Search for superheavy elements in meteorites

Search for Superheavy Elements in the Nature

“…Values of 1.5 to 3 had been obtained experimentally [75]. Also Flerov et al [17,44,56] feel that the neutron multiplicity 6 can be expected in the order of magnitude of 2 to 5.…”

“…Nevertheless, a clear conclusion on the presence of SHE in these meteorites cannot yet be drawn [75]. The experimental data allow the authors to estimate the half time of SHE in the limits of (3 < /i < 6)x 10 8 years and the concentration of the SHE in the samples at the present time at 5 x 10~1 4 g per g of sample material.…”

“…A great number of investigations had been carried out at extraterrestrial samples of the Allende meteorite [39,40,75,[99][100][101]. In [99] we read: "The careful examination of various sources of the background showed that neither the spontaneous fission of the uranium which exists in the meteorite samples, nor cosmic radiation, nor the equipment background can explain the effect observed.…”

“…Special scintillation counting tubes [39,75] In [42,55,76] it is reported on neutron multiplicity measurements by means of 3 He-counting tubes.…”

The Search for Superheavy Elements

“…The Dubna group [38][39][40] [41][42][43][44] had previously found evidence for anomalous isotopie ratios for xenon isotopes which were interpreted as the result of spontaneous fission decay of a now-extinct, volatile SHE. The latter hypothesis was met with criticism, see e.g.…”