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The use of an on-line mass spectrometer to make direct mass measurements of short-lived isotopes far from the stability line has been improved to yield more accurate mass measurements for ' ' Na, new mass measurements for "Li, ""Na, and to remove a discrepancy between existing mass measurements of "Na. The mass excesses (keV) measured are: "Lj

This paper is the first of two parts presenting the result of a new evaluation of atomic masses (AME2003). In this first part we give full information on the used and rejected input data and on the procedures used in deriving the tables in the second part. We first describe the philosophy and procedures used in selecting nuclear-reaction, decay, and mass spectrometric results as input values in a least-squares evaluation of best values for atomic masses. The calculation procedures and particularities of the AME are then described. All accepted data, and rejected ones with a reported precision still of interest, are presented in a table and compared there with the adjusted values. The differences with the earlier evaluation are briefly discussed and information is given of interest for the users of this AME. The second paper for the AME2003, last in this issue, gives a table of atomic masses, tables and graphs of derived quantities, and the list of references used in both this evaluation and the NUBASE2003 table (first paper in this issue).

The y activities from the P decay of Na isotopes up to "Na, which are formed in high-energy fragmentation and analyzed through mass spectrometry techniques, are observed, as well as those from their Mg or Al descendants. Their intensities are measured, in most cases, in absolute value. The radioactive halflives of ' Mg, ' Mg, and "Mg are determined. Delayed-neutron branching ratios P"are measured for ' Na, '"Na, and "Na. In some cases, partial branching ratios to excited states of the daughter nucleus are also measured. The most prominent y ray in the P decay of even Na isotopes is assigned to 2+~0+ transition in the daughter Mg isotopes, The position of the first excited 2+ level is therefore deduced for ' Mg and "Mg.For ' Mg, the excitation energy drops markedly. It is taken as an indication of a stronger deformation for that isotope.HADlpAC T~1Tg 27-~2Na~3 Mg, SiAl; measured T &y» E» p~c oin; deduced I~, Ip, P".

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The EPR-type strangeness correlation in the K K system produced in the reaction pp ™ K K at rest has been tested using the CPLEAR detector. The strangeness was tagged via strong interaction with absorbers away from the creation point. The results are consistent with the QM non-separability of the wave function and exclude a spontaneous wave-function Ž . factorisation at creation CL ) 99.99% . q 1998 Elsevier Science B.V.