Resonance behavior of internal conversion coefficients at low {gamma}-ray energy

Journal Article · Mon Feb 15 00:00:00 EST 2010 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.81.024326· OSTI ID:21386606

Trzhaskovskaya, M B ^[1]; Kibedi, T ^[2]; Nikulin, V K ^[3]

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1. Petersburg Nuclear Physics Institute, RU-188300 Gatchina (Russian Federation)
2. Department of Nuclear Physics, Research School of Physics and Engineering, The Australian National University, Canberra, ACT 0200 (Australia)
3. Ioffe Physical Technical Institute, 26 Polytekhnicheskaya, RU-194021 St. Petersburg (Russian Federation)

A resonance-like structure of internal conversion coefficients (ICCs) at low {gamma}-ray energy (< or approx.100 keV) is studied. Our calculations revealed new, previously unknown resonance minima in the energy dependence of ICCs for the ns shells at E2-E5 transitions. The resonances are the most defined for ICCs in light and medium elements with Z < or approx. 50. It is shown that ICCs may have up to four resonances for outer shells while it has been assumed so far that only one resonance exists. Well-pronounced resonances in ICCs at E1 transition were discovered for the ns shells with n>=2 as well as for the np shells with n>=3 and the nd shells with n>=4 of all elements up to superheavy ones. Simple expressions for approximate values of the E1 resonance energy were obtained which are of importance for determination of the resonance energy range where the interpolation of ICCs taken from tables or databases may give significant errors. The occurrence of resonances in ICCs is explained by vanishing conversion matrix elements under changes of sign. The peculiarities of the behavior of the matrix elements and electron wave functions at the resonance energy are considered. Available experimental ICCs for electric transitions with energies near the expected position of resonances satisfactory agree with our calculations.

• OSTI ID: 21386606
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 81, Issue 2; Other Information: DOI: 10.1103/PhysRevC.81.024326; (c) 2010 The American Physical Society; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
APPROXIMATIONS
COMPUTERIZED SIMULATION
E1-TRANSITIONS
E2-TRANSITIONS
E3-TRANSITIONS
E4-TRANSITIONS
ELECTRONS
ENERGY DEPENDENCE
GAMMA RADIATION
INTERNAL CONVERSION
INTERPOLATION
KEV RANGE 10-100
MATRIX ELEMENTS
MESONS
RESONANCE
SPECTRA
WAVE FUNCTIONS
BOSONS
CALCULATION METHODS
CONVERSION
DECAY
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
FERMIONS
FUNCTIONS
HADRONS
IONIZING RADIATIONS
KEV RANGE
LEPTONS
MATHEMATICAL SOLUTIONS
MULTIPOLE TRANSITIONS
NUCLEAR DECAY
NUMERICAL SOLUTION
RADIATIONS
SIMULATION