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Change of the conversion rate of the E 3 isomer /sup 235m/U (76. 8 eV; (1)/(2) /sup +/. -->. (7)/(2) /sup -/) upon variation of the configuration of the valence band of the atomic shell

Journal Article · · Sov. J. Nucl. Phys. (Engl. Transl.); (United States)
OSTI ID:6566712
;
The relativistic Hartree-Fock-Slater method is used to calculate the change of the conversion rate lambda for the E3 isomer (at the transition energy h..omega.. = 77 eV) relative to the value lambda/sub 1/ for the normal atomic configuration (7s (1)/(2) )/sup 2/(6d (3)/(2) )/sup 1/(5f (5)/(2) )/sup 3/ for 14 configurations of the valence band of the atomic shell of uranium including significant variations of the occupation numbers of the 6d, 7s, and 5f orbits. A very strong change ..delta..lambda/lambda/sub 1/ is found to occur upon variation of the occupation number of the 5f orbit (..delta..N(5f)not =0), namely, approx.8% for ..delta..N(5f) = +- 1, which is an order of magnitude greater than the value of ..delta..lambda/lambda/sub 1/ due to the variation of the occupation numbers of other orbits with N(5f) = const. In spite of the fact that the direct contribution of 5f electrons to the conversion is very small (< or approx. =0.1%), a variation ..delta..N(5f) of the occupation number of the well-localized 5f orbit leads to the same change of the screening for the more extended 6p and 6d orbits, which are mainly responsible for the conversion. This cophased effect produces a strong total change ..delta..lambda/lambda/sub 1/ for ..delta..N(5f)not =0. A rigid correlation between the partial conversion rate and the rms radius of the orbit is established for 6p orbits.
Research Organization:
I. V. Kurchatov Institute of Atomic Energy
OSTI ID:
6566712
Journal Information:
Sov. J. Nucl. Phys. (Engl. Transl.); (United States), Journal Name: Sov. J. Nucl. Phys. (Engl. Transl.); (United States) Vol. 38:6; ISSN SJNCA
Country of Publication:
United States
Language:
English

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Related Subjects

652013* -- Nuclear Properties &amp; Reactions
A=220 &amp; above
Theoretical-- Energy Levels &amp; Transitions-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ALPHA DECAY RADIOISOTOPES
CONVERSION
DECAY
E3-TRANSITIONS
ELECTRONS
ELEMENTARY PARTICLES
ENERGY-LEVEL TRANSITIONS
EVEN-ODD NUCLEI
FERMIONS
HEAVY NUCLEI
INTERNAL CONVERSION
ISOMERIC NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOMERIC TRANSITIONS
ISOTOPES
LEPTONS
MINUTES LIVING RADIOISOTOPES
MULTIPOLE TRANSITIONS
NUCLEI
OCCUPATION NUMBER
RADIOISOTOPES
URANIUM 235
URANIUM ISOTOPES
VALENCE
YEARS LIVING RADIOISOTOPES