By R. M. Lieder, H. Ryde (auth.), Michel Baranger, Erich Vogt (eds.)
The current quantity reaffirms nuclear physics as an experimental technological know-how because the authors are essentially experimentalists and because the therapy of the themes should be acknowledged to be "experimental." (This isn't 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 catch" is, in contradistinction, a piece of writing touching on one of many oldest branches of nuclear physics-and it brings again one among our earlier authors. The Doppler-shift approach, reviewed via Alexander and Forster, is without doubt one of the very important new experimental suggestions that emerged within the past decade. This overview is meant, intentionally, to explain completely a vintage approach whose attractiveness epitomizes a lot of the fascination which nuclear physics options 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 symbolize that that is top within the first ten volumes. a lot of our readers and such a lot of our authors may be thankful for the excessive criteria which marked his contributions and which frequently elicited additional exertions from the various authors of the series.
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Additional info for Advances in Nuclear Physics: Volume 10
Two important results emerge from the study of 154 Gd and 156 Dy, assuming that these results can be generalized, namely, (i) that backbending arises from the crossing of real bands and (ii) that the yrast band cannot be identified with the gsb beyond the critical angular momentum, so that backbending is a feature of the yrast band rather than the gsb. 4. Properties of High-Spin States in Even-Mass Nuclei Little experimental information exists about the properties of highspin states in general and more specifically about the nature of the crossing band.
For lowspin states (/ ;:S 8) it is a good approximation to assume that in (HI, xn) reactions all the feeding of a given gsb level originates from the preceding member of the gsb. With this assumption it is possible to extract lifetimes up to, but not including, the highest observed level by applying the equations of growth and decay (Dia+ 69). For higher-spin states the presence of R. M. Lieder and H. -::--::-~-~-~-~-~----. 1! _14. lm) Fig. 18. Decay curves for gsb transitions in 164 Yb and its level scheme.
The disadvantage of this method is that it is very time-consuming to accumulate coincidence Phenomena in Fast Rotating Heavy Nuclei 29 spectra of meaningful statistical accuracy for the high-spin transitions (War+ 73b). Lifetime measurements after (particle, xn) reactions using the RD M indicate that the time elapsing between the formation of the compound nucleus and the population of the gsb, the feeding time, is of the order of a few picoseconds (New+ 70). Bochev et a!. 5 psec (see Fig. 18). In lifetime measurements after (particle, xn) reactions, using the DSAM, these feeding times would mask the nuclear lifetimes, so that this method has found no application in the region of the rare-earth nuclei.
Advances in Nuclear Physics: Volume 10 by R. M. Lieder, H. Ryde (auth.), Michel Baranger, Erich Vogt (eds.)