Light-particle emission and heavy-residue formation in the fusion-like reactions 40Ar+40Ca at 15 MeV/u and 28Si+28Si at 20 MeV/u

Towards a unified description of evaporation-residue fusion cross-sections above the barrier

“…In five experiments 22 fusion cross section values are reported [42][43][44][45][46]. Some of them, taken at the same or very close E inc , differ substantially (see in fig.…”

“…Despite a broad coverage in the α and N sys /Z sys variables many of data are for the mass symmetric systems and, in particular, for the systems with the equal number of neutrons N sys and protons Z sys . About 100 additional data points from those measurements which have reported existence of a non-negligible fusion-fission component will be presented p-1 [18,19] 20Ne+16O [20] 24Mg+12C [21] 12C+27Al [22] 16O+24Mg [23] 20Ne+20Ne [20] 28Si+12C [24,25] 14N+27Al [26] 16O+26Mg [23] 18O+24Mg [23] 16O+27Al [27][28][29] 32S+12C [30][31][32][33][34] 20Ne+26Mg [35] 20Ne+27Al [28,36] 20Ne+27Al [28,36] 35Cl+12C [37][38][39] 16O+32S [28] 16O+40Ca [40,41] 28Si+28Si [42][43][44][45][46] 28Si+28Si [42][43][44][45][46] 32S+24Mg [47,48] 19F+40Ca [49,50] 32S+27Al [28,49] 35C...…”

Light-particle emission versus evaporation residue formation in collisions of40Ar onnatCa at 30 MeV/u

“…The present investigation extends earlier studies [1][2][3] on PE light-particle emission in the system 4~ + 4~ to higher energies. We focus on events where an ER is formed.…”

“…In the experiments with lower incident energies [1,3] a hot moving source parametrization with two maxwellian-shaped distributions successfully described the measured double differential neutron multiplicities in a consistent manner at all angles and enabled the decomposition of the spectra into an equilibrium (EQ) and a preequilibrium (PE) component. The following parametrization was taken (all quantities in the c.m.…”

“…The measured neutron angular distribution is compared in Fig. 5 with model calculations which successfully reproduced differential preequilibrium cross sections at lower energied [1,3]: the quantal phase-space model (QPSM) [11] and the (modified) nucleon exchange transport model (NETM) [19]. Both models are free of adjustable parameters.…”