Heavy fragment radioactivity of 238Pu: Si and Mg emission

作者: Shicheng Wang , D. Snowden-Ifft , P. B. Price , K. J. Moody , E. K. Hulet

DOI: 10.1103/PHYSREVC.39.1647

关键词: Plutonium isotopesAlpha decayAlpha particleSpontaneous fissionFissionRadioactive decayAtomic physicsPhysicsBranching fractionHadronic decay

摘要: In addition to its two known hadronic decay modes\char22{}alpha (half-life 88 yr) and spontaneous fission (5\ifmmode\times\else\texttimes\fi{}${10}^{10}$ yr)\char22{}we have found that $^{238}\mathrm{Pu}$ also decays by emission of a Mg nucleus (\ensuremath{\sim}2\ifmmode\times\else\texttimes\fi{}${10}^{18}$ Si (\ensuremath{\sim}6\ifmmode\times\else\texttimes\fi{}${10}^{17}$ yr). This extends four (the other being $^{14}\mathrm{C}$ Ne emission) the number modes fragment mass between an alpha particle resulting from fission. The branching ratios relative are lowest yet observed: \ensuremath{\sim}6\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}17}$ for 1.4\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}16}$ emission.

参考文章(11)
H. J. Rose, G. A. Jones, A new kind of natural radioactivity Nature. ,vol. 307, pp. 245- 247 ,(1984) , 10.1038/307245A0
P. B. Price, J. D. Stevenson, S. W. Barwick, H. L. Ravn, Discovery of radioactive decay of 222Ra and 224Ra by 14C emission. Physical Review Letters. ,vol. 54, pp. 297- 299 ,(1985) , 10.1103/PHYSREVLETT.54.297
E. Hourani, M. Hussonnois, L. Stab, L. Brillard, S. Gales, J.P. Schapira, Evidence for the radioactive decay of 226Ra by 14C emission Physics Letters B. ,vol. 160, pp. 375- 379 ,(1985) , 10.1016/0370-2693(85)90004-8
S. W. Barwick, P. B. Price, J. D. Stevenson, Radioactive decay of U 232 by Ne 24 emission Physical Review C. ,vol. 31, pp. 1984- 1986 ,(1985) , 10.1103/PHYSREVC.31.1984
C. E. Price, G. E. Walker, Self-consistent Hartree description of deformed nuclei in a relativistic quantum field theory Physical Review C. ,vol. 36, pp. 354- 364 ,(1987) , 10.1103/PHYSREVC.36.354
M. Paul, I. Ahmad, W. Kutschera, Search for 34Si ions in 241Am decay. Physical Review C. ,vol. 34, pp. 1980- 1982 ,(1986) , 10.1103/PHYSREVC.34.1980
K. J. Moody, E. K. Hulet, Shicheng Wang, P. B. Price, S. W. Barwick, Search for heavy-ion radioactivity from 241Am. Physical Review C. ,vol. 36, pp. 2710- 2712 ,(1987) , 10.1103/PHYSREVC.36.2710
D.N. Poenaru, W. Greiner, K. Depta, M. Ivascu, D. Mazilu, A. Sandulescu, Calculated half-lives and kinetic energies for spontaneous emission of heavy ions from nuclei Atomic Data and Nuclear Data Tables. ,vol. 34, pp. 423- 538 ,(1986) , 10.1016/0092-640X(86)90013-6
Yi-Jin Shi, W.J. Swiatecki, Estimates of radioactive decay by the emission of nuclei heavier than α-particles☆ Nuclear Physics. ,vol. 438, pp. 450- 460 ,(1985) , 10.1016/0375-9474(85)90385-9