Physics Letters B (Jan 2017)
Towards saturation of the electron-capture delayed fission probability: The new isotopes 240Es and 236Bk
- J. Konki,
- J. Khuyagbaatar,
- J. Uusitalo,
- P.T. Greenlees,
- K. Auranen,
- H. Badran,
- M. Block,
- R. Briselet,
- D.M. Cox,
- M. Dasgupta,
- A. Di Nitto,
- Ch.E. Düllmann,
- T. Grahn,
- K. Hauschild,
- A. Herzán,
- R.-D. Herzberg,
- F.P. Heßberger,
- D.J. Hinde,
- R. Julin,
- S. Juutinen,
- E. Jäger,
- B. Kindler,
- J. Krier,
- M. Leino,
- B. Lommel,
- A. Lopez-Martens,
- D.H. Luong,
- M. Mallaburn,
- K. Nishio,
- J. Pakarinen,
- P. Papadakis,
- J. Partanen,
- P. Peura,
- P. Rahkila,
- K. Rezynkina,
- P. Ruotsalainen,
- M. Sandzelius,
- J. Sarén,
- C. Scholey,
- J. Sorri,
- S. Stolze,
- B. Sulignano,
- Ch. Theisen,
- A. Ward,
- A. Yakushev,
- V. Yakusheva
Affiliations
- J. Konki
- University of Jyvaskyla, Department of Physics, P.O. Box 35, FI-40014 Jyvaskyla, Finland
- J. Khuyagbaatar
- Helmholtz Institute Mainz, 55099 Mainz, Germany
- J. Uusitalo
- University of Jyvaskyla, Department of Physics, P.O. Box 35, FI-40014 Jyvaskyla, Finland
- P.T. Greenlees
- University of Jyvaskyla, Department of Physics, P.O. Box 35, FI-40014 Jyvaskyla, Finland
- K. Auranen
- University of Jyvaskyla, Department of Physics, P.O. Box 35, FI-40014 Jyvaskyla, Finland
- H. Badran
- University of Jyvaskyla, Department of Physics, P.O. Box 35, FI-40014 Jyvaskyla, Finland
- M. Block
- Helmholtz Institute Mainz, 55099 Mainz, Germany
- R. Briselet
- IRFU, CEA, Université Paris-Saclay, 91191 Gif-sur-Yvette, France
- D.M. Cox
- Department of Physics, Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, UK
- M. Dasgupta
- Research School of Physics and Engineering, Australian National University, Canberra, ACT 2601, Australia
- A. Di Nitto
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
- Ch.E. Düllmann
- Helmholtz Institute Mainz, 55099 Mainz, Germany
- T. Grahn
- University of Jyvaskyla, Department of Physics, P.O. Box 35, FI-40014 Jyvaskyla, Finland
- K. Hauschild
- CSNSM, Université Paris Sud and CNRS-IN2P3, F-91405 Orsay Campus, France
- A. Herzán
- University of Jyvaskyla, Department of Physics, P.O. Box 35, FI-40014 Jyvaskyla, Finland
- R.-D. Herzberg
- Department of Physics, Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, UK
- F.P. Heßberger
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
- D.J. Hinde
- Research School of Physics and Engineering, Australian National University, Canberra, ACT 2601, Australia
- R. Julin
- University of Jyvaskyla, Department of Physics, P.O. Box 35, FI-40014 Jyvaskyla, Finland
- S. Juutinen
- University of Jyvaskyla, Department of Physics, P.O. Box 35, FI-40014 Jyvaskyla, Finland
- E. Jäger
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
- B. Kindler
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
- J. Krier
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
- M. Leino
- University of Jyvaskyla, Department of Physics, P.O. Box 35, FI-40014 Jyvaskyla, Finland
- B. Lommel
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
- A. Lopez-Martens
- CSNSM, Université Paris Sud and CNRS-IN2P3, F-91405 Orsay Campus, France
- D.H. Luong
- Research School of Physics and Engineering, Australian National University, Canberra, ACT 2601, Australia
- M. Mallaburn
- School of Physics and Astronomy, The University of Manchester, Manchester M13 9PL, UK
- K. Nishio
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
- J. Pakarinen
- University of Jyvaskyla, Department of Physics, P.O. Box 35, FI-40014 Jyvaskyla, Finland
- P. Papadakis
- University of Jyvaskyla, Department of Physics, P.O. Box 35, FI-40014 Jyvaskyla, Finland
- J. Partanen
- University of Jyvaskyla, Department of Physics, P.O. Box 35, FI-40014 Jyvaskyla, Finland
- P. Peura
- University of Jyvaskyla, Department of Physics, P.O. Box 35, FI-40014 Jyvaskyla, Finland
- P. Rahkila
- University of Jyvaskyla, Department of Physics, P.O. Box 35, FI-40014 Jyvaskyla, Finland
- K. Rezynkina
- CSNSM, Université Paris Sud and CNRS-IN2P3, F-91405 Orsay Campus, France
- P. Ruotsalainen
- University of Jyvaskyla, Department of Physics, P.O. Box 35, FI-40014 Jyvaskyla, Finland
- M. Sandzelius
- University of Jyvaskyla, Department of Physics, P.O. Box 35, FI-40014 Jyvaskyla, Finland
- J. Sarén
- University of Jyvaskyla, Department of Physics, P.O. Box 35, FI-40014 Jyvaskyla, Finland
- C. Scholey
- University of Jyvaskyla, Department of Physics, P.O. Box 35, FI-40014 Jyvaskyla, Finland
- J. Sorri
- University of Jyvaskyla, Department of Physics, P.O. Box 35, FI-40014 Jyvaskyla, Finland
- S. Stolze
- University of Jyvaskyla, Department of Physics, P.O. Box 35, FI-40014 Jyvaskyla, Finland
- B. Sulignano
- IRFU, CEA, Université Paris-Saclay, 91191 Gif-sur-Yvette, France
- Ch. Theisen
- IRFU, CEA, Université Paris-Saclay, 91191 Gif-sur-Yvette, France
- A. Ward
- Department of Physics, Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, UK
- A. Yakushev
- Helmholtz Institute Mainz, 55099 Mainz, Germany
- V. Yakusheva
- Helmholtz Institute Mainz, 55099 Mainz, Germany
- DOI
- https://doi.org/10.1016/j.physletb.2016.11.038
- Journal volume & issue
-
Vol. 764,
no. C
pp. 265 – 270
Abstract
The new neutron-deficient nuclei 240Es and 236Bk were synthesised at the gas-filled recoil separator RITU. They were identified by their radioactive decay chains starting from 240Es produced in the fusion–evaporation reaction 209Bi(34S,3n)240Es. Half-lives of 6(2)s and 22−6+13s were obtained for 240Es and 236Bk, respectively. Two groups of α particles with energies Eα=8.19(3)MeV and 8.09(3)MeV were unambiguously assigned to 240Es. Electron-capture delayed fission branches with probabilities of 0.16(6) and 0.04(2) were measured for 240Es and 236Bk, respectively. These new data show a continuation of the exponential increase of ECDF probabilities in more neutron-deficient isotopes.
Keywords
- Isotopes with mass 236–240
- 240Es
- 236Bk
- α decay
- Electron-capture delayed fission
- Fusion–evaporation reactions
