München 2019 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 60: Nuclear Astrophysics V

HK 60.3: Vortrag

Freitag, 22. März 2019, 14:45–15:00, HS 16

Towards background-free studies of capture reactions in a heavy-ion storage ring — •L. Varga, J. Glorius, Yu. A. Litvinov, Z. Slavkovska, and Y. M. Xing — GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany

In 2016, the first measurement of the 124Xe(p,γ)125Cs reaction was performed at the Experimental Storage Ring (ESR) at GSI. Using Double Sided Silicon Strip Detectors (DSSSD) the 125Cs reaction products have been successfully detected [1]. In order to increase the sensitivity of this method, the signal-to-background ratio has to be improved. In addition to the spatial distribution of the measured ion-hits, using the energy information of the Si detector the particle identification technique for highly charged ions can be optimized.

In this talk, a clear assignment of each events to a p- and n-side strip pair of the DSSSD is introduced. Then, the intrinsic calibration of the detector is presented by performing gain-matching for all individual segments. At last, the deposited energy of the detected ions is reconstructed considering the inter-strip effects for each side of the Si detector. MonteCarlo simulations show, by combining the energy resolution and an additional slit system at ESR, background-free measurements of the p-capture products can be accomplished. This method could provide an unrivaled opportunity for precision (p,g) reaction studies in the Gamow-window using stored and cooled, highly charged, radioactive ions.

[1] J.Glorius et. al., J. Phys: Conf Ser 875(2017)092015