Mar 24 – 25, 2022
Europe/Paris timezone

In-beam γ-ray spectroscopy of 94Ag

Mar 25, 2022, 4:15 PM


Dr Xesus Pereira-Lopez


X. Pereira-López$^{1,2}$, M.A. Bentley$^{2}$, R. Wadsworth$^{2}$, P. Ruotsalainen$^{3}$, S.M. Lenzi$^{4,5}$, U. Forsberg$^{2,6}$, K. Auranen$^{3}$, A. Blazhev$^{7}$, B. Cederwall$^{8}$, T. Grahn$^{3}$, P. Greenlees$^{3}$, A. Illana$^{3}$, D.G. Jenkins$^{2}$, R. Julin$^{3}$, H. Jutila$^{3}$, S. Juutinen$^{3}$, X. Liu$^{8}$, R. Llewelyn$^{2}$, M. Luoma$^{3}$, K. Moschner$^{7}$, C. Müller-Gatermann$^{7}$, B.S. Nara Singh$^{9,10}$, F. Nowacki$^{11}$, J. Ojala$^{3}$, J. Pakarinen$^{3}$, P. Papadakis$^{12}$, P. Rahkila$^{3}$, J. Romero$^{3,13}$, M. Sandzelius$^{3}$, J. Sarén$^{3}$, H. Tann$^{3,13}$, S. Uthayakumaar$^{2}$, J. Uusitalo$^{3}$, J.G. Vega-Romero$^{2}$, J.M. Vilhena$^{9}$, R. Yajzey$^{2,14}$, W. Zhang$^{8}$ and G. Zimba$^{3}$.

$^{1}$Center for Exotic Nuclear Studies, Institute for Basic Science (IBS), Daejeon 34126, Republic of Korea.
$^{2}$Department of Physics, University of York, Heslington, York YO10 5DD, United Kingdom.
$^{3}$Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland.
$^{4}$Dipartimento di Fisica e Astronomia “Galileo Galilei”, Università di Padova, I-35131 Padova, Italy.
$^{5}$INFN, Sezione di Padova, I-35131 Padova, Italy.
$^{6}$Department of Physics, Lund University, SE-22100 Lund, Sweden.
$^{7}$University of Köln, Department of Physics, Zülpicher Str.77, 50937 Köln, Germany.
$^{8}$Department of Physics, KTH-Royal Institute of Technology, SE-10691 Stockholm, Sweden.
$^{9}$School of Computing Engineering and Physical Sciences, University of the West of Scotland, Paisley, PA12BE, United Kingdom.
$^{10}$School of Physics and Astronomy, Schuster Laboratory,Brunswick Street, Manchester M13 9PL, United Kingdom.
$^{11}$Université de Strasbourg, F-67037 Strasbourg, France.
$^{12}$STFC Daresbury Laboratory, Daresbury, Warrington, WA4 4AD, United Kingdom.
$^{13}$Department of Physics, Oliver Lodge Laboratory,University of Liverpool, Liverpool L69 7ZE, United Kingdom.
$^{14}$Department of Physics, Faculty of Science, Jazan University, Jazan 45142, Saudi Arabia.

The formal concept of isospin has been introduced to explain the apparent exchange symmetry between neutrons and protons. However, if the nuclear force were the same for protons and neutrons properties such as masses and excitation energies would depend only on the mass number A. Recent studies have shown that the Coulomb force cannot account for all deviations, suggesting that other isospin-symmetry-breaking components must be present. N⁓Z systems present the perfect testing ground to probe isospin symmetry phenomena [1-3]. In particular, pairing correlations have a significant importance in the description of the nuclear structure of N=Z nuclei, where protons and neutrons are arranged occupying the same orbits, allowing T=0 np pairing in addition to the normal T=1. It was recently suggested that spin-aligned T=0 np pairs dominate the wavefunction of the y-rast sequence in $^{92}$Pd [4]. Subsequent theoretical studies were devoted to probe the contribution of np pairs in other N=Z A>90 nuclei [5-6], suggesting that a similar pairing scheme strongly influences the structure of these nuclei. In an effort to further understand the influence of np pairing in self-conjugate nuclei, a recoil beta tagging experiment has been performed to try and identify the excited T=0 and T=1 states in odd-odd N=Z $^{94}$Ag using the $^{40}$Ca($^{58}$Ni,p3n)$^{94}$Ag reaction. The experiment was conducted using MARA recoil separator and JUROGAM3 array at the Accelerator Laboratory of the University of Jyväskylä.

The detailed goals of the experiment, the setup, tentatively identified transitions, experimental CED and nuclear shell model predictions will be shown in this presentation. A preliminary interpretation of the experimental results will also be discussed.

[1] K. Wimmer, et al., Phys. Rev. Lett. 126, 072501 (2021).
[2] R.D.O. Llewellyn, et al., Phys. Lett. B 797, 135873 (2019).
[3] A. Boso, et al., Phys. Lett. B 797, 134835 (2019).
[4] B. Cederwall, et al., Nature 469, 6871 (2011).
[5] G.J. Fu, et al., Phys. Rev. C 87, 044312 (2013).
[6] Z.X. Xu, et al., Nucl. Phys. A 877 (2012) 51-58.

Primary authors

Dr Xesus Pereira-Lopez Prof. Michael Bentley (University of York) Prof. Robert Wadsworth (University of York)

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