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

ISBN-10: 147574398X

ISBN-13: 9781475743982

ISBN-10: 1475744005

ISBN-13: 9781475744002

Review articles on 3 issues of substantial present curiosity make up the current quantity. the 1st, on A-hypernuclei, was once solicited via the editors as a way to offer nuclear physicists with a normal description of the newest advancements in a box which this viewers has principally missed or, possibly, considered as a novelty within which a extraordinary nuclear process gave a few information regarding the lambda-nuclear intersection. That view was once by no means legitimate. The very contemporary advancements reviewed here-particularly these bearing on hypernuclear excitations and the strangeness alternate reactions-emphasize that this box presents vital information regarding the versions and critical principles of nuclear physics. The off-shell habit of the nucleon-nucleon interplay is a subject which used to be at the beginning bought with a few embarrassment, abuse, and overlook, however it has lately won right consciousness in lots of nuclear difficulties. curiosity used to be first eager about it in nuclear many-body thought, however it threatened nuclear physicists'comfortable feeling approximately nonrelativistic capability idea, and plenty of without doubt was hoping that it'll stay in simple terms an esoteric diversion in the many-body cult. within the editors' opinion, this topic is now emi nently decent and a evaluate of it certainly well timed. The 3rd subject, nuclear cost distributions, is one that nearly each nuclear physicist believed were weIl in hand for a few years.

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**Example text**

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. The latter, however, receives a contribution for the state mentioned above from the An inter action, and since it is spin independent, the An singlet contribution for this potential equals the Ap singlet contribution for the former CSB potential.

Hypernuclei eigenfunctions in the set of equations dealt with can only improve this bound. We point out that for a spin-independent central AN interaction, the nuclear states i =I=- 0 of Eq. (49) are connected with the nuclear ground state i = 0 only if these excited states involve an excitation to a higher nuclear shell. This necessarily involves exciting the A from a ls state generated by v to a higher single-particle state. It is thus reasonable to expect good results form the rigid core approxirnation, not only for jHe, where the first nuclear excitations are above 20 MeV, but also for some of the p-shell hypernuclei, where all the low-lying nuclear core levels are weil described in terms of a (lp)A -S configuration.

O)} (55) There are several drawbacks in the app1ication of HF equations to hypernuclear BA values. Center-of-mass correction for light systems, projection of a definite angular momentum, and isospin are effects involving a few MeV or less that are not considered or are ill treated in a standard HF calculation. It is not obvious that these effects cancel out for a BA value, namely for a difference between two binding energies in the nuclear and hypernuclear cases, respectively. 5 MeV, Strong Interactions in A-Hypernuclei 37 it is difficult to ascribe a physical meaning to BA values obtained in HartreeFock calculations.

### Advances in Nuclear Physics: Volume 8 by A. Gal (auth.), Michel Baranger, Erich Vogt (eds.)

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