1,538 research outputs found
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Concluding remarks presented at the Symposium on heavy ion reaction dynamics on the tandem energy region
No full textThis paper discusses the divisions between different heavy ion reaction processes. Fusion, deep inelastic, quasi-elastic and elastic interactions are discussed in terms of coupled channel calculations. 20 refs., 8 figs. (LSP
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Sub-barrier fusion: An experimental review
No full textThis paper contains a review of the current status of the experimental study of heavy-ion fusion at sub-barrier energies. Emphasis is placed on the comparison of the experimentally observed quantities with theoretical expectations. Results of measurements of the spin distributions of the composite systems formed following fusion are critically examined with a view to understanding the large discrepancies between theory and experiment which exist for some systems. 20 refs., 14 figs
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Resonances in heavy systems
No full textThe experimental situation for the study of resonances in heavy-ion collisions is reviewed, with emphasis on the heaviest systems. New data are presented which show some of the systematics of this phenomenon. The narrow resonance structures are established as a feature of the nuclear structure of the composite system rather than a purely entrance channel effect
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Anomalous positrons from heavy ion collisions: Past results and future plans
No full textThe current status of the experimental study of anomalous lines observed in the spectra of positrons produced in heavy ion collisions is reviewed. A new experiment to measure positron-electron coincidences is discussed. 26 refs., 14 figs., 2 tabs
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Alpha-transfer reactions
No full textSome of the essential features of the experimental results and theoretical interpretations of ..cap alpha..-transfer reactions are summarized. (WHK
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Sub-barrier reactions measured using a recoil mass separator
No full textFew data exist in the sub-barrier region for reaction channels other than fusion. In particular, our experimental knowledge of quasi-elastic transfer reactions is sparse, despite the belief that this particular channel may be dominant in determining some features of the sub-barrier fusion enhancement. Transfer reactions are governed primarily by the closet approach of the colliding nuclei which, at low energies, results in a strong backward peaking of the angular distribution in the center-of-mass frame. For situations where the projectile has a significant fraction of the target mass, as is so in most cases of interest, the backscattered projectile-like fragment has such low energy that the usual techniques of measurement and identification become invalid. Here, we report on a solution to this problem which allows a systematic study of many aspects of transfer reactions in the energy regime of interest. We exploit the fact that associated with the low-energy backscattered projectile-like fragment is a complementary target-like fragment which recoils to forward angles with a large fraction of the incident beam energy. These target-like fragments were detected and identified using the Daresbury Recoil Mass Separator thus allowing the measurement of quasi-elastic transfer over hitherto inaccessible energy range from the vicinity of the barrier to several tens of MeV below. The experiments described here used VYNi beams of energies ranging from 180 to 260 MeV provided by the Daresbury Laboratory Nuclear Structure Facility tandem accelerator. Data on sub-barrier transfer for targets of /sup 116,118,120,122,124/Sn and /sup 144,148,150,152,154/Sm were obtained. 16 refs., 10 figs., 2 tabs
What is the Time Limit for Filing a Lawsuit? It Depends on What Your Definition of Arising Under Is! An Analysis of Jones v. R.R. Donnelley & Sons Co.
No full textThis article previews the Supreme Court case Jones et. al. v. R.R. Donnelly & Sons Co., 541 U.S. 369 (2004). The author predicted that the case would require the court to determine the appropriate statute of limitations to apply in a class action race-discrimination lawsuit filed under 42 U.S.C. § 1981
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Heavy ion transfer reactions: Status and prospects
No full textSome comments are addressed to the current status of and possible future directions for transfer reactions induced by heavy ions
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Sub-barrier transfer reactions measured with a recoil mass separator
No full textThe measurement of sub-barrier transfer reactions between heavy ions using a recoil mass separator is discussed. Data are presented for one and two particle transfer reactions of /sup 58/Ni + /sup A/Sn and /sup 58/Ni + /sup A/Sm over a range of bombarding energies from close to far below the interaction barrier. The data are analyzed in the framework of a semi-classical model of the transfer process. The results for one-nucleon transfer on the deformed targets show anomalous behavior. 8 refs., 9 figs., 2 tabs
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High-angular-momentum resonances in /sup 28/Si + /sup 28/Si scattering
No full textThe initial expectation was that resonance behavior in heavy-ion systems would be limited to only a few special systems and to energies not too far above the Coulomb barrier. The past few years have shown us that this behavior has a much wider extent than was previously thought possible, although in many cases the indications of resonance behavior is at best qualitative. Results are presented for the /sup 28/Si + /sup 28/Si system - the heaviest in which resonance behavior has yet been observed. (WHK
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