Mutual ionization in H⁻–H⁻collisions

Abstract

For the first time, charge-changing reactions in collisions of two negative ions were investigated. Absolute cross sections for mutual ionization were determined for H− colliding with H−, using crossed beams and coincident detection of the reaction products. The centre-of-mass energy range covered in the experiment extended from 1.5 keV to 90 keV for the reaction channel H− + H− to H0 + H0 + 2e− and from 4 keV to 40 keV for the channel H− + H− to H0 + H+ + 3e−. The measured cross sections are compared with results of CTMC calculations obtained with different model potentials for the interaction between the outer electron and the H0 core

Phenomenological construction of a relativistic nucleon–nucleon interaction for the superfluid gap equation in finite density systems

“…The precise origin of this difference has not been understood well. A comparison after taking the polarization effects which have been known to be important at finite densities [16][17][18] into account may be necessary (see also Ref. [12]).…”

Constructing Effective Pair Wave Function from Relativistic Mean Field Theory with a Cutoff

“…Medium renormalizations are understood to cause the gap to become larger because they weaken the short-range repulsion. Irrespective of whether the medium renormalizations are included, the particle-hole polarizations should be considered in the next order according to a diagrammatic analysis of the gap equation [9], and it is said that they act to reduce the gaps [10,11,12]. Another approach to the pairing in nuclear matter is based on the effective interactions that are constructed from the beginning to describe finite-density systems.…”

Pairing Correlations in Nuclear Systems, From Infinite Matter to Finite Nuclei

“…The results of different groups are in close agreement on the 1 S 0 pairing gap values and on its density dependence, which shows a peak value of about 3 MeV at a Fermi momentum close to k F ≈ 0.8 fm −1 2,3,4,5 . All these calculations adopt the bare NN interaction as the pairing force, and it has been pointed out that the screening by the medium of the interaction could strongly reduce the pairing strength in this channel 5,6,7 . However, the issue of the many-body calculation of the pairing effective interaction is a complex one and still far from a satisfactory solution.…”