Quasifree processes in the3H+2H→d+d+n reaction

Abstract

The quasifree scattering and reaction processes in the 3H + 2H ~ d ~ d + n interaction leaving a neutron as a spectator have been investigated at incident triton energies around 35 MeV. The results compare well with the predictions from Plane Wave Impulse Approximation, arbitrarily normalized to the data. The final energy prescription was used.

Applications of the Trojan Horse method in nuclear astrophysics

“…It should be stressed that THM has its scientific background in the theory of the direct reaction mechanisms [19] the studies of the QF reaction mechanisms (see i.e. [20][21][22][23][24]), and it is an extension of the measurements of the excitation function of the three-body cross sections for QF reaction, at low energies [25][26].…”

At the origins of the Trojan Horse Method

“…The coincidence detection of two of the outgoing alpha particles showed that, in addition to the usual sequential decay through states of 8 Be, another mechanism contributed to the spectra, giving place to a bump centered at the minimum momentum of the undetected alpha. Angular correlations and energy sharing spectra showed that the shape of this bump was consistent with a contribution of the 5 He( 3 He, α) 4 He virtual reaction occurring in the frame of a quasi-free process.…”

“…Of course no comparison with the free cross section could be done in the case of the 5 He( 3 He, α) 4 He reaction, due to the unbound nature of 5 He. Other light systems were experimentally studied in the following years (see for instance [5][6][7][8] and references therein), possessing in the entrance channel projectile or target with a marked ground state cluster structure, like 6 Li and 2 H and indication of a quasi-free mechanism was found in many cases. The case of the 6 Li( 6 Li, 2α) 4 He reaction [9] was particularly interesting since the α-d momentum distribution in 6 Li could be measured within the same experiment by selecting alternatively the events corresponding to the quasifree mechanism with the spectator either in the target or in the projectile.…”