Identiffication of 159Pm,162Sm and 166Gd.
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Accession number;02A0151804
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| Title;Identiffication of 159Pm,162Sm and 166Gd. |
| Author;
ICHIKAWA S
(Japan Atomic Energy Res.)
ASAI M
(Japan Atomic Energy Res.)
OSA A
(Japan Atomic Energy Res.)
TSUKADA H
(Japan Atomic Energy Res.)
HABA H
(Japan Atomic Energy Res.)
NAGAME Y
(Japan Atomic Energy Res.)
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Journal Title;Abstracts of Papers. Symposium on Radiochemistry
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Journal Code:F0139B
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ISSN:1345-2762
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VOL.45th;NO.;PAGE.26(2001)
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| Figure&Table&Reference;REF.2 |
| Pub. Country;Japan |
| Language;English |
| Abstract;.BETA.--decay half-lives are one of the important quantities related to the stability of neutron-rich nuclei as well as to the astrophysical calculations involving the rapid neutron capture process (r-process). Although the nuclei studied up to the present do not directly affect the evaluation of the nuclidic abundance produced in the r process, their experimental half-lives give a good opportunity to verify the validity of various theoretical calculations of .BETA.-decay half-lives. In the previous work, we determined .BETA.-decay half-lives of the isotopes 161Sm 165Gd, and 166,167,168Tb [1,2] produced in the proton-induced fission of 238U, and it was found that the half-life values observed are in good agreement with those predicted from the gross theory. In this report, we present the newly determined hal-life values of the three isotopes 159Pm 162sm and 166Gd together with that of the re-measured 166Tb. The experiments were performed at the JAERI (Japan Atomic Energy Research ) tandem accelerator facility. A stack of eight 238U targets (4 mg/cm2 thick each) was bombarded with a 15.5 MeV proton beam with the intensity of about 3 .MU.A. Fission products recoiling out of the targets were transported into an ion source of the JAERI-ISOL with the He/Pbl2 gas-jet stream. The transported nuclides were ionized and mass-separated as the monoxide ions. The mass-separated products were collected on an aluminized Mylar tape and periodically transported to a measuring position. .BETA.-.GAMMA. and.GAMMA.-.GAMMA.coincidence measurements were performed with a sandwich-type plastic scintil-lator and two HPGe detectors. The measured half-life values were 1.42.+-.0.15 s for 159Pm, 2.4.+-.0.5 s for 162Sm, 4.8.+-.1.0 s for 166Gd and 25.6.+-.2.2 s for 166Tb, respectively.... (author abst.) |
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