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  • 27.20.+n  (3)
  • 27.90.+b  (3)
  • Behavior  (2)
  • 1
    Digitale Medien
    Digitale Medien
    The new neutron-rich isotope228Rn (1989)
    Springer
    The European physical journal 333 (1989), S. 109-110 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 23.90.+w ; 27.90.+b
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The new neutronrich isotope 228 Rn was produced by spallation reactions induced by 600 MeV protons in a 232 Th target and identified by massseparation and decay spectroscopy. The Zassignment was confirmed via KX-rays and the genetic relationship to the wellknown daughter product 228 Fr. The halflife of 228 Rn is 65±2 s. Energies and relative intensities of prominent γ-rays are presented for the first time from the decay of both the new isotope 228 Rn and 227 Rn.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01290116
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  • 2
    Digitale Medien
    Digitale Medien
    New neutron-rich isotopes of astatine and bismuth (1989)
    Springer
    The European physical journal 333 (1989), S. 131-135 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 23.90.+w ; 27.90.+b
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Neutron-rich isotopes of astatine have been produced through spallation reactions with 600 MeV protons on a232Th target and identified by spectroscopic techniques combined with one-line mass separation at the ISOLDE facility. The half-lives of218At and219At have been remeasured to be 1.5(3) s and 57(4) s, respectively. Four new isotopes of astatine,220−223At, have been observed for the first time, and their half-lives were found to be 3.73(13) min, 2.3(2) min, 54(10) s, and 50(7) s, respectively. Another nuclide,216Bi, has been observed for the first time as the daughter product of the220At alpha decay, and its half-life has been measured to be 6.6(21) min.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01565142
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  • 3
    Digitale Medien
    Digitale Medien
    Search for forbiddenβ-decays of the drip line nucleus12Be (1994)
    Springer
    The European physical journal 348 (1994), S. 61-62 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 21.10.Tg ; 23.40.Hc ; 21.60.Cs ; 27.20.+n
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Beta-coincidentγ-rays have been measured from implanted pure samples of12Be separated at the LISE3 spectrometer at GANIL. An intensity of 0.040(26) % can be estimated for the branching ratio of the isospin forbidden pure-Fermi transition to the 0+ excited state of12B and of 0.008(6)% of the transition to the 1−1 excited state. Both are taken to represent upper limits. The half-life has been re-measured to be 26.1(2.4) ms.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01291655
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  • 4
    Digitale Medien
    Digitale Medien
    Projectile Coulomb excitation with fast radioactive beams (1995)
    Springer
    The European physical journal 352 (1995), S. 397-401 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 23.20.Ck ; 27.20.+n
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We report a search for γ rays emanating from Coulomb excitation of fast (30–46 MeV/u) radioactive projectiles8He,11,12,14Be interacting with a lead target. These are clearly identified by their Doppler shift. The 320 keV 1/2− → 1/2+ γ transition from11Be was observed with a cross-section of 191±26 mb which is noticeably less than expected from the known lifetime and in the perturbation limit of pure Coulomb excitation. In the other nuclei rather stringent upper limits of 0.01 to 0.2 Weisskopf units, are placed on the hypothetical transition to 1− states.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01299757
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  • 5
    Digitale Medien
    Digitale Medien
    Super-allowed beta decay of nuclei at the drip-line (1991)
    Springer
    The European physical journal 340 (1991), S. 255-261 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 23.40.Hc ; 21.60.−n ; 27.20.+n
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We have investigated the continuous particle spectra following the beta decay of the neutron-rich nuclei that terminate the mass 6, 8, 9 and 11 isobaric chains. Strong beta transitions feeding the very top of the spectrum are found systematically. The favoured states are within a few MeV of the energy of the initial state. This phenomenon seems to be linked to the occurrence of a di-neutron structure or neutron halo in the drip-line nuclei.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01294673
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  • 6
    Digitale Medien
    Digitale Medien
    I. Functional properties of neurons in lateral part of associative area 7 in awake monkeys (1979)
    Springer
    Experimental brain research 34 (1979), S. 299-320 
    Details
    ISSN: 1432-1106
    Schlagwort(e): Parietal lobe ; Association cortex ; Microelectrode recording ; Monkey ; Behavior
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary The lateral part of area 7, area 7b, of alert, behaving macaque monkeys was investigated using transdural microelectrode recording technique. Two hundred twenty-eight cells from five hemispheres of four monkeys were isolated and studied. The functional properties of 2% of the cells isolated remained unidentified. Functions of the identified cells were prominently related to the spatial control of arm movements. Of the cells 70% responded to somatosensory (40%) or visual (16%) or both somatosensory and visual (14%) stimulation. The receptive fields of these passively drivable cells were large, covering, e.g., the arm or leg or chest or even the skin of the whole body. Most of the visually drivable cells responded to stimuli in both halves of the visual field. Of the cells responding to sensory stimulation 80% were activated by stimuli moving in a certain direction. Of the directionally selective cells 25% received information through more than one sensory channel. The complex stimulus-response relationships of these “convergence” cells revealed the existence of an integrative system which analyzes the direction of a stimulus moving in one sensory system using an other sensory system as a reference. Of all the cells isolated 28% discharged only during active movements of the arms (25%) or eyes (3%). Firing of these neurons was related to contraction of a functionally uniform group of muscles and not individual muscles. Some previous investigations of the parietal association cortex, conducted mainly in area 7a, have shown that most cells are active only when the monkey himself moves his eyes or arms. In our study on area 7b most cells responded to passive stimulation. The discrepancy between the results indicates functional differentiation within area 7.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00235675
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  • 7
    Digitale Medien
    Digitale Medien
    II. Functional properties of cells in anterolateral part of area 7 associative face area of awake monkeys (1979)
    Springer
    Experimental brain research 34 (1979), S. 321-333 
    Details
    ISSN: 1432-1106
    Schlagwort(e): Parietal lobe ; Association cortex ; Microelectrode recording ; Behavior ; Monkey
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary The most anterior part of area 7 of awake, behaving macaque monkeys was investigated using single cell recording technique. Eighty-five cells from three hemispheres of two monkeys were isolated and studied. These cells showed more complex functional properties than the cells in the primary and secondary cortical fields. Of the cells 61% responded to somatosensory (26%) or visual (2%) or both somatosensory and visual (33%) stimulation; 39% of the cells were active only during the monkey's own movements. Most of the cells studied were active while the monkey was bringing an object to the mouth with its hand, when reaching for an object with lips, or while chewing. The neurons responded selectively to, e.g., palpation of the flexors of the arm, a visual stimulus approaching the face, passive movement of the monkey's hand towards the mouth, or they were active only when the monkey was reaching for an object with its lips or was mouthing it. The cellular activity in the anterolateral part of area 7 was prominently related to the stimulation or motor activity of the face (especially the mouth). In this respect, it differed from the more posterior part of area 7 adjacent to it. The results thus indicate that there is a separate and rather extensive mouth (or face) area in the parietal association cortex of the monkey.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00235676
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  • 8
    Digitale Medien
    Digitale Medien
    New isotope227Rn and revised halflives for223Rn and226Rn (1986)
    Springer
    The European physical journal 325 (1986), S. 429-434 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 23.20.Lv ; 23.20.Nx ; 27.90.+b
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Neutron-rich isotopes of radon, produced by spallation reactions in a ThC2 target and selected chemically, were mass-separated and used as samples for radiation counting experiments. Assignments of the activities to radon isotopes were confirmed by genetic relationships to the previously known francium daughters. The halflife for the new isotope227Rn is 23±1 s and that for226Rn is 7.4±0.1 min. X-rays,γ-rays, and conversion electrons from the223Rn activity were measured. The decay patterns ofK X-rays and known gamma transitions in the223Fr daughter yield a halflife of 23.2± 0.4 min for223Rn, in contrast to the value of 43± 5 min reported earlier. Energies, intensities, and likely multipolarities for the most prominent gamma transitions in the223Rn→223Fr decay are presented.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01290045
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