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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