Nuclear reaction studies on unstable isotopes can strongly help in improving our understanding of nucleosynthesis in stars.Indirect approaches to determining astrophysical reaction rates are increasingly common-place ...Nuclear reaction studies on unstable isotopes can strongly help in improving our understanding of nucleosynthesis in stars.Indirect approaches to determining astrophysical reaction rates are increasingly common-place and undergoing continuous refinement.Of particular interest is the use of such indirect techniques at storage rings,which,among other aspects,allow to recycle rare unstable beams.We propose to investigate the reaction rates of astrophysical interest using indirect methods(surrogate,Trojan horse,etc.)in reverse kinematics at the IMP-CAS storage ring.Long lived radioactive ion beams,produced remotely,can be accelerated,and made to interact with light targets.The proposed reactions are^(85)Kr(p,p’γ),^(85)Kr(d,pγ),constraining the neutron flux in an s-process branching point,^(79)Se(p,p’γ),^(79)Se(d,pγ),constraining the temperature in s-process nucleosyntheses,and^(59)Fe(d,pγ),constraining core collapse supernovae.展开更多
The measurement of the bound-state decay of^(205)Tl at the Experimental Storage Ring(ESR)at GSI,Darmstadt,has recently been reported,with substantial impact on the use of^(205)Pb as an early Solar System chronometer a...The measurement of the bound-state decay of^(205)Tl at the Experimental Storage Ring(ESR)at GSI,Darmstadt,has recently been reported,with substantial impact on the use of^(205)Pb as an early Solar System chronometer and on the low-energy measurement of the solar neutrino spectrum via the LOREX project.Owing to the technical challenges in producing a high-purity^(205)T^(l81+)secondary beam,a robust statistical method was developed to estimate the variation in the contaminant^(205)Pb^(81+)produced in the fragmentation reaction,which was subsequently transmitted and stored in the ESR.Here,we show that Bayesian and Monte Carlo methods produce comparable estimates for the contaminant variation,each with unique advantages and challenges given the complex statistical problems for this experiment.We recommend the adoption of such methods in future experiments that exhibit unknown statistical fluctuations.展开更多
The application of software defined radio in on-line interactions with the beam processes of the heavy ion storage ring is presented.We discusse how this new technique can enhance the beam time efficiency and create n...The application of software defined radio in on-line interactions with the beam processes of the heavy ion storage ring is presented.We discusse how this new technique can enhance the beam time efficiency and create new measurement possibilities.A specific example to halt the accelerator running if a rare stored particle is identified on-line is discussed.展开更多
Non-destructive Schottky detectors are indispensable devices widely used in experiments at heavy-ion storage rings.In particular,they can be used to accurately determine the masses and lifetimes of short-lived exotic ...Non-destructive Schottky detectors are indispensable devices widely used in experiments at heavy-ion storage rings.In particular,they can be used to accurately determine the masses and lifetimes of short-lived exotic nuclear species.Single-ion sensitivity-which is the highest level of sensitivity-has been regularly achieved in the past by utilizing resonant cavity detectors.Recent designs and analysis methods aim to push the limits of measurement accuracy by increasing the dimensionality of the acquired data,namely,the position of the particle as well as the phase difference between several detectors.This paper describes current methods and future perspectives for Schottky detection techniques,with a focus on their application to mass and lifetime measurements of the most rare and simultaneously short-lived radio nuclides.展开更多
文摘Nuclear reaction studies on unstable isotopes can strongly help in improving our understanding of nucleosynthesis in stars.Indirect approaches to determining astrophysical reaction rates are increasingly common-place and undergoing continuous refinement.Of particular interest is the use of such indirect techniques at storage rings,which,among other aspects,allow to recycle rare unstable beams.We propose to investigate the reaction rates of astrophysical interest using indirect methods(surrogate,Trojan horse,etc.)in reverse kinematics at the IMP-CAS storage ring.Long lived radioactive ion beams,produced remotely,can be accelerated,and made to interact with light targets.The proposed reactions are^(85)Kr(p,p’γ),^(85)Kr(d,pγ),constraining the neutron flux in an s-process branching point,^(79)Se(p,p’γ),^(79)Se(d,pγ),constraining the temperature in s-process nucleosyntheses,and^(59)Fe(d,pγ),constraining core collapse supernovae.
基金funding from the European Research Council(ERC)under the European Union's Horizon 2020 research and innovation programme(Grant Agreement No.682841"ASTRUm"and No.654002"ENSAR2")The research of G.Leckenby,I.Dillmann,and C.Griffin was funded by the Canadian Natural Sciences and Engineering Research Council(NSERC)via the grant SAPIN-2019-00030+1 种基金J.Glorius,M.S.Sanjari,Yu.A.Litvinov and C.Brandau acknowledge support by the State of Hesse within the Research Cluster ELEMENTS(Project ID 500/10.006)E.Menz and Yu.A.Litvinov acknowledge support by the project"NRW-FAIR",a part of the programme"Netzwerke 2021",an initiative of the Ministry of Culture and Science of the State of North Rhine-Westphalia.R.Gernhäuser acknowledges support by the Excellence Cluster ORIGINS from the German Research Foundation DFG(Excellence Strategy EXC-2094-390783311)。
文摘The measurement of the bound-state decay of^(205)Tl at the Experimental Storage Ring(ESR)at GSI,Darmstadt,has recently been reported,with substantial impact on the use of^(205)Pb as an early Solar System chronometer and on the low-energy measurement of the solar neutrino spectrum via the LOREX project.Owing to the technical challenges in producing a high-purity^(205)T^(l81+)secondary beam,a robust statistical method was developed to estimate the variation in the contaminant^(205)Pb^(81+)produced in the fragmentation reaction,which was subsequently transmitted and stored in the ESR.Here,we show that Bayesian and Monte Carlo methods produce comparable estimates for the contaminant variation,each with unique advantages and challenges given the complex statistical problems for this experiment.We recommend the adoption of such methods in future experiments that exhibit unknown statistical fluctuations.
基金support by the State of Hesse within the Research Cluster ELEMENTS (Project ID 500/10.006)support by the project "NRW-FAIR"a part of the programme "Netzwerke 2021".
文摘The application of software defined radio in on-line interactions with the beam processes of the heavy ion storage ring is presented.We discusse how this new technique can enhance the beam time efficiency and create new measurement possibilities.A specific example to halt the accelerator running if a rare stored particle is identified on-line is discussed.
基金support by the State of Hesse within the Research Cluster ELEMENTS (Project ID 500/10.006)support by the project "NRW-FAIR"+1 种基金a part of the programme "Netzwerke 2021"an initiative of the Ministry of Culture and Science of the State of North Rhine-Westphalia。
文摘Non-destructive Schottky detectors are indispensable devices widely used in experiments at heavy-ion storage rings.In particular,they can be used to accurately determine the masses and lifetimes of short-lived exotic nuclear species.Single-ion sensitivity-which is the highest level of sensitivity-has been regularly achieved in the past by utilizing resonant cavity detectors.Recent designs and analysis methods aim to push the limits of measurement accuracy by increasing the dimensionality of the acquired data,namely,the position of the particle as well as the phase difference between several detectors.This paper describes current methods and future perspectives for Schottky detection techniques,with a focus on their application to mass and lifetime measurements of the most rare and simultaneously short-lived radio nuclides.
