Spectroscopy of high-lying resonances in Be9 by the measurement of ( p,p ), ( p,d

Abstract

We measured the 8 Li(p, p) 8 Li, 8 Li(p, d ) 7 Li, and 8 Li(p, α) 5 He reactions at low energies using the thick target inverse kinematics method, with a polyethylene [CH 2 ] n target and a radioactive 8 Li beam available at the Radioactive Ion Beams in Brazil facility of São Paulo. By measuring simultaneously several reaction channels (p, p), (p, d ), and (p, α), the still uncertain high-lying resonances of 9 Be, close to the proton threshold, can be studied and their parameters, such as energy, width, and spin parity can be more reliably determined. The experimental excitation functions of the reactions 8 Li(p, p) 8 Li, 8 Li(p, d ) 7 Li, and 8 Li(p, α) 5 He were analyzed using the R-matrix theory, which allows us to infer the properties of the resonances. Multichannel R-matrix analysis provides evidence for a significant clustering in the (p, d ) channel. The experimental data and the multichannel R-matrix analysis will be presented.

THE ROLE OF RESONANCES IN THE CAPTURE OF 8Li(p,)9Be ON THE REACTION RATE OF THE RELEVANT ASTROPHYSICAL SYNTHESIS OF 9Be

“…However, these works were published in the 1960s and we do not currently possess more modern experimental studies of the total cross sections of the considered reaction [15]. This is in spite of the fact that studies of spectra 9 Be in the p 8 Li channel are still continuing [16]. In addition, the available and considered further theoretical results differ so greatly that it is difficult to draw certain conclusions regarding the rate of this reaction.…”

“…In addition, the available and considered further theoretical results differ so greatly that it is difficult to draw certain conclusions regarding the rate of this reaction. Furthermore, these calculations do not take into account the existence of resonances in the p 8 Li system at low energies [16].…”

“…In the present study, we consider the reaction of the proton capture on 8 Li in the frame of the modified potential cluster model (MPCM) [17] and define how the criteria of this model allow us to correctly describe total cross sections and the astrophysical S-factor at astrophysical energies. The energy range of 10 keV to 7.0 MeV is considered but only taking into account the structure of resonances up to 2.0 MeV, as discussed previously [16]. The rate of the reaction is calculated at the temperature range of 0.01 to 10 T9.…”

“…It should be noted that there is no second resonance at 410 keV in the available data [13]. However, it exists in spectra [16,25,26], we are taking it into account. A new resonance at 410 keV not observed in experiment [13] is clearly observed in Fig.…”

Erratum: The Li8(p,α)He5 reaction at low energies, and Mendes1, Lépine‐Szily2, Descouvemont3 et al. 2018Phys. Rev. CSelf Cite2050View full textAdd to dashboardCite

“…Figure 7 contains R-matrix calculations to fit the cross sections of the original paper with parameters shown in Table II of the original paper. We do not refit the corrected data since this fit is overcome by calculations in the new article [2]. Thus, readers should disregard Fig.…”