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338 results on '"K. Sümmerer"'

301. Determination of the partial electron capture- and spontaneous-fission half-lives of254No

Author

S. Hofmann, W. Brüchle, Matthias Schädel, G. Münzenberg, Jens Volker Kratz, Andreas Türler, D.T. Jost, U. W. Scherer, P. Armbruster, V. Ninov, K. Sümmerer, F. P. Heßberger, H. Folger, and Heinz W. Gäggeler

Subjects
Physics, Nuclear and High Energy Physics, Fusion, Filter (video), Electron capture, Nuclear fusion, Atomic physics, Spontaneous fission
Abstract

The isotope254No was produced in the fusion reaction48Ca +208Pb. Using the velocity filter SHIP and radiochemical techniques it was found that the nuclide254No with a half-life of 55 s decays byα, EC, and spontaneous-fission. Deduced partial half-lives are (61±2) s forα-decay, (550−160+370) s for EC and [2.2−1.0+2.0]×104 s for spontaneous fission.

Published
1988

302. New results on element 109

Author

K. Poppensieker, V. Ninov, H. J. Schött, E. Hanelt, M. Leino, K. Sümmerer, Dieter Ackermann, H. Folger, A. B. Quint, S. Hofmann, P. Armbruster, W. Reisdorf, Y. Fujita, W. Morawek, G. Münzenberg, F. P. Heßberger, Andreas Türler, Th. Schwab, and U. Gollerthan

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Nuclear engineering, 0103 physical sciences, Nuclear fusion, Element (category theory), 010306 general physics, 01 natural sciences
Published
1988

303. The new nuclide225U

Author

G. Münzenberg, W. Brüchle, P. Armbruster, M. Leino, Heinz W. Gäggeler, H. Folger, K. Sümmerer, Dieter Ackermann, Andreas Türler, D.T. Jost, J. V. Kratz, S. Hofmann, V. Ninov, M. Schädel, F. P. Heßberger, and U. W. Scherer

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Projectile, Filter (video), 0103 physical sciences, Nuclear fusion, Nuclide, 010306 general physics, 7. Clean energy, 01 natural sciences, Beam energy
Abstract

In the bombardment of a 270μg/cm 2 180Hf target with48 Ca projectiles at a primary beam energy of E/A=4.24 MeV/u the new nuclide225U was produced. The experiment was performed at the velocity filter SHIP. 225U was found to decay by α emission with Eα=(7880 ±20) keV (≈90%), (7830±20) keV (≈10%) and has a half-life ofT 1/2=(80 −20 +40 ms).

Published
1989

305. Evidence for264108, the heaviest known even-even isotope

Author

K. Sümmerer, F. P. He berger, U. Gollerthan, G. Berthes, B. Quint, G. Münzenberg, Stefan G. Hofmann, M. Leino, K.-H. Schmidt, H. J. Schött, K. Poppensieker, H. Folger, P. Armbruster, E. Hanelt, W. Reisdorf, and I. Zychor

Subjects
Physics, Nuclear and High Energy Physics, Mass excess, Isotope, 010308 nuclear & particles physics, Extrapolation, Shell (structure), 01 natural sciences, Lower limit, Nuclear physics, 0103 physical sciences, Atom, Nuclear fusion, Atomic physics, 010306 general physics
Abstract

We have observed the decay of one atom of the doubly even isotope 108. We observed α-decay with a halflife, of (76 −36 +364 ) Μs. The full α-decay energy could not be measured, as the α escaped the detector. With the knowledge of the halflife, an estimate on the α-decay energy can be made. From the formula of Rasmussen9 and a reduced α-width of 1, a value which has been measured for260106 and also for the doubly even isotones of N=156, we obtain Q=(11.0 −0.3 +0.1 MeV. This value is higher than given by Moeller10 (10.35 MeV), and agrees with that of Uran and Zeldes11 (10.9 MeV). A hindrance factor wα of 0.5 increases the Qα-value by 0.14 MeV. The mass excess of264108 follows as (120.0±0.3) MeV. The groundstate shell effect amounts to (−5.0±0.3) MeV using the macroscopic mass values of Ref. 10. The formation cross section of (3.2 −2.6 +6.1 ) pb overlaps with the value of ∼ 5 pb from Dubna for the 6 ms sf-activity mentioned initially but is considerably lower than an extrapolation from the reaction58Fe (208Pb,n)265108 which gave 10 pb with the lower limit of 4 pb.

Published
1986

306. Very neutron-rich isotopes of Z=3, 2, 1, 0

Author

Normand, G., Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), D. Guillemaud-Mueller, N. Alamanos, B. Blank, K. Sümmerer, M. Lewitowicz, S. Gales, O. Naviliat-Cuncic, H. Flocard, E. Balanzat, C. Volpe, G. Duchêne, N. Redon, G. de France, D. Guinet, D. Goutte, Guesnon, Sandrine, and D. Guillemaud-Mueller,N. Alamanos,B. Blank,K. Sümmerer,M. Lewitowicz,S. Gales,O. Naviliat-Cuncic,H. Flocard,E. Balanzat,C. Volpe,G. Duchêne,N. Redon,G. de France,D. Guinet,D. Goutte

Subjects
[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published
2004

307. A new trapping facility at LIRAT/SPIRAL/GANIL low energy area

Author

Darius, G., Mery, A., Herbane, M., Rodriguez, D., Ban, G., Delahaye, P., Durand, D., Fléchard, X., Labalme, M., Liénard, E., Mauger, F., Naviliat-Cuncic, O., Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), D. Guillemaud-Mueller, N. Alamanos, B. Blank, K. Sümmerer, M. Lewitowicz, S. Gales, O. Naviliat-Cuncic, H. Flocard, E. Balanzat, C. Volpe, G. Duchêne, N. Redon, G. de France, D. Guinet, D. Goutte, Guesnon, Sandrine, and D. Guillemaud-Mueller,N. Alamanos,B. Blank,K. Sümmerer,M. Lewitowicz,S. Gales,O. Naviliat-Cuncic,H. Flocard,E. Balanzat,C. Volpe,G. Duchêne,N. Redon,G. de France,D. Guinet,D. Goutte

Subjects
[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published
2004

308. Phenomenology of nucleon-nucleus and nucleus-nucleus reactions around the Fermi energy

Author

Denis Lacroix, Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), D. Guillemaud-Mueller, N. Alamanos, B. Blank, K. Sümmerer, M. Lewitowicz, S. Gales, O. Naviliat-Cuncic, H. Flocard, E. Balanzat, C. Volpe, G. Duchêne, N. Redon, G. de France, D. Guinet, D. Goutte, Guesnon, Sandrine, D. Guillemaud-Mueller,N. Alamanos,B. Blank,K. Sümmerer,M. Lewitowicz,S. Gales,O. Naviliat-Cuncic,H. Flocard,E. Balanzat,C. Volpe,G. Duchêne,N. Redon,G. de France,D. Guinet,D. Goutte, and Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
[PHYS.NUCL] Physics [physics]/Nuclear Theory [nucl-th], [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th]

309. First observation of the unbound nucleus 15Ne.

Author

Wamers F, Marganiec J, Aksouh F, Aksyutina Y, Álvarez-Pol H, Aumann T, Beceiro-Novo S, Boretzky K, Borge MJ, Chartier M, Chatillon A, Chulkov LV, Cortina-Gil D, Emling H, Ershova O, Fraile LM, Fynbo HO, Galaviz D, Geissel H, Heil M, Hoffmann DH, Johansson HT, Jonson B, Karagiannis C, Kiselev OA, Kratz JV, Kulessa R, Kurz N, Langer C, Lantz M, Le Bleis T, Lemmon R, Litvinov YA, Mahata K, Müntz C, Nilsson T, Nociforo C, Nyman G, Ott W, Panin V, Paschalis S, Perea A, Plag R, Reifarth R, Richter A, Rodriguez-Tajes C, Rossi D, Riisager K, Savran D, Schrieder G, Simon H, Stroth J, Sümmerer K, Tengblad O, Weick H, Wimmer C, and Zhukov MV

Abstract

We report on the first observation of the unbound proton-rich nucleus 15Ne. Its ground state and first excited state were populated in two-neutron knockout reactions from a beam of 500 MeV/u 17Ne. The 15Ne ground state is found to be unbound by 2.522(66) MeV. The decay proceeds directly to 13O with simultaneous two-proton emission. No evidence for sequential decay via the energetically allowed 2- and 1- states in 14F is observed. The 15Ne ground state is shown to have a strong configuration with two protons in the (sd) shell around 13O with a 63(5)% (1s1/2)2 component.

Published
2014
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310. Measurement of the dipole polarizability of the unstable neutron-rich nucleus 68Ni.

Author

Rossi DM, Adrich P, Aksouh F, Alvarez-Pol H, Aumann T, Benlliure J, Böhmer M, Boretzky K, Casarejos E, Chartier M, Chatillon A, Cortina-Gil D, Datta Pramanik U, Emling H, Ershova O, Fernandez-Dominguez B, Geissel H, Gorska M, Heil M, Johansson HT, Junghans A, Kelic-Heil A, Kiselev O, Klimkiewicz A, Kratz JV, Krücken R, Kurz N, Labiche M, Le Bleis T, Lemmon R, Litvinov YA, Mahata K, Maierbeck P, Movsesyan A, Nilsson T, Nociforo C, Palit R, Paschalis S, Plag R, Reifarth R, Savran D, Scheit H, Simon H, Sümmerer K, Wagner A, Waluś W, Weick H, and Winkler M

Abstract

The E1 strength distribution in 68Ni has been investigated using Coulomb excitation in inverse kinematics at the R3B-LAND setup and by measuring the invariant mass in the one- and two-neutron decay channels. The giant dipole resonance and a low-lying peak (pygmy dipole resonance) have been observed at 17.1(2) and 9.55(17) MeV, respectively. The measured dipole polarizability is compared to relativistic random phase approximation calculations yielding a neutron-skin thickness of 0.17(2) fm. A method and analysis applicable to neutron-rich nuclei has been developed, allowing for a precise determination of neutron skins in nuclei as a function of neutron excess.

Published
2013
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311. Study of the 14Be continuum: identification and structure of its second 2+ state.

Author

Aksyutina Y, Aumann T, Boretzky K, Borge MJ, Caesar C, Chatillon A, Chulkov LV, Cortina-Gil D, Datta Pramanik U, Emling H, Fynbo HO, Geissel H, Heinz A, Ickert G, Johansson HT, Jonson B, Kulessa R, Langer C, LeBleis T, Mahata K, Münzenberg G, Nilsson T, Nyman G, Palit R, Paschalis S, Prokopowicz W, Reifarth R, Rossi D, Richter A, Riisager K, Schrieder G, Simon H, Sümmerer K, Tengblad O, Thies R, Weick H, and Zhukov MV

Abstract

The coupling between bound quantum states and those in the continuum is of high theoretical interest. Experimental studies of bound drip-line nuclei provide ideal testing grounds for such investigations since they, due to the feeble binding energy of their valence particles, are easy to excite into the continuum. In this Letter, continuum states in the heaviest particle-stable Be isotope, 14Be, are studied by employing the method of inelastic proton scattering in inverse kinematics. New continuum states are found at excitation energies E*=3.54(16)  MeV and E*=5.25(19)  MeV. The structure of the earlier known 2(1)+ state at 1.54(13) MeV was confirmed with a predominantly (0d5/2)2 configuration while there is very clear evidence that the 2(2)+ state has a predominant (1s1/2, 0d5/2) structure with a preferential three-body decay mechanism. The region at about 7 MeV excitation shows distinct features of sequential neutron decay via intermediate states in 13Be. This demonstrates that the increasing availability of energetic beams of exotic nuclei opens up new vistas for experiments leading towards a new understanding of the interplay between bound and continuum states.

Published
2013
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312. Isotopic dependence of the nuclear caloric curve.

Author

Sfienti C, Adrich P, Aumann T, Bacri CO, Barczyk T, Bassini R, Bianchin S, Boiano C, Botvina AS, Boudard A, Brzychczyk J, Chbihi A, Cibor J, Czech B, De Napoli M, Ducret JE, Emling H, Frankland JD, Hellström M, Henzlova D, Immè G, Iori I, Johansson H, Kezzar K, Lafriakh A, Le Fèvre A, Le Gentil E, Leifels Y, Lühning J, Lukasik J, Lynch WG, Lynen U, Majka Z, Mocko M, Müller WF, Mykulyak A, Orth H, Otte AN, Palit R, Pawłowski P, Pullia A, Raciti G, Rapisarda E, Sann H, Schwarz C, Simon H, Sümmerer K, Trautmann W, Tsang MB, Verde G, Volant C, Wallace M, Weick H, Wiechula J, Wieloch A, and Zwiegliński B

Abstract

The A/Z dependence of projectile fragmentation at relativistic energies has been studied with the ALADIN forward spectrometer at SIS. A stable beam of (124)Sn and radioactive beams of (124)La and (107)Sn at 600 MeV per nucleon have been used in order to explore a wide range of isotopic compositions. Chemical freeze-out temperatures are found to be nearly invariant with respect to the A/Z of the produced spectator sources, consistent with predictions for expanded systems. Small Coulomb effects (DeltaT approximately 0.6 MeV) appear for residue production near the onset of multifragmentation.

Published
2009
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313. Observation of two-proton radioactivity of 19Mg by tracking the decay products.

Author

Mukha I, Sümmerer K, Acosta L, Alvarez MA, Casarejos E, Chatillon A, Cortina-Gil D, Espino J, Fomichev A, García-Ramos JE, Geissel H, Gómez-Camacho J, Grigorenko L, Hoffmann J, Kiselev O, Korsheninnikov A, Kurz N, Litvinov Y, Martel I, Nociforo C, Ott W, Pfutzner M, Rodríguez-Tajes C, Roeckl E, Stanoiu M, Weick H, and Woods PJ

Abstract

We have observed the two-proton radioactivity of the previously unknown (19)Mg ground state by tracking the decay products in-flight. For the first time, the trajectories of the 2p-decay products, (17)Ne+p+p, have been measured by using tracking microstrip detectors which allowed us to reconstruct the 2p-decay vertices and fragment correlations. The half-life of (19)Mg deduced from the measured vertex distribution is 4.0(15) ps in the system of (19)Mg. The Q value of the 2p decay of the (19)Mg ground state inferred from the measured p-p-(17)Ne correlations is 0.75(5) MeV.

Published
2007
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314. Evidence for pygmy and giant dipole resonances in 130Sn and 132Sn.

Author

Adrich P, Klimkiewicz A, Fallot M, Boretzky K, Aumann T, Cortina-Gil D, Pramanik UD, Elze TW, Emling H, Geissel H, Hellström M, Jones KL, Kratz JV, Kulessa R, Leifels Y, Nociforo C, Palit R, Simon H, Surówka G, Sümmerer K, and Waluś W

Abstract

The dipole strength distribution above the one-neutron separation energy was measured in the unstable 130Sn and the double-magic 132Sn isotopes. The results were deduced from Coulomb dissociation of secondary Sn beams with energies around 500 MeV/nucleon, produced by in-flight fission of a primary 238U beam. In addition to the giant dipole resonance, a resonancelike structure ("pygmy resonance") is observed at a lower excitation energy around 10 MeV exhausting a few percent of the isovector E1 energy-weighted sum rule. The results are discussed in the context of a predicted new dipole mode of excess neutrons oscillating out of phase with the core nucleons.

Published
2005
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315. Simultaneous measurement of beta- decay to bound and continuum electron states.

Author

Ohtsubo T, Bosch F, Geissel H, Maier L, Scheidenberger C, Attallah F, Beckert K, Beller P, Boutin D, Faestermann T, Franczak B, Franzke B, Hausmann M, Hellström M, Kaza E, Kienle P, Klepper O, Kluge HJ, Kozhuharov C, Litvinov YA, Matos M, Münzenberg G, Nolden F, Novikov YN, Portillo M, Radon T, Stadlmann J, Steck M, Stöhlker T, Sümmerer K, Takahashi K, Weick H, Winkler M, and Yamaguchi T

Abstract

We report the first measurement of a ratio lambda(beta(b))/lambda(beta(c)) of bound-state ((lambda(beta(b))) and continuum-state (lambda(beta(c))) beta(-)-decay rates for the case of bare 207Tl81+ ions. These ions were produced at the GSI fragment separator FRS by projectile fragmentation of a 208Pb beam. After in-flight separation with the Brho-deltaE-Brho method, they were injected into the experimental storage-ring ESR at an energy of 400.5A MeV, stored, and electron cooled. The number of both the 207Tl81+ ions and their bound-state beta(-)-decay daughters, hydrogen-like 207Pb81+ ions, were measured as a function of storage time by recording their Schottky-noise intensities. The experimental result, lambda(beta(b))/lambda(beta(c)) = 0.188(18), is in very good agreement with the value of 0.171(1) obtained from theory employing spectra of allowed transitions.

Published
2005
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316. Shell structure of the near-dripline nucleus 23O.

Author

Cortina-Gil D, Fernandez-Vazquez J, Aumann T, Baumann T, Benlliure J, Borge MJ, Chulkov LV, Datta Pramanik U, Forssén C, Fraile LM, Geissel H, Gerl J, Hammache F, Itahashi K, Janik R, Jonson B, Mandal S, Markenroth K, Meister M, Mocko M, Münzenberg G, Ohtsubo T, Ozawa A, Prezado Y, Pribora V, Riisager K, Scheit H, Schneider R, Schrieder G, Simon H, Sitar B, Stolz A, Strmen P, Sümmerer K, Szarka I, and Weick H

Abstract

Breakup reactions were used to study the ground-state configuration of the neutron-rich isotope 23O. The 22O fragments produced in one-nucleon removal from 23O at 938 MeV/nucleon in a carbon target were detected in coincidence with deexciting gamma rays. The widths of the longitudinal momentum distributions of the 22O fragments and the one-neutron removal cross sections were interpreted in the framework of a simple theoretical model which favors the assignment of Ipi = 1/2+ to the 23O ground state.

Published
2004
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317. Evidence for multiphonon giant resonances in electromagnetic fission of 238U.

Author

Ilievski S, Aumann T, Boretzky K, Elze TW, Emling H, Grünschloss A, Holeczek J, Holzmann R, Kozhuharov C, Kratz JV, Kulessa R, Leistenschneider A, Lubkiewicz E, Ohtsuki T, Reiter P, Simon H, Stelzer K, Stroth J, Sümmerer K, Wajda E, and Waluś W

Abstract

Differential cross sections for electromagnetic fission of 238U projectiles (500 MeV/u) in C, Sn, and Pb targets are measured and analyzed in terms of single- and multiphonon giant resonance excitations as doorway states to fission. A novel experimental method exploits the linear relationship between neutron multiplicity and the primary 238U excitation energy. Multiphonon states contribute up to 20% of the cross section; a component at high excitation energies is indicated that may arise from three-phonon dipole and two-phonon GDR x GQRiv giant resonance excitations.

Published
2004
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318. Coulomb dissociation of 8B and the low-energy cross section of the 7Be(p,gamma)8B solar fusion reaction.

Author

Schümann F, Hammache F, Typel S, Uhlig F, Sümmerer K, Böttcher I, Cortina D, Förster A, Gai M, Geissel H, Greife U, Iwasa N, Koczoń P, Kohlmeyer B, Kulessa R, Kumagai H, Kurz N, Menzel M, Motobayashi T, Oeschler H, Ozawa A, Płoskoń M, Prokopowicz W, Schwab E, Senger P, Strieder F, Sturm C, Sun ZY, Surówka G, Wagner A, and Waluś W

Abstract

An exclusive measurement of the Coulomb breakup of 8B into 7Be+p at 254A MeV allowed the study of the angular correlations of the breakup particles. These correlations demonstrate clearly that E1 multipolarity dominates and that E2 multipolarity can be neglected. By using a simple single-particle model for 8B and treating the breakup in first-order perturbation theory, we extract a zero-energy S factor of S17(0)=18.6+/-1.2+/-1.0 eV b, where the first error is experimental and the second one reflects the theoretical uncertainty in the extrapolation.

Published
2003
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319. Electromagnetically induced nuclear-charge pickup observed in ultrarelativistic Pb collisions.

Author

Scheidenberger C, Pshenichnov IA, Aumann T, Datz S, Sümmerer K, Bondorf JP, Boutin D, Geissel H, Grafström P, Knudsen H, Krause HF, Lommel B, Møller SP, Münzenberg G, Schuch RH, Uggerhøj E, Uggerhøj U, Vane CR, Ventura A, Vilakazi ZZ, and Weick H

Abstract

A strong increase of inclusive nuclear-charge pickup cross sections, forming 83Bi from 158A GeV 82Pb ions, is observed in comparison to similar measurements at 10.6A GeV. From the dependence of these cross sections on target atomic number, this increase is attributed to the electromagnetic process of pion production by equivalent photons. The observed cross sections can be reproduced quantitatively using the recently developed RELDIS code.

Published
2002
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320. Photoneutron cross sections for unstable neutron-rich oxygen isotopes.

Author

Leistenschneider A, Aumann T, Boretzky K, Cortina D, Cub J, Datta Pramanik U, Dostal W, Elze TW, Emling H, Geissel H, Grünschloss A, Hellstr M, Holzmann R, Ilievski S, Iwasa N, Kaspar M, Kleinböhl A, Kratz JV, Kulessa R, Leifels Y, Lubkiewicz E, Münzenberg G, Reiter P, Rejmund M, Scheidenberger C, Schlegel C, Simon H, Stroth J, Sümmerer K, Wajda E, Walús W, and Wan S

Abstract

The dipole response of stable and unstable neutron-rich oxygen nuclei of masses A = 17 to A = 22 has been investigated experimentally utilizing electromagnetic excitation in heavy-ion collisions at beam energies about 600 MeV/nucleon. A kinematically complete measurement of the neutron decay channel in inelastic scattering of the secondary beam projectiles from a Pb target was performed. Differential electromagnetic excitation cross sections d sigma/dE were derived up to 30 MeV excitation energy. In contrast to stable nuclei, the deduced dipole strength distribution appears to be strongly fragmented and systematically exhibits a considerable fraction of low-lying strength.

Published
2001
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329. First observation of bound-state beta - decay.

Author

Jung M, Bosch F, Beckert K, Eickhoff H, Folger H, Franzke B, Gruber A, Kienle P, Klepper O, Koenig W, Kozhuharov C, Mann R, Moshammer R, Nolden F, Schaaf U, Soff G, Spädtke P, Steck M, Stöhlker T, and Sümmerer K

Published
1992
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338. Attempts to produce superheavy elements by fusion of 48Ca with 248Cm in the bombarding energy range of 4.5-5.2 MeV/u.

Author

Armbruster P, Agarwal YK, Brüchle W, Brügger M, Dufour JP, Gaggeler H, Hessberger FP, Hofmann S, Lemmertz P, Münzenberg G, Poppensieker K, Reisdorf W, Schadel M, Schmidt K, Schneider JH, Schneider WF, Sümmerer K, Vermeulen D, Wirth aG, Ghiorso A, Gregorich KE, Lee D, Leino M, Moody KJ, Seaborg GT, Welch RB, Wilmarth P, Yashita S, Frink C, Greulich N, Herrmann G, Hickmann U, Hildebrand N, Kratz JV, Trautman N, Fowler MM, Hoffman DC, Daniels WR, von Gunten HR, and Dornhöfer H

Published
1985
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