Orientation of nucleus excited in annihilation of positron on heavy-atom shell. [0. 5 to 6. 55 MeV]

Journal Article · Thu Feb 01 04:00:00 EST 1979 · Sov. Phys. - JETP (Engl. Transl.); (United States)

OSTI ID:5827430

Grechukhin, D P; Soldatov, A A

A calculation is made of the cross sections and orientation spin tensors of a nucleus excited in nonradiative annihilation of a positron by an electron from an (nlj) shell of an atom. Use is made of relativistic wave functions of the electron and positron, obtained by numerical integration of the Dirac equation with a single average Hartree--Fock--Slater atomic potential. The results of calculations of the factors governing the cross sections and orientation of the excited nucleus as a function of the positron energy E/sub +/ = 0.5--6.55 MeV are presented graphically for the series of E0, E1, and M1 multipole transitions in annihilation on the K shell of an atom. The results are given for the atoms with Z=41,49,60,70,82, and 92. Estimates are also obtained for the annihilation of a positron on the L shell of lead (Z=82). The results are used to estimate the cross sections of nuclear excitation in positron annihilation and the angular distributions of the decay products (quanta, fission fragments, etc.) of a nucleus excited in this way. A brief discussion is made of possible applications of low-energy positron beams in nuclear spectroscopy.

• Research Organization: I. V. Kurchatov Institute of Atomic Energy, Academy of Sciences of the USSR, Moscow
• OSTI ID: 5827430
• Journal Information: Sov. Phys. - JETP (Engl. Transl.); (United States), Journal Name: Sov. Phys. - JETP (Engl. Transl.); (United States) Vol. 49:2; ISSN SPHJA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
ACTINIDES
ANGULAR DISTRIBUTION
ANNIHILATION
ATOM COLLISIONS
BASIC INTERACTIONS
COLLISIONS
CROSS SECTIONS
DIFFERENTIAL EQUATIONS
DIRAC EQUATION
DISTRIBUTION
ELECTROMAGNETIC INTERACTIONS
ELECTRONIC STRUCTURE
ELEMENTS
ENERGY-LEVEL TRANSITIONS
EQUATIONS
EXCITATION
FUNCTIONS
HARTREE-FOCK METHOD
INDIUM
INTERACTIONS
K SHELL
L SHELL
LEAD
LEPTON REACTIONS
METALS
NEODYMIUM
NIOBIUM
NUCLEAR ALIGNMENT
NUCLEAR REACTIONS
ORIENTATION
POSITRON COLLISIONS
POSITRON REACTIONS
POSITRON-ATOM COLLISIONS
RARE EARTHS
REFRACTORY METALS
SLATER METHOD
SPIN ORIENTATION
TRANSITION ELEMENTS
URANIUM
WAVE EQUATIONS
WAVE FUNCTIONS
YTTERBIUM