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The statistical multistep compound (SMC) theory of Feshbach, Kerman and Koonin (FKK) is used to analyse the energy and angular distributions of 14 MeV neutrons inelastically scattered by 59C0 and 93Nb. An acceptable fit is obtained to the whole energy spectrum provided the contributions from the (n, 2n) and (n, pn) reactions, also calculated with the SMC formalism, are added at low energies. The theory also accounts well for the (n, p) cross sections. The sensitivity of the results to the level density parameters is investigated.

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We recast the study of a closed string gas in a toroidal container in the physical situation in which the single string density of states is independent of the volume because energy density is very high. This includes the gas for the well known Brandenberger-Vafa cosmological scenario. We describe the gas in the grand canonical and microcanonical ensembles. In the microcanonical description, we find a result that clearly confronts the Brandenberger-Vafa calculation to get the specific heat of the system. The important point is that we use the same approach to the problem but a different regularization. By the way, we show that, in the complex temperature formalism, at the Hagedorn singularity, the analytic structure obtained from the so-called F-representation of the free energy coincides with the one computed using the S-representation.