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  • 1
    Electronic Resource
    Electronic Resource
    β +-endpoint measurements near100Sn and146Gd (1991)
    Springer
    The European physical journal 340 (1991), S. 363-370 
    Details
    ISSN: 1434-601X
    Keywords: 21.10.Dr ; 23.40.−s ; 27.60.+j
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract With a summation-free β+-endpoint spectrometer the β+-decay energies of104Sn,147Tb,148, 149Dy,149Ho,150Er, and151Tm were remeasured with improved accuracy. Combined with known proton and alpha decay energies, the resulting QEC values lead to atomic masses of very neutron-deficient isotopes including nuclei beyond the proton drip-line such as109I and113Cs. Furthermore, the Gamow-Tellerβ-strength of the even-even nuclei104Sn,148Dy, and150Er is reevaluated with reduced uncertainty.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01290323
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  • 2
    Electronic Resource
    Electronic Resource
    Decay properties of the new proton-rich nucleus104Sn: Mass determinations beyond the proton drip line (1985)
    Springer
    The European physical journal 321 (1985), S. 599-603 
    Details
    ISSN: 1434-601X
    Keywords: 23.40.Hc ; 21.10.Dr ; 29.30.Kv
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The new proton-rich nucleus104Sn was produced in a50Cr(58Ni, 2p2n)104Sn reaction. Its half-life was measured to be 21±1s. From a newly established partial decay scheme, aQ EC value of 4,000 −300 +650 keV was estimated. The resulting mass excess value for104Sn, combined with decay energies for α and proton emission, leads to mass excess values for the nuclei108Te,109I,112Xe, and113Cs. These mass values are compared to predictions of mass formulae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01432436
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  • 3
    Electronic Resource
    Electronic Resource
    The Gamow-Teller beta decay of neutron-deficient even isotopes of tin (1988)
    Springer
    The European physical journal 329 (1988), S. 319-330 
    Details
    ISSN: 1434-601X
    Keywords: 23.40.Hc ; 21.10.Dr ; 21.10.Pc ; 27.60.+j ; 29.30.Kv
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract With the use of the58Ni+50Cr fusion-evaporation reaction and chemically selective on-line mass separation, the EC/β + decay of104Sn was studied byγ-ray and conversionelectron spectroscopy. In the course of these studies, a new 15.7-s isomeric state of104In was observed. Reinvestigation of theβ-decays of the two heavier even isotopes of tin, produced in the58Ni+58Ni reaction and mass separated without chemical discrimination, brought new information on the decay of106Sn and108Sn. The QEC values of104Sn,106Sn and108Sn were determined to be 4550 −250 +300 keV, 3200±100 keV and 〈 2270 keV, respectively. In the data analysis, the emphasis is put on the identification of the 0+ → 1+ Gamow-Tellerβ transitions and determination of their strengths. For104−110Sn, the total Gamow-Teller strengths are measured to be 20% to 30% of that predicted by the single-particle shell model with the inclusion of pairing correlations and core polarization. Predictions of the decay properties of the as yet unobserved102Sn and100Sn are made.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01290237
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  • 4
    Electronic Resource
    Electronic Resource
    The Gamow-Teller beta decay of100Cd (1989)
    Springer
    The European physical journal 332 (1989), S. 275-284 
    Details
    ISSN: 1434-601X
    Keywords: 23.40.Hc ; 21.10.Dr ; 27.60.+j ; 29.30.Kv
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Neutron-deficient isotopes of cadmium were produced in thep(600 MeV)+natSn spallation reaction. The ISOLDE facility provided mass-separated beams of these isotopes. The production yield was 103 to 104 atoms/s for100Cd and roughly two orders of magnitude less for98Cd. The properties of the100Cd→100Ag decay were studied in detail by X-ray,γ-ray and conversion electron spectroscopy. Forty nineγ-transitions were assigned to this decay, and all but five of them were placed in the decay scheme. The half-life was determined to be 49.1±0.5 s. TheQ EC value of 3890±70 keV was deduced from a comparison of experimental and theoreticalβ +/(EC+β + probability ratios. Seven 0+→1+ Gamow-Teller transitions with log ft values between 3.5 and 4.9 were identified. The total (summed) strength is about five times smaller than predicted by the shell model for the transformation of ag 9/2 proton into ag 7/2 neutron. The quenching of the Gamow-Teller strength and other questions of nuclear structure are discussed for the100Cd decay. The properties of98Cd are inferred by extrapolation of104,102,100Cd data, and some preliminary experimental results on98Cd decay are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01295457
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  • 5
    Electronic Resource
    Electronic Resource
    Gamow-Teller decay of118Pd and of neighbouring even isotopes of palladium (1989)
    Springer
    The European physical journal 333 (1989), S. 339-348 
    Details
    ISSN: 1434-601X
    Keywords: 23.40.Hc ; 21.10.Dr ; 21.10.Pc ; 27.60.+j ; 29.30.Kv
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Neutron-rich isotopes of palladium were produced via the fission of238U by 20 MeV protons. These isotopes were selected using the ion guide-fed on-line mass-separator facility IGISOL at Jyväskylä. Their decays were studied byβ-ray,γ-ray and conversion-electron spectroscopy. For114Pd and116Pd, the decay schemes established previously were confirmed; additionally multipolarities were determined for a few transitions. In the case of118Pd, only an approximate half-life was known from a previous radiochemical experiment. In the present study, 15 gamma transitions were observed, most of which were placed in a decay scheme. The half-life and the decay energy were found to beT 1/2=1.9±0.1 s andQ β=4.0±0.2 MeV. The decay schemes of114Pd,116Pd and118Pd include — respectively — two, two and four 0+→1+ Gamow-Teller beta transitions with logft values between 4.1 and 5.1. The strength of these transitions is discussed in terms of the extreme single particle shell model with pairing and the spherical proton-neutron quasiparticle random phase approximation. The possible role of deformation is considered using a shell correction method. Predictions for the decay properties of the as yet unobserved120Pd are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01299686
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  • 6
    Electronic Resource
    Electronic Resource
    The Gamow-Teller transitions in the96Pd→96Rh decay (1985)
    Springer
    The European physical journal 322 (1985), S. 263-270 
    Details
    ISSN: 1434-601X
    Keywords: 23.40.Hc ; 21.10.Dr ; 21.10.Pc ; 27.60.+j ; 29.30.Kv
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using the40Ca(4.2 MeV/u) +60Ni reaction and on-line mass separation, the decay properties of 46 96 Pd50 were reinvestigated. From a comparison of experimental and theoreticalβ +/(EC +β +) probability ratios, theQ EC value was deduced to be 3,450 ± 150 keV. The strength was determined for four 0+→1+ Gamow-Teller beta transitions and found to be quenched as compared to predictions of the single-particle shell model. For96Pd and94Ru the sources of this quenching are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01411890
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  • 7
    Electronic Resource
    Electronic Resource
    Q EC value and Gamow-Teller strength of the102CdEC/gb+ decay (1991)
    Springer
    The European physical journal 339 (1991), S. 355-361 
    Details
    ISSN: 1434-601X
    Keywords: 23.40.Hc ; 21.10.Dr ; 21.10.Pc
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Within the framework of a systematic study of 0+→1+ Β-transitions in the100Sn region, the decay of the neutrondeficient isotope102Cd was investigated. This isotope was produced in16O+92Mo and58Ni+50Cr heavy-ion reactions and in proton-induced spallation ofnatSn, and mass-separated samples were prepared by means of the GSI and the ISOLDE on-line mass separators, respectively. Observations of X-rays,γ-rays, and conversion-electrons studies have led to an improved102Cd→102Ag decay scheme which includes six 0+→1+ Gamow-Teller transitions. The half-life of102Cd was redetermined with higher accuracy to be 345±8 s. Using a Si(Li)-BGO-Ge spectrometer, theΒ + endpoint energy of the main decay component was measured, yielding aQ EC value of 2587±8 keV. This very small uncertainty ofQ EC, combined with the improved knowledge of half-life and decay scheme, allows an accurate determination of the observed Gamow-Teller decay strengthB Σ (GT)=1.513±0.055 for102Cd. This result is discussed in comparison with predictions from model calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01560637
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  • 8
    Electronic Resource
    Electronic Resource
    Structure of nuclei near100Sn and theπg 9/2 →vg 7/2 Gamow-Teller beta decays (1988)
    Springer
    The European physical journal 329 (1988), S. 267-273 
    Details
    ISSN: 1434-601X
    Keywords: 21.10.Dr ; 21.60.Cs ; 23.40.Hc
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Selected properties of the Gamow-Teller beta decay of even nuclei near100Sn have been studied. Two theoretical models were used: a self-consistent Hartree-Fock-Bogolyubov approach with the Skyrme interaction and a shell-correction model with a Woods-Saxon average field and monopole pairing residual interaction. Calculations reproduce fairly well both theQ EC values and the average energies of theI π=1+ states fed directly in the decay. It is shown that the observed energy splitting between the 1+ states cannot be associated with a stable deformation of a final doubly-odd nucleus. The calculated pairing factors are used to estimate the 0+ → 1+ GT transition strength in the neighbourhood of doubly-magic 50 100 Sn50.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01290232
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  • 9
    Electronic Resource
    Electronic Resource
    Gamow-Teller beta decay of the very neutron-deficientN=50 nuclide98Cd (1992)
    Springer
    The European physical journal 342 (1992), S. 43-51 
    Details
    ISSN: 1434-601X
    Keywords: 23.40.Hc ; 21.10.Dr ; 21.10.Pc
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract For the first time, detailed decay-spectroscopic investigations were performed for the very neutron-deficientN=50 nuclide98Cd. The98Cd activity was produced in spallation reactions between 600 MeV protons and a natural tin target, yielding a98Cd beam intensity of 10 to 60 atoms/s at the collector of the ISOLDE massseparator. By means ofγ-ray and conversion-electron spectroscopy, 19 transitions were found to follow the β+/EC decay98Cd→98Ag. The transitions at 61 and 107 keV were shown to beM1(+E2) andE2, respectively, and the98Cd half-life was measured as 9.2±0.3 s. TheQ EC value of98Cd is determined semiempirically and is compared to model predictions together with the measuredQ EC values of the neighbouring cadmium isotopes100,102Cd and theN=50 isotones92Mo,94Ru, and96Pd, taken from the literature. The newly established decay scheme of98Cd includes 9 excited states of98Ag. Four states at 1691, 1861, 2164, and 2544 keV are directly fed by 0+ → 1+ Gamow-Teller beta transitions with a summed strength of 3.5 −0.7 +0.8 . This value corresponds to 25±5% of the strength predicted for the GT transformation of a g9/2 proton (in98Cd) into a g7/2 neutron (in98Ag) by the extreme single-particle shell model. The GT-strength splitting and quenching, observed for98Cd, are compared with the corresponding data for lighter even-even N=50 isotones, and are discussed with reference to the predictions of more sophisticated nuclear models. We find that only in some cases it is possible to explain qualitatively the observed GT strength distribution and its total magnitude without renormalizing the free-neutron value of the axial-vector coupling constant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294487
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