TY  - JOUR
A1  - Varga, Laszlo
A1  - Davinson, Thomas
A1  - Glorius, Jan
A1  - Jurado, Beatrix
A1  - Langer, Christoph
A1  - Lederer-Woods, Claudia
A1  - Litvinov, Yuri A.
A1  - Reifarth, Rene
A1  - Slavkovska, Zuzana
A1  - Stöhlker, Thomas
A1  - Woods, Phil J.
A1  - Xing, Yuan Ming
T1  - Towards background-free studies of capture reaction in a heavy-ion storage ring
JF  - Journal of Physics: Conference Series
N2  - Stored and cooled, highly-charged ions offer unprecedented capabilities for precision studies in the realm of atomic, nuclear structure and astrophysics[1]. After the successful investigation of the 96Ru(p,7)97Rh reaction cross section in 2009[2], the first measurement of the 124Xe(p,7)125Cs reaction cross section has been performed with decelerated, fully-ionized 124Xe ions in 2016 at the Experimental Storage Ring (ESR) of GSI[3]. Using a Double Sided Silicon Strip Detector, introduced directly into the ultra-high vacuum environment of a storage ring, the 125Cs proton-capture products have been successfully detected. The cross section has been measured at 5 different energies between 5.5AMeV and 8AMeV, on the high energy tail of the Gamow-window for hot, explosive scenarios such as supernovae and X-ray binaries. The elastic scattering on the H2 gas jet target is the major source of background to count the (p,7) events. Monte Carlo simulations show that an additional slit system in the ESR in combination with the energy information of the Si detector will enable background free measurements of the proton-capture products. The corresponding hardware is being prepared and will increase the sensitivity of the method tremendously.
Y1  - 2020
VL  - 1668
IS  - Art 012046
PB  - IOP
CY  - Bristol
ER  - 
TY  - JOUR
A1  - Henriques, A.
A1  - Jurado, B.
A1  - Grieser, M.
A1  - Denis-Petit, D.
A1  - Chiron, T.
A1  - Gaudefroy, L.
A1  - Glorius, J.
A1  - Langer, Christoph
A1  - Litvinov, Yu. A.
A1  - Mathieu, L.
A1  - Meot, V.
A1  - Perez-Sanchez, R.
A1  - Pibernat, J.
A1  - Reifarth, R.
A1  - Roig, O.
A1  - Thomas, B.
A1  - Thomas, B. A.
A1  - Thomas, J. C.
A1  - Tsekhanovich, I.
T1  - Indirect measurements of neutron cross-secti at heavy-ion storage rings
JF  - Journal of Physics: Conference Series
N2  - Cross sections for neutron-induced reactions of short-lived nuclei are essential for nuclear astrophysics since these reactions in the stars are responsible for the production of most heavy elements in the universe. These reactions are also key in applied domains like energy production and medicine. Nevertheless, neutron-induced cross-section measurements can be extremely challenging or even impossible to perform due to the radioactivity of the targets involved. Indirect measurements through the surrogate-reaction method can help to overcome these difficulties.

The surrogate-reaction method relies on the use of an alternative reaction that will lead to the formation of the same excited nucleus as in the neutron-induced reaction of interest. The decay probabilities (for fission, neutron and gamma-ray emission) of the nucleus produced via the surrogate reaction allow one to constrain models and the prediction of the desired neutron cross sections.

We propose to perform surrogate reaction measurements in inverse kinematics at heavy-ion storage rings, in particular at the CRYRING@ESR of the GSI/FAIR facility. We present the conceptual idea of the most promising setup to measure for the first time simultaneously the fission, neutron and gamma-ray emission probabilities. The results of the first simulations considering the 238U(d,d') reaction are shown, as well as new technical developments that are being carried out towards this set-up.
Y1  - 2020
U6  - http://dx.doi.org/10.1088/1742-6596/1668/1/012019
VL  - 1668
IS  - Art. 012019
PB  - IOP
CY  - Bristol
ER  -