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The 30.8 keV ${(1/2)}^{\ensuremath{-}}$ isomeric state in $_{41}^{93}\mathrm{Nb}$ decays by an $M4$ transition to the ${(9/2)}^{+}$ ground state. We have measured the $K$-shell internal conversion coefficient ${\ensuremath{\alpha}}_{K}$ for this transition in order to test the validity of current methods of calculation for a case with relatively low atomic number, low transition energy, and a high value of ${\ensuremath{\alpha}}_{K}$. Taking the fluorescence yield of niobium to be 0.751(4), we obtain ${\ensuremath{\alpha}}_{K}=2.56(9)\ifmmode\times\else\texttimes\fi{}{10}^{4}$, a result that agrees with the Dirac-Fock calculations that take into account the presence of a $K$ vacancy in the final state, and disagrees by 1.7 standard deviations with calculations that ignore the vacancy. We also determine the energy of the isomeric state to be 30.760(5) keV, a fourfold improvement in precision over the currently accepted value.

The E0 transition strength in the 2 2 + → 2 1 + transitions of 58,60,62Ni have been determined for the first time following a series of measurements at the Australian National University (ANU) and the University of Kentucky (UK). The CAESAR Compton-suppressed HPGe array and the Super-e solenoid at ANU were used to measure the δ ( E 2 / M 1 ) mixing ratio and internal conversion coefficient of each transition following inelastic proton scattering. Level half-lives, δ ( E 2 / M 1 ) mixing ratios and γ-ray branching ratios were measured at UK following inelastic neutron scattering. The new spectroscopic information was used to determine the E0 strengths. These are the first 2 + → 2 + E0 transition strengths measured in nuclei with spherical ground states and the E0 component is found to be unexpectedly large; in fact, these are amongst the largest E0 transition strengths in medium and heavy nuclei reported to date.

The L subshell internal conversion coefficient ratios LI/Lir/LIII were determined for the 112.0 kev transition from Lul77 and the 85.1 kev transition from Tbl60 and were found to be

A non-reference based method to determine internal conversion coefficients using the SAGE spectrometer is carried out for transitions in the nuclei of 154 Sm, 152 Sm and 166 Yb. The Normalised-Peak-to-Gamma method is in general an efficient tool to extract internal conversion coefficients. However, in many cases the required well-known reference transitions are not available. The data analysis steps required to determine absolute internal conversion coefficients with the SAGE spectrometer are presented. In addition, several background suppression methods are introduced and an example of how ancillary detectors can be used to select specific reaction products is given. The results obtained for ground-state band E2 transitions show that the absolute internal conversion coefficients can be extracted using the methods described with a reasonable accuracy. In some cases of less intense transitions only an upper limit for the internal conversion coefficient could be given.

Internal conversion electron (ICE) spectra of thin 238,239,240Pu sources, measured with a windowless Peltier-cooled silicon drift detector (SDD), were deconvoluted and relative ICE intensities were derived from the fitted peak areas. Corrections were made for energy dependence of the full-energy-peak counting efficiency, based on Monte Carlo simulations. A good agreement was found with the theoretically expected internal conversion coefficient (ICC) values calculated from the BrIcc database.

We have measured the $K$-shell internal conversion coefficient, ${\ensuremath{\alpha}}_{K}$, for the 88.2-keV $M4$ transition from the 106-day isomer to the ground state in $^{127}\mathrm{Te}$ to be 484(6). When compared with Dirac-Fock calculations of ${\ensuremath{\alpha}}_{K}$, this result agrees well with the version of the theory that incorporates the effect of the $K$-shell atomic vacancy and disagrees with the one that does not. As a byproduct of this measurement, we have determined the $\ensuremath{\beta}$ branching from the isomer to be 2.14(3)%.

A windowless Peltier-cooled silicon drift detector (SDD) was used to measure internal conversion electron (ICE) spectra of thin 241Am sources. The ICE peaks associated with the 59.54 keV gamma transition in 237Np were deconvoluted and relative ICE intensities were derived from the fitted peak areas. Corrections were made for energy dependence of the full-energy-peak counting efficiency, based on Monte Carlo simulations. As expected for this anomalous E1 transition, a significant discrepancy was found with the theoretical internal conversion coefficient (ICC) values calculated from the BrIcc database. Penetration effects are known to cause such anomalies in highly retarded transitions. The measured ICE intensities are in good agreement with a specific combination of literature data obtained with magnetic spectrometers.

In this article, the cross section of different fusion reactions is determined: D(d,p)T, D(d,γ) 4 He,T(d,n) 4 He and D(p,γ) 3 He by considering the lattice effect in internal conversion of solid state in palladium environment which is a face-cubic-centered-structured metal. Fusionable particles are solved as sublattice; these particles contribute in fusion reaction in palladium environment. Fusion reaction is generated by flux of incoming fusionable particles. In order to enter the lattice effect in the fusion cross section for above reactions, It need to use The Bloch function for the initial and final state of threebody system. The Original Research Article Physical Science International Journal, 4(10): 1383-1399, 2014 1384 three body system consists of the host lattice, sublattice and incident particles. Then the new fusion cross sections are compared with ordinary ones. Finally, the internal conversion coefficient is obtained with regarding the lattice effect. The authors strongly discuss that the lattice effect in solid state internal conversion must be considered until the experimental data of fusion cross section have a good justification with theoretical hypothesis.

The heavy actinide nucleus 253No (Z = 102) was studied using the (S)ilicon (A)nd (Ge)rmanium (SAGE) spectrometer allowing simultaneous in-beam $\gamma$ -ray and conversion electron spectroscopy at the accelerator laboratory of the University of Jyvaskyla. Using the recoil-tagging technique, $\gamma$ -electron coincidences have allowed for the extension of the level scheme in the lower-spin region of the yrast band. In addition, internal conversion coefficient (ICC) measurements to establish the multipolarity of transitions have been performed. Measurement of the interband-intraband branching ratios supports the assignment of the Nilsson band-head configuration $9/2^{-}[734]$ assigned in previous studies. The study shows the viability of combined in-beam electron and $\gamma$ -ray spectroscopy down to μb cross sections.

The first excited isomeric state of Th-229 possesses the lowest energy among all known excited nuclear states. The expected energy is accessible with today's laser technology and in principle allows for a direct optical laser excitation of the nucleus. The isomer decays via three channels to its ground state (internal conversion, gamma decay, and bound internal conversion), whose strengths depend on the charge state of Th-229m. We report on the measurement of the internal-conversion decay half-life of neutral (229)mTh. A half-life of 7 +/- 1 mu s has been measured, which is in the range of theoretical predictions and, based on the theoretically expected lifetime of approximate to 10(4) s of the photonic decay channel, gives further support for an internal conversion coefficient of approximate to 10(9), thus constraining the strength of a radiative branch in the presence of internal conversion.

The 2002 version of Nuclear Data Sheets for A = 198 (2002Zh04) has been updated and revised on the basis of the experimental results from various decay and reaction studies before June 2008. The experimental data for all known nuclei of A = 198 (Ir,Pt,Au,Hg, Tl,Pb,Bi,Po,At,Rn) have been reevaluated. The experimental methods, references, Jπ arguments, and necessary comments are given in the text. The theoretical internal conversion coefficient (ICC) (and its associated uncertainty) for γ-rays have been interpolated from theoretical values based on the “Frozen Orbital” approximation (2002Ba85) using the BRICC(v2.2) computer program. Summary band-structure drawings and level schemes from both radioactive decay and reaction studies are presented. Also of special interest are the new levels of 198 Ir, 198 Tl nuclei and identification of new superdeformed bands in 198 Pb and 198 Po.

The high-spin level schemes of odd–odd 100Nb ( Z = 41 , N = 59 ) and 148La ( Z = 57 , N = 91 ) were identified from γ – γ – γ coincidence studies of prompt γ rays in the spontaneous fission of 252Cf with Gammasphere. Spin/parity assignments for the levels in these two nuclei were made based on the low-lying levels assigned in decay work, on the internal conversion coefficient (ICC) measurements and the level systematics of the neighboring isotopes. A K π = 1 + deformed ground-state band was identified in 100Nb. The onset of ground-state deformation in Nb isotopes is found to take place at N = 59 , in contrast to N = 60 for Sr ( Z = 38 ), Y ( Z = 39 ) and Zr ( Z = 40 ) isotopes. Unlike the observation in 99Nb, the N = 56 subshell closure seems to be no longer dominant in 100Nb. The bands observed in 148La are interpreted as aligned coupling of [ π h 11 / 2 υ h 9 / 2 ] low J to the deformed core rotor.

A new internal conversion coefficient database, BrIcc has been developed which integrates a number of tabulations on internal conversion electron (ICC) and electron–positron pair conversion coefficients (IPC), as well as Ω ( E 0 ) electronic factors. A critical review of general formulae and procedures to evaluate theoretical ICC and IPC values are presented, including the treatment of uncertainties in transition energy and mixing ratio in accordance with the Evaluated Nuclear Structure Data File. The default ICC table, based on the Dirac–Fock calculations using the so called “Frozen Orbital” approximation, takes into account the effect of atomic vacancies created in the conversion process. The table has been calculated for all atomic shells and to cover transition energies of 1–6000 keV and atomic numbers of Z = 5 –110. The software tools presented here are well suited for basic nuclear structure research and for a range of applications.

A non-reference based method to determine internal conversion coefficients using the SAGE spectrometer is carried out for transitions in the nuclei of 154Sm, 152Sm and 166Yb. The Normalised-Peak-to-Gamma method is in general an efficient tool to extract internal conversion coefficients. However, in many cases the required well-known reference transitions are not available. The data analysis steps required to determine absolute internal conversion coefficients with the SAGE spectrometer are presented. In addition, several background suppression methods are introduced and an example of how ancillary detectors can be used to select specific reaction products is given. The results obtained for ground-state band E2 transitions show that the absolute internal conversion coefficients can be extracted using the methods described with a reasonable accuracy. In some cases of less intense transitions only an upper limit for the internal conversion coefficient could be given. peerReviewed

Decay properties of neutron-deficient exotic nuclei close to A=80 have been investigated at the IGISOL facility. The studied nuclei, 81Y, 81Sr, 81mKr, 85Nb, 85Zr, 86Mo and 86Nb, were produced by a 32S beam from the Jyvaskyla isochronous cyclotron on 54Fe and natNi targets. The internal conversion coefficient for a 190.5 keV isomeric transition in 81mKr has been measured and the internal transition rate has been determined. The internal transition rate has been used to estimate a neutrino capture rate on 81Br, which yields a log ft of 5.13±0.09 for the reaction 81Br( ν, e-)81mKr. A new isomer with a half-life of 3.3±0.9 s has been observed in 85Nb. The existence of an earlier reported isomer with a half-life of 56 s in 86Nb has not been confirmed.

The γ- and conversion electron spectra following131Ba e-decay are investigated, using HPGe detector and mini-orange electron spectrometer. Attention is particularly focussed on identifying weak transitions associated with low energy high spin levels in131Cs level scheme earlier inferred in reaction studies but not yet observed in131Ba decay. Our experiment identifies 15 new gammas and 6 new conversion lines in this decay. Internal conversion coefficients and multipolarities of several transitions are determined. Five new levels (3 with Iπ = 7/2+ and one each with Iπ 9/2+ and 11/2−) are introduced in the131Cs level scheme based on our observations taken together with the results from reaction studies. Spin-parity assignments to a few other levels are also suggested

(i) The deformation of the nuclear ground state is a fundamental property that can be deduced in even-even nuclei from the B(E2) value for the first 2+ (21+) state. In 1987, we published a compilation of such B(E2: 01+→ 21+) values for ~ 280 even-even nuclei. Very recently, we have updated the 1987 compilation and have compared the adopted B(E2: 01+ → 21+) values (for ~ 330 even-even nuclei) with those given by various theoretical models (Finite-Range Droplet Model, Woods Saxon Model, Relativistic Mean-Field Calculations, Extended Thomas-Fermi Strutinski Integral Method, Hartree-Fock+BCS Calculations, and Dynamical Microscopic Model). Agreement between theory and experiment varies from “reasonable” to “excellent”.(ii) Currently, the most widely used Internal Conversion Coefficient (ICC) compilations are those by Hager and Seltzer, Rosel et al., and Band and Trzhaskovskaya. In all three cases, the calculation of electron wave functions is carried out in the framework of the Hartree-Fock-Slater (HFS) method...

The complex of problems associated with the discrete conversion of gamma rays is considered. The analogue of the internal conversion coefficient is determined for the case of discrete conversion, and specific computations are made. The calculated values of the half-life of the nuclear level Eγ = 35.492 keV in 125TeQ ions (Q = 45–48) are in good agreement with the measured quantities. Computations for the spectrum of optical photons accompanying the de-excitation of the nuclear level Eγ = 3.5 ± 1 eV in 229Th, carried out using the Dirac-Fock multiple configuration method, show that the highest-intensity spectral lines are situated in the region of 2.3–2.4 eV, which is in accord with the experimental data.

There is a significant discrepancy in the reported values for the emission probability of the 186 keV gamma-ray resulting from the alpha decay of 226 Ra to 186 keV excited state of 222 Rn. Published values fall in the range of 3.28 to 3.59 gamma-rays per 100 alpha-decays. An interesting observation is that the lower value, 3.28, is based on measuring the 186 keV gamma-ray intensity relative to the 226 Ra alpha-branch to the 186 keV level. The higher values, which are close to 3.59, are based on measuring the gamma-ray intensity from mass standards of 226 Ra that are traceable to the mass standards prepared by HONIGSCHMID in the early 1930's. This discrepancy was resolved in this work by carefully measuring the 226 Ra alpha-branch intensities, then applying the theoretical E2 multipolarity internal conversion coefficient of 0.692±0.007 to calculate the 186 keV gamma-ray emission probability. The measured value for the alpha branch to the 186 keV excited state was (6.16±0.03)%, which gives a 186 keV gamma-ray emission probability of (3.64±0.04)%. This value is in excellent agreement with the most recently reported 186 keV gamma-ray emission probabilities determined using 226 Ra mass standards.

We have studied the ionic charge state dependence of the nuclear lifetime of the 35.5-keV first excited state of {sup 125}Te. We found for the 47{sup +} and 48{sup +} ions, 400 and 670{percent} variations with respect to the neutral-atom half-life (1.49 ns). These unusually large effects are due to the energetic blocking of the K-shell internal conversion as the charge state increases past 47{sup +}. For the 46{sup +}, we suggest a new internal conversion mode without any electron emission into the energy continuum. {copyright} {ital 1997} {ital The American Physical Society}

The standardization of (111)In by means of a 4πβ-γ coincidence system, composed of a proportional counter in 4π geometry, coupled to a 20% relative efficiency HPGe crystal, for measuring gamma-rays is presented. The data acquisition was performed by means of the software coincidence system (SCS) and the activity was determined by the extrapolation technique. Two gamma-ray windows were selected: at 171 keV and 245 keV total absorption peaks, allowing the determination of the total internal conversion coefficient for these two gamma transitions. The results were compared with those available in the literature.

Isomeric transitions in [sup 69]Se are investigated using charged particle-[gamma] and [gamma]-[gamma] delayed coincidence measurements. A precise three-point angular distribution shows that the decay of the 9/2[sup +] isomer is nearly isotropic, suggesting either significant dealignment during the lifetime of the isomer or a small [ital E]3 admixture in this transition. An improved measurement of the lifetime of the isomer yields a half-life of 960[plus minus]23 ns. The single particle level structure of negative parity states in [sup 69]Se below the 9/2[sup +] isomer is investigated using a recoil shadowing technique. A 39.4 keV gamma ray with a total-internal conversion coefficient of 28.0[plus minus]2.5 is observed deexciting the 5/2[sup [minus]] first excited state, which is found to be isomeric with a half-life of 2.0[plus minus]0.2 [mu]s. The observed lifetime, along with the internal conversion coefficient, suggests [ital E]2 multipolarity for this transition and strongly favors a spin and parity assignment of 1/2[sup [minus]] for the [sup 69]Se ground state.

The internal conversion coefficient for bound-free electron transition of originally energetically forbidden internal conversion processes induced by intense, few-cycle UV laser pulse of Gaussian shape in the case of isomers {sup 107}Ag{sup m} (K shell, E3, 25.47 keV), {sup 90}Nb{sup m} (L{sub 2} shell, M2+E3, 2.3 keV), {sup 183}W{sup m1}(M{sub 5} shell, E2, 1.79 keV), {sup 183}W{sup m2} (N{sub 1} shell, E1, 548 eV), and {sup 188}Re{sup m} (M{sub 2} shell, M3+E4, 2.63 keV), and {sup 235}U{sup m} (O{sub 4} and O{sub 5} shells, E3, 73.5 eV) is determined numerically. Experimental conditions and possibilities of the laser-induced internal conversion process of {sup 183}W{sup m2} from the N{sub 1} shell are discussed in more detail.

The most widely used theoretical internal conversion coefficient (ICC) tables are of Hager and Seltzer (HS), Rosel et al. and BRICC (Band et al. tables using BRICC interpolation code). A rigorous comparison of experimental ICCs with various theoretical tabulations is possible only when a large data on experimental ICCs is available at one place. For this reason, a compilation of all the available experimental ICCs, αT, αK, αL of E2 transitions for a number of elements in the range of 24⩽Z⩽94 is presented. Listing of experimental data includes 595 datasets corresponding to 505 E2 transitions in 165 nuclei across the nuclear chart. Data with less than 10% experimental uncertainty have been selected for comparison with the theoretical values of Hager and Seltzer, Rosel et al. and BRICC. The relative percentage deviation (%Δ) have been calculated for each of the above theories and the average (%Δ¯) are estimated. The Band et al. tables, using the BRICC interpolation code are seen to give theoretical ICCs clos...

The authors have designed a versatile and compact system which allows the simultaneous measurements of alpha - gamma and alpha -eK,L,M angular correlations and hence allows the determination of internal conversion coefficients. The capability of the system is illustrated by applying it to the study of the 227Th to alpha 223Ra* decay.

Precise line-shape analyses of M\"ossbauer spectra using the 58-keV transition in $^{159}\mathrm{Tb}$ have been made using an exact representation of the line shape in transmission. Spectra were made using a ${\mathrm{Dy}}_{2}$${\mathrm{O}}_{3}$ source at liquid-nitrogen temperature and absorbers of ${\mathrm{Tb}}_{4}$${\mathrm{O}}_{7}$ and ${\mathrm{TbAl}}_{2}$ at several temperatures from 81 to 297 K. We have measured the recoilless fraction as a function of temperature between 115 and 297 K for ${\mathrm{TbAl}}_{2}$ and at 81 and 294 K in ${\mathrm{Tb}}_{4}$${\mathrm{O}}_{7}$. If the theoretical value of the internal conversion coefficient of 11 is accepted, we cannot fit our results to a Debye model, even in a rough approximation. The mean lifetime of the first excited state of $^{159}\mathrm{Tb}$ was determined to be 77(1) ps. We have found the value of the interference parameter for this transition to be -0.0058(7), which appears larger in magnitude than predicted by theory.

Using relativistic band structure calculations applying the relativistic linear muffin-tin orbital (RLMTO) method the internal conversion coefficient (ICC) for valence electrons of hcp−99Tc and bcc−235U are calculated. This coefficient describes the probability for a virtual -quantum of energy ħΩ (2.17keV for Tc, 77eV for U) emitted by a nucleus to eject an electron from the valence band (photoelectron emission with the photon source inside the solid). The resulting ICC's are very similar to the corresponding density of states.

The ab-initio electron theory of the internal conversion coefficient (ICC) is developed for the case of pure crystalline metals, the radioactive nuclei of which emit γ-quanta with relatively small energy (≦ keV) exciting thus preponderantly valence electrons. In this case the photon wavelength is large in comparison with the radius of the nucleus and the ICC ( = energy spectrum of the emitted conversion electrons) becomes independent of the properties of the nucleus. For any electric or magnetic transition and using spherically symmetric muffin-tin potentials the ICC is expressed by the characteristic quantitites of the electron making a transition from an occupied valence state to an unoccupied free electron state. The calculations for 110Ag show the ICC to reflect directly the density of states of the valence electrons. Die ab-initio Theorie des inneren Konversionskoeffiienten (ICC) wird fur den Fall reiner kristalliner Metalle entwickelt, deren radioaktive Kerne γ-Quanten mit relativ kleinen Energien emittieren, die folglich vorwiegend Valenzelektronen anregen. In diesem Fall ist die Photonenwellenlange gros im Vergleich zum Kernradius und das ICC ( = Energiespektrum der emittierten Konversionselektronen) wird unabhlangig von den Kerneigenschaften. Fur einen beliebigen elektrischen oder magnetischen Ubergang wird unter Verwendung spharisch-symmetrischer Muffin-tin-Potentiale der ICC durch die charakteristischen Grosen des Elektrons, das einen Ubergang von einem besetzten Valenzzustand in einen unbesetzten freien Elektronenzustand macht, ausgedruckt. Die Berechnung fur 110Ag zeigt, das der ICC direkt die Zustandsdichte der Valenzelektronen widerspiegelt.

Internal conversion coefficients involving atomic electrons (ICC) and electron-positron pairs (IPC) are often required to determine transition multipolarities and total transition rates. A new internal conversion coefficient data base, BrIcc has been developed which integrates a number of tabulations on ICC and IPC, as well as {Omega}(E0) electronic factors. To decide which theoretical internal conversion coefficient table to use, the accurately determined experimental {alpha}{sub K}, {alpha}{sub L}, {alpha}{sub Total} and {alpha}{sub K}/{alpha}{sub L} values were compared with the new Dirac-Fock calculations using extreme assumptions on the effect of the atomic vacancy. While the overall difference between experiment and theory is less than 1%, our analysis shows preference towards the so called ''Frozen Orbital'' approximation, which takes into account the effect of the atomic vacancy.

The activity of a 109Cd solution has been accurately determined without using 109Cd nuclear decay data such as emission probabilities. An ampoule containing this calibrated 109Cd solution was sent to the Bureau International des Poids et Mesures to include the activity result in the database of the International Reference System (SIR). The emission rate of conversion electrons was measured by means of pressurized proportional counters as well as by a liquid scintillation spectrometer. The combination of the results with the photon emission rate measured with the aid of γ-ray spectrometers yields the activity concentration. The measurement results were also used to deduce emission probabilities with high accuracy. For the 88 keV transition, a photon emission probability of p γ = 0.03663 ( 33 ) and a total internal conversion coefficient of α t = 26.30 ( 25 ) were determined.

The 10.5-day isomer in {sup 193}Ir decays by a single 80.2-keV M4 transition directly to the ground state of that nucleus. We have measured the total intensity of K x rays relative to 80.2-keV {gamma} rays for this transition to be 98.7(6). With the K-shell fluorescent yield for iridium taken to be 0.958(4), this result yields {alpha}{sub K}=103.0(8) for the K-shell internal conversion coefficient (ICC). The calculated {alpha}{sub K} for this transition is particularly sensitive to the treatment of the hole that is created by conversion in the atomic K shell. Recent ICC tables, which ignore the hole, yield {alpha}{sub K}=92.0. We demonstrate that calculations incorporating the hole produce values between 99.6 and 103.3 depending on the approximation used. Our result strongly supports the need to include the hole.

The HIGISOL facility has been used to investigate carefully the isomeric transition 228.5 keV in 80Y. We have measured the electron internal conversion coefficient for this transition αK = 0.50 ± 0.07 which gives the value for half-life of “bare” isomeric state T 1/2 = 6.8 ± 0.5 s. The isomeric state should play an important role in the rp-process calculations.

Özet. Süperağır çekirdekler için öncelikli bozunum modları, alfa yayınlanması ve kendiliğinden fisyondur. Diğer bir önemli mod ise, gama yayınlanması ile yarışan, dönüşüm elektron yayınlanmasıdır. Dönüşüm elektronlarının gama ışınlarına oranı olarak bilinen iç dönüşüm katsayıları, teorik ve deneysel nükleer yapı çalışmalarında önemlidir. Bu katsayılar deneysel ve teorik yollarla hesaplanabilmektedir. Ayrıca, bu katsayıların hesaplanması için geliştirilmiş pek çok bilgisayar programı da mevcuttur. Bu çalışmada, Z=126 atom numaralı Unbihexium (Ubh) süperağır çekirdeğine ait dönüşüm katsayıları, düşük geçiş enerji aralığında, E4 ve E5 (elektrik), M4 ve M5 (manyetik) geçişleri için, bir matematiksel model olan yapay sinir ağları metodu kullanılarak elde edilmiştir. Abstract. The primary decay modes for superheavy nuclei are alpha emission and spontaneous fission. Another decay mode is conversion electron emission which competes with the gamma-ray emission. Internal conversion coefficients, which are defined by the ratio of the number of emitted electron to the number of gamma-rays, are important for experimental and theoretical nuclear structure studies. These coefficients can be calculated by many experimental and theoretical ways. Furthermore, there are many computer code for calculations of these coefficients. In this work, the conversion coefficients belonging to the super heavy Unbihexium (Ubh) whose atomic number is 126 were calculated for E4 and E5 (electric), M4 and M5 (magnetic) multipole orders in the transition in low energy range. For the calculations, a mathematical model artificial neural network method was used.

The IC(4) software developed to compare calculated internal conversion coefficients (ICC) has been enhanced by adding new features through the use of Borland Delphi and TeeChart. Particularly, the 3D-graph option enhances the possibilities of analyzing calculated ICC values. For example, the comparison between the results given by three sets of theoretical ICC tables for any arbitrary pair of calculated ICC can be presented in a much clearer manner. Their differences can be displayed as energy vs. atomic number surfaces. Results from the analyses of K-shell and total ICCs for E2, E3, M2, M3, and M4 multipolarity are discussed.

5 pages, 7 figures.-- PACS nrs: 21.10.Tg; 23.20.Nx; 27.50.+e., A careful investigation of the isomeric transition of the long-lived state at 228.5 keV excitation energy in Y-80 has been done. The HIGISOL facility at the Jyvaskyla isochronous cyclotron has been used. We used the electron magnetic transporter to prepare an appropriate source and to measure the electron spectra in clean background conditions. The measured internal conversion coefficient α(K) = 0.50 ± 0.07 allows unambiguous 1(-) identification for the 228.5 keV first excited isomeric state in Y-80. With a "bare" half-life of 6.8 ± 0.5 s found in this work, this state is strongly populated in the rp-process during X-ray bursts and has therefore to be taken into account in X-ray burst model calculations. However, because of the similarity of the β-decay half-lives of isomeric and ground states, we find a maximum reduction in the effective β-decay lifetime of Y-80 of only 17 ± 2%. Our results pave the way for a future investigation of the impact of the isomeric state on the "effective" Y-80 proton capture rate., This work has been supported by the European Union Fifth Framework Programme “Improving Human Potential – Access to Research Infrastructure”. Russian participants express their thanks to the Russian and Finnish Academies for support. One of us (G.K.V.) thanks the CIMO-fund for the granting of his stay at JYFL under grant HAO 033. H.S. is supported by NSF grant PHY-95-28844.