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Average Reaction Cross Sections For 74- To 112-Mev Α Particles On 127I And 133Cs, R. E. Warner, H. W. Wilschut, W. F. Rulla, Gary Felder
Average Reaction Cross Sections For 74- To 112-Mev Α Particles On 127I And 133Cs, R. E. Warner, H. W. Wilschut, W. F. Rulla, Gary Felder
Physics: Faculty Publications
The average reaction cross section for 74- to 112-MeV α particles on 127I and 133Cs was measured by a new method using a magnetic spectrograph and a CsI scintillation detector. The result, σR=2220±50 mb, is in good agreement with optical model calculations and finite-range microscopic calculations. Zero-range microscopic calculations underpredict σR by about 10%, while strong absorption theories overpredict σR by large amounts.
Microscopic Calculations Of Low-Energy Reaction Cross Sections, R. E. Warner, Gary Felder
Microscopic Calculations Of Low-Energy Reaction Cross Sections, R. E. Warner, Gary Felder
Physics: Faculty Publications
Microscopic calculations of nuclear reaction cross sections and total reaction probabilities are compared with measurements for the d+Si, 3,4He+Si, and d+Ge systems at energies ranging from 2 to 53 MeV/nucleon. Good agreement is obtained, except for 3He+Si at the very lowest energies, when zero-range nucleon-nucleon forces are assumed and realistic nuclear density distributions are used in the tail regions, where the models are most sensitive. The agreement is less good for finite-range forces. A strong absorption model gives much poorer agreement with the recent 4He+Si measurements than do the microscopic models.
Specific-Heat Study Of The Anomalous Quantum Limit Of (Tmtsf)2clo4, Nathanael A. Fortune, J. S. Brooks, M. J. Graf, G. Montambaux, L. Y. Chiang, Jos A.A.J. Perenboom, D. Althof
Specific-Heat Study Of The Anomalous Quantum Limit Of (Tmtsf)2clo4, Nathanael A. Fortune, J. S. Brooks, M. J. Graf, G. Montambaux, L. Y. Chiang, Jos A.A.J. Perenboom, D. Althof
Physics: Faculty Publications
We report calorimetric measurements of the organic conductor (TMTSF)2ClO4 in the quantum limit. In addition to the field-induced spin-density-wave (FISDW) phases, we have measured the magnetic-field-dependent specific heat associated with the recently discovered reentrant phase. In terms of a semiempirical model, we find that the reentrant transition is second order, but that the electronic density of states is greatly reduced in the reentrant phase. We also observe a specific-heat signal corresponding to the anomalous fast oscillations which are known to coexist with the FISDW phases.