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2002NI10      Phys.Rev.Lett. 89, 039901 (2002); see also 1999Ni03

V.Ninov, K.E.Gregorich, W.Loveland, A.Ghiorso, D.C.Hoffman, D.M.Lee, H.Nitsche, W.J.Swiatecki, U.W.Kirbach, C.A.Laue, J.L.Adams, J.B.Patin, D.A.Shaughnessy, D.A.Strellis, P.A.Wilk

Editorial Note: Observation of Superheavy Nuclei Produced in the Reaction of 86Kr with 208Pb

doi: 10.1103/PhysRevLett.89.039901
Citations: PlumX Metrics


1999NI03      Phys.Rev.Lett. 83, 1104 (1999); Erratum Phys.Rev.Lett. 89, 039901 (2002); see also 2002GrZZ

V.Ninov, K.E.Gregorich, W.Loveland, A.Ghiorso, D.C.Hoffman, D.M.Lee, H.Nitsche, W.J.Swiatecki, U.W.Kirbach, C.A.Laue, J.L.Adams, J.B.Patin, D.A.Shaughnessy, D.A.Strellis, P.A.Wilk

Observation of Superheavy Nuclei Produced in the Reaction of 86Kr with 208Pb

NUCLEAR REACTIONS 208Pb(86Kr, n), E=449 MeV; measured α-spectra, (recoil)α-, αα-coin following residual nucleus decay, production σ; deduced evidence for 293Og, 289Lv, 285Fl, 281Cn, 277Ds, 273Hs, 269Sg. Gas-filled separator.

RADIOACTIVITY 293Og, 289Lv, 285Fl, 281Cn, 277Ds, 273Hs(α) [from 208Pb(86Kr, n) and subsequent α-decay]; measured Eα, T1/2.

doi: 10.1103/PhysRevLett.83.1104
Citations: PlumX Metrics


1995GH04      Nucl.Phys. A583, 861c (1995)

A.Ghiorso, D.Lee, L.P.Somerville, W.Loveland, J.M.Nitschke, W.Ghiorso, G.T.Seaborg, P.Wilmarth, R.Leres, A.Wydler, M.Nurmia, K.Gregorich, R.Gaylord, T.Hamilton, N.J.Hannink, D.C.Hoffman, C.Jarzynski, C.Kacher, B.Kadkhodayan, S.Kreek, M.Lane, A.Lyon, M.A.McMahan, M.Neu, T.Sikkeland, W.J.Swiatecki, A.Turler, J.T.Walton, S.Yashita

Evidence for the Synthesis of 267110 Produced by the 59Co + 209Bi Reaction

NUCLEAR REACTIONS 209Bi(59Co, n), E ≈ 5.1 MeV/nucleon; measured Eα, production σ; deduced evidence for 267Ds.

doi: 10.1016/0375-9474(94)00775-I
Citations: PlumX Metrics

Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2565.


1995GH05      Phys.Rev. C51, R2293 (1995)

A.Ghiorso, D.Lee, L.P.Somerville, W.Loveland, J.M.Nitschke, W.Ghiorso, G.T.Seaborg, P.Wilmarth, R.Leres, A.Wydler, M.Nurmia, K.Gregorich, K.Czerwinski, R.Gaylord, T.Hamilton, N.J.Hannink, D.C.Hoffman, C.Jarzynski, C.Kacher, B.Kadkhodayan, S.Kreek, M.Lane, A.Lyon, M.A.McMahan, M.Neu, T.Sikkeland, W.J.Swiatecki, A.Turler, J.T.Walton, S.Yashita

Evidence for the Possible Synthesis of Element 110 Produced by the 59Co + 209Bi Reaction

NUCLEAR REACTIONS 209Bi(59Co, n), E=5.1 MeV/nucleon; measured implanted recoil Bρ, dE/dx, recoil energy; deduced 267Ds synthesis evidence, production σ.

doi: 10.1103/PhysRevC.51.R2293
Citations: PlumX Metrics

Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2565.


1988GH01      Nucl.Instrum.Methods Phys.Res. A269, 192 (1988)

A.Ghiorso, S.Yashita, M.E.Leino, L.Frank, J.Kalnins, P.Armbruster, J.-P.Dufour, P.K.Lemmertz

SASSY, a Gas-Filled Magnetic Separator for the Study of Fusion Reaction Products

NUCLEAR REACTIONS 208Pb(48Ca, 2n), E ≈ 205-220 MeV; measured σ(E), Eα, Iα. Gas filled magnetic separator.

doi: 10.1016/0168-9002(88)90877-7
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


1985SO03      Phys.Rev. C31, 1801 (1985)

L.P.Somerville, M.J.Nurmia, J.M.Nitschke, A.Ghiorso, E.K.Hulet, R.W.Lougheed

Spontaneous Fission of Rutherfordium Isotopes

RADIOACTIVITY 256Rf(SF) [from 249Cf(12C, 5n), E=85 MeV]; 257Rf(SF) [from 249Cf(12C, 4n), E=75 MeV]; 258Rf(SF) [from 246Cm(16O, 4n), E=95 MeV]; 259Rf(SF) [from 245Cm(18O, 4n), E=93 MeV]; 260Rf(SF) [from 249Bk(15N, 4n), E=80 MeV; 248Cm(16O, 4n), E=92 MeV; 249Cf(16O, 3nα), E=96 MeV]; 262Rf(SF) [from 248Cm(18O, 4n), E=89 MeV; 244Pu(22Ne, 4n), E=113 MeV]; measured T1/2(SF), fission branching. Fast tape system.

NUCLEAR REACTIONS, ICPND 244Pu(22Ne, 4n), E=113 MeV; 248Cm(18O, 4n), E=89 MeV; 249Cf(18O, 3nα), E=96 MeV; 248Cm(16O, 4n), E=92 MeV; 249Bk(15N, 4n), E=80 MeV; 245Cm(18O, 4n), E=93 MeV; 246Cm(16O, 4n), E=95 MeV; 249Cf(12C, 4n), E=75 MeV; 249Cf(12C, 5n), E=85 MeV; measured residual production σ, T1/2(SF), fission branch estimate. Fast tape system.

doi: 10.1103/PhysRevC.31.1801
Citations: PlumX Metrics


1981HO32      Phys.Rev. C 24, 495 (1981)

D.C.Hoffman, D.Lee, A.Ghiorso, M.J.Nurmia, K.Aleklett, M.Leino

Fission properties of the 1.5-s spontaneous fission activity produced in bombardment of 248Cm with 18O

RADIOACTIVITY 259Fm(SF) [from 248Cm(18O, X), E=95 MeV]; measured fission fragments. 258,259Fm, 260Md; deduced T1/2, total kinetic energy, uncertainty with the activity parent nuclide assignment, the most likely assignment is 259Fm.

doi: 10.1103/PhysRevC.24.495
Citations: PlumX Metrics

Data from this article have been entered in the EXFOR database. For more information, access X4 dataset14717.


1981LE23      Phys.Rev. C24, 2370 (1981)

M.E.Leino, S.Yashita, A.Ghiorso

Alpha Decay of Neutron Deficient Polonium and Bismuth Isotopes

RADIOACTIVITY 192,193,193m,194Po, 191mBi; measured T1/2, Eα. Gas filled on-line mass separator.

doi: 10.1103/PhysRevC.24.2370
Citations: PlumX Metrics


1981NI01      Nucl.Phys. A352, 138 (1981)

J.M.Nitschke, M.Fowler, A.Ghiorso, R.E.Leber, M.E.Leino, M.J.Nurmia, L.P.Somerville, K.E.Williams, E.K.Hulet, J.H.Landrum, R.W.Lougheed, J.F.Wild, C.E.Bemis, Jr., R.J.Silva, P.Eskola

Search for an 80 ms Spontaneous Fission Activity in Bombardments of 249Bk with 15N

NUCLEAR REACTIONS, Fission 249Bk(15N, X), E=78, 82, 86, 88, 100 MeV; measured σ(E), spontaneous fission T1/2. 260Rf deduced no evidence for 80 ms spontaneous fission decay.

doi: 10.1016/0375-9474(81)90564-9
Citations: PlumX Metrics


1980HO25      Phys.Rev. C22, 1581 (1980)

D.Hoffman, D.Lee, A.Ghiorso, M.Nurmia, K.Aleklett

Fragment Mass and Kinetic-Energy Distributions from Spontaneous Fission of the Neutron-Deficient Isotopes, 1.2-s 246Fm and 38-s 248Fm

RADIOACTIVITY, Fission 246,248Fm(SF); measured fragment mass, kinetic energy distributions.

doi: 10.1103/PhysRevC.22.1581
Citations: PlumX Metrics

Data from this article have been entered in the EXFOR database. For more information, access X4 dataset10925.


1979NI01      Nucl.Phys. A313, 236 (1979)

J.M.Nitschke, R.E.Leber, M.J.Nurmia, A.Ghiorso

Observations in the Reactions of Two Magic Nuclei: 208Pb and 48Ca

NUCLEAR REACTIONS 208Pb(48Ca, xn), 208Pb(40Ar, xn), E(cm)=160-200 MeV; measured σ(E), transfer reaction products; deduced angular momentum, tunneling effects.

doi: 10.1016/0375-9474(79)90578-5
Citations: PlumX Metrics


1978BA44      Phys.Rev.Lett. 41, 738 (1978)

P.A.Baisden, R.E.Leber, M.Nurmia, J.M.Nitschke, M.Michel, A.Ghiorso

Isomeric States in 212Bi

RADIOACTIVITY 212,212mBi; measured T1/2, Eα.

doi: 10.1103/PhysRevLett.41.738
Citations: PlumX Metrics


1978IL01      Phys.Lett. 78B, 209 (1978)

J.D.Illige, E.K.Hulet, J.M.Nitschke, R.J.Dougan, R.W.Lougheed, A.Ghiorso, J.H.Landrum

Search for Volatile Superheavy Elements from the Reaction 248Cm + 48Ca

NUCLEAR REACTIONS 248Cm(48Ca, X), E=267 MeV; measured σ for α-, SF-decay fragments; deduced no volatile superheavy elements with T1/2=1 sec-4.17 days.

doi: 10.1016/0370-2693(78)90007-2
Citations: PlumX Metrics


1978OT03      J.Inorg.Nucl.Chem. 40, 589 (1978)

R.J.Otto, D.J.Morrissey, D.Lee, A.Ghiorso, J.M.Nitschke, G.T.Seaborg, M.M.Fowler, R.J.Silva

A Search for Superheavy Elements with Half-Lives between a Few Minutes and Several Hundred Days, Produced in the 48Ca + 248Cm Reaction

NUCLEAR REACTIONS 248Cm(48Ca, X), E=255 MeV; measured SF activity; deduced no superheavy yield.

doi: 10.1016/0022-1902(78)80372-8
Citations: PlumX Metrics

Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2537.


1977HU04      Phys.Rev.Lett. 39, 385 (1977)

E.K.Hulet, R.W.Lougheed, J.F.Wild, J.H.Landrum, P.C.Stevenson, A.Ghiorso, J.M.Nitschke, R.J.Otto, D.J.Morrissey, P.A.Baisden, B.F.Gavin, D.Lee, R.J.Silva, M.M.Fowler, G.T.Seaborg

Search for Superheavy Elements in the Bombardment of 248Cm with 48Ca

NUCLEAR REACTIONS 248Cm(48Ca, X), E=267 MeV; measured σ for formation of superheavy elements.

doi: 10.1103/PhysRevLett.39.385
Citations: PlumX Metrics

Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2537.


1977OT01      Radiochim.Acta 24, 3 (1977)

R.J.Otto, A.Ghiorso, D.Lee, R.E.Leber, S.Yashita, G.T.Seaborg

Search of Superheavy Elements Produced in the 136Xe + 238U Reaction and an Upper Limit Cross Section for the Gd(136Xe, X)212Pb Reaction

NUCLEAR REACTIONS Gd(136Xe, X), E=1150 MeV; measured reaction products; deduced upper limit σ for production of 212Pb; 238U(136Xe, X), E=1150 MeV; measured reaction products; deduced spontaneous fission energy spectrum, lack of superheavy element production.

doi: 10.1524/ract.1977.24.1.3
Citations: PlumX Metrics

Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2534.


1974GH04      Phys.Rev.Lett. 33, 1490 (1974)

A.Ghiorso, J.M.Nitschke, J.R.Alonso, C.T.Alonso, M.Nurmia, G.T.Seaborg, E.K.Hulet, R.W.Lougheed

Element 106

NUCLEAR REACTIONS 249Cf(18O, X)263Sg, E=95 MeV; measured reaction products, Eα, Iα; deduced σ.

RADIOACTIVITY 263Sg(α); measured decay products, Eα, Iα; deduced T1/2.

doi: 10.1103/PhysRevLett.33.1490
Citations: PlumX Metrics

Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2532.


1973ES02      Phys.Fenn. 8, 357 (1973)

P.Eskola, K.Eskola, M.Nurmia, A.Ghiorso

Two New Isotopes of Einsteinium, 243Es and 244Es

RADIOACTIVITY 243,244Es; measured Eα, Iα, T1/2, estimated EC-branching ratios.

NUCLEAR REACTIONS 233U(15N, 3n), (15N, 4n), (15N, 5n), (15N, 3np), E=70-100 MeV; measured σ(E).


1973GH03      Phys.Rev. C7, 2032 (1973)

A.Ghiorso, K.Eskola, P.Eskola, M.Nurmia

Isomeric States in 250Fm and 254No

RADIOACTIVITY 250mFm, 254mNo; measured Eα, T1/2.

doi: 10.1103/PhysRevC.7.2032
Citations: PlumX Metrics


1973SI40      Nucl.Phys. A216, 97 (1973)

R.J.Silva, P.F.Dittner, M.L.Mallory, O.L.Keller, K.Eskola, P.Eskola, M.Nurmia, A.Ghiorso

The New Nuclide Nobelium-259

RADIOACTIVITY 259No; measured T1/2, Eα, Iα. Deduced α-hindrance.

NUCLEAR REACTIONS 248Cm(18O, 3nα), E=95, 80-110 MeV; measured σ(E), production σ for 259No.

doi: 10.1016/0375-9474(73)90520-4
Citations: PlumX Metrics

Data from this article have been entered in the EXFOR database. For more information, access X4 datasetB0004.


1972SE22      Proc.U.N.-I.A.E.A.Int.Conf.Peaceful Uses At.Energy, 4th, Geneva (1971), United Nations, New York, Intern.At.En.Agency, Vienna, Vol.7, p.487 (1972)

G.T.Seaborg, J.L.Crandall, P.R.Fields, A.Ghiorso, O.L.Keller, Jr., R.A.Penneman

Recent Advances in the United States of America on the Transuranium Elements


1971ES01      Phys.Rev. C4, 632 (1971)

K.Eskola, P.Eskola, M.Nurmia, A.Ghiorso

Studies of Lawrencium Isotopes with Mass Numbers 255 Through 260

RADIOACTIVITY 255,256,257,258,259,260Lr; measured T1/2, Eα, Iα; deduced α-hindrance factors.

doi: 10.1103/PhysRevC.4.632
Citations: PlumX Metrics


1971GH01      Phys.Rev. C4, 1850 (1971)

A.Ghiorso, M.Nurmia, K.Eskola, P.Eskola

Two New Alpha-Particle Emitting Isotopes of Element 105, 261Ha and 262Ha

RADIOACTIVITY 261,262Db; measured T1/2, Eα, Iα.

NUCLEAR REACTIONS 249Bk(18O, X), E=92-97 MeV; measured (16O)(fragment)-delay; deduced SF-isomer.

doi: 10.1103/PhysRevC.4.1850
Citations: PlumX Metrics


1971GH02      Inorg.Nucl.Chem.Lett. 7, 1117 (1971)

A.Ghiorso, M.Nurmia, K.Eskola, P.Eskola

Comments on 'Chemical Separation of Kurchatovium'

doi: 10.1016/0020-1650(71)80103-4
Citations: PlumX Metrics


1971GH03      Nature 229, 603 (1971)

A.Ghiorso, M.Nurmia, J.Harris, K.Eskola, P.Eskola

Defence of the Berkeley Work on Alpha-Emitting Isotopes of Element 104

NUCLEAR REACTIONS 249Cf(12C, 4n), E=74 MeV; 249Cf(11B, 3n); measured Eα, α(t). 250mFm, 254mNo, 257mLr, 257Rf deduced T1/2.

doi: 10.1038/229603a0
Citations: PlumX Metrics


1971HU03      Phys.Rev. Lett. 26, 523 (1971)

E.K.Hulet, J.F.Wild, R.W.Lougheed, J.E.Evans, B.J.Qualheim, M.Nurmia, A.Ghiorso

Spontaneous-Fission Half-Life of 258Fm and Nuclear Instability

RADIOACTIVITY, Fission 258Fm(SF)[from 257Fm(d, p)]; measured T1/2.

doi: 10.1103/PhysRevLett.26.523
Citations: PlumX Metrics


1970ES02      Phys.Rev. C2, 1058 (1970)

P.Eskola, K.Eskola, M.Nurmia, A.Ghiorso

Alpha Decay of 255No and 257No

RADIOACTIVITY 255,257No; measured Eα, Iα, T1/2; deduced hindrance factors.

NUCLEAR REACTIONS 249Cf(12C, αxn), E=60-110 MeV; 248Cm(12C, X), E=60-85 MeV; measured σ(E).

doi: 10.1103/PhysRevC.2.1058
Citations: PlumX Metrics


1970GH01      Phys.Lett. 32B, 95 (1970)

A.Ghiorso, M.Nurmia, K.Eskola, P.Eskola

261Rf; New Isotope of Element 104

RADIOACTIVITY 261Rf; measured Eα, T1/2.

doi: 10.1016/0370-2693(70)90595-2
Citations: PlumX Metrics


1970GH02      Phys.Rev.Lett. 24, 1498 (1970)

A.Ghiorso, M.Nurmia, K.Eskola, J.Harris, P.Eskola

New Element Hahnium, Atomic Number 105

RADIOACTIVITY 260Db[from 249Cf(15N, X)]; measured T1/2, Eα, Iα; deduced SF-branching.

NUCLEAR REACTIONS 249Cf(15N, X), E=75-110 MeV; measured σ(E).

doi: 10.1103/PhysRevLett.24.1498
Citations: PlumX Metrics


1970HU17      UCRL-72858 (1970)

E.K.Hulet, J.F.Wild, R.W.Lougheed, J.E.Evans, B.J.Qualheim, M.Nurmia, A.Ghiorso

Spontaneous-Fission Half-Life of 258Fm and Nuclear Instability


1970SI07      Phys.Rev. C1, 1564 (1970)

T.Sikkeland, R.J.Silva, A.Ghiorso, M.J.Nurmia

Study of Dy(40Ar, xn)Po Reactions

NUCLEAR REACTIONS Dy(40Ar, xn), E=160-280 MeV; measured σ(E) for 194,195,197,198,199,200Po production. 195,197,199Po deduced isomer ratios.

doi: 10.1103/PhysRevC.1.1564
Citations: PlumX Metrics


1969GH01      Phys.Rev.Letters 22, 1317 (1969)

A.Ghiorso, M.Nurmia, J.Harris, K.Eskola, P.Eskola

Positive Identification of Two Alpha-Particle-Emitting Isotopes of Element 104

RADIOACTIVITY 257Rf, 258Rf, 259Rf; measured T1/2, Eα, Iα.

doi: 10.1103/PhysRevLett.22.1317
Citations: PlumX Metrics


1968HU06      Bull.Am.Phys.Soc. 13, No.4, 604, DF7 (1968); Oral Report

E.K.Hulet, A.Ghiorso, R.W.Lougheed, J.E.Evans, J.D.Brady, R.W.Hoff, R.E.Stone, B.J.Qualheim

Discovery of 258Md

NUCLEAR STRUCTURE 258Md; measured not abstracted; deduced nuclear properties.


1968NU02      UCRL-17989, p.149 (1968)

M.Nurmia, T.Sikkeland, R.Silva, A.Ghiorso

Spontaneous Fission of Light Fermium Isotopes; New Nuclides 244Fm and 245Fm


1967GH01      Phys.Rev.Letters 18, 401 (1967)

A.Ghiorso, T.Sikkeland, M.J.Nurmia

Isotopes of Element 102 with Mass 251 to 258

NUCLEAR STRUCTURE 252No, 251No, 255No, 253No, 254No, 256No, 257No; measured not abstracted; deduced nuclear properties.

doi: 10.1103/PhysRevLett.18.401
Citations: PlumX Metrics


1967NU01      Phys.Letters 26B, 78 (1967)

M.Nurmia, T.Sikkeland, R.Silva, A.Ghiorso

Spontaneous Fission of Light Fermium Isotopes; New Nuclides 244Fm and 245Fm

doi: 10.1016/0370-2693(67)90552-7
Citations: PlumX Metrics


1967SI07      Phys.Letters 24B, 331 (1967)

T.Sikkeland, A.Ghiorso

New Californium Isotope, 242Cf

NUCLEAR STRUCTURE 242Cf; measured not abstracted; deduced nuclear properties.

doi: 10.1016/0370-2693(67)90235-3
Citations: PlumX Metrics


1967SI08      Phys.Lett. 24B, 333 (1967)

T.Sikkeland, A.Ghiorso, J.Maly, M.J.Nurmia

Decay Properties of the New Isotope 243Cf and of 244Cf

NUCLEAR STRUCTURE 243Cf, 244Cf; measured not abstracted; deduced nuclear properties.

doi: 10.1016/0370-2693(67)90236-5
Citations: PlumX Metrics


1966HO01      Phys.Rev. 148, 1192 (1966); See keynumber 1966RG01

R.W.Hoff, C.P.Bailey, G.W.Barton, G.H.Coleman, M.S.Coops, J.E.Evans, B.A.Hannon, W.N.Hayes, R.A.Heckman, E.K.Hulet, R.W.Lougheed, R.J.Morrow, R.S.Newbury, B.J.Qualheim, R.Quong, E.H.Stearns, H.D.Wilson, J.P.Balagna, J.W.Barnes, G.A.Cowan, W.R.Daniels, B.J.Dropesky, G.P.Ford, J.S.Gilmore, S.B.Helmick, D.C.Hoffman, J.D.Knight, G.W.Knobeloch, C.J.Orth, T.T.Shull, H.L.Smith, W.G.Warren, K.Wolfsberg, F.Asaro, J.Burnett, B.B.Cunningham, S.M.Fried, J.T.Haley, A.Ghiorso, J.Green, R.Latimer, F.T.McCarthy, H.V.Michel, M.C.Michel, D.F.Mosier, T.C.Parsons, I.Perlman, J.E.Rees, J.C.Wallmann, R.F.Barnes, L.J.Basile, H.Diamond, P.R.Fields, A.M.Friedman, E.P.Horowitz, J.K.Lerner, D.N.Metta, J.Milsted, R.K.Sjoblom, C.M.Stevens

Nuclear Decay Properties of Heavy Nuclides Produced in Thermonuclear Explosions - Par and Barbel Events

RADIOACTIVITY 251,252,253,254Cf, 255Es, 257,258Fm(α), 250Cm(SF), 251Bk, 252Cm(β-) [from U(n, F), U(n, X), E ∼ 2 MeV]; measured decay products, Eα, Iα; deduced α-particles energies, α-decay branchings, T1/2. Two low-yield thermonuclear explosions, the Par and Barbel events, chemical separation of products.

NUCLEAR REACTIONS Cm(n, X)249Cf/250Cf/252Cf/252Cf/253Cf/254Cf/253Es/254Es/255Es, E thermal; measured reaction products, Eα, Iα, Eβ, Iβ; deduced isotopic abundances. Cm irradions, reactor.

doi: 10.1103/PhysRev.148.1192
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1965SI14      Phys.Rev. 140, B277 (1965)

T.Sikkeland, A.Ghiorso, R.Latimer, A.E.Larsh

Decay Properties of the Nuclides Fermium-256 and -257 and Mendelevium-255, -256, and -257

NUCLEAR STRUCTURE 256Md, 256Fm, 257Md, 257Fm, 255Md; measured not abstracted; deduced nuclear properties.

doi: 10.1103/PhysRev.140.B277
Citations: PlumX Metrics


1962PE15      Phys.Rev. 127, 917 (1962)

I.Perlman, F.Asaro, A.Ghiorso, A.Larsh, R.Latimer

Isomeric State of Po212

NUCLEAR STRUCTURE 212Po; measured not abstracted; deduced nuclear properties.

doi: 10.1103/PhysRev.127.917
Citations: PlumX Metrics


1961GH03      Phys.Rev.Letters 6, 473 (1961)

A.Ghiorso, T.Sikkeland, A.E.Larsh, R.M.Latimer

New Element, Lawrencium, Atomic Number 103

NUCLEAR STRUCTURE 257Lr, 255No; measured not abstracted; deduced nuclear properties.

doi: 10.1103/PhysRevLett.6.473
Citations: PlumX Metrics


1960DI03      Phys.Rev. 119, 2000 (1960)

H.Diamond, P.R.Fields, C.S.Stevens, M.H.Studier, S.M.Fried, M.G.Inghram, D.C.Hess, G.L.Pyle, J.F.Mech, W.M.Manning, A.Ghiorso, S.G.Thompson, G.H.Higgins, G.T.Seaborg, C.I.Browne, H.L.Smith, and R.W.Spence

Heavy Isotope Abundances in Mike Thermonuclear Device

NUCLEAR REACTIONS 235,238U(n, γ)239U/240U/241U/242U/243U/244U/245U/246U/247U/248U/249U/250U/251U/252U/253U/254U/255U, E fast; measured reaction products mass spectrometrically and radiometrically; deduced isotopic abundances.

doi: 10.1103/PhysRev.119.2000
Citations: PlumX Metrics


1959GH17      UCRL-8714 (1959)

A.Ghiorso

Techniques Used for the Production and Identification of the Transplutonium Elements


1958GH39      Phys.Rev.Letters 1, 17 (1958)

A.Ghiorso, T.Sikkeland, J.R.Walton, G.T.Seaborg

Attempts to Confirm the Existence of the 10-Minute Isotope of 102

doi: 10.1103/PhysRevLett.1.17
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1958GH40      Phys.Rev.Letters 1, 18 (1958)

A.Ghiorso, T.Sikkeland, J.R.Walton, G.T.Seaborg

Element 102

doi: 10.1103/PhysRevLett.1.18
Citations: PlumX Metrics

Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2529.


1957AM47      Phys.Rev. 106, 553 (1957)

S.Amiel, A.Chetham-Strode, Jr., G.R.Choppin, A.Ghiorso, B.G.Harvey, L.W.Holm, S.G.Thompson

Production and Properties of the Nuclides Fermium-250, 251, and 252

doi: 10.1103/PhysRev.106.553
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1956FI11      Phys.Rev. 102, 180 (1956)

P.R.Fields, M.H.Studier, H.Diamond, J.F.Mech, M.G.Inghram, G.L.Pyle, C.M.Stevens, S.Fried, W.M.Manning, A.Ghiorso, S.G.Thompson, G.H.Higgins, G.T.Seaborg

Transplutonium Elements in Thermonuclear Test Debris

doi: 10.1103/PhysRev.102.180
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Data from this article have been entered in the EXFOR database. For more information, access X4 dataset14655.


1956HA80      Phys.Rev. 104, 1315 (1956)

B.G.Harvey, A.Chetham-Strode, A.Ghiorso, G.R.Choppin, S.G.Thompson

New Isotopes of Einsteinium

doi: 10.1103/PhysRev.104.1315
Citations: PlumX Metrics

Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2319.


1955CH30      Phys.Rev. 98, 1519 (1955)

G.R.Choppin, B.G.Harvey, S.G.Thompson, A.Ghiorso

Nuclear Properties of 100256

doi: 10.1103/PhysRev.98.1519
Citations: PlumX Metrics


1955GH01      Phys.Rev. 99, 1048 (1955)

A.Ghiorso, S.G.Thompson, G.H.Higgins, G.T.Seaborg, M.H.Studier, P.R.Fields, S.M.Fried, H.Diamond, J.F.Mech, G.L.Pyle, J.R.Huizenga, A.Hirsch, W.M.Manning, C.I.Browne, H.L.Smith, R.W.Spence

New Elements Einsteinium and Fermium, Atomic Numbers 99 and 100

RADIOACTIVITY 253Cf, 255Es(β-); measured decay products, Eα, Iα; deduced T1/2, element names.

doi: 10..1103/PhysRev.99.1048
Citations: PlumX Metrics


1955GH02      Phys.Rev. 98, 1518 (1955)

A.Ghiorso, B.G.Harvey, G.R.Choppin, S.G.Thompson, G.T.Seaborg

New Element Mendelevium, Atomic Number 101

NUCLEAR REACTIONS 253Es(He, X)256Md, E=48 MeV; measured reaction products, Eα, Iα; deduced a new Z=101 element in recognition of the pioneering role of the great Russian chemist, Dmitri Mendeleev, who was the first to use the periodic system of the elements to predict the chemical properties of undiscovered elements, a principle which has been the key to the discovery of the last seven transuranium (actinide) elements.

RADIOACTIVITY 256Md(α); measured decay products, Eα, Iα; deduced T1/2.

doi: 10.2172/914464
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1955HA35      Phys.Rev. 99, 337 (1955)

B.G.Harvey, S.G.Thompson, G.R.Choppin, A.Ghiorso

Nuclide 99254

doi: 10.1103/PhysRev.99.337
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1954CH23      Phys.Rev. 94, 1080 (1954)

G.R.Choppin, S.G.Thompson, A.Ghiorso, B.G.Harvey

Nuclear Properties of Some Isotopes of Californium, Elements 99 and 100

doi: 10.1103/PhysRev.94.1080
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1954GH12      Phys.Rev. 93, 257 (1954)

A.Ghiorso, G.B.Rossi, B.G.Harvey, S.G.Thompson

Reactions of U238 with Cyclotron-Produced Nitrogen Ions

doi: 10.1103/PhysRev.93.257
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1954GH24      Phys.Rev. 94 1081 (1954)

A.Ghiorso, S.G.Thompson, G.R.Choppin, B.G.Harvey

New Isotopes of Americium, Berkelium and Californium

doi: 10.1103/PhysRev.94.1081
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1954GH25      Phys.Rev. 95, 293 (1954)

A.Ghiorso, S.G.Thompson, G.H.Higgins, B.G.Harvey, G.T.Seaborg

Evidence for Subshell at N = 152

RADIOACTIVITY 244,246,248,249,250,252Cf, Pu, Am, Cm, Bk, Es, Fm(α); analyzed available data; deduced α-particle energy vs. mass number systematics, N=152 subshell.

doi: 10.1103/PhysRev.95.293
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1954HA69      Phys.Rev. 95, 581 (1954)

B.G.Harvey, H.P.Robinson, S.G.Thompson, A.Ghiorso, G.R.Choppin

Some pile neutron cross sections of isotopes of americium, berkelium, californium, and element 99

NUCLEAR REACTIONS 243Am(n, γ), 249Bk, 249Cf(n, X), 249Cf(n, f), 249Cf(n, γ), 252Cf(n, γ), 254Cf(n, γ), 253Es(n, γ), 254Es(n, γ), E=0.0253 eV; measured products, 244Am, Eγ, Iγ; deduced σ, σ(E). Data were imported from EXFOR entry 12567.

doi: 10.1103/PhysRev.95.581
Citations: PlumX Metrics

Data from this article have been entered in the EXFOR database. For more information, access X4 dataset12567.


1954HA73      Phys.Rev. 93, 1129 (1954)

B.G.Harvey, S.G.Thompson, A.Ghiorso, G.R.Choppin

Further Production of Transcurium Nuclides by Neutron Irradiation

RADIOACTIVITY 254Es, 253Cf(β-) [from 252Cf, 254Es(n, γ), E thermal]; measured decay products. 254Fm; deduced element 100. The Materials Testing Reactor (MTR).

doi: 10.1103/PhysRev.93.1129
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1954HU50      Phys.Rev. 95, 1703 (1954)

E.K.Hulet, S.G.Thompson, A.Ghiorso

Isotopes of Curium, Berkelium, and Californium

doi: 10.1103/PhysRev.95.1703
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1954HU58      Phys.Rev. 95, 1703 (1954)

E.K.Hulet, S.G.Thompson, A.Ghiorso

Isotopes of Curium, Berkelium, and Californium

doi: 10.1103/PhysRev.95.1703
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1954TH01      Phys.Rev. 93, 908 (1954)

S.G.Thompson, A.Ghiorso, B.G.Harvey, G.R.Choppin

Transcurium Isotopes Produced in the Neutron Irradiation of Plutonium

doi: 10.1103/PhysRev.93.908
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1953EL13      Phys.Rev. 89, 320 (1953)

R.Elson, W.Bentley, A.Ghiorso, Q.Van Winkle

The Thermal Neutron Fission And Capture Cross Sections Of U232

NUCLEAR REACTIONS 232U(n, f), 232U(n, γ), E=0.0253 eV; measured products, 233U, Eγ, Iγ; deduced σ, σ(E). Data were imported from EXFOR entry 12387.

doi: 10.1103/PhysRev.89.320
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Data from this article have been entered in the EXFOR database. For more information, access X4 dataset12387.


1953FR17      Phys.Rev. 91, 498A (1953)

G.Friedlander, E.Wilson, A.Ghiorso, I.Perlman

Genetic Relationships of the 0.8-Second Pb207m Isomer

doi: 10.1103/PhysRev.91.498A
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1953HU85      Phys.Rev. 89, 878 (1953)

E.K.Hulet, S.G.Thompson, A.Ghiorso

Spontaneous Fission Rate of Cf246

doi: 10.1103/PhysRev.89.878
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1953HY83      Phys.Rev. 90, 267 (1953)

E.K.Hyde, A.Ghiorso

The Alpha-Branching of AcK and the Presence of Astatine in Nature

doi: 10.1103/PhysRev.90.267
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1953RA02      Phys.Rev. 89, 33 (1953)

J.O.Rasmussen, Jr., S.G.Thompson, A.Ghiorso

Alpha-Radioactivity in the 82-Neutron Region

doi: 10.1103/PhysRev.89.33
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1952FL20      Phys.Rev. 88, 642 (1952)

E.H.Fleming, Jr., A.Ghiorso, B.B.Cunningham

The Specific Alpha Activity and Half-Lives of U234, U235, and U236

doi: 10.1103/PhysRev.88.642
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1952GH27      Phys.Rev. 87, 163 (1952)

A.Ghiorso, G.H.Higgins, A.E.Larsh, G.T.Seaborg, S.G.Thompson

Spontaneous Fission of U234, Pu236, Cm240, and Cm244

doi: 10.1103/PhysRev.87.163
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1952JA01      Phys.Rev. 85, 369 (1952)

R.A.James, A.Ghiorso, D.Orth

L Electron Capture and Alpha Decay in Np235

doi: 10.1103/PhysRev.85.369
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1952ME13      Phys.Rev. 85, 429 (1952)

W.W.Meinke, A.Ghiorso, G.T.Seaborg

Further Work on Heavy Collateral Radioactive Chains

doi: 10.1103/PhysRev.85.429
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1952MO23      Phys.Rev. 86, 805 (1952)

F.F.Momyer, E.K.Hyde, A.Ghiorso, W.E.Glenn

Recent Studies of the Isotopes of Emanation, Francium, and Radium

doi: 10.1103/PhysRev.86.805
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1952ST70      Phys.Rev. 85, 135 (1952)

K.Street Jr, A.Ghiorso, S.G.Thompson

Slow Neutron Fission of Am242, Am242m, and Am243

NUCLEAR REACTIONS 241Am(n, γ), 242Am(n, f), 242Am(n, X), 242Am(n, γ), 243Am(n, f), E=0.0253 eV; measured products, 242Am, Eγ, Iγ; deduced σ, σ(E). Data were imported from EXFOR entry 12583.

doi: 10.1103/PhysRev.85.135.2
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Data from this article have been entered in the EXFOR database. For more information, access X4 dataset12583.


1951BA14      Phys.Rev. 82, 13 (1951)

G.W.Barton, Jr., A.Ghiorso, I.Perlman

Radioactivity of Astatine Isotopes

doi: 10.1103/PhysRev.82.13
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1951GH21      Phys.Rev. 82, 558 (1951)

A.Ghiorso, J.W.Brittain, W.M.Manning, G.T.Seaborg

The Uranium Isotope U236

doi: 10.1103/PhysRev.82.558
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1951GH22      Phys.Rev. 82, 979 (1951)

A.Ghiorso

Complex Alpha-Spectrum of U235

doi: 10.1103/PhysRev.82.979
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1951GH23      Phys.Rev. 81, 154 (1951)

A.Ghiorso, S.G.Thompson, K.Street, Jr., G.T.Seaborg

Californium Isotopes from Bombardment of Uranium with Carbon Ions

NUCLEAR REACTIONS 238U(12C, 6n)244Cf, 238U(12C, 4n)246Cf, E not given; measured reaction products, Eα, Iα; deduced α-particles energies, T1/2, evidence for element Z=98 isotopes. Comparison with theoretical calculations.

doi: 10.1103/PhysRev.81.154
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1951HU39      Phys.Rev. 84, 366 (1951)

E.K.Hulet, S.G.Thompson, A.Ghiorso, K.Street, Jr.

New Isotopes of Berkelium and Californium

RADIOACTIVITY 243,245Bk(EC), (α), 243,245Cm, 246Cf(α) [from 242,243,244Cm(d, X), E=16 MeV; 242,243,244Cm(3He, X), E=35 MeV]; measured decay products, Eβ, Iβ, Eα, Iα; deduced new isotopes T1/2. Comparison with available data. The pile facilities of the Atomic Energy Project, National Research Council of Canada, Chalk River, Ontario, Canada. The 60-inch cyclotron of the Crocker Laboratory.

doi: 10.1103/PhysRev.84.366.2
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1951KA37      Phys.Rev. 83, 390 (1951)

D.G.Karraker, A.Ghiorso, D.H.Templeton

Alpha-Decay Energies of Polonium Isotopes

RADIOACTIVITY 200,201Po(α), (EC), 206,207,208,209Po(α), 226Ra(α) [from 209Bi(p, X), E=100 MeV]; measured decay products, Eα, Iα; deduced α-particles energies, T1/2. Comparison with available data. Berkeley 184-inch and 60-inch cyclotrons.

doi: 10.1103/PhysRev.83.390
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1951ME10      Phys.Rev. 81, 782 (1951)

W.W.Meinke, A.Ghiorso, G.T.Seaborg

Artificial Chains Collateral to the Heavy Radioactive Families

doi: 10.1103/PhysRev.81.782
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1951TH20      Phys.Rev. 84, 165 (1951)

S.G.Thompson, K.Street, Jr., A.Ghiorso, F.L.Reynolds

Properties of the Isotope Pu243

doi: 10.1103/PhysRev.84.165
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1950GH63      Phys.Rev. 78, 472 (1950)

A.Ghiorso, R.A.James, L.O.Morgan, G.T.Seaborg

Preparation of Transplutonium Isotopes by Neutron Irradiation

RADIOACTIVITY 241Pu(β-) [from 238U(α, n), E=40 MeV; 239,240Pu(n, γ), E thermal]; measured decay products; deduced americium production routes.

doi: 10.1103/PhysRev.78.472
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1950HA52      Phys.Rev. 79, 435 (1950)

F.Hagemann, L.I.Katzin, M.H.Studier, G.T.Seaborg, A.Ghiorso

The 4n + 1 Radioactive Series: The Decay Products of U233

doi: 10.1103/PhysRev.79.435
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1950HY20      UCRL-593 (1950)

E.K.Hyde, A.Ghiorso

Preparation of a New Isotope of Fr222


1950HY27      Phys.Rev. 77, 765 (1950)

E.K.Hyde, A.Ghiorso, G.T.Seaborg

Low Mass Francium and Emanation Isotopes of High Alpha-Stability

doi: 10.1103/PhysRev.77.765
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1950LE15      Phys.Rev. 77, 296 (1950)

C.A.Levine, A.Ghiorso, G.T.Seaborg

Half-Life for Double Beta-Decay

RADIOACTIVITY 238U(2β-); measured decay products, Eα, Iα; deduced T1/2 limit. Radiochemical methods.

doi: 10.1103/PhysRev.77.296
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1950PE99      Phys.Rev. 77, 26 (1950)

I.Perlman, A.Ghiorso, G.T.Seaborg

Systematics of Alpha-Radioactivity

doi: 10.1103/PhysRev.77.26
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1950RA56      Phys.Rev. 80, 475 (1950)

J.O.Rasmussen, F.L.Reynolds, S.G.Thompson, A.Ghiorso

Mass Assignments of Alpha-Active Isotopes in the Rare Earth Region

doi: 10.1103/PhysRev.80.475
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1950ST61      Phys.Rev. 79, 530 (1950)

K.Street, Jr., A.Ghiorso, G.T.Seaborg

The Isotopes of Americium

doi: 10.1103/PhysRev.79.530
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Data from this article have been entered in the EXFOR database. For more information, access X4 dataset12581.


1950TH52      Phys.Rev. 80, 781 (1950)

S.G.Thompson, A.Ghiorso, G.T.Seaborg

The New Element Berkelium (Atomic Number 97)

doi: 10.1103/PhysRev.80.781
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2527.


1950TH54      Phys.Rev. 80, 1108 (1950)

S.G.Thompson, K.Street, Jr., A.Ghiorso, F.L.Reynolds

The New Isotope Pu242 and Additional Information on Other Plutonium Isotopes

doi: 10.1103/PhysRev.80.1108
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1950TH55      Phys.Rev. 77, 838 (1950)

S.G.Thompson, A.Ghiorso, G.T.Seaborg

Element 97

NUCLEAR REACTIONS 241Am(α, X)243Bk/244Bk, E not given; measured reaction products, Eα, Iα; deduced α-particles energies, evidence for element Z=97.

doi: 10.1103/PhysRev.77.838.2
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1950TH56      Phys.Rev. 78, 298 (1950)

S.G.Thompson, K.Street, Jr., A.Ghiorso, G.T.Seaborg

Element 98

NUCLEAR REACTIONS 242Cm(α, X)244Cf, E=35 MeV; measured reaction products, Eα, Iα; deduced α-particles energies, evidence for element Z=98.

doi: 10.1103/PhysRev.78.298.2
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1950TH57      Phys.Rev. 80, 790 (1950)

S.G.Thompson, K.Street, Jr., A.Ghiorso, G.T.Seaborg

The New Element Californium (Atomic Number 98)

NUCLEAR REACTIONS 242Cm(α, X)244Cf, E=35 MeV; measured reaction products, Eα, Iα; deduced α-particles energies, T1/2, evidence for element Z=98.

doi: 10.1103/PhysRev.80.790
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1949GH16      Phys.Rev. 76, 1414 (1949)

A.Ghiorso, W.W.Meinke, G.T.Seaborg

New Low Mass Isotopes of Emanation (Element 86)

doi: 10.1103/PhysRev.76.1414
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1949HY01      The Transuranium Elements: Research Papers, Book 2, Vol.14B, paper 19.17, G.T.Seaborg ed., p.1439 (1949)

E.K.Hyde, M.H.Studier, H.H.Hopkins, Jr., A.Ghiorso

A New Isotope of Protactinium: Pa229


1949HY04      The Transuranium Elements: Research Papers, Book 2, Vol.14B, paper 22.15, G.T.Seaborg ed., p.1622 (1949)

E.K.Hyde, M.H.Studier, A.Ghiorso

Products of the Deuteron and Helium-Ion Bombardments of U233


1949JA01      The Transuranium Elements: Research Papers, Book 2, Vol.14B, paper 22.8, G.T.Seaborg ed., p.1604 (1949)

R.A.James, A.E.Florin, H.H.Hopkins, Jr., A.Ghiorso

Products of Helium-Ion and Deuteron Bombardment of U235 and U238


1949ME54      Phys.Rev. 75, 314 (1949)

W.W.Meinke, A.Ghiorso, G.T.Seaborg

Three Additional Collateral Alpha-Decay Chains

RADIOACTIVITY 229U, 225Th, 221Ra, 217Rn, 213Po(α), 209Pb(β-), 228U, 224Th, 220Ra, 216Rn, 212Po(α), 226Pa, 222Ac, 218Fr, 214At(α), 210Bi(β-), 210Po(α), 228Pa, 224Ac, 220Fr, 216At, 212Bi(α), 212Bi, 208Tl(β-), 212Po(α), 227Pa, 223Ac, 219Fr, 215At, 211Bi(α), 211Bi, 207Tl(β-); measured decay products, Eα, Iα; deduced Q-values, T1/2.

doi: 10.1103/PhysRev.75.314
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