Elastic scattering of the proton drip-line nucleusF17

Abstract

Precision data have been obtained for the elastic scattering of 17 F on 12 C and 14 N at 10 MeV/nucleon to clarify the reaction mechanism for loosely bound nuclei at low energies and to assess the validity of a double-folding procedure to predict optical model potentials for use in indirect methods for nuclear astrophysics. The double-folding procedure incorporates density and energy-dependent effective nucleon-nucleon interactions with realistic densities consistent with experimentally determined asymptotic normalization coefficients. The derived potentials provide an excellent description of the data and point to a complete dominance of absorption at the barrier. A semiclassical analysis in terms of multireflection barrier-internal barrier series expansion of the scattering amplitude shows that only the barrier component survives in the scattering process, pointing to the peripheral character of the reactions.

Astrophysical S-factor of the [sup 12]N(p,γ)[sup 13]O Reaction Determined from the ([sup 12]N,[sup 13]O) Proton Transfer Reaction

“…1 (a) that represent the 12 N locus. The elastic peak is centered around 0 MeV and a software Q-value cut from -2.5 MeV to 2.5 MeV was applied to select the elastic channel corresponding to the scattering off 12 C and 14 N nuclei. The small left-side inelastic peak corresponds to the -4.43 MeV energy of the first excited state in 12 C. No bound excited states exist in 12 N. be problematic for the aforementioned Q-value cut of the elastic channel.…”

“…The procedure was established from a systematic search [6] of optical potentials for use in the description of elastic and transfer reactions involving stable loosely bound p-shell nuclei. It has also been proved to work fairly well for the elastic scattering of radioactive nuclei such as 7 Be, 8 B [9], 11 C, 13 N [11] and 17 F [12]. The folding model uses the effective nucleonnucleon interaction from the nuclear matter approach of Jeukenne, Lejeune, and Mahaux (JLM) [13] with parameters tuned by Bauge et al [14] for nucleon-nucleus scattering.…”

“…The smallest metallicity needed for an explosion was Z = 0.005. For the failed explosion, it was reasoned that in the short time scales of the collapse insufficient amounts of 12 C and other heavy elements are produced by the triple alpha process, 3 → α 12 C. By t = 10 4 s into the collapse, the authors found that the central temperatures and densities are of the order of 10 9 K and 1000 g/cm 3 , respectively. Under these conditions hydrogen is burned rapidly by the rp-process.…”

A comprehensive study of 17F + 12C system at 60 MeV: cluster model, optical model and double

“…AP and AT are devoted to the masses of projectile and target nuclei. In determining the parameters of the nuclear potential we have started with the values given by Blackmon et al (2005). Then, we have changed the parameters of the Woods-Saxon potential in order to obtain good agreement results with the experimental data.…”

“… it is very interesting due to its effect in the hot CNO cycle of nuclear  17 F has two bound states (ground state and one excited bound state)  the first excited state of 17 F has a halo structure  the first excited state of 17 F is J π =(1/2) + and Ex=0.5 MeV Many theoretical and experimental studies have been carried out on the 17 F nucleus (Liang et al 2000;Liang et al 2003;Romoli et al 2004;Blackmon et al 2005;Mazzocco et al 2010;Signorini et al 2010;Kucuk & Moro 2012). Recently, Zhang et al (2012) have measured the quasi-elastic scattering data of 17 F scattered from 12 C at 60 MeV.…”