Present and Future Experiments with Stored Exotic Nuclei at Relativistic Energies

Geißel, H.; Litvinov, Yu. A.; Pfeiffer, B.; Attallah, F.; Audi, G.; Beckert, K.; Béller, P.; Bosch, F.; Boutin, D.; Bürvenich, T.; Chen, L.; Falch, M.; Franzke, B.; Hausmann, M.; Kaza, E.; Kerscher, Th.; Kienle, Paul; Klepper, O.; Knöbel, R.; Kozhuharov, C.; Kratz, K.L.; Litvinov, S.; Löbner, K. E. G.; Maier, L.; Montes, F.; Münzenberg, G.; Nociforo, C.; Nolden, F.; Novikov, Yu. N.; Ohtsubo, T.; Ostrowski, A. N.; Patyk, Z.; Plaß, W. R.; Portillo, M.; Radon, T.; Schatz, H.; Scheidenberger, C.; Stadlmann, J.; Steck, M.; Sun, Bingbing; Takahashi, Kohji; Vorobjev, G.; Weick, H.; Winkler, M.; Wöllnik, H.; Yamaguchi, Takayuki

doi:10.1063/1.2200908

Cited by 19 publications

(6 citation statements)

References 6 publications

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“…This is one of several isotopes that were discovered in the ESR. Data are from [162,191,280] Probing the peculiarities found in the EC decay of fewelectron ions will be a primary focus in the near future. The dependence of EC decay rates of H-like atoms on the total angular momentum, the g.s.…”

Section: Discussionmentioning

confidence: 99%

Beta decay of highly charged ions

2010

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Beta decay of highly charged ions has attracted much attention in recent years. An obvious motivation for this research is that stellar nucleosynthesis proceeds at high temperatures where the involved atoms are highly ionized. Another important reason is addressing decays of well-defined quantum-mechanical systems, such as one-electron ions where all interactions with other electrons are excluded. The largest modifications of nuclear half-lives with respect to neutral atoms have been observed in beta decay of highly charged ions. These studies can be performed solely at ion storage rings and ion traps, because there high atomic charge states can be preserved for extended periods of time (up to several hours). Currently, all experimental results available in this field originate from experiments at the heavy-ion complex GSI in Darmstadt. There, the fragment separator facility FRS allows the production and separation of exotic, highly charged nuclides, which can then be stored and investigated in the storage ring facility ESR. In this review, we present and discuss in particular two-body beta decays, namely bound-state beta decay and orbital electron capture. Although we focus on experiments conducted at GSI, we will also attempt to provide general requirements common to any other experiment in this context. Finally, we address challenging but not yet performed experiments and we give prospects for the new radioactive beam facilities, such as FAIR in Darmstadt, IMP in Lanzhou and RIKEN in Wako.

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Section: Discussionmentioning

confidence: 99%

Beta decay of highly charged ions

2010

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“…The curves for other m/q were scaled assuming that the particles with the same Bρ have the same orbit length in the ESR. The grey region illustrates the range of magnetic rigidities determined in the FRS in the so-called Bρ-tagging method [127]. Right: examples of measured revolution-time spectra in the ESR with and without applying the Bρ-tagging method.…”

Section: Schottky Spectrometry In the Isochronously Tuned Storage Ringmentioning

confidence: 99%

“…Taken from Ref. [127] Right: The half-life of 235 Ac 88+ ions can be extracted from the time evolution of the peak-area. Taken from Ref.…”

Section: Pbmentioning

confidence: 99%

Storage ring mass spectrometry for nuclear structure and astrophysics research

et al. 2016

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In the last two and a half decades ion storage rings have proven to be powerful tools for precision experiments with unstable nuclides in realm of nuclear structure and astrophysics. There are presently three storage ring facilities in the world at which experiments with stored radioactive ions are possible. These are the ESR in GSI, Darmstadt/Germany, the CSRe in IMP, Lanzhou/China, and the R3 storage ring in RIKEN, Saitama/Japan. In this work, an introduction to the facilities is given. Selected characteristic experimental results and their impact in nuclear physics and astrophysics are presented. Planned technical developments and the envisioned future experiments are outlined.

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“…* large number of reliable reference masses in the same spectrum * coverage of a wide area on the mass surface * appearance of the same nuclides in different ionic charge states * high resolving power of about 10 6 * tracing the stored fragments down to single ions. * including the information of nuclear formation cross sections and decay properties Recently, new neutron-rich isotopes have been discovered in SMS experiments (Geissel et al, 2006b). The discovery of new isotopes along with the first mass and life time measurement is certainly a clear demonstration of the power of time-resolved SMS.…”

Section: Measurementsmentioning

confidence: 99%

Mass and lifetime measurements of exotic nuclei in storage rings

Franzke

Geißel

Münzenberg

2008

Mass Spectrometry Reviews

222

189

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Mass and lifetime measurements lead to the discovery and understanding of basic properties of matter. The isotopic nature of the chemical elements, nuclear binding, and the location and strength of nuclear shells are the most outstanding examples leading to the development of the first nuclear models. More recent are the discoveries of new structures of nuclides far from the valley of stability. A new generation of direct mass measurements which allows the exploration of extended areas of the nuclear mass surface with high accuracy has been opened up with the combination of the Experimental Storage Ring ESR and the FRragment Separator FRS at GSI Darmstadt. In-flight separated nuclei are stored in the ring. Their masses are directly determined from the revolution frequency. Dependent on the half-life two complementary methods are applied. Schottky Mass Spectrometry SMS relies on the measurement of the revolution frequency of electron cooled stored ions. The cooling time determines the lower half-life limit to the order of seconds. For Isochronous Mass Spectrometry IMS the ring is operated in an isochronous ion-optical mode. The revolution frequency of the individual ions coasting in the ring is measured using a time-of-flight method. Nuclides with lifetimes down to microseconds become accessible. With SMS masses of several hundreds nuclides have been measured simultaneously with an accuracy in the 2 x 10(-7)-range. This high accuracy and the ability to study large areas of the mass surface are ideal tools to discover new nuclear structure properties and to guide improvements for theoretical mass models. In addition, nuclear half-lives of stored bare and highly charged ions have been measured. This new experimental development is a significant progress since nuclear decay characteristics are mostly known for neutral atoms. For bare and highly charged ions new nuclear decay modes become possible, such as bound-state beta decay. Dramatic changes in the nuclear lifetime have been observed in highly charged ions compared to neutral atoms due to blocking of nuclear decay channels caused by the modified atomic interaction. High ionization degrees prevail in hot stellar matter and thus these experiments have great relevance for the understanding of the synthesis of elements in the universe and astrophysical scenarios in general.

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Present and Future Experiments with Stored Exotic Nuclei at Relativistic Energies

Cited by 19 publications

References 6 publications

Beta decay of highly charged ions

Beta decay of highly charged ions

Storage ring mass spectrometry for nuclear structure and astrophysics research

Mass and lifetime measurements of exotic nuclei in storage rings

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