Probabilities of monoenergetic pair conversion of nuclear multipoles

Journal Article · Sat Sep 01 04:00:00 EDT 1979 · Sov. J. Nucl. Phys. (Engl. Transl.); (United States)

OSTI ID:5206572

Grechukhin, D P; Soldatov, A A

The probabilities of monoenergetic pair conversion of nuclear ..lambda..L multipoles, accompanied by filling a hole of an (nlj) level of an atomic shell, are expressed in terms of the cross section of the inverse process of nonradiative annihilation of a positron by electrons of the (nlj) level. Earlier calculations by the authors (Sov. Phys. JETP 47, 6 (1978) and 49, 202 (1979); Atom. Energ. Inst. Preprint 2897, 1977) of the cross sections of nonradiative annihilation on K shells of atoms with Z=41, 49, 60, 70, 82, and 92 for the E0, E1, and M1 multipoles are supplemented here by results of a calculation for the K shells of these atoms in the case of the E2 and M2 multipoles, as well as by a calculation of the annihilation factors on the LI, LII, and LIII subshells of the lead atom for all the multipoles indicated above. The calculations were performed for the positron-energy interval E/sub +/=0.55 to 6.5 MeV. The results obtained for the coefficient of monoenergetic pair conversion are in good agreement with recent results of Karpeshin and Sliv (Izv. AN SSSR, ser. fiz. 42, 186 (1972)), who investigated in detail the monoenergetic pair conversion for the K shell of atoms with Z=35, 50, 65, and 84 in the case of E1, M1, and E2 multipoles and in the same energy interval. The Hartree-Fock-Slater relativistic atom electron functions are used.

• Research Organization: I. V. Kurchatov Institute of Atomic Energy
• OSTI ID: 5206572
• Journal Information: Sov. J. Nucl. Phys. (Engl. Transl.); (United States), Journal Name: Sov. J. Nucl. Phys. (Engl. Transl.); (United States) Vol. 30:3; ISSN SJNCA
• Country of Publication: United States
• Language: English

Related Subjects

653001* -- Nuclear Theory-- Nuclear Structure
Moments
Spin
& Models
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANNIHILATION
BASIC INTERACTIONS
ELECTROMAGNETIC INTERACTIONS
ELECTRON PAIRS
ELECTRON-POSITRON INTERACTIONS
ELECTRONIC STRUCTURE
INTERACTIONS
INTERNAL PAIR PRODUCTION
K SHELL
L SHELL
LEPTON REACTIONS
LEPTON-LEPTON INTERACTIONS
MULTIPOLES
NUCLEAR REACTIONS
NUCLEI
PAIR PRODUCTION
PARTICLE INTERACTIONS
POSITRON REACTIONS