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  • 1980-1984  (3)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Beta-delayed neutron emission from93–100Rb to excited states in the residual Sr isotopes (1982)
    Springer
    The European physical journal 306 (1982), S. 239-257 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Beta-delayed neutron emission from the precursors93–100Rb to excited states in the residual nuclei92–99Sr has been measured by means ofγ-ray and neutron spectroscopy. In general, considerable neutron feeding of excited final states is observed. The experimental branching ratios (P n i ) are compared to predictions from statistical model calculations. It is demonstrated that the main parameter affecting theP n i -values is the shape of theβ-strength function (S β). For several Rb isotopes hindrance, respectively enhancement of neutron branches to specific final states is observed giving evidence for the persistence of intermediate structure of the neutron-emitting states. By the example of98Rb it is shown that a few integralβ-delayed neutron properties may be sufficient to derive first estimates on the real shape ofS β above the neutron binding energy. This result is of importance for exotic nuclei where detailed spectroscopic investigations are precluded.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01415126
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    PräziseQ β -Wert-Messungen mit einem Intrinsic-Germanium Detektor an leichten, neutronenreichen Spaltprodukten (1980)
    Springer
    The European physical journal 294 (1980), S. 35-49 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An intrinsic Germanium detector of 10 mm depth and 300 mm2 sensitive area has been used to determineβ-endpoint energies for Rb, Sr and Y fission products. It was calibrated with monoenergetic electrons supplied by a magnetic conversion electron spectrometer for the energy range from 1.6 to 8 MeV. The energy calibration of the detector is linear with deviations less than 2 · 10−4, and the detector was recalibrated daily using precisely known gamma rays of90Rb. At the on-line fission product separator OSTIS at the ILL, Grenoble the endpoints ofβ-singles-spectra have been determined andQ-values deduced if possible also from beta-gamma coincidence measurements. The obtainedQ-values are:88Rb:(5 318±4) keV,89Rb: (4 510 ± 8) keV,90Rb: (6 578 ± 15) keV,91Rb: (5 857 ± 8) keV,91Sr: (2 704.5 ±3) keV,92Rb: (8 111 + 15) keV,93Rb:(7 485 ± 15) keV,94Rb: (10 304 ± 30) keV,94Sr: (3 512 ± 5) keV,94Y: (4 920 ±5)keV,95Rb: (8 947 ±100) keV,95Y: (4 445±5) keV,96Rb: (11 303±250) keV,96Sr: (5 413±20) keV,96Y: (7 120 ±50) keV,97Rb: (10 020 ±50) keV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01473120
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    PräziseQ β -Wert-Messungen mit einem Intrinsic-Germanium-Detektor an schweren, neutronenreichen Spaltprodukten (1981)
    Springer
    The European physical journal 301 (1981), S. 165-175 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An intrinsic germanium detector was used to measure the beta endpoint energies of heavy fission products supplied by the on line mass separator OSTIS installed at the high flux reactor of the Institut Max von Laue-Paul Langevin, Grenoble. The endpoints of singles-spectra have been determined and, by means of beta-gamma coincidence measurements also most of theQ β-values of the following neutron-rich nuclides could be deduced with high accuracy:138Cs: (5388±25)keV,139Cs: (4213±5)keV,139Ba: (2336±25)keV,140Cs: (6220±15)keV,141Cs: (5252+15/-60)keV,141Ba: (3208±35)keV.142Cs: (7329±20)keV,143Cs: (6287+40/-250)keV,143Ba: (4259±40)keV,144Cs: (8451±30)keV,145Cs: (7358±70)keV.146Cs: (9300±900)keV,146Ba: (4280±100)keV.146La: (6175±100)keV. The results are compared with experimental results of direct mass measurements and some predictions by mass formulae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01419247
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    Paper (German National Licenses)
    Fulltext
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