## Abstract

*N*=

*Z*+ 2 nucleus

^{94}Pd. The transitions of interest were observed following decays of the

*I*= 14

^{π}^{+},

*E*= 2129-keV isomeric state, which was populated following the projectile fragmentation of a

_{x}^{124}Xe 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

*E*coincidence method, using the LaBr

_{γ1}− E_{γ2}− △T_{2,1}_{3}(Ce)-based FATIMA fast-timing coincidence gamma-ray array, which allowed direct determination of lifetimes of states in

^{94}Pd 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

^{+34}

_{−25}e

^{2}fm

^{4}, 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 (g

_{9/2})

*configurations in competition with admixtures from excitations between the (lower)*

^{n}*N*= 3 pf and (higher)

*N*= 4 gds 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.

Original language | English |
---|---|

Article number | 138805 |

Journal | Physics Letters B |

Volume | 85513 |

DOIs | |

Publication status | Published - 19 Jun 2024 |

## Keywords

- γ spectroscopy
- fast timing
- pn interacion
- isovector vs. isoscalar pairing
- shell model

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_{z}= +1 nucleus

^{94}Pd and the role of proton-neutron interactions on the structure of its excited states'. Together they form a unique fingerprint.