GSI Experiments on the Synthesis of superheavy Elements

被引：11

作者：

Hessberger, FP ^{[1
]}

Hofmann, S ^{[1
]}

Ninov, V ^{[1
]}

Armbruster, P ^{[1
]}

Folger, H ^{[1
]}

Lavrentev, A ^{[1
]}

Leino, ME ^{[1
]}

Munzenberg, G ^{[1
]}

Popeko, AG ^{[1
]}

Saro, S ^{[1
]}

Stodel, C ^{[1
]}

Yeremin, AN ^{[1
]}

机构：

[1] Gesell Schwerionenforsch GmbH, D-64291 Darmstadt, Germany

来源：

TOURS SYMPOSIUM ON NUCLEAR PHYSICS III | 1998年 / 425期

关键词：

D O I：

10.1063/1.55134

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Evaporation residue production was investigated at SHIP in cold fusion reactions of Pb-and Bi-target nuclei with projectiles of elements between Ti (Z=22) and Se (Z=34) leading to compound nuclei Z(CN) = 104-116. The isotopes (269)110, (272)110, 272(111), and (277)112 Of the elements Z=110, Z=111 and Z=112 were unambiguously identified for the first time in bombardments of Pb-208, Bi-209 with Ni-62,Ni-64 and Zn-70. Excitation functions for Ti-50 + Pb-208 and Fe-58 + Pb-208 were measured with high precision, three new spontaneous fission (sf) activities (253)104, (254)104, (258)106 were identified. A small alpha -decay branch of the even even nucleus (256)104 (b(alpha) approximate to 0.003) was confirmed, allowing to estimate mass excesses Delta mc(2) for N-Z = 48 nuclei up to (264)Hs (Z=108). A, analysis of the a-decay chains observed in a bombardment of Bi-209 With Fe-58 projectiles showed evidence for an isomeric state in (266)Mt (Z=109). We further report on an attempt to produce element 116 and a second isotope of element 112 by the reactions Se-82 + Pb-208 and Zn-68 + Pb-208, respectively.

引用

页码：3 / 15

页数：13

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