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Background: Kr50 is a neutron-rich nucleus amenable to shell model calculations due to the shell closure at N = 50. It is also produced as a fragment in the fissioning of actinides. Purpose: The level structure of Kr at low excitation energies needs additional investigation for detailed comparison with calculations from theoretical models. By determining the cross sections for transitions that feed directly the ground state of Kr a large fraction of the total cross section for the Kr(n, n)Kr reaction channel can be obtained. Methods: Low-spin states of Kr were populated in the Kr(n, nγ) reaction and were studied with the GEANIE Ge-detector array. The broad-spectrum pulsed neutron beam of the Los Alamos Neutron Science Center’s (LANSCE) WNR facility provided neutrons in the energy range from 1 to above 600 MeV. The time-of-flight technique was used to determine the incident-neutron energies. Results: Partial γ-ray cross sections were measured for 21 γ-rays of Kr and for neutron energies 1 MeV< En <20 MeV. A large part of the total cross section for the Kr(n, n)Kr reaction is observed. Ten transitions are observed for the first time and are placed on the level scheme at excitation energies below 3.7 MeV doubling the number of placed transitions up to this excitation energy. These transitions deexcite five previously known levels, among them the second and third 0 states, and one new level. The excitation energy of these levels was more accurately determined and the relative intensities of their decay paths were measured. All previously known levels up to 3.7 MeV excitation energy were identified, and the new level was added at 2917-keV excitation energy. Predictions from shell model calculations are compared with the data. PACS numbers: PACS number(s): 23.20.Lv, 25.40.Fq, 27.50.+e, 28.20.-v

Low-spin states in86Kr from the(n,n′)reaction