科研之友
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摘要
Two new formulas for the (-2) moment of the photoabsorption cross section, sigma(-2), have been determined, respectively, from the 1988 photoneutron evaluation of Dietrich and Berman and a mass-dependent symmetry energy coefficient, a(sym)(A). The data for A greater than or similar to 50 follow, with a RMS deviation of 6%, the power law sigma(-2) = 2.4A(5/3) mu b/MeV, which is in agreement with Migdal's calculation of sigma(-2) = 2.25A(5/3) mu b/MeV based on the hydrodynamic model and the sigma(-2) sum rule. The additional inclusion of a(sym)(A) provides a deeper insight into the nuclear polarization of A >= 10 nuclei.
- 出版日期2015-6-4
