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NSR database version of April 27, 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
Citations: PlumX Metrics

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
Citations: PlumX Metrics

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 T_1/2, 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, T_1/2.

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 T_1/2, δ, E2 matrix elements.

doi: 10.1016/0375-9474(90)90040-S
Citations: PlumX Metrics

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
Citations: PlumX Metrics

Note: The following list of authors and aliases matches the search parameter K.Helmer: , K.G.HELMER