The Reaction Ca+U 112 studied at the GSI-SHIP
GSI-SHIPにおける融合反応Ca+U 112の研究
Hofmann, S.*; Ackermann, D.*; Antalic, S.*; Burkhard, H. G.*; Comas, V. F.*; Dressler, R.*; Gan, Z.*; Heinz, S.*; Heredia, J. A.*; Heberger, F. P.*; Khuyagbaatar, J.*; Kindler, B.*; Kojouharov, I.*; Kuusiniemi, P.*; Leino, M.*; Lommel, B.*; Mann, R.*; Mnzenberg, G.*; 西尾 勝久 ; Popeko, A. G.*; Saro, S.*; Schtt, H. J.*; Streicher, B.*; Sulignano, B.*; Uusitalo, J.*; Venhart, M.*; Yeremin, A. V.*
Hofmann, S.*; Ackermann, D.*; Antalic, S.*; Burkhard, H. G.*; Comas, V. F.*; Dressler, R.*; Gan, Z.*; Heinz, S.*; Heredia, J. A.*; Heberger, F. P.*; Khuyagbaatar, J.*; Kindler, B.*; Kojouharov, I.*; Kuusiniemi, P.*; Leino, M.*; Lommel, B.*; Mann, R.*; Mnzenberg, G.*; Nishio, Katsuhisa; Popeko, A. G.*; Saro, S.*; Schtt, H. J.*; Streicher, B.*; Sulignano, B.*; Uusitalo, J.*; Venhart, M.*; Yeremin, A. V.*
The fusion reaction of Ca projectiles withU target nuclei was studied at the velocity filter SHIP of GSI. Two decay chains were measured, which fully confirm data that were previously assigned to the isotope 112 in experiments at the Flerov Laboratory in Dubna. Two other events are consistent with a 50% spontaneous fission (SF) branch of this isotope. The mean value obtained for the half-life of 112 is (6.9) s, the energy is (9.5200.015) MeV, and the total kinetic energy (TKE) of SF is (23814) MeV. The half-life of the decay daughter nucleus Ds is (0.18) s, and the TKE of SF is (210) MeV. The cross-section deduced from all four events is (0.72) pb, measured at an excitation energy of 34.6 MeV of the compound nucleus 112.