Boron depletion: indirect measurement of the 10B(p,α)7Be S(E)-factor

ASTROPHYSICAL IMPACT OF THE UPDATED9Be(p,α)6Li AND10B(p,α)7Be REACTION RATES AS DEDUCED BY THM

“…However, due to the action of both Coulomb barrier and electron screening effects, the S(10 keV)-factor was only extrapolated from the high energy measurement (Angulo et al 1999). To bypass extrapolations, a first THM measurement has been discussed in Lamia et al (2007), where the dominance of the QF reaction mechanism intervening in the 2 H( 10 B, α 7 Be)n has been constrained via the study of the experimental momentum distribution. The work reports on the 2 H( 10 B, α 7 Be)n experiment performed at USP (University of Sao Paulo, Brazil) by means of a 24 MeV 10 B beam hitting a 190 μg cm −2 thick Figure 2.…”

“…The 10 B(p,α) 7 Be has been studied in the work of Lamia et al (2007) and recently in Spitaleri et al (2014), in order to measure the corresponding S(E)-factor value by means of THM applied to the QF reaction 2 H( 10 B, 7 a Be)n. The investigation allowed us to measure the S(E)-factor in correspondence with the Gamow energy region in which the 8.701 MeV level of 11 C intervenes as an l = 0 resonance at ∼10 keV dominating the whole excitation function from ∼100 keV's down to zero. The S(E)-factor values measured are S(10 keV) = 3127 ± 583 (MeV b) and U e = 240 ± 200 eV, with this last value being strongly affected by the still present uncertainties on direct measurements at which THM data have been normalized (see the discussion in Spitaleri et al 2014).…”

Updated evidence of the Trojan horse particle invariance for the2H(d,p)3H reaction

“…In the last decades strong efforts were devoted to the development and application of indirect methods in nuclear astrophysics. Among the most used indirect methods, an important role is played by the Trojan Horse Method (THM) which has been applied to several reactions in the past decade [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] at the energies relevant for astrophysics (typically smaller than few hundred keV's), which usually are far below the Coulomb barrier, of the order of MeV's. Many tests have been made to fully explore the potentiality of the method and extend as much as possible its applications: the target/projectile break-up invariance [18], the spectator invariance [19,20] and the possible use of virtual neutron beams [21,22].…”

AN UPDATED6Li(p, α)3He REACTION RATE AT ASTROPHYSICAL ENERGIES WITH THE TROJAN HORSE METHOD

“…The THM cross section represents the bare-nucleus cross section, as extensively discussed by Spitaleri et al (2004Spitaleri et al ( , 2011. The application of the THM has shed light on different astrophysical problems, including the study of light element burning reactions (Pizzone et al 2003;Romano et al 2006;Lamia et al 2007Lamia et al , 2008Lamia et al , 2012bLamia et al , 2012cTumino et al 2011aTumino et al , 2011b, CNO reactions (see La Cognata et al 2005Sergi et al 2010;La Cognata et al 2010, and removing/producing neutron reactions Lamia et al 2008;Gulino et al 2010Gulino et al , 2012La Cognata et al 2012). …”