As a continuous search for the 'missing'α-decay of 239Cm, several irradiation experiments were done in July, 2005. The whole experimental procedure was similar as last year. To increase the yield of expected ...As a continuous search for the 'missing'α-decay of 239Cm, several irradiation experiments were done in July, 2005. The whole experimental procedure was similar as last year. To increase the yield of expected isotopes with intensive 12C beam, all of the irradiation have been done at night, and typical beam intensities varied between 0. 4-0.6 particleμA. Each irradiation lasted 4-6 h. The procedure of preparing展开更多
It is of special interest to search for those unknown α-emitters in the transuranium region which (i) are located along the path of α-decay chains that start in the superheavy element region, and (ii) establish a li...It is of special interest to search for those unknown α-emitters in the transuranium region which (i) are located along the path of α-decay chains that start in the superheavy element region, and (ii) establish a link to nuclides with known masses. The knowledge of all Qαvalues in an α-decay chain allows obtaining展开更多
As radiochemical techniques have an unsurpassed sensitivity, they are best apt to search for, to identify and to determine very small α-decay branches of longer-lived transuranium nuclides. Therefore, we have develop...As radiochemical techniques have an unsurpassed sensitivity, they are best apt to search for, to identify and to determine very small α-decay branches of longer-lived transuranium nuclides. Therefore, we have developed a chemical separation scheme to search for the 'missing' α-decay branch in 239Cm (T1/2≈3 h). Details of the motivation for this experiment and preliminary results from the first experiments are given elsewhere in this report.展开更多
The overall separation scheme to obtain a chemically purified Cm sample for the search of an α-decay branch in 239Cm (see for preliminary results) is described in Part Ⅰof this contribution. The Part Ⅱdescribes det...The overall separation scheme to obtain a chemically purified Cm sample for the search of an α-decay branch in 239Cm (see for preliminary results) is described in Part Ⅰof this contribution. The Part Ⅱdescribes details of the liquid chromatographic separation of a Cm fraction - modeled with lanthanide (Ln) tracers. The main goal of the scheme was to produce fast, reliably and with a high and controllable yield Cm fractions which are free from unwanted α-activities. This separation scheme was not optimized to separate elements which may strongly interfere in γ-spectroscopic studies.展开更多
文摘As a continuous search for the 'missing'α-decay of 239Cm, several irradiation experiments were done in July, 2005. The whole experimental procedure was similar as last year. To increase the yield of expected isotopes with intensive 12C beam, all of the irradiation have been done at night, and typical beam intensities varied between 0. 4-0.6 particleμA. Each irradiation lasted 4-6 h. The procedure of preparing
文摘It is of special interest to search for those unknown α-emitters in the transuranium region which (i) are located along the path of α-decay chains that start in the superheavy element region, and (ii) establish a link to nuclides with known masses. The knowledge of all Qαvalues in an α-decay chain allows obtaining
文摘As radiochemical techniques have an unsurpassed sensitivity, they are best apt to search for, to identify and to determine very small α-decay branches of longer-lived transuranium nuclides. Therefore, we have developed a chemical separation scheme to search for the 'missing' α-decay branch in 239Cm (T1/2≈3 h). Details of the motivation for this experiment and preliminary results from the first experiments are given elsewhere in this report.
文摘The overall separation scheme to obtain a chemically purified Cm sample for the search of an α-decay branch in 239Cm (see for preliminary results) is described in Part Ⅰof this contribution. The Part Ⅱdescribes details of the liquid chromatographic separation of a Cm fraction - modeled with lanthanide (Ln) tracers. The main goal of the scheme was to produce fast, reliably and with a high and controllable yield Cm fractions which are free from unwanted α-activities. This separation scheme was not optimized to separate elements which may strongly interfere in γ-spectroscopic studies.
