First measurement of the Ru-96(p,gamma)Rh-97 cross section for the p process with a storage ring

Bo Mei, Thomas Aumann, Shawn Bishop, Klaus Blaum, Konstanze Boretzky, Fritz Bosch, Carsten Brandau, Harald Braeuning, Thomas Davinson, Iris Dillmann, Christina Dimopoulou, Olga Ershova, Zsolt Fueloep, Hans Geissel, Jan Glorius, Gyoergy Gyuerky, Michael Heil, Franz Kaeppeler, Aleksandra Kelic-Heil, Christophor KozhuharovChristoph Langer, Tudi Le Bleis, Yuri Litvinov, Gavin Lotay, Justyna Marganiec, Gottfried Muenzenberg, Fritz Nolden, Nikolaos Petridis, Ralf Plag, Ulrich Popp, Ganna Rastrepina, Rene Reifarth*, Bjoern Riese, Catherine Rigollet, Christoph Scheidenberger, Haik Simon, Kerstin Sonnabend, Markus Steck, Thomas Stoehlker, Tamas Szuecs, Klaus Suemmerer, Guenter Weber, Helmut Weick, Danyal Winters, Natalya Winters, Philip Woods, Qiping Zhong

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

43 Citations (Scopus)
14 Downloads (Pure)


This work presents a direct measurement of the Ru-96(p,gamma)Rh-97 cross section via a novel technique using a storage ring, which opens opportunities for reaction measurements on unstable nuclei. A proof-of-principle experiment was performed at the storage ring ESR at GSI in Darmstadt, where circulating Ru-96 ions interacted repeatedly with a hydrogen target. The Ru-96(p,gamma)Rh-97 cross section between 9 and 11 MeV has been determined using two independent normalization methods. As key ingredients in Hauser-Feshbach calculations, the gamma-ray strength function as well as the level density model can be pinned down with the measured (p,gamma) cross section. Furthermore, the proton optical potential can be optimized after the uncertainties from the gamma-ray strength function and the level density have been removed. As a result, a constrained Ru-96(p,gamma)Rh-97 reaction rate over a wide temperature range is recommended for p-process network calculations.

Original languageEnglish
Article number035803
Number of pages8
JournalPhysical Review C
Issue number3
Publication statusPublished - 2-Sep-2015


  • IONS
  • ESR

Cite this