Revisiting the even-odd staggering in fission-fragment yields

Abstract

The even-odd staggering observed in the experimental fission-fragment nuclear-charge yields is investigated over a wide systematics of fission fragments measured at Lohengrin in direct kinematics and at GSI in inverse kinematics. The general increase of the even-odd staggering in the fission-fragment charge yields towards asymmetric charge splits is explained by the absorption of the unpaired nucleons by the heavy fragment. As a consequence, the well established trend of evenodd staggering in the fission fragment charge yields to decrease with the fissility is attributed in part to the asymmetry evolution of the charge distribution. This interpretation is strongly supported by the data measured at GSI, which cover the complete charge distribution and include precise yields at symmetry. They reveal that the even-odd effect around symmetry remains constant over a large range of fissility.

Probing Ion Transfer across Liquid–Liquid Interfaces by Monitoring Collisions of Single Femtoliter Oil Droplets on Ultramicroelectrodes

“…Sodium hydroxide monohydrate (NaOH·H 2 O, ≥99.9995%), tetrabutylammonium perchlorate (TBAClO 4 , 99%), and potassium nitrate (KNO 3 ) were purchased from Fluka, ACROS, and Fisher Scientific, respectively. The compound 1,1′,3,3′-tetra­(2-methyl-2-nonyl)­ferrocene (DEC, Figure S1C) was synthesized as described elsewhere . Pt (99.99%, 10 or 25 μm in diameter) wire was obtained from Goodfellow (Devon, PA).…”