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NSR database version of May 19, 2024.

Search: Author = K.Helmer

Found 12 matches.

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1997IB01      Nucl.Phys. A619, 213 (1997)

R.W.Ibbotson, C.A.White, T.Czosnyka, P.A.Butler, N.Clarkson, D.Cline, R.A.Cunningham, M.Devlin, K.G.Helmer, T.H.Hoare, J.R.Hughes, G.D.Jones, A.E.Kavka, B.Kotlinski, R.J.Poynter, P.H.Regan, E.G.Vogt, R.Wadsworth, D.L.Watson, C.Y.Wu

Quadrupole and Octupole Collectivity in 148Nd

NUCLEAR REACTIONS 148Nd(58Ni, 58Ni), E=200 MeV; measured (projectile)(recoil)-coin, (projectile)γ-coin following Coulomb excitation. 148Nd(92Mo, 92Mo'), E=330 MeV; measured (projectile)γ-coin following Coulomb excitation. 208Pb(148Nd, 148Nd'), E=700 MeV; measured Eγ, Iγ, γ multiplicity following Coulomb excitation. 148Nd levels deduced B(λ), shape, collectivity related features.

doi: 10.1016/S0375-9474(97)00145-0
Citations: PlumX Metrics


1995CR01      Phys.Rev. C51, 1025 (1995)

A.J.Cresswell, M.Devlin, P.A.Butler, D.Cline, K.G.Helmer, R.Ibbotson, G.D.Jones, M.A.Stoyer, J.O.Rasmussen, C.Y.Wu

Prompt and Isomeric Fission of Pu Isotopes following Heavy-Ion Induced Transfer Reactions

NUCLEAR REACTIONS 239Pu(117Sn, 118Sn), (117Sn, 117Sn'), E=630 MeV; measured 238Pu isomer fission σ following neutron transfer, 239Pu prompt fission σ following inelastic excitation. 239,238Pu deduced delayed to prompt fission ratio.

doi: 10.1103/PhysRevC.51.1025
Citations: PlumX Metrics


1995WU01      Phys.Rev. C51, 173 (1995)

C.Y.Wu, D.Cline, M.Devlin, K.G.Helmer, R.W.Ibbotson, M.W.Simon, P.A.Butler, A.J.Cresswell, G.D.Jones, P.M.Jones, J.F.Smith, R.A.Cunningham, J.Simpson

Excitation-Energy Partition in Quasielastic Transfer Reactions at Near Barrier Energies

NUCLEAR REACTIONS 161Dy(58Ni, 59Ni), E=265 MeV; 161Dy(61Ni, 62Ni), E=267, 270 MeV; measured (particle)γ-coin; deduced receptor, donor excitation energy partition. 59,62Ni levels deduced relative population.

doi: 10.1103/PhysRevC.51.173
Citations: PlumX Metrics


1994CR06      Acta Phys.Pol. B25, 565 (1994)

A.J.Cresswell, P.A.Butler, D.Cline, R.A.Cunningham, M.Devlin, F.Hannachi, K.G.Helmer, R.Ibbotson, G.D.Jones, P.M.Jones, I.-Y.Lee, X.-T.Liu, J.O.Rasmussen, M.W.Simon, J.Simpson, J.F.Smith, M.A.Stoyer, C.-Y.Wu

Heavy Ion Transfer Studies using Detector Arrays

NUCLEAR REACTIONS, ICPND 161Dy(61Ni, 62Ni), (61Ni, 60Ni), E=270 MeV; measured γγ-coin. 160,162Dy deduced levels, band structure, configuration. 239Pu(117Sn, 118Sn), E=630 MeV; measured fragment spectra following residual isomer fission, γγ-coin; deduced superdeformed states population probability by transfer reaction.


1993DE12      Phys.Rev. C47, 2178 (1993)

M.Devlin, D.Cline, K.G.Helmer, R.Ibbotson, C.Y.Wu, P.A.Butler, A.J.Cresswell, G.D.Jones, M.A.Stoyer, J.O.Rasmussen

Spectroscopy of 238,239Pu Studied by Quasielastic Reactions

NUCLEAR REACTIONS 239Pu(117Sn, 117Sn'), (117Sn, 118Sn), E=630 MeV; measured γγ-coin, γ multiplicity. 238,239Pu deduced levels, J, π, band structure.

doi: 10.1103/PhysRevC.47.2178
Citations: PlumX Metrics


1993HE14      Phys.Rev. C48, 1879 (1993)

K.G.Helmer, C.Y.Wu, D.Cline, A.E.Kavka, W.J.Kernan, E.G.Vogt, M.W.Guidry, X.L.Han, R.W.Kincaid, X.T.Liu, H.Schecter, J.O.Rasmussen, A.Shihab-Eldin, M.A.Stoyer, M.L.Halbert

Search for Diabolical Pair Transfer in Two-Neutron Transfer Reactions

NUCLEAR REACTIONS 206Pb(156Gd, 154Gd), (156Gd, 158Gd), E=888 MeV; measured Eγ, Iγ, γ-ray multiplicity; deduced diabolical pair transfer related features.

doi: 10.1103/PhysRevC.48.1879
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1993IB01      Phys.Rev.Lett. 71, 1990 (1993)

R.Ibbotson, C.A.White, T.Czosnyka, P.A.Butler, N.Clarkson, D.Cline, R.A.Cunningham, M.Devlin, K.G.Helmer, T.H.Hoare, J.R.Hughes, G.D.Jones, A.E.Kavka, B.Kotlinski, R.J.Poynter, P.Regan, E.G.Vogt, R.Wadsworth, D.L.Watson, C.Y.Wu

Octupole Collectivity in the Ground Band of 148Nd

NUCLEAR REACTIONS 148Nd(58Ni, 58Ni'), E=200 MeV; 148Nd(92Mo, 92Mo'), E=330 MeV; measured (particle)γ-, γγ(particle)-coin following Coulomb excitation. 208Pb(148Nd, 148Nd'), E=700 MeV; measured (particle)γ-coin, γ yields, γ-multiplicity following Coulomb excitation. 148Nd deduced levels, γ-multipolarity, multipole matrix elements, band collectivity features.

doi: 10.1103/PhysRevLett.71.1990
Citations: PlumX Metrics


1991HE19      Phys.Rev. C44, 2598 (1991)

K.G.Helmer, C.Y.Wu, D.Cline, M.A.Deleplanque, R.M.Diamond, A.E.Kavka, W.J.Kernan, X.T.Liu, A.O.Macchiavelli, R.J.McDonald, J.O.Rasmussen, F.S.Stephens, M.A.Stoyer, E.G.Vogt

Population of High-Spin States in 234U by Heavy-Ion-Induced Transfer Reactions

NUCLEAR REACTIONS 235U(58Ni, 59Ni), E=325 MeV; 235U(206Pb, 207Pb), E=1394 MeV; measured Eγ, Iγ, (particle)γγ-coin; deduced one-nucleon transfer σ. Q(gg) systematics model comparison.

doi: 10.1103/PhysRevC.44.2598
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1991IB01      Nucl.Phys. A530, 199 (1991)

R.Ibbotson, B.Kotlinski, D.Cline, K.G.Helmer, A.E.Kavka, A.Renalds, E.G.Vogt, P.A.Butler, C.A.White, R.Wadsworth, D.L.Watson

Lifetimes of Low-Lying States in 148Nd

NUCLEAR REACTIONS 148Nd(58Ni, 58Ni'), E=220 MeV; measured Eγ, Iγ, recoil distance decay curves following Coulomb excitation, pγ-coin. 148Nd levels deduced T1/2, B(λ), intrinsic deformations, quadrupole moments.

doi: 10.1016/0375-9474(91)90763-V
Citations: PlumX Metrics


1991WU05      Nucl.Phys. A533, 359 (1991)

C.Y.Wu, D.Cline, E.G.Vogt, W.J.Kernan, T.Czosnyka, K.G.Helmer, R.W.Ibbotson, A.E.Kavka, B.Kotlinski, R.M.Diamond

Electromagnetic Properties of Tungsten Nuclei

NUCLEAR REACTIONS 182,184W(58Ni, 58Ni'), E=235 MeV; 182,184W(136Xe, 136Xe'), E=561 MeV; measured Eγ, Iγ following Coulomb excitation. 182,184W(58Ni, 58Ni'), E=245 MeV; measured Eγ, Iγ, recoil distance method. 182,184W deduced levels, static, transition E2 matrix elements, T1/2.

doi: 10.1016/0375-9474(91)90495-R
Citations: PlumX Metrics


1990KO30      Nucl.Phys. A517, 365 (1990)

B.Kotlinski, D.Cline, A.Backlin, K.G.Helmer, A.E.Kavka, W.J.Kernan, E.G.Vogt, C.Y.Wu, R.M.Diamond, A.O.Macchiavelli, M.A.Deleplanque

Coulomb Excitation of 168Er

NUCLEAR REACTIONS 168Er(208Pb, 208Pb'), E=950 MeV; 168Er(58Ni, 58Ni'), E=220 MeV; 168Er(40Ca, 40Ca'), E=150 MeV; measured (particle)γ(θ), Eγ, Iγ, recoil distance following Coulomb excitation. 168Er levels deduced T1/2, δ, E2 matrix elements.

doi: 10.1016/0375-9474(90)90040-S
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1983HE04      Nucl.Phys. A396, 329c (1983)

W.Hennerici, V.Metag, H.J.Hennrich, R.Repnow, W.Wahl, D.Habs, K.Helmer, U.v.Helmolt, H.W.Heyng, B.Kolb, D.Pelte, D.Schwalm, R.S.Simon, R.Albrecht

Spin Dependence and Angular Correlation of Giant Resonances Studied in (HI, xn) Reactions

NUCLEAR REACTIONS 128Te(34S, xn), E=155 MeV; measured Eγ, Iγ, γ(θ), γγ(θ); deduced evaporation residue decay characteristics, possible giant resonace effects.

doi: 10.1016/0375-9474(83)90029-5
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Note: The following list of authors and aliases matches the search parameter K.Helmer: , K.G.HELMER