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  • 1
    Electronic Resource
    Electronic Resource
    Secondary elastic crack tip stresses which may influence very slow fatigue crack growth (2002)
    Oxford, UK : Blackwell Science Ltd
    Fatigue & fracture of engineering materials & structures 25 (2002), S. 0 
    Details
    ISSN: 1460-2695
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Secondary elastic crack tip stress intensity factors are defined in a convenient way consistent with the primary stress intensity factor definition. Methods of evaluation of these secondary stress intensity factors are developed. They are evaluated for example configurations with cracks. It is shown that the first secondary term may be sufficient to evaluate the effects of secondary stresses beyond the usual stress intensity factor and nominal normal stresses parallel to the crack direction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1460-2695.2002.00559.x
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  • 2
    Electronic Resource
    Electronic Resource
    Near threshold fatigue crack growth versus long finite life (2002)
    Oxford, UK : Blackwell Science Ltd
    Fatigue & fracture of engineering materials & structures 25 (2002), S. 0 
    Details
    ISSN: 1460-2695
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A brief review of the discovery of the fatigue crack growth threshold is provided with a discussion of the main variables, Kmax and ΔK, which control the threshold over the low and high load ratio ranges, respectively. The significant effect on near threshold growth rates as illustrated by Donald are shown, for an example the aluminium alloy, 2324-T39. Attention is then turned to the ‘partial closure model’ as a means of correlating near threshold fatigue crack growth rates. This seems to be the most promising model with a physical basis. For this reason, the discussion goes on to present a new theoretical analysis of the load displacement record characteristics, which should accompany ‘partial closure’ of fatigue cracks. In addition it is concluded that secondary stress effects should be explored for near threshold fatigue crack growth rates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1460-2695.2002.00560.x
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  • 3
    Electronic Resource
    Electronic Resource
    Excited states of 154Tm (2002)
    Springer
    The European physical journal 14 (2002), S. 7-11 
    Details
    ISSN: 1434-601X
    Keywords: PACS. 21.10.Pc Single-particle levels and strength functions – 23.20.Lv Gamma transitions and level energies – 27.70.+q 150 ?A? 189
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: A high-spin level structure of the nucleus 154Tm has been established for the first time up to 6.14 MeV. The 118Sn + 40Ca reaction at 205 MeV associated with the recoil shadow method was used to identify the I π = (19)+ isomeric state at 2.74 MeV. In-beam γ-ray and conversion electron spectroscopy have been applied on the 144Sm(14N, 4n)154Tm reaction at 95 MeV to build the level scheme. The level structure of 154Tm is compared to other structures observed in N = 85 neighbouring nuclei.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epja/iepja1363
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  • 4
    Electronic Resource
    Electronic Resource
    Level structure of Cs observed from Ba decay and described using the IBFM and CQPC models (2000)
    Springer
    The European physical journal 8 (2000), S. 41-58 
    Details
    ISSN: 1434-601X
    Keywords: PACS. 21.10.Re Collective levels – 23.20.Lv Gamma transitions and level energies – 23.20 Nx Internal conversion – 21.60.Ev Collective models – 27.60.+j 90 ≤A≤ 149
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The decay of 123Ba to 123Cs has been studied with mass-separated sources. Singles spectra of -rays, X-rays and conversion electrons as well as , , and X-e-t coincidences were recorded. A level scheme of 123Cs has been constructed including 26 new excited states and 82 transitions. The existence of a I =11/2-, T =1.7 s isomer, bandhead of the h band, is confirmed. Its excitation energy equals 156.3 keV. A new T =114 ns isomer has been established at 232 keV using the in-beam recoil catcher technique. It is assigned to the I =9/2+ bandhead of the g band. Collective bands based on the 1/2+ ground state and first 3/2+ excited state are proposed. The level structure is described in the frame of the interacting boson-fermion and core-quasiparticle coupling models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100530050007
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  • 5
    Electronic Resource
    Electronic Resource
    New investigation of the decay of the high-spin isomer in 151Er (2000)
    Springer
    The European physical journal 8 (2000), S. 451-454 
    Details
    ISSN: 1434-601X
    Keywords: PACS. 21.10.Pc Single-particle levels – 23.20.Lv Gamma transitions and level energies – 23.20.Nx Internal conversion and extranuclear effects – 27.70.+q 150?A?189
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The decay of the T 1/2 = 420 ns isomer in 151Er has been reinvestigated. The multipolarities of the decaying transitions have been established by measuring the electron conversion coefficients. An I = 67/2- assignment is proposed for this isomer with a π[h 4 11/2 d 1 3/2 d -1 5/2] ⊗ν[f 7/2 h 9/2 h -1 11/2] configuration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100530050055
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  • 6
    Electronic Resource
    Electronic Resource
    New insight in the level structure of 153Er (2000)
    Springer
    The European physical journal 7 (2000), S. 149-153 
    Details
    ISSN: 1434-601X
    Keywords: PACS: 21.10.Pc Single-particle levels – 23.20.Lv Gamma transitions and level energies – 27.70.+q 150 ≤ A ≤ 189
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The high-spin level structure of the 153Er nucleus has been reinvestigated by in-beam γ-ray and electron spectroscopy with (14N,pxn) reaction. Excitation energies, spin and parity assignments are unambiguously established for the two lowest isomers T 1/2≃ 380 ns and T1/2\simeq 10 ns. The characteristics of the third one (T 1/2≃ 250 ns) at 5.2 MeV are still questionable but its main decay modes are better known. An extension of the level scheme is proposed up to 8.4 MeV.Experimental results have been discussed in terms of shell model multiplets and compared with the other structures observed in N=85 neighbouring nuclei.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00013591
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  • 7
    Electronic Resource
    Electronic Resource
    Configuration assignments and decay of 126La high-spin bands (2000)
    Springer
    The European physical journal 7 (2000), S. 7-10 
    Details
    ISSN: 1434-601X
    Keywords: PACS: 21.10.Re Collective levels – 23.20.Lv Gamma transitions and level energies – 21.60.Ev Collective models – 27.60.+j 90 ≤ A ≤ 149
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: High spin states of 126La have been populated using the reaction 116Sn+14N at 68 MeV. γ-rays and conversion electrons were detected with the GAREL array. Multipolarities of the lowest-lying in-band dipole transitions have been determined from the deduced internal conversion coefficients. Experimental B(M1)/B(E2) ratios have been derived for the bands and compared with calculated values using the Dönau-Frauendorf geometrical model. Configurations are proposed for the bands comparing them with cranked shell model calculations and on the basis of the measured B(M1)/B(E2) ratios. The β-decay of 126La has also been revisited. The population of the 126Ba levels gives a probable spin value of five for the decaying high-spin 126La state with T 1/2≈ 64 s which may indicate a signature inversion in the πh11/2νh11/2 band.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100500050002
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  • 8
    Electronic Resource
    Electronic Resource
    The spectroscopy and structure of odd-A Fr isotopes with A = 213−225 (2000)
    Springer
    Czechoslovak journal of physics 50 (2000), S. 949-968 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The remarkable features of the spectra of the odd-A Fr isotopes from 213Fr (with 126 neutrons) through 225Fr (with 138 neutrons) serve as a sequence of examples for the application of a variety of nuclear models. As the shapes vary from spherical to spherical with strong octupole correlations to octupole-deformed, the corresponding symmetry breaking leads to increasingly complex spectra. Of considerable interest is the fact that the 219Fr 9/2− ground state has the character of an h9/2 shell model state while still having the rotational properties appropriate as a legitimate member of a reflection asymmetric K = 1/2− band. It is also possible to follow the expansion of the more degenerate shell model states into the less degenerate reflection asymmetric states. This results from dramatic decreasing in decoupling parameters with increasing mass number.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022887329369
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