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Search: Author = C.C.Sahm

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1993QU03      Z.Phys. A346, 119 (1993)

A.B.Quint, W.Reisdorf, K.-H.Schmidt, P.Armbruster, F.P.Hessberger, S.Hofmann, J.Keller, G.Munzenberg, H.Stelzer, H.-G.Clerc, W.Morawek, C.-C.Sahm

Investigation of the Fusion of Heavy Nearly Symmetric Systems

NUCLEAR REACTIONS, ICPND ^90,92,96Zr, ^92,96,100Mo, ¹⁰⁴Ru, ¹¹⁰Pd(¹⁰⁰Mo, X), E(cm)=3-5 MeV/nucleon; ⁹⁶Zr(⁹⁶Zr, X), E(cm)=3-5 MeV/nucleon; measured evaporation residue production σ(E), Eα, Iα; deduced evidence for ¹⁹¹Po. Other reactions discussed.

RADIOACTIVITY ¹⁹¹Po(α) [from ¹⁰⁰Mo(¹⁰⁰Mo, xn), E=3-5 MeV/nucleon]; measured Eα, Iα; deduced T_1/2, Qα.

doi: 10.1007/BF01294627
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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, T_1/2. ^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
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1986KE03      Nucl.Phys. A452, 173 (1986)

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

Cold Fusion in Symmetric ⁹⁰Zr-Induced Reactions

RADIOACTIVITY ^{172,173,174,175,176,177}Ir, ¹⁷⁵Pt, ^178,179,180Au, ¹⁸¹Hg, ¹⁸²Tl, ^181,182,183Pb(α); measured E(α); deduced α-branching ratios.

NUCLEAR REACTIONS ⁸⁹Y, ^90,92,96Zr, ⁹⁴Mo(⁹⁰Zr, xn), E=321-390 MeV; measured evaporation residue σ above, around, below the fusion barriers; deduced fusion probabilities, barrier distributions. ¹⁷⁹Au, ^180,182Hg, ¹⁸⁴Pb deduced γ-transitions. Enriched targets, velocity filter, parallel-plate avalanche counter, surface-barrier detectors.

doi: 10.1016/0375-9474(86)90514-2
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1986MU13      Phys.Rev. C34, 1353 (1986)

T.Murakami, C.-C.Sahm, R.Vandenbosch, D.D.Leach, A.Ray, M.J.Murphy

Fission Probes of Sub-Barrier Fusion Cross Section Enhancements and Spin Distribution Broadening

NUCLEAR REACTIONS, ICPND ²³⁶U(¹²C, F), E=60-68 MeV; ²⁰⁸Pb, ²³²Th(¹⁶O, F), E=77-86 MeV; measured fission σ(E), σ(fragment θ), σ(fragment) vs mass. ²⁰⁸Pb, ²³²Th, ²³⁶U deduced quadrupole, octupole vibrational state parameters β, B(λ). ²⁴⁸Cf deduced mean-square spin distribution. Enriched targets, TOF telescope. Optical model and coupled channels calculations.

doi: 10.1103/PhysRevC.34.1353
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC1396.

1986SA29      Phys.Rev. C34, 2165 (1986)

C.-C.Sahm, T.Murakami, J.G.Cramer, A.J.Lazzarini, D.D.Leach, D.R.Tieger, R.A.Loveman, W.G.Lynch, M.B.Tsang, J.Van der Plicht

Total Reaction Cross Section for ¹²C on ¹²C, ⁴⁰Ca, ⁹⁰Zr, and ²⁰⁸Pb between 10 and 35 MeV/nucleon

NUCLEAR REACTIONS, MECPD ¹²C, ⁴⁰Ca, ⁹⁰Zr, ²⁰⁸Pb(¹²C, ¹²C), E=10-35 MeV/nucleon; measured σ(θ); deduced reaction σ, model parameters, nucleon-nucleon σ role. Optical, Glauber models.

doi: 10.1103/PhysRevC.34.2165
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1986SC07      Phys.Lett. 168B, 39 (1986)

K.-H.Schmidt, R.S.Simon, J.-G.Keller, F.P.Hessberger, G.Munzenberg, B.Quint, H.-G.Clerc, W.Schwab, U.Gollerthan, C.-C.Sahm

Gamma-Spectroscopic Investigations in the Radiative Fusion Reaction ⁹⁰Zr + ⁹⁰Zr

NUCLEAR REACTIONS ⁹⁰Zr(⁹⁰Zr, X), E=358 MeV; measured radiative fusion Eγ, Iγ; deduced reaction mechanism. ¹⁸⁰Hg deduced statistical deexcitation, E1 transition strength.

doi: 10.1016/0370-2693(86)91456-5
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1986VA09      Phys.Rev.Lett. 56, 1234 (1986)

R.Vandenbosch, T.Murakami, C.-C.Sahm, D.D.Leach, A.Ray, M.J.Murphy

Anomalously Broad Spin Distributions in Sub-barrier Fusion Reactions

NUCLEAR REACTIONS ²³⁶U(¹²C, F), E=62, 66 MeV; ²³²Th(¹⁶O, F), E=85.7 MeV; measured fission fragment σ(θ). ²⁴⁸Cf deduced mean square spin value.

doi: 10.1103/PhysRevLett.56.1234
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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, T_1/2. ²⁵⁸Rf(SF) [from ²⁵⁸Db(EC-decay)]; measured T_1/2, 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.

1985RE11      Nucl.Phys. A444, 154 (1985)

W.Reisdorf, F.P.Hessberger, K.D.Hildenbrand, S.Hofmann, G.Munzenberg, K.-H.Schmidt, W.F.W.Schneider, K.Summerer, G.Wirth, J.V.Kratz, K.Schlitt, C.-C.Sahm

Fusability and Fissionability in ⁸⁶Kr-Induced Reactions Near and Below the Fusion Barrier

NUCLEAR REACTIONS ^70,76Ge, ^92,100Mo, ^99,102,104Ru(⁸⁶Kr, X), E=257-369 MeV; measured evaporation residues; deduced evaporation residue σ at, below Coulomb barrier, barrier height, barrier fluctuation, role of coupling to inelastic channels. ^156,162Er, ^178,186Pt, ^185,188,190Hg deduced effective fission barriers. Enriched targets, velocity filter, K X-ray activation method.

doi: 10.1016/0375-9474(85)90296-9
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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
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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, ^{176,177,178,179,180}Hf, 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
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1984KE03      Phys.Rev. C29, 1569 (1984)

J.G.Keller, K.-H.Schmidt, H.Stelzer, W.Reisdorf, Y.K.Agarwal, F.P.Hessberger, G.Munzenberg, H.-G.Clerc, C.-C.Sahm

Fusion of the System ⁹⁰Zr + ⁹⁰Zr

NUCLEAR REACTIONS, ICPND ⁹⁰Zr(⁹⁰Zr, X), E(cm) ≈ 172-195 MeV; measured compound residue σ(E); deduced fusion barrier, fluctuations.

doi: 10.1103/PhysRevC.29.1569
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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
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1984SC13      Z.Phys. A316, 19 (1984)

K.-H.Schmidt, C.-C.Sahm, K.Pielenz, H.-G.Clerc

Some Remarks on the Error Analysis in the Case of Poor Statistics

NUCLEAR REACTIONS ⁹⁶Zr(¹²⁴Sn, X), E=570 MeV; measured evaporation residue decay Eα, Iα; deduced evidence for ²¹⁴Th. Correlation techniques, development of critical analysis.

RADIOACTIVITY ²¹⁴Th(α) [from ⁹⁶Zr(¹²⁴Sn, X), E=570 MeV]; measured Eα, T_1/2. Correlation techniques, development of critical error analysis.

doi: 10.1007/BF01415656
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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, ^{177,178,179,180,176}Hf(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
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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, T_1/2; deduced Iα, Iγ. Comparison with ^217mPa decay.

doi: 10.1016/0375-9474(83)90413-X
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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 T_1/2.

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
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1983KE01      Z.Phys. A311, 243 (1983)

J.G.Keller, H.-G.Clerc, K.-H.Schmidt, Y.K.Agarwal, F.P.Hessberger, R.Hingmann, G.Munzenberg, W.Reisdorf, C.C.Sahm

Observation of Radiative Capture in the Reaction ⁹⁰Zr + ⁹⁰Zr

NUCLEAR REACTIONS ⁹⁰Zr(⁹⁰Zr, X), E=351, 360 MeV; measured Eα, Iα following evaporation residue decay; deduced heavy system radiative capture.

doi: 10.1007/BF01415109
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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 T_1/2, decay characteristics, possible J, π. Correlation analysis, shell model.

doi: 10.1007/BF01420147
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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.

1981MU06      Z.Phys. A300, 107 (1981)

G.Munzenberg, S.Hofmann, F.P.Hessberger, W.Reisdorf, K.H.Schmidt, J.H.R.Schneider, P.Armbruster, C.C.Sahm, B.Thuma

Identification of Element 107 by α Correlation Chains

RADIOACTIVITY ²⁶²Bh [from ²⁰⁹Bi(⁵⁴Cr, n), E=4.85 MeV/nucleon]; ²⁵⁸Db [from ²⁰⁹Bi(⁵⁰Ti, n), E=4.75 MeV/nucleon]; measured Eα, T_1/2. Evaporation residue implantation technique.

NUCLEAR REACTIONS ²⁰⁹Bi(⁵⁴Cr, n), E=4.85 MeV/nucleon; ²⁰⁹Bi(⁵⁰Ti, n), E=4.75 MeV/nucleon; measured Eα, T_1/2; deduced evidence for ²⁶²Bh. Evaporation residue implantation technique.

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
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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
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