Nuclear excitation during positron annihilation in the K shell of heavy atoms

Journal Article · Sun Jan 01 04:00:00 EST 1978 · Sov. Phys. - JETP (Engl. Transl.); (United States)

OSTI ID:6473254

Grechukhin, D P; Soldatov, A A

The excitation of a nucleus by a positron beam during the annihilation of the positrons with atomic electrons is discussed. Results are reported of a calculation of the excitation cross section for In/sup 115/ and U/sup 235/. The calculations were performed in the transition current and charge scheme, using wave functions obtained by the relativistic Hartree-Fock-Slater method through a numerical integration of the Dirac equation. The Weisskopf single-particle nuclear transition matrix elements were used for In/sup 115/ to estimate the cross section for the nuclear E1 transition induced by a monochromatic positron beam. The cross section at resonance is found to be sigma/sub res/(E1) approx.10/sup -25/ cm/sup 2/. A similar calculation for U/sup 235/ yielded sigma/sub res/ (E1) approx.5 x 10/sup -26/ cm/sup 2/. More accurate cross sections have been obtained for particular levels on the basis of existing experimental data on the nuclear-level spectrum.

• Research Organization: I. V. Kurchatov Institute of Atomic Energy, Academy of Sciences of the USSR, Moscow
• OSTI ID: 6473254
• Journal Information: Sov. Phys. - JETP (Engl. Transl.); (United States), Journal Name: Sov. Phys. - JETP (Engl. Transl.); (United States) Vol. 47:1; ISSN SPHJA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ACTINIDES
ALPHA DECAY RADIOISOTOPES
ANNIHILATION
ATOM COLLISIONS
BASIC INTERACTIONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
COLLISIONS
CROSS SECTIONS
DIFFERENTIAL EQUATIONS
DIRAC EQUATION
E1-TRANSITIONS
ELECTROMAGNETIC INTERACTIONS
ELECTRONIC STRUCTURE
ELEMENTS
ENERGY-LEVEL TRANSITIONS
EQUATIONS
EVEN-ODD NUCLEI
FUNCTIONS
HARTREE-FOCK METHOD
HEAVY NUCLEI
HOURS LIVING RADIOISOTOPES
INDIUM
INDIUM 115
INDIUM ISOTOPES
INTERACTIONS
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
K SHELL
METALS
MINUTES LIVING RADIOISOTOPES
MULTIPOLE TRANSITIONS
NUCLEI
ODD-EVEN NUCLEI
POSITRON COLLISIONS
POSITRON-ATOM COLLISIONS
RADIOISOTOPES
RESONANCE
URANIUM
URANIUM 235
URANIUM ISOTOPES
WAVE EQUATIONS
WAVE FUNCTIONS
YEARS LIVING RADIOISOTOPES