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  • 1
    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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  • 2
    Electronic Resource
    Electronic Resource
    A 480 ms isomeric 29/2−-state of the $$(p_{1/2}^{ - 2} )_{0^ + } f_{5/2}^{ - 1} (i_{13/2}^{ - 2} )_{12^ + } $$ configuration in203Pb (1977)
    Springer
    The European physical journal 280 (1977), S. 51-60 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A new, 480 ms, 29/2− isomeric level has been found in203Pb at an excitation energy of 2950.1 keV by bombarding204Hg with α-particles in the energy range 45–55 MeV using the Stockholm 225-cm cyclotron. This 29/2− state is suggested to be mainly due to the configuration (p 1 2/−2 f 5 2/−1 i 13 2/−2 )12. The 29/2− state decays predominantly by a 153.4 keV M2 transition to a 23/2− level and by a 1027.5 keV M4 transition to a 21/2+ level, followed by two E2 transitions of energies 258.6 keV and 838.7 keV, respectively, to the previously known 13/2+, 6.4 s isomeric level. The decay scheme of the 29/2− isomeric state is based on experimental information obtained from total and delayedγ-ray intensities,γγ-coincidences, excitation functions, lifetime and delayed conversion electron measurements. The presence of the 29/2− level confirms an essential and expected feature of the shell model for five neutron holes added to the208Pb-core.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01438109
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  • 3
    Electronic Resource
    Electronic Resource
    Evidence for a 3.6 minute isomeric 12− state of the πh 11 2/−1 vi 13 2/−1 configuration in206Tl and effective two-particle interactions (1976)
    Springer
    The European physical journal 278 (1976), S. 257-264 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using the204Hg(α, pn)-reaction andα-particles of energies 39–55 MeV, we have found an isomeric 3.6 min 12− state in206Tl at 2,642.9 keV which has the two-hole configurationπh 11 2/−1 vi 13 2/−1 The 12− state decays mainly by anE5 transition of energy 1,021.4 keV to a 7+ state at 1,621.5 keV whose main configuration isπs 1 2/−1 vi 13 2/−1 There is, in addition, evidence for a weak 565 keVM 4 branch to an 8+ state at 2,078 keV whose main configuration should beπh 11 2/−1 vf 5 2/−1 . The 7+ state decays by a stretched cascade ofγ-rays to states of the following values ofJ π and excitation energy: 5 − + , 1,405.4 keV; 4−, 952.1 keV; 2−, 265.8 keV and 0−, 0 keV. The main configurations of these states areπh 11 2/−1 vp 1 2/−1 ,πd 3 2/−1 vf 5 2/−1 ,πd 3 2/−1 vp 1 2/−1 andπs 1 2/−1 vp 1 2/−1 respectively. From the nuclear masses of208Pb,207Pb,207Tl, and206Tl and the experimental excitation energies it is possible to obtain the proton hole-neutron hole interaction in206Tl. This interaction is compared with the calculations of Kuo and Herling and the discrepancies are discussed. The 12−→8+ M4 transition rate is reduced because of destructive interference between the protonh 11/2→d 3/2 and the neutroni 13/2→f 5/2 contributions. The magnitude of the reduction is accurately reproduced by the wave functions of Kuo and Herling. The 12−→7+ E5 transition rate is about twice as large as the single-holeπh 11 2/−1 πs 1 2/−1 transition rate. This deviation is fully explained by the configuration admixtures in the 7+ state, given by Kuo and Herling.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01409176
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  • 4
    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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  • 5
    Electronic Resource
    Electronic Resource
    Isomeric states and rotational structure in the doubly-odd nucleus176Ta (1978)
    Springer
    The European physical journal 287 (1978), S. 165-169 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The doubly-odd nucleus176Ta is investigated by means of in-beamγ-ray spectroscopy techniques using the reactions (α, 3n), (d, 2n) and (p, n). Life-time measurements in thens-region yield low-lying isomeric states withT 1/2=13±1 ns and 30.5±1 ns, while measurements in the ms-region show the existence of a 1.1±0.1 ms isomeric state. A rotational sequence, withK=5 or 6 for the band-head, is also observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01408086
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  • 6
    Electronic Resource
    Electronic Resource
    Neutronh 11/2 alignments in the triaxial nucleus133La (1991)
    Springer
    The European physical journal 338 (1991), S. 125-133 
    Details
    ISSN: 1434-601X
    Keywords: 21.10.−k ; 23.20.−g ; 27.60.+j
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract High spin states have been studied in133La via the122Sn (15N, 4ny) fusion evaporation reaction. Bands build on low lying h11/2,g7/2 and d5/2 proton states have been identified. At higher spin a h11/2 neutron alignment is observed. The softness with respect to the triaxial deformation makes the nuclear shape sensitive to the quasiparticle configurations and coexistence between states withy ≈ + 30°,y ≈ − 30° andy ≦ − 60° was found. The results have been interpreted using total routhian surface (TRS) model calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01284785
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