data.

doi: 10.1016/S0090-3752(05)80132-2
Citations: PlumX Metrics


1990RE03      Phys.Rev.Lett. 64, 271 (1990)

C.W.Reich, R.G.Helmer

Energy Separation of the Doublet of Intrinsic States at the Ground States of 229Th

RADIOACTIVITY 233U(α); measured Eγ, Iγ. 229Th deduced low energy doublet separation.

doi: 10.1103/PhysRevLett.64.271
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1988HE14      Nucl.Data Sheets 55, 71 (1988)

R.G.Helmer

Nuclear Data Sheets for A = 157

COMPILATION 157Pm, 157Sm, 157Eu, 157Gd, 157Tb, 157Dy, 157Ho, 157Er, 157Tm, 157Yb, 157Lu, 157Hf, 157Ta; compiled, evaluated structure data.

doi: 10.1016/S0090-3752(88)80035-8
Citations: PlumX Metrics


1987HE20      Nucl.Data Sheets 51, 1 (1987)

R.G.Helmer

Nuclear Data Sheets for A = 154

COMPILATION 154Nd, 154Pm, 154Sm, 154Eu, 154Gd, 154Tb, 154Dy, 154Ho, 154Er, 154Tm, 154Yb, 154Lu, 154Hf; compiled, evaluated structure data.


1987HE28      Nucl.Phys. A474, 77 (1987)

R.G.Helmer, M.A.Lee, C.W.Reich, I.Ahmad

Intrinsic Reflection Asymmetry in 225Ra: Additional information from a study of the α-decay scheme of 229Th

RADIOACTIVITY 229Th(α); measured E(α), I(α), E(γ), I(γ), αγ-, γγ-, γ(ce)-coin. 225Ra deduced levels, J, π, K.

doi: 10.1016/0375-9474(87)90195-3
Citations: PlumX Metrics


1986HE06      Int.J.Appl.Radiat.Isotop. 37, 139 (1986)

R.G.Helmer, C.W.Reich, M.A.Lee, I.Ahmad

Emission Probabilities of γ-Rays Associated with the Decay of 229Th and Its Daughters

RADIOACTIVITY 229Th(α); 225Ra(β-) [from 229Th decay]; 225Ac(α) [from 225Ra decay]; 221Fr(α) [from 225Ac decay]; 217At(α) [from 221Fr decay]; 213Bi(β-), (α) [from 217At decay]; 209Tl(β-) [from 213Bi decay]; 213Po [from 213Bi decay]; 209Pb(β-) [from 209Tl, 213Po decay]; measured Eγ, Iγ; deduced γ-emission probabilities. 225Ra level deduced intensity balance. High precision.

doi: 10.1016/0883-2889(86)90062-6
Citations: PlumX Metrics


1986HE12      Nucl.Instrum.Methods Phys.Res. A242, 475 (1986)

R.G.Helmer, C.W.Reich

International Program to Improve Decay Data for Transactinium Nuclides

RADIOACTIVITY 232,233,235U, 238,239,240,241Pu, 229Th(α); 233Pa(β-); measured Eγ, γ-emission probabilities. Calibrated Ge detectors.

doi: 10.1016/0168-9002(86)90449-3
Citations: PlumX Metrics


1986HE19      Nucl.Data Sheets 49, 383 (1986)

R.G.Helmer

Nuclear Data Sheets for A = 156

COMPILATION 156Sm, 156Eu, 156Gd, 156Tb, 156Dy, 156Ho, 156Er, 156Tm, 156Yb, 156Lu, 156Hf; compiled, evaluated structure data.

doi: 10.1016/S0090-3752(86)80029-1
Citations: PlumX Metrics


1985HE02      Int.J.Appl.Radiat.Isotop. 36, 117 (1985)

R.G.Helmer, C.W.Reich

Emission Probabilities of γ-Ray Transitions Associated with the Decay of 241Pu and 237U

RADIOACTIVITY 241Pu(α), (β-); 237U(β-) [from 241Pu(α-decay)]; measured γ-emission probabilities. 237U, 237Np transitions deduced average γ-emission rates.

doi: 10.1016/0020-708X(85)90225-X
Citations: PlumX Metrics


1985HE10      Nucl.Data Sheets 44, 659 (1985)

R.G.Helmer

Nuclear Data Sheets for A = 162

COMPILATION 162Gd, 162Tb, 162Dy, 162Ho, 162Er, 162Tm, 162Yb, 162Lu, 162Hf, 162Ta, 162W, 162Re; compiled, evaluated structure data.

doi: 10.1016/S0090-3752(85)80054-5
Citations: PlumX Metrics


1984HE12      Int.J.Appl.Radiat.Isotop. 35, 783 (1984)

R.G.Helmer, C.W.Reich

Emission Probabilities and Energies of γ-Ray Transitions from the Decay of 235U

RADIOACTIVITY 235U(α); 231Th(β-) [from 235U(α-decay)]; measured Eγ, emission probabilities. 182Ta, 109Cd, 231Pa deduced transition energies.

doi: 10.1016/0020-708X(84)90087-5
Citations: PlumX Metrics


1984HE18      Nucl.Data Sheets 43, 1 (1984)

R.G.Helmer

Nuclear Data Sheets for A = 161

COMPILATION 161Tm, 161Yb, 161Lu, 161Hf, 161Ta, 161W, 161Re; compiled, evaluated structure data.

doi: 10.1016/S0090-3752(84)80100-3
Citations: PlumX Metrics


1984HE19      Int.J.Appl.Radiat.Isotop. 35, 1067 (1984)

R.G.Helmer, C.W.Reich

Emission Probabilities and Energies of γ-Ray Transitions from the Decay of 238Pu

RADIOACTIVITY 238Pu(α) [from 237Np(n, γ)238Np(β--decay)]; measured Eγ, Iγ, γ-emission probabilities. 234U deduced transition energies, associated emission probabilities.

doi: 10.1016/0020-708X(84)90012-7
Citations: PlumX Metrics


1984RE05      Int.J.Appl.Radiat.Isotop. 35, 185 (1984)

C.W.Reich, R.G.Helmer, J.D.Baker, R.J.Gehrke

Emission Probabilities and Energies of γ-Ray Transitions from the Decay of 233U

RADIOACTIVITY 233U(α); measured γ-emission rates, Eγ following α-decay.

doi: 10.1016/0020-708X(84)90232-1
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1983HE08      Phys.Rev. C27, 2248 (1983)

R.G.Helmer, C.W.Reich

Levels in 20484Po from the Decay of 20485At

RADIOACTIVITY 204At(EC), (β+) [from Ir(16O, xn)]; measured Eγ, Iγ, γγ(t), γγ-coin. 204At level deduced J, π. 204Po deduced levels, J, π, isomer T1/2. On-line isotope separated sources, Ge(Li), Si(Li) detectors.

doi: 10.1103/PhysRevC.27.2248
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1982HE02      Int.J.Appl.Radiat.Isotop. 33, 23 (1982)

R.G.Helmer, C.W.Reich, R.J.Gehrke, J.D.Baker

Emission Probabilities and Energies of γ-Ray Transitions from the 239Pu Decay

RADIOACTIVITY 239Pu; measured Eγ, relative Iγ following α-decay; deduced emission probabilities.

doi: 10.1016/0020-708X(82)90201-0
Citations: PlumX Metrics


1981HE15      Nucl.Instrum.Methods 188, 671 (1981)

R.G.Helmer, A.J.Caffrey, R.J.Gehrke, R.C.Greenwood

γ-Ray Energies from the Decay of 99Mo, 133Ba and 210Pb

RADIOACTIVITY 99Mo, 133Ba, 210Pb; measured Eγ. Coaxial Ge detector.

doi: 10.1016/0029-554X(81)90281-0
Citations: PlumX Metrics


1981HE16      Int.J.Appl.Radiat.Isotop. 32, 829 (1981)

R.G.Helmer, C.W.Reich

Emission Probabilities and Energies of the Prominent γ-Ray Transitions from the 240Pu Decay

RADIOACTIVITY 240Pu; measured Eγ, γ-emission probabilities. Calibrated Ge spectrometers.

doi: 10.1016/0020-708X(81)90160-5
Citations: PlumX Metrics


1979GE08      Nucl.Sci.Eng. 70, 298 (1979)

R.J.Gehrke, R.G.Helmer, C.W.Reich

Emission Probability of the 312-keV Gamma Ray from the Decay of Protactinium-233

RADIOACTIVITY 233Pa [from 237Np, chemical separation]; measured Iγ, βγ-coin, I(K X-ray)/Iγ. 233U transition deduced Eγ.

doi: 10.13182/NSE79-A20151
Citations: PlumX Metrics


1979GR01      Nucl.Instrum.Methods 159, 465 (1979)

R.C.Greenwood, R.G.Helmer, R.J.Gehrke

Precise γ-Ray Energies for Calibration of Ge Semiconductor Spectrometers to 3.5 MeV

RADIOACTIVITY 24Na, 48V, 56,58,60Co, 82Br, 84Rb, 88Y, 110mAg, 124Sb, 125Sn, 132Cs, 144Ce, 207Bi, 228Th; measured Eγ within 5-15 eV, referenced to 411.80441 keV γ-ray of 198Au; deduced calibration standards in Ge semiconductor spectroscopy up to 3.5 MeV.

doi: 10.1016/0029-554X(79)90675-X
Citations: PlumX Metrics


1979HE01      Nucl.Instrum.Methods 158, 489 (1979)

R.G.Helmer, J.W.Starner, M.E.Bunker

γ-Ray Energies for 88Rb Decay

RADIOACTIVITY 88mRb; measured Eγ, Iγ. 88Y deduced levels, branching ratio.

doi: 10.1016/S0029-554X(79)95100-0
Citations: PlumX Metrics


1979HE10      Nucl.Instrum.Methods 164, 355 (1979)

R.G.Helmer

γ-Ray Energies for 228Ra-228Ac Decay and the 228Th Decay Chain

RADIOACTIVITY 228Ac, 212Bi, 212Pb, 212mPo [from 228Ra source]; measured Eγ. 228Th deduced levels.

doi: 10.1016/0029-554X(79)90255-6
Citations: PlumX Metrics


1979HE12      Int.J.Appl.Radiat.Isotop. 30, 15 (1979)

R.G.Helmer, R.J.Gehrke

γ-Ray Intensities from 197Hg (64 h) Decay

RADIOACTIVITY 197Hg [from n-irradiation of 196Hg]; measured relative Iγ.

doi: 10.1016/0020-708X(79)90091-7
Citations: PlumX Metrics


1979HE13      Nucl.Instrum.Methods 166, 547 (1979)

R.G.Helmer, R.J.Gehrke, R.C.Greenwood

γ-Ray Energies for 40K, 108mAg and the 226Ra Decay Chain

RADIOACTIVITY 40K, 108mAg, 226Ra; measured Eγ; deduced calibration for Ge semiconductor detectors.

doi: 10.1016/0029-554X(79)90548-2
Citations: PlumX Metrics


1979HE19      At.Data Nucl.Data Tables 24, 39 (1979)

R.G.Helmer, P.H.M.Van Assche, C.Van der Leun

Recommended Standards for Gamma-Ray Energy Calibration (1979)

COMPILATION A=7-228; compiled, evaluated Eγ from different sources; deduced Eγ calibration standards.

doi: 10.1016/0092-640X(79)90038-X
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1979RE01      Phys.Rev. C19, 188 (1979)

C.W.Reich, R.G.Helmer, R.J.Gehrke

Energy Levels of 250Cf Populated in the β- Decay of 250Bk

RADIOACTIVITY 250Bk [from 254Es-α decay]; measured Eγ, Iγ, γγ-coin, βγ-coin, T1/2. 250Cf deduced levels, J, π, log ft. Ge(Li), Si(Li) detectors, chemical separation.

doi: 10.1103/PhysRevC.19.188
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1978HE21      Nucl.Instrum.Methods 155, 189 (1978)

R.G.Helmer, R.C.Greenwood, R.J.Gehrke

Reevaluation of Precise γ-Ray Energies for Calibration of Ge(Li) Spectrometers

COMPILATION 51Cr, 57,60Co, 109Cd, 137Cs, 139,141Ce, 145Eu, 153Sm, 160Tb, 169Yb, 170Tm, 183Ta, 198,199Au, 203Hg, 241Am, 192Ir, 182Ta, 152Eu, 153Gd, 169Yb, 7Be, 22Na, 46Sc, 54Mn, 58Co, 59Fe, 65Zn, 75Se, 85Sr, 88Y, 94,95Nb, 95Zr, 95mTc, 113Sn, 133Ba, 185Os, 203Pb, 207Bi, 228Th; compiled, reevaluated Eγ, measurement relative to 411-keV γ-ray from 198Au. Curved-crystal diffraction spectrum.

doi: 10.1016/0029-554X(78)90204-5
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1977GE10      Int.J.Appl.Radiat.Isotop. 28, 744 (1977)

R.J.Gehrke, R.G.Helmer

Absolute γ-Ray Intensities from 127Xe Decay

RADIOACTIVITY 127Xe; measured absolute Iγ, relative Iγ, Eγ.

doi: 10.1016/0020-708X(77)90101-6
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1977GE12      Nucl.Instrum.Methods 147, 405 (1977)

R.J.Gehrke, R.G.Helmer, R.C.Greenwood

Precise Relative γ-Ray Intensities for Calibration of Ge Semiconductor Detectors

RADIOACTIVITY 56Co, 75Se, 82Br, 110mAg, 125Sb, 133Ba, 140Ba, 140La, 144Ce, 144Pr, 152Eu, 166mHo, 169Yb, 182Ta, 228Th, 208Tl; measured precise relative Iγ.

doi: 10.1016/0029-554X(77)90276-2
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1977HE05      Phys.Rev. C15, 1453 (1977)

R.G.Helmer, C.W.Reich, R.J.Gehrke, R.C.Greenwood, R.A.Anderl

Decay of 128Cs

RADIOACTIVITY 128Cs; measured Eγ, Iγ, γγ-coin; deduced log ft. 128Xe deduced levels, J, π. Isotope separation, Ge(Li) detectors.

doi: 10.1103/PhysRevC.15.1453
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1976GE10      J.Inorg.Nucl.Chem. 38, 1929 (1976)

R.J.Gehrke, R.G.Helmer

Half-Lives of 134La and 132-135Ce

RADIOACTIVITY 134La, 132,133,134,135Ce; measured T1/2.

doi: 10.1016/0022-1902(76)80440-X
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1976GE14      Phys.Rev. C14, 1896 (1976)

R.J.Gehrke, R.G.Helmer, C.W.Reich, R.C.Greenwood, R.A.Anderl

Level Structure of 131Cs and the Decay Energy of 131Ba

RADIOACTIVITY 131Ba; measured Eγ, Iγ, γγ-coin; deduced Q, log ft. 131Cs deduced levels, γ-branching. Isotope separation, Ge(Li) detectors.

doi: 10.1103/PhysRevC.14.1896
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1976GR09      Nucl.Phys. A270, 29 (1976)

R.C.Greenwood, R.J.Gehrke, R.G.Helmer, C.W.Reich

Gamma-Ray Emission from 134Ce and Levels in 134La

RADIOACTIVITY 134Ce [from Pr, (p, spallation)]; measured Eγ, Iγ, T1/2, γγ-coin; deduced Q(EC), log ft, J, π. 134La deduced levels, J, π. Ge(Li), Si(Li) detectors, isotope separation, chemical separation.

doi: 10.1016/0375-9474(76)90125-1
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1976GR11      Phys.Rev. C14, 1906 (1976)

R.C.Greenwood, C.W.Reich, R.G.Helmer, R.J.Gehrke, R.A.Anderl

134Ba Level Scheme as Observed in the Decay of 134La

RADIOACTIVITY 134La [from Pr(p, X)]; measured Eγ, Iγ, γγ-coin; deduced log ft, ICC. 134Cs; measured Eγ. 134Ba deduced levels, J, π, λ. Ge(Li), Si(Li) detectors.

doi: 10.1103/PhysRevC.14.1906
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1976HE04      Nucl.Phys. A258, 83 (1976)

R.G.Helmer, R.J.Gehrke, R.C.Greenwood, C.W.Reich, L.D.McIsaac

Decay of 128Ba

RADIOACTIVITY 128Ba [from Pr (p, spallation)]; measured Eγ, Iγ, γγ-coin; deduced log ft. 128Cs deduced levels, J, π. Ge(Li), Si(Li) detectors, isotope separation.

doi: 10.1016/0375-9474(76)90529-7
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1976HE18      Nucl.Phys. A272, 269 (1976)

R.G.Helmer

The K-Conversion Coefficients of γ-Rays Above 800 keV from 182Ta Decay

RADIOACTIVITY 182Ta [from Ta(n, γ)]; measured Iγ, I(ce). 182W transitions deduced α(K), λ, mixing ratios. πsquare root2 magnetic spectrometer, Ge(Li) detectors.

doi: 10.1016/0375-9474(76)90331-6
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1975DU01      Nucl.Technol. 25, 294 (1975)

N.D.Dudey, R.J.Popek, R.C.Greenwood, R.G.Helmer, J.W.Rogers, L.S.Kellogg, W.H.Zimmer

Fission-Product-Rate Measurements and Yields

NUCLEAR REACTIONS 238,235U, 239Pu, 237Np(n, F); measured fission product reaction rates, yields.

doi: 10.13182/NT75-A24370
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Data from this article have been entered in the EXFOR database. For more information, access X4 dataset13337.


1975GR08      Nucl.Technol. 25, 274 (1975)

R.C.Greenwood, R.G.Helmer, J.W.Rogers, N.D.Dudey, R.J.Popek, L.S.Kellogg, W.H.Zimmer

Nonfission Reaction Rate Measurements

NUCLEAR REACTIONS 27Al, 197Au, 115In, 63Cu, 59Co, 58Ni, 54Fe, 46,48Ti, 45Sc, 235,238U(n, X); measured reaction rates.

doi: 10.13182/NT75-A24368
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1975HE03      Nucl.Technol. 25, 258 (1975)

R.G.Helmer, R.C.Greenwood

Evaluated Decay Scheme Data

RADIOACTIVITY 24Na, 27Mg, 46,47,48Sc, 54Mn, 58,60Co, 59Fe, 64Cu, 115m,116mIn, 198Au, 239Np, 95Zr, 103Ru, 132Te, 137Cs, 140Ba, 140La, 144Ce, 144Pr; analyzed evaluations, data; evaluated T1/2, Eγ, Iγ.

doi: 10.13182/NT75-A24367
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1974GR37      Nucl.Instrum.Methods 121, 385 (1974)

R.C.Greenwood, R.G.Helmer

Gamma-Ray Energies from 14N(n, γ)15N and 23Na(n, γ)24Na Reactions: A Re-Evaluation

NUCLEAR REACTIONS 14N, 23Na(n, γ); analyzed data. 15N, 24Na deduced levels. 15N deduced neutron binding energy.

doi: 10.1016/0029-554X(74)90090-1
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1974MC08      Nucl.Phys. A223, 29 (1974)

D.J.McMillan, R.C.Greenwood, C.W.Reich, R.G.Helmer

Level Structure of 184W from the Decay of 184gRe and 184mRe

RADIOACTIVITY 184gRe, 184mRe [from 184W(p, n), 186W(p, 3n)]; measured Eγ, Iγ, I(ce), γγ-coin; deduced ICC, log ft. 184W deduced levels, J, π, ICC, B(λ), Q0. Ge(Li), Si(Li) detectors, magnetic electron spectrometer. Enriched, natural targets, chemically purified sources.

doi: 10.1016/0375-9474(74)90277-2
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1973HE19      Nucl.Phys. A211, 1 (1973)

R.G.Helmer, C.W.Reich

Half-Life of 178m2Hf and its Neutron Capture Production

RADIOACTIVITY 178mHf [from 177Hf(n, γ)]; measured T1/2.

NUCLEAR REACTIONS 177Hf(n, γ), E=reactor spectrum; measured σ for production of 31-y 178mHf.

doi: 10.1016/0375-9474(73)90760-4
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Data from this article have been entered in the EXFOR database. For more information, access X4 dataset10354.


1972HE25      ANCR-1043 (1972)

R.G.Helmer, M.H.Putnam

Gauss V. A Computer Program for the Analysis of Gamma-Ray Spectra from Ge(Li) Spectrometers


1971HE13      Nucl.Phys. A168, 449 (1971)

R.G.Helmer, R.C.Greenwood, C.W.Reich

Level Structure of 182Ta

RADIOACTIVITY 182Hf[from 180Hf(2n, γ)], 182mTa[from 181Ta(n, γ)]; measured Eγ, Iγ, γγcoin. 182Ta levels deduced J, π. Enriched 180Hf target, isotope separated 182Hf. 181Ta(n, γ), E=thermal, 2 keV; measured Eγ, Iγ. 182Ta deduced levels, J, π.

doi: 10.1016/0375-9474(71)90541-0
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1971HE20      Nucl.Instrum.Methods 96, 173 (1971)

R.G.Helmer, R.C.Greenwood, R.J.Gehrke

Precise Comparison and Measurement of Gamma-Ray Energies with a Ge(Li) Detector II. 400-1300 keV

RADIOACTIVITY 22Na, 56,58,60Co, 182Ta, 65Zn, 59Fe, 88Y, 46Sc, 160Tb, 54Mn, 95Zr, 94,95Nb, 137Cs, 110mAg, 185Os, 208Tl, 95mTc, 207Bi, 85Sr, 7Be, 192Ir, 198Au, 203Pb; measured Eγ.

doi: 10.1016/0029-554X(71)90452-6
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1971RE13      Nucl.Phys. A168, 487 (1971)

C.W.Reich, R.G.Helmer, R.C.Greenwood

Coriolis coupling in doubly odd deformed nuclei: The 1/2-[510] and 3/2-[512] neutron states in 182Ta

NUCLEAR STRUCTURE 182Ta; calculated levels, transition probabilities, 181Ta(d, p) σ. Coriolis coupling model.

doi: 10.1016/0375-9474(71)90542-2
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1970GR13      Nucl.Instrum.Methods 77, 141 (1970)

R.C.Greenwood, R.G.Helmer, R.J.Gehrke

Precise Comparison and Measurement of Gamma-Ray Energies with a Ge(Li) Detector I. 50-420 keV

RADIOACTIVITY 57Co, 75Se, 109Cd, 113Sn, 133Ba, 139,141Ce, 153Gd, 182Ta, 199Au, 192Ir, 203Hg; measured Eγ. Ge(Li) detector.

doi: 10.1016/0029-554X(70)90592-6
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1969GE02      Phys.Rev. 177, 1792 (1969)

R.J.Gehrke, R.G.Helmer

Decay of 102-Rh and 102m-Rh

RADIOACTIVITY 102Rh; measured Eγ, Iγ, γγ-coin. 102Ru deduced levels, J, π. Ge(Li) detector.

doi: 10.1103/PhysRev.177.1792
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1969MC08      Nucl.Phys. A132, 28 (1969)

L.D.McIsaac, R.G.Helmer, C.W.Reich

Levels in 183Ta from the Decay of 183Hf

RADIOACTIVITY 183Hf[from 182Hf(n, γ)]; measured Eγ, Iγ, γγ- coin, βγ- coin. 183Ta levels deduced J, π. Ge(Li) detector, isotope-separated 182Hf.

doi: 10.1016/0375-9474(69)90610-1
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1968HE10      Nucl.Phys. A114, 649 (1968)

R.G.Helmer, C.W.Reich

Decay of an Isomeric State in 178Hf with K > = 16

RADIOACTIVITY 178mHf [from 177Hf(n, γ)]; measured T1/2, Eγ, Iγ, γγ-coin. 178Hf levels deduced J, π. Ge(Li) detector, isotope-separated nuclei.

doi: 10.1016/0375-9474(68)90294-7
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1968HE19      Nucl.Instr.Methods 65, 31 (1968)

R.G.Helmer, A.Backlin

Numerical Construction of Level Schemes - 149Pm

RADIOACTIVITY 149Nd; measured Eγ. 149Pm deduced levels.

doi: 10.1016/0029-554X(68)90005-0
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1967HE14      Bull.Am.Phys.Soc. 12, No.8, 1199, FB3 (1967)

R.G.Helmer, R.C.Greenwood

Levels in 182Ta

NUCLEAR STRUCTURE 182Ta; measured not abstracted; deduced nuclear properties.


1967HE20      Nucl.Instr.Methods 47, 305 (1967)

R.G.Helmer, R.L.Heath, L.A.Schmittroth, G.A.Jayne, L.M.Wagner

Analysis of Gamma-Ray Spectra from NaI(Tl) and Ge(Li) Spectrometers. Computer Programs

RADIOACTIVITY 199Pt, 149Nd; analyzed γ-spectra; deduced Iγ.

doi: 10.1016/0029-554X(67)90445-4
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1967HE21      Nucl.Instr.Methods 47, 281 (1967)

R.L.Heath, R.G.Helmer, L.A.Schmittroth, G.A.Cazier

A Method for Generating Single Gamma-Ray Shapes for the Analysis of Spectra

RADIOACTIVITY 94Nb, 46Sc, 88Y, 48V; analyzed γ spectra; deduced Iγ.

doi: 10.1016/0029-554X(67)90444-2
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1967HE22      Nucl.Instr.Methods 57, 46 (1967)

R.G.Helmer, R.L.Heath, M.Putnam, D.H.Gipson

Photopeak Analysis Program for Photon Energy and Intensity Determinations. Ge(Li) and NaI(Tl) Spectrometers

RADIOACTIVITY 22Na, 60Co, 137Cs, 182Ta, 198Au, 207Bi; analyzed γ-spectra; deduced Eγ. Photopeak analysis.

doi: 10.1016/0029-554X(67)90496-X
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1967MU08      Phys.Rev. 155, 1263 (1967)

E.L.Murri, L.D.McIsaac, R.G.Helmer

Decay of In115m

NUCLEAR STRUCTURE 115In; measured not abstracted; deduced nuclear properties.

doi: 10.1103/PhysRev.155.1263
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1967OT03      Phys.Rev. 164, 1485 (1967)

O.H.Otteson, R.G.Helmer

Decay of 172Tm

NUCLEAR STRUCTURE 172Tm; measured not abstracted; deduced nuclear properties.

doi: 10.1103/PhysRev.164.1485
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1966HE04      Phys.Rev. 143, 923 (1966)

R.G.Helmer, L.D.McIsaac

Decay of Nd149

NUCLEAR STRUCTURE 149Nd; measured not abstracted; deduced nuclear properties.

doi: 10.1103/PhysRev.143.923
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1966MC11      Phys.Rev. 150, 1033 (1966)

L.D.McIsaac, R.G.Helmer

Levels in 149Sm from the Decay of 149Eu and 149Pm

NUCLEAR STRUCTURE 149Pm, 149Eu; measured not abstracted; deduced nuclear properties.

doi: 10.1103/PhysRev.150.1033
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1965CL06      IDO-17140, p.51 (1965)

J.E.Cline, R.G.Helmer

Transitions Observed in the Decay of 54-Day Eu-148

NUCLEAR STRUCTURE 148Eu; measured not abstracted; deduced nuclear properties.


1965HE04      Phys.Rev. 137, B223 (1965)

R.G.Helmer, L.D.McIsaac

Level Structure in Au197 from the Decay of Hg197m, Hg197, and Pt197

NUCLEAR STRUCTURE 197Hg, 197Pt; measured not abstracted; deduced nuclear properties.

doi: 10.1103/PhysRev.137.B223
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1965HE05      Phys.Rev. 137, B232 (1965)

R.G.Helmer

Decay of Os194

NUCLEAR STRUCTURE 194Os; measured not abstracted; deduced nuclear properties.

doi: 10.1103/PhysRev.137.B232
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1965HE11      Bull.Am.Phys.Soc. 10, 442 BB11 (1965);Priv.Comm. (1965)

R.G.Helmer, L.D.McIsaac

Decay of Nd149


1964BU10      Phys.Rev. 136, B1 (1964)

S.B.Burson, E.B.Shera, T.Gedayloo, R.G.Helmer, D.Zei

Levels in Re188 from Studies of the Decay of W188 (69.4 d), Re188 (18 h), and Re188m (18.5 m)

NUCLEAR STRUCTURE 188Re, 188W; measured not abstracted; deduced nuclear properties.

doi: 10.1103/PhysRev.136.B1
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