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NSR database version of April 11, 2024.

Search: Author = D.Vermeulen

Found 26 matches.

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1992GA31      Radiochim.Acta 57, 93 (1992)

H.W.Gaggeler, D.T.Jost, J.Kovacs, U.W.Scherer, A.Weber, D.Vermeulen, A.Turler, K.E.Gregorich, R.A.Henderson, K.R.Czerwinski, B.Kadkhodayan, D.M.Lee, M.Nurmia, D.C.Hoffman, J.V.Kratz, M.K.Gober, H.P.Zimmermann, M.Schadel, W.Bruchle, E.Schimpf, I.Zvara

Gas Phase Chromatography Experiments with Bromides for Tantalum and Element 105

RADIOACTIVITY 262,263Db(SF) [from 249Bk(18O, X), E=114 MeV]; measured decay products, Eα, Iα; deduced T1/2, σ.

1991GA28      Nucl.Instrum.Methods Phys.Res. A309, 201 (1991)

H.W.Gaggeler, D.T.Jost, U.Baltensperger, A.Weber, A.Kovacs, D.Vermeulen, A.Turler

OLGA II, an on-line gas chemistry apparatus for application in heavy element research

RADIOACTIVITY 214Po, 214,215At, 218Rn, 219Fr, 222Ra, 222,223Ac, 226Th, 226,227Pa(α) [from 232Th(p, X)]; measured Eα, αα-coin.

doi: 10.1016/0168-9002(91)90103-W
Citations: PlumX Metrics

1991RI07      Z.Phys. A339, 427 (1991)

F.Risse, W.Bertl, P.David, H.Hanscheid, E.Hermes, J.Konijn, C.T.A.M.de Laat, H.Pruys, Ch.F.G.Rosel, W.Schrieder, A.Taal, D.Vermeulen

Muon Attachment in Prompt Fission of 237Np

NUCLEAR REACTIONS 237Np(μ-, F), E at rest; measured fission fragment mass, total kinetic energy release, (fragment)(electron)-coin; deduced fission fragment muon attachment probability.

doi: 10.1007/BF01288426
Citations: PlumX Metrics

1989MU09      Z.Phys. A333, 163 (1989)

G.Munzenberg, P.Armbruster, S.Hofmann, F.P.Hessberger, H.Folger, J.G.Keller, V.Ninov, K.Poppensieker, A.B.Quint, W.Reisdorf, K.-H.Schmidt, J.R.H.Schneider, H.-J.Schott, K.Summerer, I.Zychor, M.E.Leino, D.Ackermann, U.Gollerthan, E.Hanelt, W.Morawek, D.Vermeulen, Y.Fujita, T.Schwab

Element 107

NUCLEAR REACTIONS 209Bi(54Cr, xn), E=4.87-5.07 MeV/nucleon; measured α-spectra; deduced evidence for 261,262,262mBh, formation σ, reaction σ(E).

RADIOACTIVITY 261,262,262mBh(α) [from 209Bi(54Cr, xn), E=4.87-5.07 MeV/nucleon]; measured α-spectra, αα-correlations, T1/2; deduced no SF-decay evidence.

1986HE28      J.Less-Common Met. 122, 445 (1986)

F.P.Hessberger, G.Munzenberg, S.Hofmann, P.Armbruster, Y.K.Agarwal, W.Reisdorf, K.Poppensieker, K.-H.Schmidt, J.R.H.Schneider, W.F.W.Schneider, H.J.Schott, C.-C.Sahm, D.Vermeulen, B.Thuma

Experiments on the Synthesis of Neutron-Deficient Isotopes with Atomic Numbers in the Region from Z = 102 to Z = 105

RADIOACTIVITY 258,257Db, 256,255Rf, 254,253Lr(α) [from 206,208Pb(48Ca, xn), E ≈ 15-30 MeV/nucleon; 207,208Pb, 209Bi(50Ti, xn), E=20-35 MeV/nucleon]; measured Eα, T1/2. 256,255Rf(SF); measured total kinetic energy release.

NUCLEAR REACTIONS 206,208Pb(48Ca, xn), E ≈ 15-30 MeV/nucleon; 207,208Pb, 209Bi(50Ti, xn)258Db/257Db/255Rf/256Rf/254Lr/253Lr, E ≈ 20-35 MeV/nucleon; measured evaporation residue, Z=104, 105, Lr isotope production σ(E).

doi: 10.1016/0022-5088(86)90440-6
Citations: PlumX Metrics

1985AR02      Phys.Rev.Lett. 54, 406 (1985)

P.Armbruster, Y.K.Agarwal, W.Bruchle, M.Brugger, J.P.Dufour, H.Gaggeler, F.P.Hessberger, S.Hofmann, P.Lemmertz, G.Munzenberg, K.Poppensieker, W.Reisdorf, M.Schadel, K.-H.Schmidt, J.H.R.Schneider, W.F.W.Schneider, K.Summerer, D.Vermeulen, G.Wirth, A.Ghiorso, K.E.Gregorich, D.Lee, M.Leino, K.J.Moody, G.T.Seaborg, R.B.Welch, P.Wilmarth, S.Yashita, C.Frink, N.Greulich, G.Herrmann, U.Hickmann, N.Hildebrand, J.V.Kratz, N.Trautmann, M.M.Fowler, D.C.Hoffman, W.R.Daniels, H.R.von Gunten, H.Dornhofer

Attempts to Produce Superheavy Elements by Fusion of 48Ca with 248Cm in the Bombarding Energy Range of 4.5-5.2 MeV/u

NUCLEAR REACTIONS 248Cm(48Ca, X), E=4.5-5.2 MeV/nucleon; measured superheavy production σ upper limits vs T1/2. Different separation techniques.

doi: 10.1103/PhysRevLett.54.406
Citations: PlumX Metrics

1985HE06      Z.Phys. A321, 317 (1985)

F.P.Hessberger, G.Munzenberg, S.Hofmann, W.Reisdorf, K.H.Schmidt, H.J.Schmidt, P.Armbruster, R.Hingmann, B.Thuma, D.Vermeulen

Study of Evaporation Residues Produced in Reaction of 207,208Pb with 50Ti

RADIOACTIVITY 255Rf, 256Rf(SF), (α), 257Rf(α) [from 208,207Pb(50Ti, xn), E=4.75, 4.85 MeV/nucleon]; measured Eα, Iα, α-, SF-decay T1/2, α-branching.

NUCLEAR REACTIONS 208Pb(50Ti, n), (50Ti, 2n), (50Ti, 3n), 207Pb(50Ti, n), (50Ti, 2n), E=4.75, 4.85 MeV/nucleon; measured evaporation residue σ, σ(Eα); deduced reaction mechanism, residue SF activity.

1985HE22      Z.Phys. A322, 557 (1985)

F.P.Hessberger, G.Munzenberg, S.Hofmann, Y.K.Agarwal, K.Poppensieker, W.Reisdorf, K.-H.Schmidt, J.R.H.Schneider, W.F.W.Schneider, H.J.Schott, P.Armbruster, B.Thuma, C.-C.Sahm, D.Vermeulen

The New Isotopes 258105, 257105, 254Lr and 253Lr

RADIOACTIVITY 258Db, 257Db, 253,254Lr(α) [from 209Bi(50Ti, X), E=4.65-4.95 MeV/nucleon]; measured Eα, Iα, T1/2. 258Rf(SF) [from 258Db(EC-decay)]; measured T1/2, fission fragment total kinetic energy.

NUCLEAR REACTIONS 209Bi(50Ti, X), E=4.65-4.95 MeV/nucleon; measured Eα, Iα, evaporation residue σ(E) for one-, two-neutron emission; deduced evidence for 258Db, 257Db, 253,254Lr.

1985SA21      Nucl.Phys. A441, 316 (1985)

C.-C.Sahm, H.-G.Clerc, K.-H.Schmidt, W.Residorf, P.Armbruster, F.P.Hessberger, J.G.Keller, G.Munzenberg, D.Vermeulen

Fusion Probability of Symmetric Heavy, Nuclear Systems Determined from Evaporation-Residue Cross Sections

NUCLEAR REACTIONS 172,173,176Yb(48Ca, X), E=196-225 MeV; 121,123Sb(86Kr, X), E=337-389 MeV; 90,92,94,96Zr(124Sn, X), E=472-569 MeV; measured evaporation residue σ; deduced fusion probabilities. Enriched targets, velocity filter, secondary electron detector, surface-barrier detectors, delayed coincidences.

doi: 10.1016/0375-9474(85)90036-3
Citations: PlumX Metrics

1984CL03      Nucl.Phys. A419, 571 (1984)

H.-G.Clerc, J.G.Keller, C.-C.Sahm, K.-H.Schmidt, H.Schulte, D.Vermeulen

Fusion-Fission and Neutron-Evaporation-Residue Cross Sections in 40Ar- and 50Ti- Induced Fusion Reactions

NUCLEAR REACTIONS 165Ho, 169Tm, 174Yb, 175Lu, 176,177,178,179,180Hf, 181Ta, 208Pb(40Ar, X), E=170-208 MeV; 208Pb, 209Bi(50Ti, X), E=235-260 MeV; measured fusion σ(E), neutron evaporation residue σ(E); deduced fusion barriers, fusion radii. Enriched targets.

doi: 10.1016/0375-9474(84)90634-1
Citations: PlumX Metrics

1984MU07      Z.Phys. A315, 145 (1984)

G.Munzenberg, W.Reisdorf, S.Hofmann, Y.K.Agarwal, F.P.Hessberger, K.Poppensieker, J.R.H.Schneider, W.F.W.Schneider, K.-H.Schmidt, H.-J.Schott, P.Armbruster, C.-C.Sahm, D.Vermeulen

Evidence for Element 109 from One Correlated Decay Sequence following the Fusion of 58Fe with 209Bi

RADIOACTIVITY 266Mt(SF) [from 209Bi(58Fe, X), E=5.15 MeV/nucleon]; measured Eα, Iα, αα-coin, SF-decay.

NUCLEAR REACTIONS 209Bi(58Fe, X), E=4.95, 5.05, 5.15 MeV/nucleon; measured σ(fragment) vs mass, Eα, Iα, SF-decay; deduced evidence for compound nucleus 266Mt.

1984SA24      Z.Phys. A319, 113 (1984)

C.-C.Sahm, H.-G.Clerc, K.-H.Schmidt, W.Reisdorf, P.Armbruster, F.P.Hessberger, J.G.Keller, G.Munzenberg, D.Vermeulen

Hindrance of Fusion in Central Collisions of Heavy, Symmetric Nuclear Systems

NUCLEAR REACTIONS 92,94,96Zr(124Sn, xn), (86Kr, xn), E not given; measured evaporation σ(E), fusion probability vs residual excitation; deduced fusion hindrance in symmetric system central collisions.

doi: 10.1007/BF01415623
Citations: PlumX Metrics

1984SC07      Z.Phys. A315, 159 (1984)

K.-H.Schmidt, J.G.Keller, D.Vermeulen

Temperature-Induced Deformation - A Possible Mechanism for Washing Out Spherical Shell Effects in the Nuclear Level Density

NUCLEAR STRUCTURE 216Th, 252Fm; calculated level density; deduced shell effect washout. Shell, rotational motion interplay.

doi: 10.1007/BF01419374
Citations: PlumX Metrics

1984VE09      Z.Phys. A318, 157 (1984)

D.Vermeulen, H.-G.Clerc, C.-C.Sahm, K.-H.Schmidt, J.G.Keller, G.Munzenberg, W.Reisdorf

Cross Sections for Evaporation Residue Production near the N = 126 Shell Closure

NUCLEAR REACTIONS 165Ho, 169Tm, 175Lu, 171,174Yb, 181Ta, 177,178,179,180,176Hf(40Ar, X), E=192 MeV; measured evaporation residue production σ, fragment α-decay, Eα, Iα; deduced low shell stabilizing influence, superheavy production optimum conditions.

doi: 10.1007/BF01413464
Citations: PlumX Metrics

1983HI08      Nucl.Phys. A404, 51 (1983)

R.Hingmann, H.-G.Clerc, C.-C.Sahm, D.Vermeulen, K.-H.Schmidt, J.G.Keller

Evidence for an Isomeric State in 216Th

NUCLEAR REACTIONS 180Hf(40Ar, 4n), (40Ar, 5n), E=165-200 MeV; measured residuals production σ(E). 180Hf(40Ar, X), E=180 MeV; measured Eα, Iα from evaporation residue decay; deduced evidence for 216mTh.

RADIOACTIVITY 216mTh [from 178,179,180Hf(40Ar, xn), E=165-200 MeV]; measured Eα, T1/2; deduced Iα, Iγ. Comparison with 217mPa decay.

doi: 10.1016/0375-9474(83)90413-X
Citations: PlumX Metrics

1983HI12      Z.Phys. A313, 141 (1983)

R.Hingmann, H.-G.Clerc, C.-C.Sahm, D.Vermeulen, K.-H.Schmidt, J.G.Keller

Identification of 222U and 221Pa by α-Correlation Chains

RADIOACTIVITY 222U(α) [from W(40Ar, 4n), E=4.5 MeV/nucleon]; 221Pa(α) [from 186W(40Ar, 4np), E=4.72 MeV/nucleon]; measured αα-correlation; deduced T1/2.

NUCLEAR REACTIONS W(40Ar, 4n), E=4.5 MeV/nucleon; 186W(40Ar, 4np), E=4.72 MeV/nucleon; measured αα-correlation; deduced evidence for 222U, 221Pa.

doi: 10.1007/BF02115854
Citations: PlumX Metrics

1982DA04      Nucl.Phys. A376, 94 (1982)

M.Dahlinger, D.Vermeulen, K.-H.Schmidt

Empirical Saddle-Point and Ground-State Masses as a Probe of the Droplet Model

COMPILATION A=97-253; compiled fission barrier data; deduced fissility parameter isospin dependence. Liquid drop, droplet models.

doi: 10.1016/0375-9474(82)90535-8
Citations: PlumX Metrics

1982HI14      Z.Phys. A309, 27 (1982)

R.Hingmann, H.-G.Clerc, C.-C.Sahm, D.Vermeulen, K.-H.Schmidt, J.G.Keller

Alpha Decay Properties of 199Rn and 199mRn

NUCLEAR REACTIONS 86Kr(116Sn, X), (116Sn, 2n), (116Sn, 3n), E=345-385 MeV; measured residual production σ vs E, (evaporation residue)(α)(t), αα(t). 199m,199Rn levels deduced α-decay T1/2, decay characteristics, possible J, π. Correlation analysis, shell model.

doi: 10.1007/BF01420147
Citations: PlumX Metrics

1982MU15      Z.Phys. A309, 89 (1982)

G.Munzenberg, P.Armbruster, F.P.Hessberger, S.Hofmann, K.Poppensieker, W.Reisdorf, J.H.R.Schneider, W.F.W.Schneider, K.-H.Schmidt, C.-C.Sahm, D.Vermeulen

Observation of One Correlated α-Decay in the Reaction 58Fe on 209Bi → 267109

RADIOACTIVITY 266Mt [from 209Bi(58Fe, n), E=4.95-5.15 MeV/nucleon]; measured Eα, time correlated α-spectra; deduced α-decay chain correlation followed by 258Rf fission. Evaporation residue implantation technique.

NUCLEAR REACTIONS 209Bi(58Fe, n), E=4.95-5.15 MeV/nucleon; measured Eα, time correlated α-spectra; deduced evidence for 266Mt. Evaporation residue implantation technique.

1981MU12      Z.Phys. A302, 7 (1981)

G.Munzenberg, S.Hofmann, W.Faust, F.P.Hessberger, W.Reisdorf, K.-H.Schmidt, T.Kitahara, P.Armbruster, K.Guttner, B.Thuma, D.Vermeulen

The New Isotopes 247Md, 243Fm, 239Cf, and Investigation of the Evaporation Residues from Fusion of 206Pb, 208Pb, and 209Bi with 40Ar

NUCLEAR REACTIONS 206Pb, 208Pb, 209Bi(40Ar, X), E=4.8-5.25 MeV/nucleon; measured Eα, α-decay T1/2; deduced evidence for 247Md, 239Cf, 243Fm. In-flight velocity filter evaporation residue separation.

RADIOACTIVITY 247Md, 239Cf, 243Fm [from 206,208Pb, 209Bi(40Ar, X), E=4.8-5.25 MeV/nucleon]; measured Eα, T1/2. In-flight velocity filter evaporation residue separation.

1981SC14      Z.Phys. A301, 21 (1981)

K.-H.Schmidt, P.Armbruster, F.P.Hessberger, G.Munzenberg, W.Reisdorf, C.-C.Sahm, D.Vermeulen, H.-G.Clerc, J.Keller, H.Schulte

The Barrier for Compound-Nucleus Formation in the Nearly Symmetric Systems 86Kr + 123Sb → 209Fr and 124Sn + 94Zr → 218Th

NUCLEAR REACTIONS 123Sb(86Kr, xn), E(cm)=197.5-230 MeV; 94Zr(124Sn, xn), E(cm)=210-245 MeV; measured σ(fusion, E); 94Zr(124Sn, xn), E(cm)=207.5-245 MeV; measured σ(evaporation residue vs E), σ(fusion, E); deduced compound nucleus formation barrier. Velocity filter, ΔE-E detectors, α identification technique, enriched target.

doi: 10.1007/BF01412459
Citations: PlumX Metrics

1980SA24      Z.Phys. A297, 241 (1980)

C.-C.Sahm, H.Schulte, D.Vermeulen, J.Keller, H.-G.Clerc, K.-H.Schmidt, F.Hessberger, G.Munzenberg

The Influence of the Fission Barrier on the Mass Distribution in Reactions with Symmetric Fragmentation

NUCLEAR REACTIONS, Fission 144Sm, 176Hf(40Ar, X), (40Ar, F), E=190 MeV; 208Pb(40Ar, X), (40Ar, F), E=208 MeV; 165Ho, 175Lu, 181Ta(40Ar, X), (40Ar, F), E not given; measured σ(fragment mass, E). 184Hg, 205At, 215Ac, 216Th, 221Pa, 248Fm deduced symmetric fission fragmentation contribution, fission barrier influence.

doi: 10.1007/BF01892804
Citations: PlumX Metrics

1980VE01      Z.Phys. A294, 149 (1980)

D.Vermeulen, H.-G.Clerc, W.Lang, K.-H.Schmidt, G.Munzenberg

212Th, a New Isotope

RADIOACTIVITY 212,213,214Th; measured Eα, T1/2, Qα.

NUCLEAR REACTIONS 176Hf(40Ar, xn), E=170-200 MeV; measured production σ(E) for 212,213,214Th.

doi: 10.1007/BF01435049
Citations: PlumX Metrics

1979SC09      Nucl.Phys. A318, 253 (1979)

K.-H.Schmidt, W.Faust, G.Munzenberg, H.-G.Clerc, W.Lang, K.Pielenz, D.Vermeulen, H.Wohlfarth, H.Ewald, K.Guttner

Alpha Decay Properties of New Protactinium Isotopes

RADIOACTIVITY 215,216,217,218,222Pa; measured Eα, T1/2; deduced variation of shell strengths.

NUCLEAR REACTIONS 181Ta(40Ar, xn), 184W(40Ar, pn), E=165-202 MeV; measured production σ. Velocity filter, secondary electron-surface barrier detectors. Delayed coin.

doi: 10.1016/0375-9474(79)90482-2
Citations: PlumX Metrics

1978SC04      Z.Phys. A284, 431 (1978)

K.-H.Schmidt, P.Armbruster, W.Faust, S.Hofmann, G.Munzenberg, W.Reisdorf, H.-G.Clerc, W.Lang, D.Vermeulen, H.Ewald, K.Guttner

Dependence of the Evaporation Residue Production on the Excitation Energy of the Compound Nucleus in the Reaction 40Ar + 164Dy

NUCLEAR REACTIONS 164Dy(40Ar, xn); measured σ(E) for X=4-8.

doi: 10.1007/BF01422114
Citations: PlumX Metrics

1978VE04      Z.Phys. A285, 329 (1978)

D.Vermeulen, K.Farzine, H.v.Buttlar

Levels of 105Pd from the 105m, g-Ag Decay

RADIOACTIVITY 105,105mAg; measured anticompton γ-spectrum, Eγ, Iγ. 105Pd deduced levels, J, π.

doi: 10.1007/BF01408247
Citations: PlumX Metrics

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