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NSR database version of April 26, 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 T_1/2. 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, ^{138,139,140,141}Cs, ^{141,142,145,143,144}Ba, ^{142,143,144,145}La, ^{145,146,147,148}Ce, ^146,147,148Pr, ^{154,155,149,151,152,153}Nd, ^{152,153,154,155,156,157}Pm, ^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
Citations: PlumX Metrics

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^-); ^{138,139,140,141}Cs(β^-); measured γγ-coin, sum spectra. ^{138,139,140,141}Cs 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
Citations: PlumX Metrics

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, ^{238,239,240,241}Pu, 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
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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
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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 T_1/2. 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
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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
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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
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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
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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
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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
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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
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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
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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
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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, T_1/2. 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, ^{132,133,134,135}Ce; measured T_1/2.

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, T_1/2, 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 T_1/2, 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 T_1/2.

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 T_1/2, 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 In^115m

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 Hg^197m, 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 Re^188m (18.5 m)

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

doi: 10.1103/PhysRev.136.B1
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