Quasifragments: hot nuclei embedded in a nucleon vapor
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Description
In nuclear collisions at intermediate energies, metastable complex nuclear fragments are produced abundantly during the primary stage of the reaction. Therefore, statistical models for nuclear disassembly must incorporate highly excited unstable fragment states in the phase space considered. In our previous treatments of nuclear disassembly, a particular unstable fragment state was included in the final phase space provided its (estimated) half-life exceeded the time characterizing the breakup process. A similar prescription was also employed in the recent exact microcanonical model of nuclear disassembly. Although such life-time arguments are intuitively appealing in the context of a disassembling source, their relevance is …
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Description
In nuclear collisions at intermediate energies, metastable complex nuclear fragments are produced abundantly during the primary stage of the reaction. Therefore, statistical models for nuclear disassembly must incorporate highly excited unstable fragment states in the phase space considered. In our previous treatments of nuclear disassembly, a particular unstable fragment state was included in the final phase space provided its (estimated) half-life exceeded the time characterizing the breakup process. A similar prescription was also employed in the recent exact microcanonical model of nuclear disassembly. Although such life-time arguments are intuitively appealing in the context of a disassembling source, their relevance is less clear for the treatment of static problems, e.g. excited infinite nuclear matter at subsaturation densities. It is therefore desirable to seek a better foundation for the description of high excited nuclear states, applicable to both static and dynamical scenarios. This is also practically important for the implementation of event generators developed to provide samples of multi-fragment final states of medium-energy nuclear collisions. Furthermore, microscopic dynamical simulations also encounter the problem when seeking to give a realistic description of the final nuclear fragments.
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