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Capture cross sections on unstable nuclei

par Tonchev, Anton A.P.;Escher, Jutta;Scielzo, Nicholas;Bedrossian, Peter;Ilieva, R.S.;Humby, P.;Cooper, Nigel N.R.;Goddard, Philip P.M.;Werner, Volker;Tornow, Werner;Rusev, Gencho;Kelley, John J.H.;Pietralla, Norbert;Scheck, M;Savran, Deniz;Löher, Bastian;Yates, Steven S.W.;Crider, Benjamin B.P.;Peters, E.E.;Tsoneva, Nadia;Goriely, Stéphane
Référence EPJ web of conferences, 146, 01013
Publication Publié, 2017-09

Article révisé par les pairs

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Résumé :

Accurate neutron-capture cross sections on unstable nuclei near the line of beta stability are crucial for understanding the s-process nucleosynthesis. However, neutron-capture cross sections for short-lived radionuclides are difficult to measure due to the fact that the measurements require both highly radioactive samples and intense neutron sources. Essential ingredients for describing the γ decays following neutron capture are the γ-ray strength function and level densities. We will compare different indirect approaches for obtaining the most relevant observables that can constrain Hauser-Feshbach statistical-model calculations of capture cross sections. Specifically, we will consider photon scattering using monoenergetic and 100% linearly polarized photon beams. Challenges that exist on the path to obtaining neutron-capture cross sections for reactions on isotopes near and far from stability will be discussed.