Qβ measurements of 158, 159Pm , 159, 161Sm , 160-165Eu , 163Gd and 166Tb using a total absorption BGO detector |
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| Authors: | H Hayashi Y Akita O Suematsu M Shibata M Asai T K Sato S Ichikawa I Nishinaka Y Nagame A Osa K Tsukada T Ishii Y Kojima A Taniguchi |
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| Institution: | (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 |
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| Abstract: | 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. |
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| Keywords: | 21 10 Dr Binding energies and masses 29 40 Mc Scintillation detectors 27 70 +q 150 ≦ A ≦ 189 |
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