10 research outputs found
Guest Charge and Potential Fluctuations in Two-Dimensional Classical Coulomb Systems
A known generalization of the Stillinger-Lovett sum rule for a guest charge
immersed in a two-dimensional one-component plasma (the second moment of the
screening cloud around this guest charge) is more simply retrieved, just by
using the BGY hierarchy for a mixture of several species; the zeroth moment of
the excess density around a guest charge immersed in a two-component plasma is
also obtained. The moments of the electric potential are related to the excess
chemical potential of a guest charge; explicit results are obtained in several
special cases.Comment: 21 pages. Latex. Appendix moved, with changes, to new subsection 2.3.
Description of the Appendix at the end of the Introduction, from an earlier
version, delete
Mechanisms in knockout reactions
We report on the first detailed study of the mechanisms involved in knockout reactions, via a coincidence measurement of the residue and fast proton in one-proton knockout reactions, using the S800 spectrograph in combination with the HiRA detector array at the NSCL. Results on the reactions Be(C,B+X)Y and Be(B,Be+X)Y are presented. They are compared with theoretical predictions for both the diffraction and stripping reaction mechanisms, as calculated in the eikonal model. The data shows a clear distinction between the two reaction mechanisms, and the observed respective proportions are very well reproduced by the reaction theory. This agreement supports the results of knockout reaction analyses and their applications to the spectroscopy of rare isotopes
Two-proton decay of the 6Be ground state and the double isobaric analog of 11Li
Two-proton decay is discussed in a number of light isobaric multiplets. For the lightest two-proton emitter, 6Be, the momentum correlations between the three decay products were measured and found to be consistent with quantum-mechanical three-cluster-model calculations. Two-proton decay was also found for two members of the A=8 and A=11 quintets. Finally, a third member of the A=11 sextet, the double isobaric analog of the halo nucleus 11Li in 11B was observed by its two-proton decay