Thorium dispenser cathode

✍ Scribed by D.L. Goldwater; W.E. Danforth

• Publisher: Elsevier Science
• Year: 1956
• Tongue: English
• Weight: 70 KB
• Volume: 262
• Category: Article
• ISSN: 0016-0032
• DOI: 10.1016/0016-0032(56)90569-5

✦ Synopsis

With gaseous sources of Se76 in the form of selenium oxide, resonance scattering from the 265 kev leve1 in As'~ has been observed.'

Preliminary measurements indicate an isotopie distribution of the resonance radiation and thus favor assignment of spin 1/2 to the 265 kev leve1 in As'~. Self-absorption experiments indicate a mean life of 10~l1 second for the 265 kev transition. Although this lifetime is one order of magnitude longer than the prediction of the single particle model,2 it is considerably shorter than most Ml lifetimes.3 * Assisted by the joint program of the ONR and AEC. l For the disintegration scheme of S+, see, for example, A. W.