The Treiman-Yang Criterion: validating the Trojan Horse Method by experimentally probing the reaction mechanism

Abstract

Abstract. Proper selection of the quasi-free (QF) break-up channel in a three-body reaction is a key aspect for the applicability of the Trojan Horse Method (THM). The TreimanYang (TY) Criterion is a model-independent experimental test for the dominance of the QF mechanism, and hence constitutes one of the strongest validity tests of the THM. An experiment was performed at LNS to apply the test to the d( B 10 , Be 7 α) n reaction. Here, the criterion is described and some preliminary data from the experiment are shown.

Proceedings of the 15th International Symposium on Origin of Matter and Evolution of Galaxies (OMEG15)

“…Preliminary results for the 18 F(n,α)15 N excitation function obtained from18 F(d,α 15 N)p via THM .Note the correspondence of the obtained spectrum with the known α-decaying levels in19 F. The dotted purple ellipse around 1-1.5 MeV roughly indicates a region on19 F excitation energies where no α-decaying levels are expected.…”

“…Shapiro [16]. Recently, the Treyman-Yang criterion as been applied by the Catania group to the d( 10 B; 7 Be,α)n reaction used to study the p( 10 B; 7 Be,α) two body process [18,19]. If the QF mechanism is dominant, the cross section for the three body process can be written e.g.…”

“…The 18 F(p,α) 15 O astrophysical S factor from [13]. The full dots are THM experimental data with the assumption of J π =3/2+ for the resonance at E = 6460 keV in 19 Ne, the open ones correspond to the assumption of J π =5/2 (the difference from this last assumption to the other possible value 1/2 and 3/2 being negligible within the errors). The solid and dashed lines shown in figure are calculations presented and discussed in [20] smeared to the present experimental resolution.…”