A low background spontaneous fission detection system

Becker, H.; Brandt, R.; Jungclas, H.; Lund, T.; Molzahn, D.

doi:10.1016/0029-554x(79)90331-8

Cited by 12 publications

(7 citation statements)

References 12 publications

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“…All the observed details of the spontaneous fission agree with the decay of 238 U: a) the energies of the fission fragments measured with the Si(Au) detector were: 70, 28, 24 MeV (in a thick sample); b) the correlated neutron multiplicities were 1,1,3 yielding υ -2.1; c) four single tracks were found in the mica detector with the following track lengths: 3.5, 10.5, 6.6, and 10.9 Mm; d) no V-type of track events were observed in mica. Such two-pronged V-type events could be due to ternary fission of SHE [8],…”

Section: Resultsmentioning

confidence: 98%

“…Only at the insertion of CdSprobes (exp. Ill and IV) this background increased somewhat due to the γ-activity of the sample [8].…”

Section: )mentioning

confidence: 94%

“…Finally, a fission fragment track must be observed in mica track detectors before the coincident event is considered a "true spontaneous fission event". The background of our system has been shown to be zero spontaneous fission events in about two years [7,8]. Preliminary results of these experiments have already been described [9, 10].…”

Section: Introductionmentioning

confidence: 91%

“…(For typical pictures, see Ref. [8]). We consider one fission event being detected when all the following criteria are met:…”

Section: The Counting Systemmentioning

confidence: 99%

“…This system is shown schematically in Fig. 1 and described in detail elsewhere [8]. In principle, the counter operates as follows:…”

Section: The Counting Systemmentioning

confidence: 99%

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Upper Limits for the Production of Superheavy Elements in the Reaction of ¹³⁶Xe with ^nat. U

1979

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We tried to produce superheavy elements (SHE) in deepinelastic reactions of 136 Xe with nat U. Four irradiations of thick U-targets with increasing beam intensities (i. e. temperatures in the target) were performed. After a chemical separation sulfide precipitates were obtained. The spontaneous fission activity was determined by fission fragment/fission neutron coincidence counting with a lowbackground detector. We observed zero spontaneous fission decays due to superheavy elements in about two years counting time. This yields an upper limit for the production of SHE of < 1 · 10"" cm 2 in the half-life range of 1 to 200 day. Furthermore, the production cross-section of some actinoides was obtained.

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Section: Resultsmentioning

confidence: 98%

“…Only at the insertion of CdSprobes (exp. Ill and IV) this background increased somewhat due to the γ-activity of the sample [8].…”

Section: )mentioning

confidence: 94%

Section: Introductionmentioning

confidence: 91%

“…(For typical pictures, see Ref. [8]). We consider one fission event being detected when all the following criteria are met:…”

Section: The Counting Systemmentioning

confidence: 99%

“…This system is shown schematically in Fig. 1 and described in detail elsewhere [8]. In principle, the counter operates as follows:…”