By R. M. Lieder, H. Ryde (auth.), Michel Baranger, Erich Vogt (eds.)
The current quantity reaffirms nuclear physics as an experimental technology because the authors are basically experimentalists and because the therapy of the themes may be acknowledged to be "experimental." (This is not any mirrored image at the theoretical competence of any of the authors.) the topic of high-spin phenomena in heavy nuclei has grown a lot past the belief of "backbending" which gave such an impetus to its learn 5 years in the past. it's a wealthy, new box to which Lieder and Ryde have contributed significantly. the thing "Valence and Doorway Mechanisms in Resonance Neutron seize" is, in contradistinction, an editorial touching on one of many oldest branches of nuclear physics-and it brings again certainly one of our earlier authors. The Doppler-shift approach, reviewed by way of Alexander and Forster, is likely one of the vital new experimental strategies that emerged within the past decade. This overview is meant, intentionally, to explain completely a vintage method whose beauty epitomizes a lot of the fascination which nuclear physics suggestions have held for a iteration of scientists. This quantity concludes the paintings at the Advances in Nuclear Physics sequence of 1 of the editors (M. Baranger), whose judgment and magnificence represent that that's most sensible within the first ten volumes. lots of our readers and such a lot of our authors could be thankful for the excessive criteria which marked his contributions and which regularly elicited additional hard work from the numerous authors of the series.
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Extra info for Advances in Nuclear Physics: Volume 10
10. Backbending plots for 164 • 166 • 168 • 170 Yb. R. M. Lieder and H. Meil 70 72 ~ ~ 74 76 -- N Fig. 11. Summary of present knowledge of the yrast bands in the deformed region, 50 :::::; N, Z :::::; 82, in the form of backbending plots. reached at high-spin states as can be seen in Fig. 10. The irregular backbending behavior of the Yb isotopes has been interpreted by Hartley et al. (Har+ 73) as a level density effect. 29 (Got+ 72). From inspection of the Nilsson level scheme for neutrons, it can be seen that at this deformation a large energy gap exists between the ~- and the i+ orbitals which are filled with 98 and 100 neutrons, respectively.
19 are obtained from such an analysis (Kea+ 74, Lis 75). The dependence on the Coulomb excitation process can be avoided if only those events are accepted in which the incident projectile is scattered at backward angles. In such experiments (Kea+ 74, Lis 75, War+ 75b ), the y-radiation is measured in coincidence with the backscattered ions detected in an annular counter. Further advantages of this method are that the highest recoil velocities are selected and that the peak-to-background ratio is considerably improved in comparison with singles experiments (War+ 75b ).
For the nuclei in this deformed region, a systematic presentation of the back bending effect is given in Fig. I I. The information about the gsb of the nuclei included in Fig. I 1 was taken from the compilation of Sayer eta!. (SSM 75) and additionally from Flaum eta!. (Fla+ 74, Fla+ 76) for 126 •128 Ba and from Ward et al. (War+ 75a) for 128Ce. The back-bending effect observed for these nuclei is especially pronounced. Here, a word of warning should be added. Backbending plots are appropriate only for deformed nuclei.