Isomer /sup 235/U(73 eV; 1/2/sup +/): its excitation in electron interactions

Journal Article · Wed Nov 01 04:00:00 EST 1978 · Sov. J. Nucl. Phys. (Engl. Transl.); (United States)

OSTI ID:6023436

Grechukhin, D P; Soldatov, A A

We consider a number of possible mechanisms for populating the isomeric level (73 +- 5 eV; 1/2/sup +/) of /sup 235/U by an E3 transition from the 7/2/sup -/ ground state induced by the Coulomb interaction of an electron with the nucleus. The effectiveness of populating the /sup 235/U isomeric level is estimated in the hypothetical resonance of the nuclear 7/2/sup -/..-->..1/2/sup +/ (h..omega..=73 eV) E/sub 3/ transition with a 5f..-->..6s electron transition in the shell of a uranium atom or ion. Radiation damping of the amplitudes of the electron shell states is taken into account. The inelastic cross section for ee' scattering of electrons by the /sup 235/U nucleus with excitation of the isomeric E3 transition is found by numerical computation. The calculations are made for the range of electron kinetic energies less than 10/sup 3/ eV characteristic of a plasma with temperature T<100 eV. Cross sections are obtained for anticonversion in a shell of the uranium atom or ion resulting in population of the isomeric level of the /sup 235/U nucleus. The calculations are made for systems (U)/sup Q/+1+e with total charge Q=0, 3, and 6. The yield is estimated for the /sup 235/U isomer immersed in a dense plasma with T<100 eV. It is shown that for T< or =20 eV the anticonversion process for populating the isomeric level dominates in ionic systems with charge Q=3--6. The contribution from the neutral component (Q=0) is negligibly small. In the range T>20 eV the contribution from ee' scattering is greater than that from anticonversion for systems with 0

• Research Organization: I. V. Kurchatov Institute of Atomic Energy
• OSTI ID: 6023436
• Journal Information: Sov. J. Nucl. Phys. (Engl. Transl.); (United States), Journal Name: Sov. J. Nucl. Phys. (Engl. Transl.); (United States) Vol. 28:5; ISSN SJNCA
• Country of Publication: United States
• Language: English

Related Subjects

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ALPHA DECAY RADIOISOTOPES
CHARGED-PARTICLE REACTIONS
ELECTRON REACTIONS
ELECTRONIC STRUCTURE
ENERGY RANGE
EV RANGE
EV RANGE 10-100
EVEN-ODD NUCLEI
HEAVY NUCLEI
INELASTIC SCATTERING
ISOMERIC NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LEPTON REACTIONS
MINUTES LIVING RADIOISOTOPES
NUCLEAR REACTIONS
NUCLEI
PLASMA
RADIOISOTOPES
SCATTERING
TARGETS
URANIUM 235
URANIUM 235 TARGET
URANIUM ISOTOPES
YEARS LIVING RADIOISOTOPES