By A. Gal (auth.), Michel Baranger, Erich Vogt (eds.)

Review articles on 3 subject matters of substantial present curiosity make up the current quantity. the 1st, on A-hypernuclei, was once solicited through the editors as a way to offer nuclear physicists with a basic description of the latest advancements in a box which this viewers has mostly missed or, probably, seen as a novelty within which a extraordinary nuclear approach gave a few information regarding the lambda-nuclear intersection. That view used to be by no means legitimate. The very contemporary advancements reviewed here-particularly these bearing on hypernuclear excitations and the strangeness trade reactions-emphasize that this box offers vital information regarding the versions and significant principles of nuclear physics. The off-shell habit of the nucleon-nucleon interplay is a subject which used to be firstly obtained with a few embarrassment, abuse, and forget, however it has lately won right recognition in lots of nuclear difficulties. curiosity used to be first involved in it in nuclear many-body conception, however it threatened nuclear physicists'comfortable feeling approximately nonrelativistic strength thought, and plenty of doubtless was hoping that it's going to stay purely an esoteric diversion in the many-body cult. within the editors' opinion, this topic is now emi­ nently first rate and a assessment of it certainly well timed. The 3rd subject, nuclear cost distributions, is one that nearly each nuclear physicist believed have been weIl in hand for a few years.

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As mentioned in the introduction, strangeness exchange reactions may favor populating particular coherent excitations in the residual hypernucleus. Nevertheless, a fair distribution over hypernuclear levels is expected which might depict the ground state at the very end of a visible tail of strengths. t In this way a pattern of convergence of BA values pertaining to heavy elements may be established and a formula similar in principle to the nuc1earBethe-Weiszäcker mass formula might emerge. The physical picture behind the concept of "well depth" and its association with binding energies is quite transparent (Wal 60).

39 fm (64d) which for the proton part result in a satisfactory fit to the measured lowenergy Ap cross sections, although the larger magnitude [compared to Eqs. (63a)-(63d)] of the Ap scattering lengths indicates a stronger Ap force. t We note that for the singlet quantities in Eqs. (63a)-(63d) and (64a)-(64d) the interchange p ~ n leads from one set to the other. This is clear from the observaiion that for a spin-spin CSB potential its contribution to BA of jH(J = 0) comes from the singlet Ap state and within the variational calculation described above is constrained to give the same value as a spin-independent CSB potential would yield.

For a wave function of the type tPo({J(r) : s; > = HN E = max max <({J(r) I -TA - ver) I ((J(r) (48)

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