Julie Haglund's pictureJulie Haglund

Hope College

Dr. DeYoung and Dr. Peaslee (Nuclear Group)

Supported by NSF-REU

Probing Nuclear Temperatures via Charged Particle Emission

Accurate measurements of nuclear temperatures are presently of great interest in the formulation of an equation of state for nuclear matter as well as in the determination of the existence of a nuclear liquid-gas phase transition. In this work, the continuation of data analysis from a nuclear physics experiment which was conducted at Michigan State University is presented. This experiment involved the acceleration of a beam of krypton projectiles at 35A MeV, 55A MeV, and 70A MeV, incident on a gold target. When krypton nuclei strike the gold nuclei, compound nuclei can be created. These composite nuclei then decay, emitting light charged particles such as protons, deuterons, tritons, isotopes of helium, and isotopes of lithium. These charges particles were detected via the use of cesium iodide scintillators in a four pi detector.

My research involved the quantitative assessment of various isotopes emitted by the compound nuclei. the ratios of emitted isotopes were then assimilated into equations which were used to calculate the temperatures of the emitting nuclei. The results of these calculations confirm or refute similar analyses which have been conducted by others at differing detection angles.

This was a summer of tremendous academic growth for me. While an adequate level of understanding may come from the reading of a text, a far greater and more useful understanding of scientific equipment and methods results from the use and repair of this equipment, and the analysis of data which is associated with research work. This physics research experience introduced me to awing technology, and I greatly appreciate the patience and understanding of my advisors as I attempted to meet the challenge of working with complex computer and experimental equipment which is so familiar to them.

Publications and Presentations:
“Evidence of Non-Equilbrium Proton Emission in a Low-Energy Heavy-Ion Reaction.” P.A. DeYoung, M.J. Goupell*, B.V. Atallah*, J.A. Haglund*, P.L. Jovivette, M.K. MacDermaid*, G.F. Peaslee, J.J. Kolata, E.D. Bereners, D. Peterson, J. vonSchwarzenbert, and J.D. Hinnefeld. Phys.Rev. C 61, 024603 (2000).