Momentum transfer with light ions at energies from 70 MeV to 1000 MeV

• Published in: Physics letters. B 1982-01, Vol.110 (5), p.372-374
• Main Authors: Saint Laurent, F., Conjeaud, M., Dayras, R., Harar, S., Oeschler, H., Volant, C.
• Format: Article
• Language: English
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/0370-2693(82)91275-8

Angular correlations of fission fragments induced by bombarding a 232Th target with protons, deuterons and alpha particles of energies from 70 MeV to 1000 MeV have been measured. They give information about the forward momentum imparted to the fissioning nuclei. We present the average values of the transferred linear momentum (〈 p ‖〉) as a function of the incident energy and propose a classification into three regimes of dominating processes leading to fission: (i) low-energy behaviour, for E/ A less than 10 MeV/u 〈p ‖〉 p i ∼ 1 . (ii) Between 10 MeV/u and about 70 MeV/u, 〈p ‖〉 p i decreases progressively down to 0.5 but remains proportional to the projectile mass. (iii) The region between 70 MeV/u and about 1000 MeV/u corresponds to a transition region where the projectiles, whatever their masses, tend to transfer the same momentum.