Pr�ziseQ ? -Wert-Messungen mit einem Intrinsic-Germanium-Detektor an schweren, neutronenreichen Spaltprodukten

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 the Ot~-values of the following neutron-rich nuclides could be deduced with high accuracy:

Beta-decay energies of neutron-rich nuclei in the mass region 142?A?150

“…In the fifth column of this table, an "adopted value" has been calculated for those nuclei, for which at least two different Q~-measurements have been reported. In the calculation of these adopted values, the experimental errors in the study of Decker et al [10] have been multiplied by a factor of two in all cases, where these errors are below 50keV. This was done, because important systematic errors, especially those due to the detector response function, have not been taken into account correctly in the calculation of the experimental errors in [10].…”

“…In the calculation of these adopted values, the experimental errors in the study of Decker et al [10] have been multiplied by a factor of two in all cases, where these errors are below 50keV. This was done, because important systematic errors, especially those due to the detector response function, have not been taken into account correctly in the calculation of the experimental errors in [10]. In the last column of Table 2, the Qp-values from "The 1983 Mass Table" are presented.…”

“…This is the case for the Qt<values of 145Cs, 146Ba and 146La. The Qp-value of 14SCs in [10] is certainly too low by about 550 keV, as will be shown below, because it disagrees with the direct mass measurements of this nucleus [25]. In the study of the nuclei with A = 146, all three isobars (Cs, Ba and La) were present simultaneously in the sources used by Decker et al Therefore, the /?-decay energies of 146Ba and 146La could only be determined from the endpoints of/?V- coincidence spectra.…”

High resolution positron Q-value measurements and nuclear structure studies far from the stability line. Progress report

“…e a r l i e r [ 5 ] and a n a l y s i s o f t h e d e t e c t o r d i s t o r t e d d a t a has been accomplished t h r o u g h an i t e r a t i v e technique 161. It has a l s o been demonstrated t h a t a .…”

“…I n t h e i r e a r l i e r work, Decker e t a l . ' [4,5] e x p e r i m e n t a l l y s t u d i e d t h e e l e c t r o n response o f Ge u s i n g m o n e r g e t i c ' e l e c t r o n s . .…”