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  • Articles: DFG German National Licenses  (22)
  • 1985-1989  (13)
  • 1975-1979  (9)
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  • Articles: DFG German National Licenses  (22)
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  • 1
    Electronic Resource
    Electronic Resource
    On the yrast two proton-two neutron hole states in208Po (1978)
    Springer
    The European physical journal 287 (1978), S. 219-228 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract High-spin levels in208Po, populated in the208Pb(α,4n)-reaction, were studied usingα-particles in the energy region 41–51 MeV. The energies of levels above the 6+ level have an uncertainty of about 10 keV due to the fact that the 8+→6+ transition has not been observed so far, but this transition has previously been established to be converted neither in theK-shell nor in theL-shells. It was found that the yrast cascade ofγ-rays from a 19+ level at 5896+ε keV feeds levels of lower spin which all can be explained as originating from two proton-two neutron hole configurations. In the higher part of the cascade it is mainly the neutron holes which change their configuration, while the lower part of the cascade is dominated by changes in the proton configuration. The yrast levels in the angular momentum regionJ=8–19 vary practically linearly with energy in the region 1.5–6 MeV. No isomeric traps were found above the 11− level at 2699+ε keV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01408091
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    High spin isomers in151Dy+ (1979)
    Springer
    The European physical journal 290 (1979), S. 337-338 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Three yrast isomers in151Dy, at 6.03 MeV (I=49/2, T/=15(3) ns), 4.90 MeV (41/2−, 5.5(1.0) ns), and at 2.96 MeV(27/2−, 1.3(6) ns) have been located through152Gd(α,5n) and136Ce(18O, 3n) measurements. Shell model configurations are suggested for them.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01408552
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    On the yrast levels in204Pb (1978)
    Springer
    The European physical journal 284 (1978), S. 217-231 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract High-spin states in204Pb were populated in the204Hg(α,4n) reaction using α-particles in the energy region 42–51 MeV. Prompt and delayedγ-rays as well as conversion electrons were studied in addition to excitation functions, angular distributions andγ-γ coincidences. In this way a stretched cascade ofγ-rays from a level at 8125.9 keV was found to feed the previously known isomeric 9− level at 2185.7 keV. Spins and parities were established for levels up to and including a 19− level at 6098.0 keV. The levels with c= 172212; and 19− at excitation energies of 5664.3 and 6098.0 keV are likely to be due to the simplep 1 2/s-1 i 13 2/−3 andf 5 2/−1 i 13 2/−3 configurations. The agreement between calculated and experimental energies for all observed levels in the regionJ=9–19 is very good in cases where the empirical two-particle interactions used are satisfactorily well known. Above the 19− level there are three weakly populated levels at 7402.1, 7849.2 and 8125.9 keV, which are likely to haveJ≥20. None of these energies agrees with the calculated value 7695±20 keV for the 20+ state of thei 13 2/−4 configuration which has the highest angular momentum produced by the four valence neutron holes. This apparent anomaly can be understood if the yrast levels withJ≥20 have angular momentum contribution from the core. It seems likely that the states at 7402.1, 7849.2 and 8125.9 keV are due to proton core excited states of the typeπh 9/2 h 11 2/−1 ×νp 1 2/−2 i 13 2/−2 withJ π=20+ andJ π=21+ andπh 9/2 h 11 2/−1 ×νp 1 2/−1 f 5 2−1 i 13 2/−2 withJ π=22+ or 23+, respectively. The state at 8126 keV has the highest energy so far directly observed in a stretched cascade ofγ-rays from the decay of a heavy nucleus produced in (α, xn) reactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01411332
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  • 4
    Electronic Resource
    Electronic Resource
    Particle hole yrast states in146Gd and147Gd and the Z=64 shell closure (1979)
    Springer
    The European physical journal 290 (1979), S. 279-295 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The level structures of146Gd and147Gd have been investigated by in-beamγ-ray ande − spectroscopy with (α, xn) reactions on enriched Sm targets. Detailed level schemes up to ∼4 MeV, which differ radically from earlier schemes, are reported. The energy levels are characterized as particle-hole excitations using empirical single particle energies and two nucleon interactions. Analysis of pure 1p 1h proton excitations demonstrates that theZ=64 andN=82 energy gaps are about equally large.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01408545
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  • 5
    Electronic Resource
    Electronic Resource
    Evidence for a 10+ state in132Te (1979)
    Springer
    The European physical journal 292 (1979), S. 145-151 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A new isomeric state witht 1/2=3.9±0.3μs has been observed in the nucleus 52 132 Te80 which has two protons more and two neutrons less than the doubly magic isobar 50 132 Sn82. The deexcitation pattern suggests spin and parity 10+ for this level near 2,700 keV which is populated in fission. The energy and the half-life of the isomer can be understood with the assumption that it is the 10+ level based on theh 11 2/−2 neutron hole configuration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01441621
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  • 6
    Electronic Resource
    Electronic Resource
    High spin states in205Pb and a precision test of the nuclear shell model for three nucleons (1976)
    Springer
    The European physical journal 277 (1976), S. 273-290 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using the204Hg(α, 3n) reaction withα-particles of about 40 MeV, we have proved by applying nowadays conventionalγ-ray spectroscopy in-beam technique, that there are two isomeric states in205Pb at the excitation energies 5,161.3 and 3,195.5 keV having the half-lives 71±3 and 217±5 ns, respectively. These isomeric states have spins and parities 33/2+ and 25/2− and are mainly due to thei 13 2/−3 andi 13 2/−2 p 1 2/−1 configurations, respectively. This conclusion is supported by the experimentalg-factors of these states being −0.159±0.008 and −0.0676±0.0011, respectively. It is furthermore shown that theE2 effective neutron charge is the same forE2 transitions from the 33/2+ state in205Pb and from the 12+ state in206Pb as required by the assumption that the208Pb core is responsible for the totalE2 strength of the neutron holes, and that these states are due to thei 13 2/−3 andi 13 2/−2 configurations. The calculatedB(E3) values ofE3 transitions from isomeric states in205Pb and206Pb agree reasonably well with the experimental values as expected from the assumption that theE3-strength should come from particle coupling to the octupole states of the208Pb core. The energies of the six most well established excited states in205Pb with angular momenta in the region 19/2–33/2 were calculated using empirical single-particle energies, empirical two-particle interactions and angular momentum algebra. The average deviation between experimental and calculated energies is −3 keV and the root mean square deviation 6 keV as compared to the uncertainty ± 5 keV in the nuclear masses used in the calculation. For the orbits concerned the shell model is thus valid with an extremely high precision. The contribution of effective three-particle interaction in these orbits must consequently be less than about 5 keV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01415603
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  • 7
    Electronic Resource
    Electronic Resource
    Two-proton neutron-hole yrast excitations in 66 147 Dy81 (1985)
    Springer
    The European physical journal 321 (1985), S. 287-295 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The level structure of theN=81 nucleus147Dy has been studied byγ-ray spectroscopy following reactions of 230–250 MeV58,60Ni beams on89Y and90,92Zr targets. Yrast and near-yrast levels in147Dy above the known 59-s 11/2− state are established up to ∼3.7 MeV; they include isomeric levels at 2,681, 3,407 and 3,650 keV. Guided by the results of shell model calculations, we interpret most of the observed level as senioritythree states arising from the coupling ofs 1/2,d 3/2, andh 11/2 neutron holes withπh 11/2 2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01493450
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  • 8
    Electronic Resource
    Electronic Resource
    The ground state mass of147Gd from single-neutron-transfer reactions and its impact on derived mass values (1986)
    Springer
    The European physical journal 324 (1986), S. 27-34 
    Details
    ISSN: 1434-601X
    Keywords: 21.10.Dr ; 21.60.Cs ; 27.60.+j
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using a148Gd radioactive target and the (p,d), (d,t), and (3He,α) single neutron pick-up reactions we have measured the147Gd mass excess as — 75,366(4) keV, which differs by 139(24) keV from the adopted value of the 1983 mass table. From this result, and from recently reported first transfer-reaction mass determinations for145Eu and146Eu, we have recalculated the masses of nuclei above146Gd from a previous shell model analysis of high-spin states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01290751
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  • 9
    Electronic Resource
    Electronic Resource
    Level structure of proton-richN=83 Nuclei150Ho and152Tm (1986)
    Springer
    The European physical journal 325 (1986), S. 27-35 
    Details
    ISSN: 1434-601X
    Keywords: 21.60.Cs ; 23.20.Ck ; 23.20.Lv
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The yrast levels of theN=83 odd-odd nuclei150Ho and152Tm have been studied byγ-ray spectroscopy following reactions induced by 240–250 MeV60Ni ions. Isomers have been identified in150Ho at 1.096, 2.625 and ∼8.0 MeV and in152Tm at 2.555 and ∼ 6.3 MeV, and the level schemes of both nuclei have been established up to 2.6 MeV. The level spectra are interpreted using the shell model in terms of the coupling of anf 7/2,h 9/2 or i13/2 valence neutron to the yrast excitations of the neighboring N=82 nuclei.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294239
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  • 10
    Electronic Resource
    Electronic Resource
    Decays of $$(vh_{11/2} ^n )^{10 + } $$ and $$(\pi d_{5/2} vh_{11/2} ^n )^{25/2 + } $$ isomers in even-A Sn and odd-A Sb nuclei (1987)
    Springer
    The European physical journal 328 (1987), S. 487-492 
    Details
    ISSN: 1434-601X
    Keywords: 27.60.+ J ; 23.20.Ck
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Isomeric decays in116, 118, 120Sn and119, 120Sb have been studied by measurements of delayedγ-rays following reactions of 26–40 MeV7Li ions on Cd targets. A 6.3 μs isomer of $$(vh_{11/2} ^n )^{10 + } $$ character in120Sn is reported. The experimental variation inB(E2, 10+ → 8+) between $$vh_{11/2} ^n $$ states in116, 118, 120, 128, 130Sn is compared with the expected dependence on vh11/2 subshell occupation number. Isomerism in Sb nuclei is also discussed, and a known high-spin isomer in119Sb is assigned the same seniority-three configuration $$(\pi d_{5/2} vh_{11/2} ^n )^{25/2 + } $$ as a well-established 340 μs isomer in117Sb.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01289635
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    Paper (German National Licenses)
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