663 



TABLE 719.— ATOMIC WEIGHTS AND OTHER CHARACTERISTICS OF ISOTOPES 



(concluded) 



2 « References: a, Tollestrup, Fowler, and Lauritsen, Phys. Rev., vol. 78, p. 372, 1950. b, Bethe, H. A 



Elementary nuclear theory, John Wilev & Sons, Inc., 1947; Rasetti, F.. Elements of nuclear physics. Prentice 

 Hall, Inc., 1936; Poss, H. L., Phys. Rev., vol. 75, p. 600, 1949. c, Harvey. J. A., Bull. Amer. Phys. Soc. 

 vol. 25, p. U4, 1950. d. Stern, M. O., Rev. Mod. Phys.. April 19.49. e, Wapstra, A. H.. Phvsica, vol. 16 



p. 33, 1950. f, Perlman, I., Ghiorso, A., and Seaborg, G. T., Phys. Rev., vol. 77, p. 26, 1950; Kinsey, B. B. 



et al., Phys. Rev., vol. 78, p. 77, 1950; also private communications; Hanson, et al., Phys. Rev., vol. 76, p. 578 

 1949. g, Ramsey, Norman, Experimental nuclear physics (forthcoming), John Wilev & Sons. Inc. 



Note added in proof, 1953. — Because of recent mass measurements, the mass of P!> 20 ° should be taken as 

 206.03859. All mass values should be lowered 0.00660 mass units. See Stone, Martin O., Rep. Univ. California 

 Radiation Lab., April 1952. 



* / = spin. **Quadrupole moment = — 0.4. t (10" 24 cm 2 ). t Radioactive series. § Prepared by 



J. A. Harvey, Massachusetts Institute of Technology (see footnote 223, above, reference c). 



SMITHSONIAN PHYSICAL TABLES 



