First measurement of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi mathvariant="normal">Ru</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>96</mml:mn></mml:mrow></mml:mmultiscripts><mml:mo>(</mml:mo><mml:mrow><mml:mi>p</mml:mi><mml:mo>,</mml:mo><mml:mi>γ</mml:mi></mml:mrow><mml:mo>)</mml:mo><mml:mmultiscripts><mml:mi mathvariant="normal">Rh</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>97</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>cross se

Mei, B.; Aumann, T.; Bishop, S.; Blaum, Klaus; Boretzky, K.; Bosch, F.; Brandau, C.; Bräuning, H.; Davinson, T.; Dillmann, I.; Dimopoulou, Christina; Ershova, O.; Fülöp, Zsolt; Geißel, H.; Glorius, J.; Gyürky, György; Heil, M.; Käppeler, F.; Kelić-Heil, A.; Kozhuharov, C.; Langer, C.; Bleis, T. Le; Litvinov, Yu. A.; Lotay, G.; Marganiec, J.; Münzenberg, G.; Nolden, F.; Petridis, N.; Plag, R.; Popp, U.; Rastrepina, G.; Reifarth, R.; Riese, B.; Rigollet, C.; Scheidenberger, C.; Simon, H.; Sonnabend, K.; Steck, M.; Stöhlker, Thomas; Szücs, T.; Sümmerer, K.; Weber, G.; Weick, H.; Winters, D.; Winters, N.; Woods, P. J.; Zhong, Q. P.

doi:10.1103/physrevc.92.035803

Cited by 55 publications

(26 citation statements)

References 34 publications

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“…[238,239]). Recently, for charged-particle induced reactions, the combination of a storage ring and windowless hydrogen micro-droplet target has been successfully applied recently at the Experimental Storage Ring (ESR), GSI [240]. The use of a storage ring enables an efficient use of the rare isotopes, and provides the highest possible luminosity of the rare-isotope beam.…”

Section: Approaches For Direct Measurements Of Neutron-induced Reactimentioning

confidence: 99%

Novel techniques for constraining neutron-capture rates relevant for r-process heavy-element nucleosynthesis

Larsen

Spyrou

Liddick

et al. 2019

Progress in Particle and Nuclear Physics

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The rapid-neutron capture process (r process) is identified as the producer of about 50% of elements heavier than iron.This process requires an astrophysical environment with an extremely high neutron flux over a short amount of time (∼ seconds), creating very neutron-rich nuclei that are subsequently transformed to stable nuclei via β − decay. In 2017, one site for the r process was confirmed: the advanced LIGO and advanced Virgo detectors observed two neutron stars merging, and immediate follow-up measurements of the electromagnetic transients demonstrated an "afterglow" over a broad range of frequencies fully consistent with the expected signal of an r process taking place. Although neutronstar mergers are now known to be r-process element factories, contributions from other sites are still possible, and a comprehensive understanding and description of the r process is still lacking. One key ingredient to large-scale r-process reaction networks is radiative neutron-capture (n, γ) rates, for which there exist virtually no data for extremely neutronrich nuclei involved in the r process. Due to the current status of nuclear-reaction theory and our poor understanding of basic nuclear properties such as level densities and average γ-decay strengths, theoretically estimated (n, γ) rates may vary by orders of magnitude and represent a major source of uncertainty in any nuclear-reaction network calculation of rprocess abundances. In this review, we discuss new approaches to provide information on neutron-capture cross sections and reaction rates relevant to the r process. In particular, we focus on indirect, experimental techniques to measure radiative neutron-capture rates. While direct measurements are not available at present, but could possibly be realized in the future, the indirect approaches present a first step towards constraining neutron-capture rates of importance to the r process.

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Section: Approaches For Direct Measurements Of Neutron-induced Reactimentioning

confidence: 99%

Novel techniques for constraining neutron-capture rates relevant for r-process heavy-element nucleosynthesis

Larsen

Spyrou

Liddick

et al. 2019

Progress in Particle and Nuclear Physics

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“…Proton induced reaction studies on unstable nuclei are important and are being addressed also with new techniques [21]. Neutron induced reaction studies are difficult on stable, very difficult on unstable nuclei [5].…”

Section: Discussionmentioning

confidence: 99%

Nuclear astrophysics at FRANZ

Reifarth

Dababneh

Fiebiger

et al. 2018

J. Phys.: Conf. Ser.

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Abstract. The neutron capture cross section of radioactive isotopes for neutron energies in the keV region will be measured by a time-of-flight (TOF) experiment. NAUTILUS will provide a unique facility realizing the TOF technique with an ultra-short flight path at the FRANZ setup at Goethe-University Frankfurt am Main, Germany. A highly optimized spherical photon calorimeter will be built and installed at an ultra-short flight path. This new method allows the measurement of neutron capture cross sections on extremely small sample as needed in the case of 85 Kr, which will be produced as an isotopically pure radioactive sample. The successful measurement will provide insights into the dynamics of the late stages of stars, an important independent check of the evolution of the Universe and the proof of principle.

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“…Its half-life is long enough to be stored easily for some time in the ring for preparation of the beam and carrying out the measurement. A dense liquid hydrogen target (≈10 14 particles/cm 2 ) is used for the reaction surrounded by X-ray detectors for normalization of the cross section [2]. A standard double-sided silicon strip detector is placed into the ultra high vacuum of the storage ring in the dipole for detection of the reaction residuals, which move on a different trajectory than the unreacted beam.…”

Section: Kinematics and Ion-optics Calculationsmentioning

confidence: 99%

“…The success of this method using the existing ESR storage ring at GSI [1] has been shown in [2] and in a recent experiment employing the 124 Xe(p, γ) reaction [3]. Both reactions belong to the astrophysical γ-process and the measurements allow to constrain input parameters for Hauser-Feshbach rate calculations.…”

Section: Introductionmentioning

confidence: 99%

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Constraining astrophysical reaction rates: using the storage rings at FAIR/GSI

et al. 2017

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Abstract. Ion optical calculations for a storage ring at the present GSI facility for direct proton-induced reactions relevant for different astrophysical processes are presented. As an example case, the 59 Cu(p, γ) and 59 Cu(p, α) reactions are shown. The branching of these two reactions is important in X-ray burst scenarios, since it determines the breakout out of the major 56 Ni waiting point.

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First measurement of theRu96(p,γ)Rh97cross se

Cited by 55 publications

References 34 publications

Novel techniques for constraining neutron-capture rates relevant for r-process heavy-element nucleosynthesis

Novel techniques for constraining neutron-capture rates relevant for r-process heavy-element nucleosynthesis

Nuclear astrophysics at FRANZ

Constraining astrophysical reaction rates: using the storage rings at FAIR/GSI

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