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Direct Reactions, In some cases fast moving incident particle while crossing through the nucleus or very close to, the nucleus either picks up one or a few nucleons from thenucleus and keeps on moving in the, forward direction or it loses one or a few nucleons to the nucleus and keep on moving in the, , forward direction., First type of reactions are known as pickup reactions while the second type of reactions are, known as stripþing reactions. Both these reactions together are, direct reactions. The, time of direct reactions is of the, order of, to 10-22 seconds (compared with, reaction time of compound reactions which is ~10-14 to 10seconds). Some of the pickup, reactions are:, , typicalreaction, , 10-2, , 29Co + H, (u, , 2 Sc+2 He, , », , %Fe +, , He, , 2Sc + He, , And some of the stripping reactions are:, , 2 Cu +H»29 Cu+H, 197, , 79 Au +i H > 30Hg+n, Hoo, , known as

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5.6 Nuclear Fusion, The pocess in which, known, , as, , two or, , Nuclear fusion". A, , more, , typical, , light nuclei combine, , reaction, , +176, , It, , must, , be noted that due, , to, , strong repulsive, , kinetic, , energics, , numbeT of, y, , cases, , be obtained in, , an, , To achieve fusion in, , order of, high temperature of the, , availbie, , at, , Sun &, , Stars and, , on, , a, , l0', , to, , cause, , high, , (=10 KeV)., , a, , large, , amount, , fusion process. These, , but their, , scale, the, , °K, , Earth they, , heavv nucleus is, , MeV, , accelerator, , large, , a, , torce between two nuclei,, , of | MeV is needed, of kinetic energv of the order, can, , form, , nuclear fasion is, , represented, , H+H 2He+ +t, , to, , use, , is limited to small, , kinet:c energy is, Such, , large, , high, , provided, , temperature, , may be achieved bv exploding, , a, , is, , tission