LIGHT ISOTOPES OF BERKELIUM AND CALIFORNIUM (thesis)

Abstract

List of Illustrations 88 List of Tables 90 References 9I LIGHT ISOTOPES OF BERKELIUM AND CALIFORNIUM A. Chetham-Strode, Jr.

Discovery of isotopes of the transuranium elements with 93≤Z≤98

“…241 Am was bombarded with α particles from the Argonne 152 cm cyclotron forming 242 Bk in the (α,3n) reaction. 242 later measurements were only reported in Ph.D. theses [104,105]. Although this assignment was very tentative it is currently being accepted as correct [106].…”

Zr90(d, p)ZrBrient1, Hudspeth2, Bernstein3 et al. 1966Phys. Rev.10010View full textAdd to dashboardCite

“…The DWBA computer program 16 that was used is similar to one described previously 3,4 but differs in that it calculates the real and imaginary potentials independently, and in particular employs a derivative Woods-Saxon form 17 with the neutron real potential form factor the same as that for the proton. In the calculations all radial integrations extend to the origin.…”

“…Indeed, it has been found that the DWBA theory with optical-model wave functions describes the reactions involving heavy targets 3 better than it does those involving lighter targets. 4 This situation is not unexpected since for heavier nuclei the optical model has greater validity and the neglect of compound-nucleus interference and decay is less serious.…”

In-beam spectroscopic study of Cf244

“…These random correlations arise due to the manner in which the search is performed and the finite probability that an unwanted event can occur between the real recoil and α-particle event pair depending on the count rate of the individual pixels in the DSSDs. The half-lives obtained from the fits were A measurement of the electron-capture (EC) decay branch in 244,243 Cf was not possible in this work due to the long half-lives and very low α-decay branching ratios of 244 Bk [26] (T 1/2 = 4.35 (15) h, b α = 6(2) · 10 −3 %) and 243 Bk [27] (T 1/2 = 4.6(2) h, b α = 0.1%). Therefore, an α-decay branching ratio of b α = 14.0 % for 243 Cf that has been estimated in the literature [28,29] using data from [19] and [20] was adopted.…”