By Igal Talmi (auth.), Robert E. Chrien, Walter R. Kane (eds.)
The put up international struggle II period witnessed a massive progress within the examine performed in neutron-induced reactions and particularly in neutron catch y-ray reviews. This progress used to be prompted via the supply of neutron assets, akin to reactors and accelerators, and via the improvement of excessive answer y-ray and conversion electron detectors. at the present time the combo of excessive flux reactors and certain instrumentation has produced spectral info of remarkable caliber, because the pages of those complaints illustrate. The world-wide group of the practioners of the artwork of cap ture y-ray spectroscopy has met thrice within the final decade: the 1st overseas symposium in this topic was once held at Studsvik, Sweden in 1969, and the second one at Petten, The Netherlands in 1974. A smaller assembly, of typically u. S. and a few ecu parti cipation, was once held at Argonne nationwide Laboratory in 1966. A perusal of the court cases of those conferences indicates the amazing advert vances during this now mature box of physics during the last dozen years. each one assembly has visible a small yet perceptible elevate within the variety of papers awarded and the variety of laboratories repre sented. extra importantly, every one assembly has documented the expanding effect of (n,y) reasearch, not just on different components of simple physics, but in addition on advertisement and clinical purposes of this know-how. a complete of 29 invited papers and ninety seven contributed papers have been awarded at this symposium.
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Additional info for Neutron Capture Gamma-Ray Spectroscopy
2 E (MeV> 2 Til. Exp. ----IO~--~I4~~~ Neutron Number Fig. 7. Typical features of the transitional class AB. Energies. 8& 90 94 Neutron Number II Fig. B. Typical features of the transitional class AB. Electromagnetic transition rates. IACHELLO One may inquire at this stage what is the relationship between the interacting boson model and the geometrical description of Bohr and Motte1son l • Although the former describes a finite system (N;oo) while the latter refers to an infinite system (the liquid drop), it is possible to find some approximate relationship.
It is only for the present, much more difficult problem that we bring to bear the full power of the boson model. States of nuclei with both valence protons and valence neutrons can be simply constructed from states of the valence protons coupled I. TALMI 16 to states of the valence neutrons. We have considered above a set of states for the protons (or the neutrons) for which a correspondence can be established with boson states. It turns out that the states of the proton neutron system strongly admixed by the quadrupolequadrupole interaction are precisely those constructed from the boson-like states of the protons coupled to boson-like states of the neutrons.
Phys. (N. ) . 9. F. A. Cizewsk~ Phys. Lett. 79B (1978) 5. 10. o. Castanos, E. Chacon, A. Frank and M. Moshinski, to be published in J. Math. Phys. II. I. Talmi, Nucl. Phys. AI72 (1972), 1. S. Shlomo and I. Talmi, Nucl. Phys. AI98 (1972), 81. 12. A. Arima, T. Otsuka, F. Iachello and-r:-Talmi, Phys. Lett. 66B (1977), 205. T. Otsuka, A. Arima, F. Iachello and I. Talmi, Phys. Lett. 76B (1978), 141. T. Otsuka, A. Arima and F. Iachello, to be published in Nucl. Phys. 13. T. Otsuka and o. Scholten, KVI-Ann.