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  • 1
    Electronic Resource
    Electronic Resource
    Characterization of deep-level defects in GaAs irradiated by 1 MeV electrons (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 640-647 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Deep level transient spectroscopy has been employed to determine the defect energy levels, capture cross sections, and trap densities in Si-doped vapor phase epitaxy GaAs both before and after irradiation by 1 MeV electrons at room temperature for electron fluence ranging from 1.1×1014 to 5.0×1015 e cm−2. The results indicate that the irradiated samples have an electron trap at Ec-0.334 eV(EL6) in addition to the two electron traps at Ec-0.815 eV(EL2) and Ec-0.420 eV(EL3) which are present in the nonirradiated sample. The density of the EL6 trap increases monotonically with irradiation fluence from 6.7×1013 to 24.4×1013 cm−3 as electron fluence is increased from 1.1×1014 to 3.1×1014 e cm−2. In contrast, both the EL2 and EL3 trap densities were found to be only moderately affected by electron irradiation with trap densities slightly greater than the nonirradiated sample. These results, along with the fact that the EL6 trap was not observed in the nonirradiated sample, strongly suggest that this trap is created by the electron irradiation. In addition to creating the EL6 trap, electron irradiation results in a nonexponential transient for the EL2 deep level at Ec-0.815 eV which can be resolved into the sum of two exponential transients arising from two closely spaced deep levels at Ec-0.815 eV and Ec-0.843 eV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353375
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  • 2
    Electronic Resource
    Electronic Resource
    The limit of stability of proton-rich thallium isotopes: a search for the decay of177Tl (1991)
    Springer
    The European physical journal 338 (1991), S. 245-246 
    Details
    ISSN: 1434-601X
    Keywords: 23.90.+ w ; 23.90.+ e ; 27.70.+ q
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The fusion reaction74Se+106Cd→180Pb* at a compound nucleus excitation energy Ex ≃ 40 MeV, has been used in a search for the decay of the unknown nucleus177Tl. Evaporation residues were velocity and mass analysed prior to implantation into a position sensitive silicon surface barrier detector. No evidence was discovered for the proton or alpha-decay of177Tl for a cross-section 〉 10 − 5+10 nb. This indicates either that177Tl decays too rapidly (t1/2 〈 1 μs) by proton emission for the decay to be detected, or that177Tl is produced with a cross-section less than the limit established in the present experiment. The following nuclear decay half-lives were measured with improved accuracy;177Hg (t1/2 = 130±5 ms),178Hg (t1/2=250±25 ms) and177Au (t1/2=1180±70 ms). The experiment also provided the first direct confirmation of the correct mass assignment of the alpha-decay, Eα=6.26 MeV, to the decay of176Au. Two additional halflife measurements of proton-rich Osmium isotopes are also presented from a previous similar experiment;165Os (t1/2=73±8 ms) and166Os (t1/2 = 194±17 ms).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01284803
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  • 3
    Electronic Resource
    Electronic Resource
    Evidence for the alpha decay of108I (1991)
    Springer
    The European physical journal 338 (1991), S. 295-301 
    Details
    ISSN: 1434-601X
    Keywords: 23.60.+e ; 23.90.+w ; 27.60.+j
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A Residue Implantation Detection System has been used in conjunction with the Daresbury Recoil Mass Separator in a search for radioactivity from the unknown nuclides108I and105Te. In the reaction of 260 MeV58Ni ions with a54Fe target two new decay lines at energies of 3.730±0.025 MeV and 3.885±0.025 MeV corresponding to cross sections of approximately 0.3 μb and 0.4 μb respectively were identified in theA=108 region of the separator's focal plane. These decay lines are tentatively assigned to the alpha decays of108I. No evidence for a proton decay branch of this nuclide could be found. In a second reaction in which a50Cr target was bombarded with 230 MeV58Ni ions, no alpha decay peak from105Te could be identified. Cross section dependent half life limits were determined from which correspondingQ-value limits were deduced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01288193
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  • 4
    Electronic Resource
    Electronic Resource
    A 15 μs isomer in thez=70n=83 nucleus153Yb (1989)
    Springer
    The European physical journal 332 (1989), S. 105-106 
    Details
    ISSN: 1434-601X
    Keywords: 21.10.Pc ; 23.2O.Lv ; 27.70.+q
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Gamma-ray measurements following mass analysis of102Pd+245 MeV54Fe reaction products have characterized a 15 μs isomeric decay in153Yb and elucidated the systematics of proton-rich N=83 nuclei.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01292587
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  • 5
    Electronic Resource
    Electronic Resource
    Isomeric decay studies using a recoil mass separator (1993)
    Springer
    The European physical journal 344 (1993), S. 369-379 
    Details
    ISSN: 1434-601X
    Keywords: 21.10.Pc ; 23.20.Ck ; 23.20.Lv ; 27.70.+q
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Microsecond isomers in the exotic proton-richN=82, 83 nuclei153Yb,153Lu,154Lu and154Hf have been identified byγ-ray spectroscopy following mass analysis of102Pd+245 MeV54Fe reaction products using the Daresbury Recoil Separator. The decays of the isomers, interpreted asπh 11 2/n andπh 11 2/n vf7/2 states, are characterized. The reduced E2 transition rates indicate that half-filling of theπh11/2 subshell occurs just belowZ=71, and results for theN=83 odd-odd isotones are also consistent with this finding.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01283192
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  • 6
    Electronic Resource
    Electronic Resource
    A 35 μs isomer in the exoticN=83 Nucleus154Lu (1990)
    Springer
    The European physical journal 335 (1990), S. 241-242 
    Details
    ISSN: 1434-601X
    Keywords: 21.10.Pc ; 23.20.Ck ; 23.20.Lv ; 27.70.+q
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Measurements of γ-rays from mass analyzed nuclear recoils produced in the102Pd +54Fe reaction at 245MeV have allowed us to characterize the decay of a 35 μs isomer in154Lu. The rates of E2 transitions de-exciting isomeric levels in proton-rich N=82, 83 isotones are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294480
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