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- W1978673240 abstract "I am honored to have this opportunity to recognize the man who started this charge-exchange business. He is, of course, John Anderson. A few days ago our workshop chairman, Peter Jackson, called me and reminded me that this is the 25th anniversary of the discovery of isobaric-analog states (IAS). He asked me to say a few appropriate words. Roughly 25 years ago, John Anderson, the late Calvin Wong, John McClure, and Stewart Bloom made an interesting discovery (1). In fact, it was so interesting that it has not yet been superseded by a more important discovery of nuclear structure. John and his colleagues had set out to measure the systematics of nuclear temperatures. They were to look at the spectra of evaporated neutrons from compound nuclei created by proton bombardment of various targets. The evaporation spectra should be smooth functions of energy. The smooth functions were there, but there was a sharp peak superimposed, as shown in Fig. 1 . (2). No known physical phenomenon could produce the sharp peak, so it had to be an artifact of the electronics. However, John and his colleagues convinced themselves that the time-to-pulse-height converters were working right. Well then, it had to be a contaminant in the target. Sharp peaks had 5 1 been seen for isospin mirror transitions, but this target, ??VZK, had five excess neutrons, so there could not be a mirror transition. The prevailing dogma was that isotopic spin, as it was then called, was a bad quantum number because the Coulomb force was so strong. Well, John and his colleagues set about to calculate the Z of the contaminant mirror transition that would put the sharp peak at the observed energy. They found Z = 23, 600 TARGET I" @default.
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- W1978673240 date "1987-06-01" @default.
- W1978673240 modified "2023-10-14" @default.
- W1978673240 title "Remarks on the occasion of the 25th anniversary of the discovery of isobaricanalog states" @default.
- W1978673240 doi "https://doi.org/10.1139/p87-076" @default.
- W1978673240 hasPublicationYear "1987" @default.
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