https://doi.org/10.1140/epja/i2006-10522-9
Regular Article - Experimental Physics
Qβ measurements of 158, 159Pm , 159, 161Sm , 160-165Eu , 163Gd and 166Tb using a total absorption BGO detector
1
Graduate School of Engineering, Nagoya University, 464-8603, Nagoya, Japan
2
Radioisotope Research Center, Nagoya University, 464-8602, Nagoya, Japan
3
Japan Atomic Energy Agency, 319-1195, Tokai-mura, Naka-gun, Ibaraki, Japan
4
Graduate School of Engineering, Hiroshima University, 739-8527, Higashi-Hiroshima, Japan
5
Research Reactor Institute, Kyoto University, 590-0494, Sennan-gun, Osaka, Japan
* e-mail: hayashi.hiroaki@b.mbox.nagoya-u.ac.jp
Received:
20
December
2006
Accepted:
16
January
2008
Published online:
6
February
2008
Q β values of the neutron-rich isotopes of 160-165Eu and 163Gd were measured for the first time using a total absorption bismuth germanate (BGO) detector, and previously obtained data on 158, 159Pm , 159, 161Sm and 166Tb were re-analyzed. These radioactive sources were prepared by an on-line mass separator (Tokai-ISOL) following the 238U (p,f reaction. The deduced Q β values are the following: 6085(80)keV for 158Pm , 3805(65)keV for 159Sm , 5460(140)keV for 159Pm , 4705(60)keV for 160Eu , 5065(130)keV for 161Sm , 3705(60)keV for 161Eu , 5575(60)keV for 162Eu , 4690(70)keV for 163Eu , 3170(70)keV for 163Gd , 6430(70)keV for 164Eu , 5800(120)keV for 165Eu , and 4695(70)keV for 166Tb . Moreover, the deduced mass excesses and two-neutron separation energies ( S 2n values) were compared with those of the atomic mass evaluations and theoretical predictions.
PACS: 21.10.Dr Binding energies and masses – / 29.40.Mc Scintillation detectors – / 27.70.+q 150 ≦ A ≦ 189 –
© Società Italiana di Fisica and Springer-Verlag, 2008