[en] Short communication

[en] The mean stable carbon isotope record spanning the years 1847-1973 of three Tasmanian trees is presented along with the mean temperature record of seventeen meteorological stations in south-east Australia. The variations in delta¹³C within single tree growth rings and also in tree seedlings grown under a range of controlled temperatures are presented. It is concluded that the correlation observed between the trees' delta¹³C record and temperature cannot be completely explained by the effect of temperature on the photosynthetic processes occurring in the tree. Two other possible mechanisms that provide an indirect link between the delta¹³C record and temperature are discussed.(auth.)

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[en] In this work the existence of five new T/sub z/ = +⁵/₂ nuclides, ²³F, ²⁹Mg, ³¹Al, ³³Si, and ³⁵P, was established; their properties, including mass values, were determined, along with those of ²⁵Ne and ²⁷Na. Two experimental techniques were used, the ''rabbit'' transfer of a solid target and the gas transfer system; some novel features of these are described. A β spectrum of ³³Si observed in coincidence with 1848-keV γ rays is shown; a mass excess of -20569 +- 50 keV was derived for ³³Si. Attempts to produce ²¹O were unsuccessful. Comparisons of the measured masses of the T/sub z/ = +⁵/₂ nuclides in the 2s--1d shell with predictions of the Garvey--Kelson mass formulation and with shell-model calculations are shown. The latter produce considerably better agreement with experiment. (3 figures, 1 table) (U.S.)

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