A. Szanto de Toledo

Fusion versus breakup: observation of large fusion suppression for 9Be + 208Pb

Complete fusion excitation functions for

Binary decay of light nuclear systems

{}^{9}\mathrm{Be}{+}^{208}\mathrm{Pb}

New measurement of the 11B(p,α0)8Be bare-nucleus S(E) factor via the Trojan horse method

have been measured to high precision at near barrier energies. The experimental fusion barrier distribution extracted from these data allows reliable prediction of the expected complete fusion cross sections. However, the measured cross sections are only 68% of those predicted. The large cross sections observed for incomplete fusion products support the interpretation that this suppression of fusion is caused by

Reaction mechanisms in the 6Li + 59Co system

{}^{9}\mathrm{Be}

Deformation effects in 56 Ni nuclei produced in 28 Si + 28 Si at 112 MeV

breaking up into charged fragments before reaching the fusion barrier. Implications for the fusion of radioactive nuclei are discussed.

Measurement of the 10 keV resonance in the B 10 ( p , α 0 ) Be 7 reaction via the Trojan Horse method

A review of the characteristic features found in fully energy-damped, binary decay yields from light heavy-ion reactions with 20≤Atarget+Aprojectile≤80 is presented. The different aspects of these yields that have been used to support models of compound-nucleus (CN) fission and deep-inelastic dinucleus orbiting are highlighted. Cross-section calculations based on the statistical phase space at different stages of the reaction are presented and compared to the experimental results. Although the statistical models are found to reproduce most of the observed experimental behaviors, an additional reaction component corresponding to a heavy-ion resonance or orbiting mechanism is also evident in certain systems. The system dependence of this second component is discussed. The extent to which the binary yields in very light systems (ACN≤32) can be viewed as resulting from a fusion–fission mechanism is explored. A number of unresolved questions, such as whether the different observed behaviors reflect characteristically different reaction times, are discussed.

Highly deformed 40 Ca configurations in 28 Si + 12 C

A new measurement of the 11B(p,?0)8Be has been performed applying the Trojan horse method (THM) to the 2H(11B,?80Be)n quasi-free reaction induced at a laboratory energy of 27 MeV. The astrophysical S(E) factor has been extracted from ?600 keV down to zero energy by means of an improved data analysis technique and it has been compared with direct data available in the literature. The range investigated here overlaps with the energy region of the light element LiBeB stellar burning and with that of future aneutronic fusion power plants using the 11B+p fuel cycle. The new investigation described here confirms the preliminary results obtained in the recent TH works. The origin of the discrepancy between the direct estimate of the 11B(p,?0)8Be S(E)-factor at zero energy and that from a previous THM investigation is quantitatively corroborated. The results obtained here support, within the experimental uncertainties, the low-energy S(E)-factor extrapolation and the value of the electron screening potential deduced from direct measurements.

Macroscopic features of light heavy-ion fission reactions

Abstract The reactions induced by the weakly bound 6 Li projectile interacting with the intermediate mass target 59 Co were investigated. Light charged particles singles and α – d coincidence measurements were performed at the near barrier energies E lab = 17.4 , 21.5, 25.5 and 29.6 MeV. The main contributions of the different competing mechanisms are discussed. A statistical model analysis, Continuum-Discretized Coupled-Channels (CDCC) calculations and two-body kinematics were used as tools to provide information to disentangle the main components of these mechanisms. A significant contribution of the direct breakup was observed through the difference between the experimental sequential breakup cross section and the CDCC prediction for the non-capture breakup cross section.

Influence of nucleon Fermi motion on incomplete fusion

Velocity and energy spectra of the light charged particles emitted in the

Vanishing spin alignment: Experimental indication of a triaxial {sup 28}Si+{sup 28}Si nuclear molecule

{}^{28}\mathrm{Si}{(E}_{\mathrm{lab}}=112 \mathrm{MeV}{)+}^{28}\mathrm{Si}