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  • 1
    Electronic Resource
    Electronic Resource
    The relationship between monkey dentate cerebellar nucleus activity and kinematic parameters of wrist movement (1998)
    Springer
    Experimental brain research 119 (1998), S. 179-190 
    Details
    ISSN: 1432-1106
    Keywords: Key words Cerebellum ; Dentate nucleus ; Neuronal activity ; Movement kinematics ; Monkey
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Extracellular single-unit recordings were made from cerebellar dentate neurones in two conscious monkeys trained to perform wrist flexion and extension movement tasks that produced a range of static joint positions and dynamic velocities. The experiment was designed to establish whether there is a relationship between the discharge of dentate neurones and movement kinematics. The discharge patterns of 58 “wrist-related” neurones were correlated with joint position, duration of unidirectional movement (referred to as duration of velocity) and amplitude of velocity (peak velocity). Significant (P〈0.05) correlations were found between the level of tonic discharge and static joint position in 21 of 58 (36%) neurones. Correlations between phasic discharge and at least one of the velocity variables were found in 17 of 43 (40%) neurones [7 of 43 (16%) showed a correlation between the duration of phasic excitation associated with movement and duration of velocity, 5 of 43 (12%) between the peak rate of phasic excitation and peak velocity and 10 of 43 (23%) between the number of discharges in the period of phasic excitation and peak velocity]. We conclude (for reasons outlined in the Discussion) that there is not a strong relationship between neuronal discharge and kinematic parameters of wrist movement in the dentate nucleus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002210050332
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    MULTIPHONON GIANT RESONANCES IN NUCLEI (1998)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Nuclear and Particle Science 48 (1998), S. 351-399 
    Details
    ISSN: 0163-8998
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Physics
    Notes: Abstract We review the present knowledge of multiphonon giant resonances in nuclei. Theoretical concepts approaching the intrinsic structure and excitation mechanisms of multiphonon states are discussed. The available experimental results are summarized, including a brief description of applied techniques. This review emphasizes electromagnetic excitations of double dipole resonances. Open questions and possible routes toward a solution are addressed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.nucl.48.1.351
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Few-neutron removal from238U at relativistic energies (1995)
    Springer
    The European physical journal 352 (1995), S. 163-169 
    Details
    ISSN: 1434-601X
    Keywords: 24.30.Cz ; 25.75.+r
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract As part of a comprehensive study of uranium fragmentation at relativistic energies at the GSI projectile fragment separator, FRS, inclusive neutron-removal cross sections have been measured for severalxn channels at projectile energies of 600 and 950A MeV using targets of Al, Cu and Pb. The variation of the experimental cross sections with target nuclear charge is used to disentangle nuclear and electromagnetic contributions. The electromagnetic cross sections agree surprisingly well with a simple harmonic oscillator calculation of giant dipole resonances based on measured photonuclear cross sections and do not require an extra enhancement of the two-phonon giant dipole excitation as concluded from similar measurements with197Au.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01298903
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  • 4
    Electronic Resource
    Electronic Resource
    In-beam γ-spectroscopy with relativistic radioactive ion beams (1999)
    Springer
    The European physical journal 6 (1999), S. 167-174 
    Details
    ISSN: 1434-601X
    Keywords: PACS: 25.60.+v reactions induced by unstable nuclei – 25.75.+r relativistic heavy ion collisions – 23.20.Lv gamma transitions and level energies – 27.40.+z 39 〈 A 〈 58 – 29.30.Kv X- and γ-ray spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: This work demonstrates the feasibility of in-beam γ-spectroscopy employing radioactive ion beam species at relativistic energies of E = 210 ∼ 280 A· MeV. Neutron-rich nuclei below 48Ca with neutron number between the two magic numbers 20 and 28 have been investigated. Using a Pb target, single step inelastic excitation originating mainly from Coulomb interaction takes place populating preferentially low-lying low-spin states and enabling the extraction of B(E2) values. On a C target, nucleon removal reactions are dominating and medium-spin states are populated thus offering spectroscopic information in neighboring nuclei. Cross sections of inelastic excitation are determined and compared to coupled-channels calculations. Two new states of the very neutron-rich nucleus 44Ar at 1.78(8) MeV and 2.61(16) MeV are deduced from γ-transitions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100500050331
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    Paper (German National Licenses)
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