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[en] The ²⁰Ne + ¹⁸¹Ta reaction cross section leading to products with A > 40 is compared with the nucleon-nucleon cross section as a function of projectile energy. No evidence for transparency in composite projectile-nucleus collisions is seen. 1 figure

[en] This report discusses the following topics related to nuclear chemistry: Element 110; synthesis of heavy nuclei with complete fusion reactions involving radioactive nuclear beams; the interaction of 21--44 MeV/nucleon Xe with Au; MeV/nucleon ⁸⁶Kr with ¹⁹⁷Au; intermediate energy Ar-Th collisions; target-like fragments from the interaction of 29 MeV/nucleon ²⁰⁸Pb with ¹⁹⁷Au; the intermediate of 22 and 32 MeV/nucleon ¹⁶O with ¹⁹⁷Au; Au projectile fragmentation at 20 MeV/nucleon; relativistic heavy ion research; and pulse height defect measurements for very heavy ions

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[en] A brief summary of all work completed under Contract No. EY-76-S-06-2227, Task Agreement 7 is given. Work is described concerning the probability of fission, the transition state nucleus and its properties, fission product energy distributions, fission fragment angular momentum, ternary fission, long range α particle emission, nuclear spectroscopy of fission products, studies involving low energy and relativistic heavy ions, and nuclear environmental chemistry. A bibliography of publications resulting from this contract is appended

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[en] In this report, the authors summarize the highlights of the work done between August 1, 1995, and August 1, 1996. The work reported herein is the result of a collaborative effort between the nuclear chemists at Oregon State University and many other individuals and research groups. Each project discussed was the result of a joint effort of the groups, interchanging roles in data acquisition and analysis. The work described is part of a project involving the study of low energy (< 10 MeV/nucleon), and intermediate energy (10--100 MeV/nucleon) heavy ion reactions. Their work in the low energy regime included: the first US studies of fusion utilizing radioactive beams. Half of their effort was spent in the study of intermediate energy nuclear collisions. Among the accomplishments were: the establishment of a systematics of angular momentum transfer in peripheral collisions; completion of the first portion of high resolution studies of heavy residue formation in reactions induced by 20 MeV/nucleon ¹⁹⁷Au utilizing the MSU A1200 separator; synthesis of several new neutron-deficient nuclides in reactions of 20 MeV/nucleon ¹⁹⁷Au with heavy targets (Ti, Zr and Au); their participation in exclusive studies of heavy residue formation in the reaction of 35 MeV/nucleon ⁸⁶Kr with ¹⁹⁷Au in which it was found that the residues had large associated particle multiplicities indicating their formation in highly dissipative collisions, and that particle emission leading to residue formation relative to fission was favored as the dissipated energy increased

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[en] An attempt to synthesize element 110 by the ⁵⁹Co + ²⁰⁹Bi reaction was made. Detection of the evaporation residues was with the gas-filled magnetic separator SASSY 2. About 1.3 x 10¹⁸⁵⁹Co ions of energies ranging from 290-307 MeV passed through the 0.5 mg/cm²²⁰⁹Bi targets over a period of 41 days. No events that are clearly attributable to the decay of isotopes of element 110 were observed. Assuming an efficiency of the SASSY separator of ∼50%, and that all ⁵⁹Co energies were equally effective, an upper limit cross section of ∼1 x 10^-36 cm² for the production of isotopes of element 110 with 0.1 μsec < t_1/2 <1 sec can be deduced from the data. Discussion of the choice of projectile energy, performance of the target-separator system and any unusual events will be given

No abstract available