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Search: Author = R.L.Helmer

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2002TA22      Nucl.Instrum.Methods Phys.Res. A489, 178 (2002)

N.J.Tagg, A.S.Hamer, B.Sur, E.D.Earle, R.L.Helmer, G.Jonkmans, B.A.Moffat, J.J.Simpson

The 8Li Calibration Source for the Sudbury Neutrino Observatory

RADIOACTIVITY 8Li(β-) [from 11B(n, α)]; measured Eβ, βα-coin. Use as calibration source in neutrino observatory discussed.

doi: 10.1016/S0168-9002(02)00860-4
Citations: PlumX Metrics


2001PA45      Phys.Rev. C64, 064611 (2001)

M.M.Pavan, J.T.Brack, F.Duncan, A.Feltham, G.Jones, J.Lange, K.J.Raywood, M.E.Sevior, R.Adams, D.F.Ottewell, G.R.Smith, B.Wells, R.L.Helmer, E.L.Mathie, R.Tacik, R.A.Ristinen, I.I.Strakovsky, H.-M.Staudenmaier

Precision Pion-Proton Elastic Differential Cross Sections at Energies Spanning the Δ Resonance

NUCLEAR REACTIONS 1H(π+, π+), (π-, π-), E=141.15-267.3 MeV; measured σ(θ), (pion)(proton)-coin. Comparison with model predictions.

doi: 10.1103/PhysRevC.64.064611
Citations: PlumX Metrics


1998LO12      Phys.Rev. C57, 3191 (1998)

S.A.Long, B.M.Spicer, K.J.Raywood, R.Abegg, W.P.Alford, A.Celler, D.Frekers, P.E.Green, O.Hausser, R.L.Helmer, R.S.Henderson, K.H.Hicks, K.P.Jackson, R.G.Jeppesen, N.S.P.King, C.A.Miller, M.A.Moinester, V.C.Officer, G.G.Shute, A.Trudel, M.C.Vetterli, A.I.Yavin, S.Yen

Spin-Isovector Giant Resonances Induced by (n, p) Reactions on Heavy Nuclei

NUCLEAR REACTIONS 120Sn, 181Ta(n, p), E=298 MeV; 238U(n, p), E=318 MeV; measured σ(Ep, θ). 90Zr, 208Pb(n, p), E=198 MeV; analyzed σ(Ep, θ). 90Y, 120In, 181Hf, 208Tl, 238Pa deduced L=0, 1, 2, 3 giant resonances energy distributions, quasi-free contributions, comparison with sum rules for L=1, 3. Multipole decomposition procedure.

doi: 10.1103/PhysRevC.57.3191
Citations: PlumX Metrics

Data from this article have been entered in the EXFOR database. For more information, access X4 dataset13970.


1997HE06      Phys.Rev. C55, 2802 (1997)

R.L.Helmer, M.A.Punyasena, R.Abegg, W.P.Alford, A.Celler, S.El-Kateb, J.Engel, D.Frekers, R.S.Henderson, K.P.Jackson, S.Long, C.A.Miller, W.C.Olsen, B.M.Spicer, A.Trudel, M.C.Vetterli

Gamow-Teller Strength from the 76Se(n, p)76As Reaction: Implications for the double β decay of 76Ge

NUCLEAR REACTIONS 76Se(n, p), E=198 MeV; measured σ(θ). 76As deduced Gamow-Teller strength distribution. 76Ge deduced 2ν-accompanied 2β-decay T1/2. Quasi-particle RPA comparison, other data analyzed.

doi: 10.1103/PhysRevC.55.2802
Citations: PlumX Metrics

Data from this article have been entered in the EXFOR database. For more information, access X4 dataset13975.


1991HA01      Phys.Rev. C43, 230 (1991)

O.Hausser, M.C.Vetterli, R.W.Fergerson, C.Glashausser, R.C.Jeppesen, R.D.Smith, R.Abegg, F.T.Baker, A.Celler, R.L.Helmer, R.Henderson, K.Hicks, M.J.Iqbal, K.P.Jackson, K.W.Jones, J.Lisantti, J.Mildenberger, C.A.Miller, R.S.Sawafta, S.Yen

Nuclear Response in the 54Fe(p(pol), p(pol)') Reaction at 290 MeV

NUCLEAR REACTIONS 54Fe(polarized p, p'), E=290 MeV; measured σ(θ), spin observables, analyzing power, spin-flip probabilities. 54Fe(n, p), E=298 MeV; analyzed data. 54Fe deduced isovector giant dipole, isoscalar giant quadrupole resonance. 54Mn deduced Gamow-Teller transition strength, quenching. Surface RPA model.

doi: 10.1103/PhysRevC.43.230
Citations: PlumX Metrics

Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC1606.


1990AL19      Nucl.Phys. A514, 49 (1990)

W.P.Alford, R.L.Helmer, R.Abegg, A.Celler, D.Frekers, P.Green, O.Hausser, R.Henderson, K.Hicks, K.P.Jackson, R.Jeppesen, C.A.Miller, A.Trudel, M.Vetterli, S.Yen, R.Pourang, J.Watson, B.A.Brown, J.Engel

Gamow-Teller Strength Observed in the 48Ti(n, p)48Sc Reaction: Implications for the double beta decay of 48Ca

NUCLEAR REACTIONS 48Ti(n, p), E=198 MeV; measured σ(θ). 48Sc deduced Gamow-Teller strength distribution. Shell model comparison.

doi: 10.1016/0375-9474(90)90331-F
Citations: PlumX Metrics

Data from this article have been entered in the EXFOR database. For more information, access X4 dataset14007.


1990KO17      Phys.Rev. C41, 2571 (1990)

R.G.Korteling, R.E.L.Green, J.M.D'Auria, R.L.Helmer, K.P.Jackson, S.B.Kaufman, B.D.Wilkins

Light Fragment Emission as Studied by the (p, pHe) Reactions on Be and Ag with 300 MeV Protons

NUCLEAR REACTIONS Be, Ag(p, pX), E=300 MeV; measured σ(Ep, θ), σ(E, fragment θ) for X=p, 3,4He; deduced differential mean multiplicities, invariant σ, rapidities.

doi: 10.1103/PhysRevC.41.2571
Citations: PlumX Metrics


1990RA13      Phys.Rev. C41, 2836 (1990)

K.J.Raywood, B.M.Spicer, S.Yen, S.A.Long, M.A.Moinester, R.Abegg, W.P.Alford, A.Celler, T.E.Drake, D.Frekers, P.E.Green, O.Hausser, R.L.Helmer, R.S.Henderson, K.H.Hicks, K.P.Jackson, R.G.Jeppesen, J.D.King, N.S.P.King, C.A.Miller, V.C.Officer, R.Schubank, G.G.Shute, M.Vetterli, J.Watson, A.I.Yavin

Spin-Flip Isovector Giant Resonances from the 90Zr(n, p)90Y Reaction at 198 MeV

NUCLEAR REACTIONS 90Zr(n, p), E=198 MeV; measured σ(Ep, θ); deduced σ(θ). 90Y deduced spin isovector dipole transition strengths.

doi: 10.1103/PhysRevC.41.2836
Citations: PlumX Metrics

Data from this article have been entered in the EXFOR database. For more information, access X4 dataset13517.


1989CE02      Phys.Lett. 227B, 336 (1989)

D.A.Cebra, W.Benenson, Y.Chen, E.Kashy, A.Pradhan, A.Vander Molen, G.D.Westfall, W.K.Wilson, D.J.Morrissey, R.S.Tickle, R.Korteling, R.L.Helmer

Two-Particle Correlations from 500 MeV p + Ag and Be

NUCLEAR REACTIONS Ag, Be(p, 2pX), (p, 2dX), (p, dαX), (p, pdX), (p, pαX), (p, 2tX), E=500 MeV; measured light (particle)(particle)-correlations; deduced reaction mechanism.

doi: 10.1016/0370-2693(89)90940-4
Citations: PlumX Metrics


1989HI10      Phys.Rev. C40, R2445 (1989)

K.H.Hicks, M.C.Vetterli, A.Celler, R.L.Helmer, R.S.Henderson, K.P.Jackson, R.G.Jeppesen, A.Trudel, S.Yen

Quasifree Analyzing Powers using the (p(pol), n) Reaction

NUCLEAR REACTIONS 12C, 54Fe(polarized p, n), E=290, 420 MeV; measured σ(θn, En), analyzing power. Relativistic, nonrelativistic model analysis.

doi: 10.1103/PhysRevC.40.R2445
Citations: PlumX Metrics

Data from this article have been entered in the EXFOR database. For more information, access X4 datasetO0110.


1989MO19      Phys.Lett. 230B, 41 (1989)

M.A.Moinester, A.Trudel, K.Raywood, S.Yen, B.M.Spicer, R.Abegg, W.P.Alford, N.Auerbach, A.Celler, D.Frekers, O.Hausser, R.L.Helmer, R.Henderson, K.H.Hicks, K.P.Jackson, R.G.Jeppesen, N.S.P.King, S.Long, C.A.Miller, M.Vetterli, J.Watson, A.I.Yavin

A Study of Spin Isovector Giant Resonances with the 208Pb(n, p)208Tl Reaction

NUCLEAR REACTIONS 208Pb(n, p), E=198, 458 MeV; measured σ(θp, Ep). 208Tl deduced spin isovector giant resonances.

doi: 10.1016/0370-2693(89)91650-X
Citations: PlumX Metrics

Data from this article have been entered in the EXFOR database. For more information, access X4 dataset13977.


1988HA09      Phys.Rev. C37, 1119 (1988)

O.Hausser, R.Sawafta, R.G.Jeppesen, R.Abegg, W.P.Alford, R.L.Helmer, R.Henderson, K.Hicks, K.P.Jackson, J.Lisantti, C.A.Miller, M.C.Vetterli, S.Yen

Energy Dependence of Isovector and Isoscalar 1+ Excitations in 28Si(p, p') between 200 and 400 MeV

NUCLEAR REACTIONS 28Si(p, p'), E=200-400 MeV; measured σ(θ). 28Si deduced isovector 1+ transition strengths, summed Gamow-Teller strengths.

doi: 10.1103/PhysRevC.37.1119
Citations: PlumX Metrics

Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC1422.


1988HA27      Phys.Rev.Lett. 61, 822 (1988)

O.Hausser, R.Abegg, R.G.Jeppesen, R.Sawafta, A.Celler, A.Green, R.L.Helmer, R.Henderson, K.Hicks, K.P.Jackson, J.Mildenberger, C.A.Miller, M.C.Vetterli, S.Yen, M.J.Iqbal, R.D.Smith

Complete Spin Observables for Quasielastic Proton Scattering from 54Fe at 290 MeV

NUCLEAR REACTIONS 54Fe(polarized p, p'X), E=290 MeV; measured σ(θ, Ep'), spin-transfer σ(θ, Ep'), analyzing power, spin observables; deduced Fermi motion, nuclear response function, nucleon-nucleon interaction role. Relativistic, non-relativistic models, impulse approximation.

doi: 10.1103/PhysRevLett.61.822
Citations: PlumX Metrics


1988HI03      Phys.Lett. 201B, 29 (1988)

K.H.Hicks, O.Hausser, R.Abegg, W.P.Alford, A.Celler, R.L.Helmer, R.S.Henderson, K.P.Jackson, J.Lisantti, C.A.Miller, R.Sawafta, J.R.Shepard, S.Yen

P-A(y) for Excitation of Natural- and Unnatural-Parity States of 12C by 400 MeV Protons

NUCLEAR REACTIONS 12C(p, p'), E=400 MeV; measured polarization, analyzing power differences. Nonrelativistic, relativistic model calculations.

doi: 10.1016/0370-2693(88)90074-3
Citations: PlumX Metrics


1988JA01      Phys.Lett. 201B, 25 (1988)

K.P.Jackson, A.Celler, W.P.Alford, K.Raywood, R.Abegg, R.E.Azuma, C.K.Campbell, S.El-Kateb, D.Frekers, P.W.Green, O.Hausser, R.L.Helmer, R.S.Henderson, K.H.Hicks, R.Jeppesen, P.Lewis, C.A.Miller, A.Moalem, M.A.Moinester, R.B.Schubank, G.G.Shute, B.M.Spicer, M.C.Vetterli, A.I.Yavin, S.Yen

The (n, p) Reaction as a Probe of Gamow-Teller Strength

NUCLEAR REACTIONS 6Li, 12,13C(n, p), E=198 MeV; measured σ(θ), σ(θp).

doi: 10.1016/0370-2693(88)90073-1
Citations: PlumX Metrics

Data from this article have been entered in the EXFOR database. For more information, access X4 dataset13150.


1988YE01      Phys.Lett. 206B, 597 (1988)

S.Yen, B.M.Spicer, M.A.Moinester, K.Raywood, R.Abegg, W.P.Alford, A.Celler, T.E.Drake, D.Frekers, O.Hausser, R.L.Helmer, R.S.Henderson, K.H.Hicks, K.P.Jackson, R.Jeppesen, J.D.King, N.S.P.King, K.Lin, S.Long, C.A.Miller, V.C.Officer, R.Schubank, G.G.Shute, M.C.Vetterli, A.I.Yavin

Gamow-Teller Strength and Giant Resonances in 90Zr(n, p) at 198 MeV

NUCLEAR REACTIONS 90Zr(n, p), E=198 MeV; measured σ(θp, Ep). 90Y deduced giant resonances, Gamow-Teller Strength.

doi: 10.1016/0370-2693(88)90703-4
Citations: PlumX Metrics


1987FR05      Phys.Rev. C35, 2236 (1987)

D.Frekers, S.S.M.Wong, R.E.Azuma, T.E.Drake, J.D.King, R.Abegg, K.P.Jackson, C.A.Miller, S.Yen, W.P.Alford, R.L.Helmer, C.Broude, S.Mattsson, E.Rost

Elastic and Inelastic Scattering of 362 MeV polarized Protons from 40Ca

NUCLEAR REACTIONS 40Ca(polarized p, p), (polarized p, p'), E=362 MeV; measured σ(θ), analyzing power. Magnetic spectrometer. Model calculations.

doi: 10.1103/PhysRevC.35.2236
Citations: PlumX Metrics

Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC0840.


1987GR11      Phys.Rev. C35, 1341 (1987)

R.E.L.Green, R.G.Korteling, J.M.D'Auria, K.P.Jackson, R.L.Helmer

Light Fragment Spectra to Upper Kinematic Limits for 300 MeV Proton Reactions with Be and Ag

NUCLEAR REACTIONS 9Be, Ag(p, X), E=190, 300 MeV; measured σ(fragment θ, E) for X=2,1H, 3,4He, 6He, 6,7Li, 7Be; deduced slope parameters, source velocities, statistical model limits. Rapidity analysis.

doi: 10.1103/PhysRevC.35.1341
Citations: PlumX Metrics

Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC0763.


1987HA11      Phys.Lett. 184B, 316 (1987)

O.Hausser, K.Hicks, C.W.Glover, R.Abegg, A.Celler, C.Gunther, R.L.Helmer, R.Henderson, D.J.Horen, C.J.Horowitz, K.P.Jackson, J.Lisantti, D.K.McDaniels, C.A.Miller, R.Sawafta, L.W.Swenson

Spin Observables for 208Pb(p(pol), p(pol)) Elastic Scattering at 290 MeV

NUCLEAR REACTIONS 208Pb(polarized p, p), E=290 MeV; measured polarizations, transfer coefficients vs momentum transfer; deduced elastic scattering amplitudes, spin rotation parameters. Focal-plane polarimeter. Dirac calculations.

doi: 10.1016/0370-2693(87)90172-9
Citations: PlumX Metrics


1987HE24      Nucl.Instrum.Methods Phys.Res. A257, 97 (1987)

R.S.Henderson, W.P.Alford, D.Frekers, O.Hausser, R.L.Helmer, K.H.Hicks, K.P.Jackson, C.A.Miller, M.C.Vetterli, S.Yen

A Segmented Target Chamber for (n, p) Studies at TRIUMF

NUCLEAR REACTIONS 7Li, 12C(n, p), E=198 MeV; measured σ(Ep), σ(θp). Segmented target chamber.

doi: 10.1016/0168-9002(87)90728-5
Citations: PlumX Metrics


1987MO04      Phys.Lett. 183B, 269 (1987)

A.Moalem, D.Frekers, S.A.Gurvitz, R.Abegg, C.Davis, K.P.Jackson, C.A.Miller, R.S.Henderson, S.Yen, R.L.Helmer, K.H.Hicks, J.S.Wesick

Inclusive Analyzing Power and Scattering Mechanisms in Proton-Nucleus Scattering at Backward Angles

NUCLEAR REACTIONS 9Be, C(polarized p, p'), E=303 MeV; measured analyzing power (θ=120°); deduced scattering mechanism. ΔE-E telescopes.

doi: 10.1016/0370-2693(87)90961-0
Citations: PlumX Metrics


1986AL18      Phys.Lett. 179B, 20 (1986)

W.P.Alford, R.L.Helmer, R.Abegg, A.Celler, O.Hausser, K.Hicks, K.P.Jackson, C.A.Miller, S.Yen, R.E.Azuma, D.Frekers, R.S.Henderson, H.Baer, C.D.Zafiratos

Ratio of the Isovector Effective Interaction Strengths (J(στ)/J(τ))2 between 200 and 450 MeV from the 14C(p, n)14N Reaction

NUCLEAR REACTIONS 14C(p, n), E=200, 300, 400, 450 MeV; measured σ(θ); deduced ratios of distortion factors, isovector effective interaction strengths. 14N levels deduced Gamow-Teller, Fermi transition σ ratio. DWIA.

doi: 10.1016/0370-2693(86)90428-4
Citations: PlumX Metrics

Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC0807.


1986KH01      Can.J.Phys. 64, 219 (1986)

M.Khaliquzzaman, W.K.Dawson, H.W.Fielding, P.W.Green, R.L.Helmer, W.J.McDonald, G.C.Neilson, B.C.Robertson, D.M.Sheppard

Energy Levels, Decay Scheme, Gamma-Ray Branching Ratios, and Lifetimes in 49V with (p, nγ) Reaction

NUCLEAR REACTIONS 49Ti(p, nγ), E=5.74 MeV; measured Eγ, Iγ, γ(t). 49V deduced levels, γ-branching, J, π, T1/2.

doi: 10.1139/p86-040
Citations: PlumX Metrics


1985LA13      Phys.Rev. C32, 76 (1985)

S.T.Lam, W.K.Dawson, S.A.Elbakr, H.W.Fielding, P.W.Green, R.L.Helmer, I.J.van Heerden, A.H.Hussein, S.P.Kwan, G.C.Neilson, T.Otsubo, D.M.Sheppard, H.S.Sherif, J.Soukup

Elastic Scattering of Polarized Neutrons on 16O, 59Co, and Pb at 23 MeV

NUCLEAR REACTIONS 16O, 59Co, Pb(polarized n, n), E=23 MeV; measured σ(θ), A(θ). Optical model potential analysis.

doi: 10.1103/PhysRevC.32.76
Citations: PlumX Metrics

Data from this article have been entered in the EXFOR database. For more information, access X4 dataset12962.


1984HE03      Phys.Rev. C29, 676 (1984)

R.L.Helmer, R.E.L.Green, K.P.Jackson, R.G.Korteling

Wide Angle Deuteron Emission in the 9Be(p, pd) Reaction at 300 MeV Mimics (p, 2p) Systematics

NUCLEAR REACTIONS 9Be(p, pd), E=300 MeV; measured inclusive integrated σ(θp, Ep), pd(θ); deduced differential multiplicities < Mp >.

doi: 10.1103/PhysRevC.29.676
Citations: PlumX Metrics


1984KH04      Nucl.Phys. A424, 191 (1984)

M.Khaliquzzaman, W.K.Dawson, H.W.Fielding, P.W.Green, R.L.Helmer, W.J.McDonald, G.C.Neilson, B.C.Robertson, D.M.Sheppard

Energy Levels, Decay Scheme, γ-Ray Branching Ratios and Lifetimes in 55Fe from the 55Mn(p, nγ)55Fe Reaction

NUCLEAR REACTIONS 55Mn(p, nγ), E=4, 6 MeV; measured Eγ, Iγ, γ-time distribution. 55Fe deduced levels, decay scheme, γ-branching, T1/2. Natural targets.

doi: 10.1016/0375-9474(84)90181-7
Citations: PlumX Metrics


1983GR21      Nucl.Phys. A405, 463 (1983)

R.E.L.Green, D.H.Boal, R.L.Helmer, K.P.Jackson, R.G.Korteling

Large-Angle Proton Emission in the 9Be(p, 2p) Reaction at 300 MeV

NUCLEAR REACTIONS Be(p, pX), (p, 2pX), E=300 MeV; measured σ(E(p), θ(p)), σ(E1, θ1, E2, θ2=90°), pp-coin. Comparison with phase-space, direct knockout calculations.

doi: 10.1016/0375-9474(83)90515-8
Citations: PlumX Metrics


1980HE04      Nucl.Phys. A336, 219 (1980)

R.L.Helmer, M.D.Hasinoff, J.E.Bussoletti, K.A.Snover, T.A.Trainor

Investigation of the Electric Quadrupole Strength in 13N Using the 12C(p, γ0)13N Reaction

NUCLEAR REACTIONS 12C(polarized p, γ), E=10-17 MeV; measured σ(Ep, θγ), asymmetry. 13N deduced E1, E2 σ. Enriched target.

doi: 10.1016/0375-9474(80)90621-1
Citations: PlumX Metrics


1970BA68      Can.J.Phys. 48, 3059 (1970)

G.M.Bailey, G.M.Griffiths, M.A.Olivo, R.L.Helmer

Gamma-Ray Yields from the Reaction D(p, γ)3He at Low Energies

NUCLEAR REACTIONS 2H(p, γ), E=0.6-1.2 MeV; measured σ(E;Eγ).

doi: 10.1139/p70-379
Citations: PlumX Metrics

Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC1637.


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