The resonance levels for neutron capture IV1): Overlapping of levels

✍ Scribed by G Diemer; D Coster; Hl de Vries; H Groendijk

• Publisher: Elsevier Science
• Year: 1943
• Weight: 470 KB
• Volume: 10
• Category: Article
• ISSN: 0031-8914
• DOI: 10.1016/s0031-8914(43)90017-5

✦ Synopsis

In part III we found the Cu 5 min resonance neutrons to be strongly absorbed in Ag and Cd. These striking anomalies have been the subject of our present investigations. The results are:

1 °. The large absorption coefficients of Cd and Ag for Cu 5 rain resonance neutrons must be ascribed to the overlapping of a resonance level of Cu, with one of Cd and at the same time with one of Ag. 2 °. The resonance energies involved are : Cu-a level 135 (4-15) eVolts. Ag-b level 125 (4-15) ,, Cd level 145 (4-15)

,, 3 °. The Cu 5 min resonance activity must be ascribed to the contribution of at least three groups of neutrons; they are Cu-a (E r -----135 eV), Cu-b (very high energy: Er:> 1000eV) and some group of low energy.

The latter has presumably to be ascribed to the 1/v region above the cadmium cut-off corresponding to a level of a small negative energy.

4 °. The isotopes responsable for the overlapping are: 65Cu (5 min); 1°gAg (22 sec) ; that of Cd is not yet known.