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NSR database version of April 27, 2024.

Search: Author = J.U.Andersen

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2012AN03      Phys.Rev. C 85, 044609 (2012)

J.U.Andersen, J.Chevallier, J.S.Forster, S.A.Karamian, C.R.Vane, J.R.Beene, C.J.Gross, H.F.Krause, J.F.Liang, D.Shapira, A.Uguzzoni

Time delays in heavy-ion-induced fission of medium-Z nuclei, measured by crystal blocking

NUCLEAR REACTIONS Mo(³²S, X), E=170, 180 MeV; Mo(⁴⁸Ti, X), E=225, 240 MeV; Mo(⁵⁸Ni, X), E=300 MeV; W, Mo(⁷⁴Ge, X), E=400, 450 MeV; measured spectra of elastically scattered ions and fission fragments, energy loss, blocking lifetimes, blocking dips from elastic scattering at HRIBF facility, fission energy distribution, fission blocking dips, time delays in fission by crystal blocking of fission fragments. Comparison with continuum-model and statistical model calculations.

doi: 10.1103/PhysRevC.85.044609
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2008AN14      Phys.Rev. C 78, 064609 (2008)

J.U.Andersen, J.Chevallier, J.S.Forster, S.A.Karamian, C.R.Vane, J.R.Beene, A.Galindo-Uribarri, J.Gomez del Campo, C.J.Gross, H.F.Krause, E.Padilla-Rodal, D.Radford, D.Shapira, C.Broude, F.Malaguti, A.Uguzzoni

Attosecond time delays in heavy-ion induced fission measured by crystal blocking

NUCLEAR REACTIONS W(³²S, ³²S), (³²S, X), E=180 MeV; W(⁴⁸Ti, ⁴⁸Ti), (⁴⁸Ti, X), E=240-255 MeV; W(⁵⁸Ni, ⁵⁸Ni), (⁵⁸Ni, ⁵⁸Ni'), (⁵⁸Ni, X), E=330-375 MeV; W(⁷⁴Ge, ⁷⁴Ge), (⁷⁴Ge, X), E=390 MeV; measured fission energy spectra, σ; calculated blocking dips. Continuum model calculations.

doi: 10.1103/PhysRevC.78.064609
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2007AN29      Phys.Rev.Lett. 99, 162502 (2007)

J.U.Andersen, J.Chevallier, J.S.Forster, S.A.Karamian, C.R.Vane, J.R.Beene, A.Galindo-Uribarri, J.Gomez del Campo, H.F.Krause, E.Padilla-Rodal, D.Radford, C.Broude, F.Malaguti, A.Uguzzoni

Crystal Blocking Measurements of the Time Delay of Fission Induced by ³²S, ⁴⁸Ti, and ⁵⁸Ni Bombardment of W

NUCLEAR REACTIONS W(³²S, F), E=180 MeV; W(⁴⁸Ti, F), E=240-255 MeV; W(⁵⁸Ni, F), E=315-375 MeV; measured fission yields. Deduced fission delay.

doi: 10.1103/PhysRevLett.99.162502
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2003KA15      Eur.Phys.J. A 17, 49 (2003)

S.A.Karamian, J.S.Forster, J.U.Andersen, W.Assmann, C.Broude, J.Chevallier, J.S.Geiger, F.Gruner, V.A.Khodyrev, F.Malaguti, A.Uguzzoni

Fission lifetimes of Th nuclei measured by crystal blocking

NUCLEAR REACTIONS W(³²S, ³²S), (³²S, F), E=170-180 MeV; measured scattered particle and fission fragment spectra, blocking pattern due to target crystal; deduced fission lifetime features. ²¹⁴Th calculated compound nucleus T_1/2, fission probability vs energy, spin. Crystal blocking technique.

doi: 10.1140/epja/i2002-10139-0
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1996AN26      Nucl.Instrum.Methods Phys.Res. B118, 190 (1996)

J.U.Andersen, G.C.Ball, J.A.Davies, J.S.Forster, J.S.Geiger, R.Haakenaasen, N.E.Hecker, L.E.Rehn, R.P.Sharma, A.Uguzzoni

Use of the 7.6 MeV ¹⁶O(α, α) Resonance in Studying the Anomalous Channeling Behaviour of YBa₂Cu₃O(7-x) Near T(c)

NUCLEAR REACTIONS ¹⁶O, Y, Ba, Cu(α, α), E=7.62 MeV; measured σ(θ); deduced YBa₂Cu₃O(7-x) channeling behaviour.

doi: 10.1016/0168-583X(96)00243-1
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1983JO04      Nucl.Phys. A396, 479c (1983)

B.Jonson, J.U.Andersen, G.J.Beyer, G.Charpak, A.De Rujula, B.Elbek, H.A.Gustafsson, P.G.Hansen, P.Knudsen, E.Laegsgaard, J.Pedersen, H.L.Ravn

Determination of the Electron-Neutrino Mass from Experiments on Electron-Capture Beta Decay

RADIOACTIVITY ¹⁹³Pt(EC); measured E(L X-ray), I(L X-ray), internal bremsstrahlung Eγ, Iγ, γ(X-ray)-coin; deduced Q(EC), electron neutrino mass upper limit. ¹⁶³Ho(EC) [from Ta(p, X), E=600 MeV]; measured Auger electrons, E(X-ray), I(X-ray); deduced T_1/2, electron neutrino mass upper limit. Reaction data input.

doi: 10.1016/0375-9474(83)90040-4
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1982AN03      Nucl.Instrum.Methods 192, 79 (1982)

J.U.Andersen, E.Laegsgaard, M.Lund

Impact-Parameter Dependence of K-Shell Ionization

ATOMIC PHYSICS Cu, Ag, Au(p, X), E=0.5-2.5 MeV; measured K-shell ionization probability; deduced impact parameter dependence. Semi-classical calculations, first Born approximation.

doi: 10.1016/0029-554X(82)90742-X
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1982AN19      Phys.Lett. 113B, 72 (1982)

J.U.Andersen, G.J.Beyer, G.Charpak, A.De Rujula, B.Elbek, H.A.Gustafsson, P.G.Hansen, B.Jonson, P.Knudsen, E.Laegsgaard, J.Pedersen, H.L.Ravn

A Limit on the Mass of the Electron Neutrino: The case of ¹⁶³Ho

NUCLEAR REACTIONS ¹⁶³Dy(d, t), ¹⁶²Dy(³He, d), E not given; measured Q-value difference. ¹⁶³Dy, ¹⁶³Ho deduced mass difference.

RADIOACTIVITY ¹⁶³Ho(EC) [from Ta(p, X), E=600 MeV, mass separation]; measured partial decay T_1/2; deduced T_1/2, electron neutrino mass upper limit. Mass excess input from reaction data.

doi: 10.1016/0370-2693(82)90112-5
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1980LA04      Nucl.Instrum.Methods 169, 293 (1980)

E.Laegsgaard, J.U.Andersen, F.Hogedal

Accurate Determination of Cross Sections for K-Shell Ionization by Proton Impact

NUCLEAR REACTIONS Ti, Fe, Cu, Se, Zr, Ag(p, p), (p, p'), E=1-2 MeV; measured σ(Ep), X-ray production σ; deduced K-shell ionization σ.

1979AN12      Nucl.Phys. A324, 39 (1979)

J.U.Andersen, N.G.Chechenin, A.S.Jensen, K.Jorgensen, E.Laegsgaard

Decay Times for Second-Chance Fission of ²³⁹U Studied by Crystal Blocking

NUCLEAR REACTIONS ²³⁸U(n, F), E=4.9, 5.5, 7.2, 7.5 MeV; measured blocking patterns. ²³⁹U, ²³⁸U deduced compound nuclear T_1/2. Compared to theoretical calculation. Natural UO₂ single-crystal target.

doi: 10.1016/0375-9474(79)90076-9
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1977AL02      Nucl.Phys. A279, 278 (1977)

R.B.Alexander, J.U.Andersen, K.G.Prasad

Measurement of Compound Nuclear Lifetimes by the Crystal Blocking Technique

NUCLEAR REACTIONS ²⁷Al(p, α), E=885 keV; measured blocking effect. ²⁸Si deduced mean T_1/2. Compared methods of analysis; investigated depth effects. Natural, single crystal target.

doi: 10.1016/0375-9474(77)90229-9
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1976AN07      Phys.Rev.Lett. 36, 1539 (1976)

J.U.Andersen, E.Laegsgaard, K.O.Nielsen, W.M.Gibson, J.S.Forster, I.V.Mitchell, D.Ward

Time Evolution of Heavy-Ion-Induced Fission Studied by Crystal Blocking

NUCLEAR REACTIONS W(¹⁶O, F), E=40, 90, 97 MeV; measured crystal-blocking angular distribution shapes.

doi: 10.1103/PhysRevLett.36.1539
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1975AN05      Nucl.Phys. A241, 317 (1975)

J.U.Andersen, K.O.Nielsen, J.Skak-Nielsen, R.Hellborg, K.G.Prasad

Fission Lifetimes Measured by Crystal Blocking of Fragments from ²³⁸U(n, f) Reactions

NUCLEAR REACTIONS ²³⁸U(n, F), E=1.7, 2.3, 3.6 MeV; measured σ(fragment, θ). ²³⁹U deduced T_1/2. Blocking effect.

doi: 10.1016/0375-9474(75)90321-8
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1973SH07      Nucl.Phys. A204, 371 (1973)

R.P.Sharma, J.U.Andersen, K.O.Nielsen

Application of the Blocking Technique to Measure Lifetimes of Nuclear Levels Excited in (p, α) Resonance Reactions in P and Al

NUCLEAR REACTIONS ³¹P(p, α), E=642 keV; ²⁷Al(p, α), E=633 keV; studied blocking pattern. ³²S, ²⁸Si deduced compound nuclear T_1/2. GaP, Al single-crystal targets.

doi: 10.1016/0375-9474(73)90279-0
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