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NucleiFormed in Fission: DecayCharacteristics,
Fission Yields, and ChainRelationships
IssvuED BY THE PLutoNIUM Project’
Introduction
In the year that elapsed between the announcement of the discovery of fission by Hahn and
Strassmann (H2) and the publication of the first
review article by Turner (T4) about 50 radioactive
fission products had been discovered and partl
identified. Continued interest in the fission products is shown by the large numberof entries on
fission product nuclei in the most recent edition
of Seaborg’s Table of Isotopes (S19).
|
The achievementofself-sustainingfission chain-
Publication of Project Information
The scientific contributions of the workers on
the Plutonium Project to this and other fields of ~
scientific knowledge are to be published in series °
of volumes, many of which will be unrestricted in
circulation, to be known as the Plutonium Project
Record (PPR) of the Manhattan Project Technical Series (MPTS). In particular, detailed sur-
veys of the nuclear properties of the fission isotopes, the techniques of radiochemistry, and the
special chemistry of the fission elements are to be
reactors and the operation of these at an indus- given by various Project specialists in Volume 9A
trial level (S150) have increased greatly the scien- of the Plutonium Project Record, Radtochemtstific significance of exact information on fission iry and the Fission Products. The detailed exproducts, and given unique technological imporimcutal work is to be given in the associated
tance to this class of radioactive nuclei. It is ob- Volume OB, Collected Papers on Radiochemistry
vious that a great deal of work on the identifica- and the Fission Products, based on material now
tion, decay energies, chain relationships, fission available only in the manifold secret reports of
yields, and mass assignments was required of re- various sections of the Project.
search groups associated with the Plutonium ProjThe preparation of these two volumes for pubect. Studies have been made directly or indi- lication is a tremendous task since it includes exrectly on nearly ail of the 160 radioactive fission tensive compilation, rewriting, and cross-comproducts now recognized, and much of this work parison with other PPRvolumes. Since this
represents new contribution to scientific knowl- work can hardly be completed before the spring
edge. This article presents in tabular form there- of 1947, it has been deemed advisable to make
sults of a comprehensive survey of Project reports the key information on the fission product nuand scientific journals available as of June 1, 1946. clei available in advance of the main body of
(1) This survey wae prepared by J. M. Begel, based partly on . information.
previous oves circulated on the Plutoninm Project prepared by
A fair distribution of credit to workers of the
Coryell (C116), Coryell and Brady (C116), Brady and Turkevich
Project
presents a problem for this type of publi(8120), Winsberg aod Sugarman (W121), Cleodenio, Siegel, and
Coryell (146), aad Seaborg and Kobman (8140) basea on the un- cation since a large number of people in different
classified general tables of Beaborg (619), Certain refereuces (129,
subdivisions of the Project have made direct conT101) have bees made available through courtesy of the National
tributions of data for the table. Many more have
Research Council of Casada. Reprints of this survey may be obcontributed
indirectly in physical and chemical
taloed by writing; Plutonium Project File, The American Chemical
studies that made the work significant or even
Society, 1165 16th &., Washington 6, D. C.
241 1