https://doi.org/10.1140/epja/s10050-020-00029-8
Regular Article - Experimental Physics
Search for proton emission of the isomeric 
state in 
Ni
1
Institut für Kernphysik, Universität zu Köln, Zülpicher Straße 77, 50937, Köln, Germany
2
Department of Physics, Lund University, 22100, Lund, Sweden
3
Instituto de Estructura de la Materia CSIC, 28006, Madrid, Spain
* e-mail: preiter@ikp.uni-koeln.de
Received:
5
June
2019
Accepted:
22
November
2019
Published online:
24
January
2020
Several experiments were conducted at the 10 MV Van-de-Graaff tandem accelerator at the Institute of Nuclear Physics, Cologne, to detect proton emission from the isomeric 6457-keV 
state in 
. Excitation functions for two fusion–evaporation reactions were measured to maximise the population of the rare two-neutron evaporation channel from a 
compound nucleus. The search for delayed proton emission was based on the 
(
) reaction at a beam energy of 70 MeV. For this reaction, a cross-section limit for the population of the state in and its proton-decay branch was determined to be 
nb.
© The Author(s), 2020
