Speaker
Mr
Joonas Konki
(University of Jyväskylä)
Description
The neutron-deficient 240Es nucleus was synthesized for the first time using the fusion-evaporation reaction 209Bi(34S,3n)240Es at the Accelerator Laboratory of University of Jyväskylä (JYFL), Finland. The gas-filled recoil separator RITU [1] was used to separate the fusion-evaporation products from the primary and scattered beam. The radioactive decays originating from 240Es and its daughters, including the hitherto unknown 236Bk, were measured with the focal plane spectrometer GREAT [2].
Identification of 240Es was made on the basis of recoil-alpha-alpha correlated chains ending with the known granddaughter 236Cm. A significantly high electron-capture delayed fission (ECDF) probability was measured for 240Es [3]. The new isotope 236Bk that was populated in the alpha decay of 240Es was identified by its ECDF branch [3]. These new data show a continuation of the exponential increase of ECDF probabilities in more neutron-deficient isotopes. The results on the decay properties of 240Es and 236Bk together with the data analysis will be presented.
References:
[1] M. Leino et al., Nucl. Inst. Meth. Phys. Res. B 99, 653 (1995)
[2] R. D. Page et al, Nucl. Inst. Meth. Phys. Res. B 204, 634 (2003)
[3] J. Konki et al., Phys. Lett. B 764, 265 (2017)
Primary author
Mr
Joonas Konki
(University of Jyväskylä)
Co-authors
Dr
Alexander Yakushev
(GSI,Helmholz-Institut Mainz)
Dr
Andrej Herzán
(University of Jyväskylä)
Mr
Andrew Ward
(University of Liverpool)
Dr
Antonio Di Nitto
(GSI,University of Mainz)
Dr
Araceli Lopez-Martens
(CSNSM Orsay)
Dr
Barbara Sulignano
(CEA Saclay)
Dr
Bettina Lommel
(GSI)
Dr
Birgit Kindler
(GSI)
Dr
Catherine Scholey
(University of Jyväskylä)
Prof.
Christoph E. Düllmann
(GSI,Helmholz-Institut Mainz,University of Mainz)
Dr
Christophe Theisen
(CEA Saclay)
Dr
Daniel M. Cox
(University of Jyväskylä)
Prof.
David Hinde
(Australian National University)
Dr
Duc Huy Luong
(ANU)
Dr
Egon Jäger
(GSI)
Dr
Fritz Peter Heßberger
(GSI)
Mr
Hussam Badran
(University of Jyväskylä)
Dr
Jadambaa Khuyagbaatar
(GSI,Helmholz-Institut Mainz)
Dr
Jan Sarén
(University of Jyväskylä)
Dr
Janne Pakarinen
(University of Jyväskylä)
Mr
Jari Partanen
(University of Jyväskylä)
Dr
Juha Sorri
(University of Jyväskylä)
Dr
Juha Uusitalo
(University of Jyväskylä)
Dr
Jörg Krier
(GSI)
Dr
Kalle Auranen
(University of Jyväskylä)
Dr
Karl Hauschild
(CSNSM Orsay)
Dr
Katsuhisa Nishio
(Advanced Science Research Center, Japan Atomic Energy Agency)
Dr
Kseniia Rezynkina
(CSNSM Orsay)
Prof.
Mahananda Dasgupta
(ANU)
Prof.
Matti Leino
(University of Jyväskylä)
Prof.
Michael Block
(GSI,Helmholz-Institut Mainz,University of Mainz)
Mr
Michael Mallaburn
(University of Manchester)
Dr
Mikael Sandzelius
(University of Jyväskylä)
Dr
Panu Rahkila
(University of Jyväskylä)
Dr
Panu Ruotsalainen
(University of Jyvaskyla)
Prof.
Paul Thomas Greenlees
(University of Jyväskylä)
Dr
Pauli Peura
(University of Jyväskylä)
Dr
Philippos Papadakis
(University of Jyväskylä)
Dr
Raphael Briselet
(CEA)
Prof.
Rauno Julin
(University of Jyväskylä)
Prof.
Rolf-Dietmar Herzberg
(University of Liverpool)
Dr
Sakari Juutinen
(University of Jyväskylä)
Ms
Sanna Stolze
(University of Jyväskylä)
Dr
Tuomas Grahn
(University of Jyväskylä)
Dr
Vera Yakusheva
(GSI,Helmholz-Institut Mainz)