Atomic Physics at Accelerators: Mass Spectrometry: Proceedings of the APAC 2000, held in Carg?se, France, 1923 September 2000 [Hardcover]

The search for examples of proton radioactivity has resulted in the discovery of a large number of proton emitters in the region 50 < Z < 84 [1]. Many of these proton emitters and their daughters are also a-emitters, and in some cases the a-decay chain from the daughter terminates on a nuclide closer to stability whose mass excess is known. This opens up the possibility of using a-and proton-decay Q-values to determine the mass excesses of a large group of nuclei connected by particle decay. The Q-values are derived from the measured kinetic energies of the emitted protons or a-particles. Where the decay chains are not connected to nuclei with known mass excesses, proton separation energies can be measured in some cases and derived in others. For the a-decay ofthe parent nucleus (Z, A) to the daughter (Z - 2, A - 4), the energy and momentum relations used to convert between Q-value, mass (M) and mass excess (ME) are: M(4He)E , (1) M(Z - 2, A - 4)Erecoil, (2) Q , E , + Erecoi\, ME(Z, A) Q , + ME(Z - 2, A - 4) + ME(4He). (3) In practice, one uses M(4He) ~ 4 and M(Z - 2, A - 4) (A - 4), so that Equation (3) becomes ME(Z, A) = E , (_A_) + ME(Z - 2, A - 4) + ME(4He). (4) A -4 Similarly, for protons, we have ME(Z, A) = Ep(_A_) +ME(Z - 1, A-I) +ME(lH).Foreword - organizing APAC2000; D. Lunney. Tutorial on Aspects of Atomic Masses (in honor of the 78th birthday of Aaldert Wapstra). The evaluation of atomic masses; G. Audi. Experimental overview of mass measurements; A. L?pine-Szily. The quest for a microscopic nuclear mass formula; J.M. Pearson. Effects of QED and beyond from the atomic binding energy; G. Soff, et al. Nuclear masses and the r- and p-processes of nucleosynthesis; S. Goriely. Standard-model tests with superallowed beta decay: an important application of very precise mass measurements; J.C. Hardy, I.S. Towner. Memories of mass determinations; A.H. Wapstra. Mass Measurements and Nuclear Structure. Masses and proton separation energies obtainelck