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The shape of the Tz = +1 nucleus 94Pd and the role of proton-neutron interactions on the structure of its excited states
Institut für Kernphysik der Universität zu Köln, D-50937 Köln, Germany; GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, 64291 Darmstadt, Germany, Planckstr. 1.
GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, 64291 Darmstadt, Germany, Planckstr. 1; KTH Royal Institute of Technology, Stockholm, Sweden.
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Science and Engineering.ORCID iD: 0000-0003-1771-2656
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Science and Engineering.ORCID iD: 0000-0003-0212-7497
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Number of Authors: 852024 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 855, article id 138805Article in journal (Refereed) Published
Abstract [en]

Reduced transition probabilities have been extracted between excited, yrast states in the N=Z+2 nucleus 94Pd. The transitions of interest were observed following decays of the Iπ=14+, Ex=2129-keV isomeric state, which was populated following the projectile fragmentation of a 124Xe primary beam at the GSI Helmholtzzentrum für Schwerionenforschung accelerator facility as part of FAIR Phase-0. Experimental information regarding the reduced E2 transition strengths for the decays of the yrast 8+ and 6+ states was determined following isomer-delayed Eγ1−Eγ2−△T2,1 coincidence method, using the LaBr3(Ce)-based FATIMA fast-timing coincidence gamma-ray array, which allowed direct determination of lifetimes of states in 94Pd using the Generalized Centroid Difference (GCD) method. The experimental value for the half-life of the yrast 8+ state of 755(106) ps results in a reduced transition probability of B(E2:8→+6+) = 205−25+34 e2 fm4, which enables a precise verification of shell-model calculations for this unique system, lying directly between the N=Z line and the N=50 neutron shell closure. The determined B(E2) value provides an insight into the purity of (g9/2)n configurations in competition with admixtures from excitations between the (lower) N=3pf and (higher) N=4gds orbitals for the first time. The results indicate weak collectivity expected for near-zero quadrupole deformation and an increasing importance of the T=0 proton-neutron interaction at N=48.

Place, publisher, year, edition, pages
Elsevier BV , 2024. Vol. 855, article id 138805
Keywords [en]
Fast-timing γ-ray coincidences, Isovector vs. isoscalar pairing, pn interaction, Shell model, γ spectroscopy
National Category
Subatomic Physics Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:kth:diva-349933DOI: 10.1016/j.physletb.2024.138805ISI: 001281910600001Scopus ID: 2-s2.0-85196809064OAI: oai:DiVA.org:kth-349933DiVA, id: diva2:1881717
Note

QC 20240705

Available from: 2024-07-03 Created: 2024-07-03 Last updated: 2024-08-27Bibliographically approved

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Cederwall, BoAktas, Özge

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