Short-Lived Isotopes of Transfermium Elements: Studying Characteristics of Spontaneous Fissioning

A. I. Svirikhin; A. V. Yeremin; A. V. Andreev; I. N. Izosimov; A. V. Isaev; A. N. Kuznetsov; A. A. Kuznetsova; O. N. Malyshev; A. G. Popeko; Y. A. Popov; E. A. Sokol; M. L. Chelnokov; V. I. Chepigin; T. M. Schneidman; B. Gall; O. Dorvaux; P. Brione; K. Hauschild; A. Lopez-Martenz; K. Rezynkina; S. Mullins; P. Jones; P. Mosat; B. Andel; Z. Kalaninova; M. Z. Asfari; N. Yoshihiro; J. Piot; E. Stefanova; D. Tonev

doi:10.3103/S1062873818060308

Short-Lived Isotopes of Transfermium Elements: Studying Characteristics of Spontaneous Fissioning

Authors: Svirikhin A.I.¹, Yeremin A.V.¹, Andreev A.V.¹, Izosimov I.N.¹, Isaev A.V.¹, Kuznetsov A.N.¹, Kuznetsova A.A.¹, Malyshev O.N.¹, Popeko A.G.¹, Popov Y.A.¹, Sokol E.A.¹, Chelnokov M.L.¹, Chepigin V.I.¹, Schneidman T.M.¹, Gall B.², Dorvaux O.², Brione P.², Hauschild K.³, Lopez-Martenz A.³, Rezynkina K.³, Mullins S.⁴, Jones P.⁴, Mosat P.⁵, Andel B.⁵, Kalaninova Z.⁵, Asfari M.Z.⁵, Yoshihiro N.⁶, Piot J.⁷, Stefanova E.⁸, Tonev D.⁸
Affiliations:
1. Joint Institute for Nuclear Research
2. IPHC
3. CSNSM
4. iThemba LABS
5. Comenius University
6. Kyushu University
7. GANIL
8. INRNE
Issue: Vol 82, No 6 (2018)
Pages: 632-636
Section: Article
URL: https://journal-vniispk.ru/1062-8738/article/view/185403
DOI: https://doi.org/10.3103/S1062873818060308
ID: 185403

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series of experiments performed in 2014–2015 using the SHELS separator and a beam of multicharged ions from the U-400 accelerator at the Flerov Laboratory of Nuclear Reactions (Joint Institute for Nuclear Research) in Dubna is described. In preparation for a large program of experiments with a beam of highly charged ions of ⁵⁰Ti, an experiment is performed to study the spontaneous fissioning (SF) of short-lived neutron-deficient isotope ²⁵⁶Rf formed in complete fusion reaction⁵⁰Ti + ²⁰⁸Pb = ²⁵⁶Rf + 2n. The half-life of ²⁵⁶Rf is measured along with the probability of its SF decay. The average number of neutrons per one event of ²⁵⁶Rf SF (\(\bar v\)= 4.47 ± 0.09) is obtained for the first time. The results from experiments to study the SF of short-lived neutron-deficient isotopes synthesized in complete fusion reaction ⁴⁸Ca + ²⁰⁴Pb → ²⁵²No* are presented as well. Two short-lived activities attributed to the SF of the ground and isomeric states of ²⁵⁰No are revealed. The half-life, total kinetic energies of fission fragments, and neutron multiplicities are measured for the obtained short-lived nuclei. The average numbers of neutrons per one SF event are \(\bar v\)= 4.38 ± 0.13 and \(\bar v\)= 3.90 ± 0.20, respectively, for SF activity with t_1/2 = 5.1 ± 0.3 and t_1/2 = 36 ± 3 μs.

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Short-Lived Isotopes of Transfermium Elements: Studying Characteristics of Spontaneous Fissioning

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