Structure of 68As studied via the 12C( 58Ni,pn) reaction

• Published in: Nuclear physics. A 1998-12, Vol.644 (3), p.141-161
• Main Authors: Sohler, D., Dombrádi, Zs, Brant, S., Cederkäll, J., Lipoglavšek, M., Palacz, M., Paar, V., Persson, J., Atac, A., Fahlander, C., Grawe, H., Johnson, A., Kerek, A., Klamra, W., Kownacki, J., Likar, A., Norlin, L.-O., Nyberg, J., Schubart, R., Seweryniak, D., de Angelis, G., Bednarczyk, P., Foltescu, D., Jerrestam, D., Juutinen, S., Mäkelä, E., Nyakó, B.M., de Poli, M., Roth, H.A., Shizuma, T., Skeppstedt, Ö., Sletten, G., Törmänen, S.
• Format: Article
• Language: English
• Subjects: 11 element 1γ neutron wall; 12C( 58Ni,pn), E = 261 MeV; 15 Ge+BGO anti-Compton spectrometers; 21 element 4π Si charged particle detector array; 30 BaF 2 detectors; 68As deduced levels, J, π; Enriched targets; Interacting boson-fermion-fermion model calculations; Measured Eγ, Iγ, γγ particle coin., angular distribution ratios
• ISSN: 0375-9474
• DOI: 10.1016/S0375-9474(98)00575-2

Excited states of 68As nucleus were populated through the 12C( 58Ni,pn) reaction and investigated by in-beam γ-spectroscopic methods. The NORDBALL detector array equipped with charged particle and neutron detectors was used to detect the evaporated particles and γ-rays. The level scheme of 68As was constructed on the basis of γγ-coincidence relations up to 6 MeV excitation energy and J π = (15 +). The structure of the nucleus is discussed in the framework of the interacting boson-fermion-fermion model. The states below 2.3 MeV are described as members of proton-neutron-phonon multiplets.