Publikationsrepositorium - Helmholtz-Zentrum Dresden-Rossendorf

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First application of the Oslo method in inverse kinematics - Nuclear level densities and gamma-ray strength functions of 87Kr

Ingeberg, V. W.; Siem, S.; Wiedeking, M.; Sieja, K.; Zeiser, F.; Bleuel, D. L.; Brits, C. P.; Bucher, D. T.; Dinoko, T. S.; Easton, J. L.; Görgen, A.; Jones, P.; Kheswa, B. V.; Khumalo, N. A.; Larsen, A. C.; Lawrie, E. A.; Lawrie, J. J.; Majola, S. N. T.; Malatji, K. L.; Makhathini, L.; Maqabuka, B.; Negi, D.; Noncolela, S. P.; Papka, P.; Sahin, E.; Schwengner, R.; Tveten, G. M.; Zikhali, B. R.

Abstract

A novel technique for extracting the gamma-ray strength function (SF) and nuclear level density (NLD) from inverse kinematics experiments is presented, which allows for measurements of these properties, across a vast range of previously inaccessible nuclei. Proton-gamma coincidence events from the d(86Kr, p)87Kr reaction were measured at iThemba LABS and the SF and NLD in 87 Kr obtained with the Oslo Method.The SF and NLD are important parameters in Hauser-Feshbach calculations to constrain (n,gamma) cross sections of nuclei for which these cannot be measured directly. The extracted SF and NLD are used as input in Hauser-Feshbach calculations to constrain the 86Kr(n,gamma)87Kr cross section which is important for the 87Rb production in the s-process. The nature of the low-energy region of the SF is explored through comparison to shell model calculations with the LNPS-SDG interaction.

Keywords: Nuclear structure; nuclear reactions; (d; p) recation; inverse kinematics; gamma-ray strength function; level density; shell model; Hauser-Feshbach model; s-process

Permalink: https://www.hzdr.de/publications/Publ-25764