Dr
Joonas Ojala
(University of Liverpool)
Shape coexistence is a phenomenon in which the same nuclei can possess different macroscopic shapes. The alpha-decay study for Pb-186 have shown a unique triplet of 0+ states which has been associated with spherical, prolate and oblate shapes [1]. Collective bands built upon these deformed 0+ states have been observed in in-beam gamma-ray spectroscopy experiments [2; 3]. However, gamma-ray spectroscopy can not probe E0 transitions which proceed primarily through internal conversion. These transitions are typically present in nuclei featuring shape coexistence.
Simultaneous conversion electron and gamma-ray studies for Pb-186 have been conducted exploiting the SAGE spectrometer [4] and the recoil-decay tagging technique, employing a 106Pd(83Kr,3n)186Pb fusion-evaporation reaction. The experiment was performed in 2013 at the Accelerator Laboratory of the University of Jyväskylä.
As a result of this experiment, direct feeding of the first excited 0+ state, which allowed us to reassign the shapes of the excited 0+ states in the Pb-186. Also, the 0+ -> 0+ transitions from the excited 0+ states to ground state, the E0 transitions of the 2+ -> 2+ and the 4+ -> 4+ transitions were observed. These results have been published in Communication Physics [5]. This work introduces a way to have systematic studies of E0 transitions in this region.
References
[1] A. N. Andreyev et al. Nature, 405:430 (2000).
[2] J. Heese et al. Phys. Lett. B, 302, 4:390 (1993).
[3] J. Pakarinen et al. Phys. Rev. C, 72:011304 (2005).
[4] J. Pakarinen et al. Eur. Phys. J. A, 50, 3:53 (2014).
[5] J. Ojala et al. Commun. Phys.5:1 (2022).
Dr
Joonas Ojala
(University of Liverpool)
Dr
Janne Pakarinen
(University of Jyväskylä)
Dr
Juha Sorri
(University of Jyväskylä)
Dr
Mikael Sandzelius
(University of Jyvaskyla)
Dr
Daniel M. Cox
(University of Jyväskylä)
Dr
Kalle Auranen
(University of Jyväskylä)
Dr
Hussam Badran
(University of Jyväskylä)
Dr
Paul Davies
(University of York)
Prof.
Rolf-Dietmar Herzberg
(University of Liverpool)
Dr
Joshua Hilton
(University of Jyväskylä)
Dr
Ulrika Jakobson
(University of Jyväskylä)
Prof.
David T. Joss
(University of Liverpool)
Prof.
Rauno Julin
(University of Jyväskylä)
Dr
Sakari Juutinen
(University of Jyväskylä)
Dr
Joonas Konki
(University of Jyväskylä)
Prof.
Matti Leino
(University of Jyväskylä)
M.
Jarkko Liimatainen
(University of Jyväskylä)
Dr
Christopher G. McPeake
(University of Jyväskylä)
M.
Olavi Neuvonen
(University of Jyväskylä)
Prof.
Robert D. Page
(University of Liverpool)
Dr
Edward Parr
(University of Liverpool)
M.
Jari Partanen
(University of Jyväskylä)
Dr
Pauli Peura
(University of Jyväskylä)
Dr
Jan Sarén
(University of Jyväskylä)
Dr
Scholey Catherine
(University of Jyväskylä)
Dr
Sanna Stolze
(University of Jyväskylä)
Dr
Juha Uusitalo
(University of Jyväskylä)
Dr
Andrew Ward
(University of Liverpool)
Dr
Robert Wadsworth
(University of York)
Dr
Panu Rahkila
(University of Jyväskylä)
Dr
John Revill
(University of Liverpool)
Dr
Tuomas Grahn
(University of Jyväskylä)
Prof.
Paul Greenlees
(University of Jyväskylä)
Dr
Jack Henderson
(University of York)
Dr
Andrej Herzán
(University of Jyväskylä)
Prof.
David G. Jenkins
(University of York)
Prof.
Tibor Kibédi
(Australian National University)
Dr
Gregory J. Lane
(Australian National University)
Dr
Panu Ruotsalainen
(University of Jyväskylä)
Dr
Papadakis Philippos
(University of Jyväskylä)
