Quenching of spin operators in the calculation of radiative corrections for nuclear beta decay

Calculations of the axial-vector component to the radiative correction for superallowed Fermi $0^+ \rightarrow 0^+$ nuclear beta decay are here modified with quenched rather than free-nucleon coupling constants for the axial-vector and electromagnetic interactions with nucleons. The result increases the deduced value of $V_{ud}$ but does not restore unitarity in the CKM matrix.Comment: LaTeX, 7 pages, no figures, TASCC-P-94-1

The biostratigraphy of the Albian and Cenomanian succession in the Ventnor No. 2 borehole, Isle of Wight

This report describes the foraminifera found in the uppermost part of the Gault, Upper Greensand, Glauconitic Marl and West Melbury Marly Chalk of Ventnor No.2 Borehole (the "Carstone of the Isle of Wight" was barren of calcareous microfaunas). Albian foraminiferal zones followed those defined by CARTER & HART (1977), HART et al. (1989, 1990) and HART (2000). Cenomanian zones are those described by WILKINSON (2000). Albian foraminiferal zones 3 to5 were recognised in the Gault and foraminiferal zone 6 and questionable 6a were observed in the Upper Greensand Cenomanian foraminiferal zones BGS1 was present in the Glauconitic Marl and BGS2 and BGS3 were present in the West Melbury Chalk

Convective Ripening and Initiation of Rainfall

This paper discusses the evolution of the droplet size distribution for a liquid-in-gas aerosol contained in a Rayleigh-B\'enard cell. It introduces a non-collisional model for broadening the droplet size distribution, termed 'convective ripening'. The paper also considers the initiation of rainfall from ice-free cumulus clouds. It is argued that while collisional mechanisms cannot explain the production of rain from clouds with water droplet diameters of $20\ \mu {\rm m}$, the non-collisional convective ripening mechanism gives a much faster route to increasing the size of the small fraction of droplets that grow into raindrops.Comment: 6 pages, no figure

Reflections on new policies for early childhood education and care in Scotland

No abstract available