ATOMIC WEIGHT SCALE BASED ON $sup 12$C=12 AND THE NEW ATOMIC WEIGHT TABLES OF THE ELEMENTS AND OF THE NUCLIDES

Journal Article · Sat Sep 01 04:00:00 EDT 1962 · Uspekhi Fizicheskikh Nauk (U.S.S.R.) For English translation of v61 1957-v65 1958 see Advan. Phys. Sci. (USSR)

OSTI ID:4770560

Kravtsov, V A

At the start of the last century Dalton proposed the use of the weight of H as the unit of atomic weights; later Berzelius suggested O as the reference weight. The International Commission on Atomic Weights chose 1/16 of the weight of O as the unit at the start of this century; this was further refined later by Aston, setting O/sup 16/ = 16. Subsequent discovery of the O/sup 17/ and O/sup 18/ isotopes resulted in the creation of separate chemical'' atomic weight and physical'' atomic mass systems; the chemical'' unit was equal 1.000275 x physical'' unit. The problem was repeatedly discussed by the International Union of Pure and Applied Chemistry and the International Union of Pure and Applied Physics. Many proposals were made, taking into account all the nuclides, isotopes, isobars, and istones alike. Gamow and Bethe proposed He/sup 4/ = 4 as reference; Selinov and Dole F/sup 19/ = 19; Nier and Olander C/sup 12/ = 12; the latter considered also O/sup 18/ = 18. R. Birge supported the C/sup 12/ proposal. This mass unit differs from the chemical system's unit only by 0.0043%. Both the IUPAC and the IUPAP recommended adoption of the new system, the unit u of which 1/ 12 of the mass of the nuclide C12. The following factors indicate the correlations: 1 u = (931441 plus or minus 10) kev = 1.000317917 plus or minus 0.00U000017 physical'' (O/sup 16/ = 16) unit = 1.000043 plus or minus 0.000012 chemical'' (0 = 16) unit. The tables calculated by L. Konig, J. Mattauch, and A. Wapstra (Nucl. Phys. 31: 18(1962)) are presented. (TTT)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-17-002302
• OSTI ID: 4770560
• Journal Information: Uspekhi Fizicheskikh Nauk (U.S.S.R.) For English translation of v61 1957-v65 1958 see Advan. Phys. Sci. (USSR), Journal Name: Uspekhi Fizicheskikh Nauk (U.S.S.R.) For English translation of v61 1957-v65 1958 see Advan. Phys. Sci. (USSR) Vol. Vol: 78; ISSN UFNAA
• Country of Publication: Country unknown/Code not available
• Language: Russian

Related Subjects

ATOMS
CARBON 12
ELEMENTS
FLUORINE 19
HELIUM 4
HYDROGEN
ISOBARS
ISOTOPES
MASS
OXYGEN 16
OXYGEN 17
OXYGEN 18
PHYSICS
STANDARDS
TABLES
WEIGHT