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International audienceBackground: While the N=50 shell-gap evolution towards Ni78 is presently in the focus of nuclear structure research, experimental information on the neutron effective single-particle energy sequence above the Ni78 core remain scarce. Direct nucleon-exchange reactions are indeed difficult with presently available post-accelerated radioactive-ion beams (especially for high orbital-momentum orbitals) in this exotic region. Purpose: In this study we probe the evolution of the ν1g7/2 effective single-particle energy which is a key to understanding the possible evolution of the spin-orbit splitting due to the proton-neutron interaction in the Ni78 region. To achieve this goal, a method based on lifetime measurements is used for the first time. The obtained lifetimes of the 7/21+ states in Kr87 and Se85 are used to investigate the ν1g7/2 evolution. Method: Yrast and near-yrast states in the light N=51 isotones Se85 and Kr87 were populated via multinucleon transfer reactions, using a Se82 beam and a U238 target at the LNL tandem-ALPI facility. The prompt γ rays were detected by the AGATA Demonstrator and particle identification was performed using the PRISMA spectrometer. Lifetime measurements were performed by using the Cologne plunger device for deep inelastic reactions and the Recoil Distance Doppler Shift technique. Results: We obtain τ(7/21+)=0.4−0.4+1.6 ps for Kr87. In the case of Se85 an upper limit of 3(2) ps is obtained for the τ7/21+ value. Conclusion: For Kr87, the measured (7/21+) lifetime is consistent with a core-coupled 2+⊗ν2d5/2 configuration for this state. This result is consistent with that obtained by direct reaction, which validates our method. For Se85, the measured 7/21+ lifetime limit indicates a very small contribution of the ν1g7/2 configuration to the wave function of this state

physical review. c

Neutron effective single-particle energies above <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Ni</mml:mi><mml:mprescripts /><mml:none /><mml:mn>78</mml:mn></mml:mmultiscripts></mml:math> : A hint from lifetime measurements in the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>N</mml:mi><mml:mo>=</mml:mo><mml:mn>51</mml:mn></mml:mrow></mml:math> isotones <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts…

Neutron effective single-particle energies above Ni78 : A hint from lifetime measurements in the N=51 isotones