Graduate Thesis Or Dissertation

 

Target fragmentation in the interaction of relativistic heavy ions and protons with ¹⁸¹Ta Public Deposited

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/p2677045z

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  • The production cross sections for a number of target fragments formed by the reactions of 42- and 21- GeV²⁰ Ne and 28 GeV p with ¹⁸¹Ta have been measured. The target fragment radioactivities were measured by off-line gamma-ray spectroscopy. Details of the measurement as well as the calculation of the independent nuclidic production cross sections and the integrated isobaric yields are given. Comparisons between these data and previously reported data for proton and heavy ion induced nuclear reactions with heavy targets have been used to test the hypotheses of limiting fragmentation and factorization, and the dependence of the total reaction cross section on projectile energy. These comparisons indicate that limiting fragmentation describes product mass yields at projectile energies from 5-42 GeV; that the total reaction cross sections for the heavy ion induced reactions are enhanced by a geometric factor over the total reaction cross sections for reactions induced by protons of similar total kinetic energy; and that the total reaction cross section (as estimated from radioactive residue yields) for the ²⁰Ne + ¹⁸¹Ta system shows no dependence on projectile energy at Eproj. > ~10 MeV/A and has a value of > ~0.8 the geometric cross section. A comparison of the data to previously reported data for proton induced reactions shows that the total kinetic energy of the projectile is a better parameter than the projectile velocity for describing mass yield results for high mass targets. Comparisons of mass yield data with nuclear firestreak model calculations show that the model predicts approximately the correct shape for high mass product distributions but overestimates the absolute cross sections. The failure of the firestreak model to predict the observed constance of σR with changes in projectile energy may indicate some fundamental difficulties with this model.
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