Multi-nucleon transfer reactions and the formation of light charged particles in the systemnatAg+40Ar (285 MeV)

Abstract

In the reaction natAg+4~ (285 MeV) there have been measured the energy spectra of the isotopes of elements from H to C1 at an emission angle of 40 ~ the energy spectra and angular distributions of 1H, 2H, 3H, and ~He, and the angular distributions of Li, Be, B, and C. The contribution from multinucleon transfer reactions to the formation of light charged particles is discussed.

Production cross-sections of proton-rich 70Ge fragments and the decay of 57Zn and 61Ge

“…[14]). Figure 3 shows a plot of the logarithm of the cross sections as a function of the Q value to reach the different nuclei.…”

“…With a β-decay Q value determined from the values above of 9.62(6) MeV, we determine the f value to be 34125(1130) s. This value and the partial half-life for the decay to the IAS of 82 (14) ms yield an f t value of 2800(500) s. This value is again slighly larger than the theoretical value of 2047 s for the superallowed decay between the two T=3/2 analogue states.…”

Products of 3?Z?9 from long-lived intermediates in the reactions 336 MeV40Ar+Ag,154Sm and Au

“…By contrast, the H/He energy and angular distributions at backward angles are "relaxed", backward peaked and thus strongly suggestive of evaporative behavior [6][7][8]. Products of Z>10 are also often forward peaked, but as one moves toward back angles their energy and angular distributions also suggest a much slower fission-like behavior [2][3][4][5]. Moretto and coworkers have included some of the products of 3_<Z_<9 in their systematic studies of deeply inelastic reactions (4~ 2~ 4~ [2][3][4].…”

“…both reactants have A >__40). They occupy a deep crevasse in the yield-mass curve between lofty peakes for neutrons, protons and alpha particles [-1] and the rounded hilltops at higher mass for deeply inelastic and fission reactions [2][3][4][5]. The properties of these products (3__<Z <9) have not been studied in as much detail as their neighbors, but they do seem to have many features in common with them.…”

Description of light charged particle multiplicities in the framework of dinuclear system model

“…The light particles produced in fusionfission and quasifission reactions may be associated with either pre-equilibrium emission or the later evaporation from thermally equilibrated products. In these reactions particle evaporation arises both from the composite nuclear system and from fission-like fragments produced by fusionfission and quasifission processes [1][2][3][4][5][6][7]. Coincidence measurements have allowed to use particle emission process to probe the very early stage of nuclear reactions and the individual reaction mechanisms.…”