Half-Life Measurements of Bare, Mass-Resolved Isomers in a Storage-Cooler Ring

Irnich, H.; Geißel, H.; Nolden, F.; Beckert, K.; Bosch, F.; Eickhoff, H.; Franzke, B.; Fujita, Y.; Hausmann, M.; Jung, H.; Klepper, O.; Kozhuharov, C.; Kraus, G.; Magel, A.; Münzenberg, G.; Nickel, F.; Radon, T.; Reich, H.; Sick, Bernhard; Schwab, W.; Steck, M.; Sümmerer, K.; Suzuki, Toshio; Wöllnik, H.

doi:10.1103/physrevlett.75.4182

Cited by 96 publications

(47 citation statements)

References 10 publications

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“…The measured γ-ray intensities [19] of these transitions were used in-conjunction with the neutral lifetime and conversion coefficients to gauge the hindrance due to [22][23][24], this present measurements is the first storage-ring measurement of the decay of an hydrogen-like isomer. Previously, there have been only measurements of isomers in fully ionised states [25,26]. In the present case of 192 Os, the neutral lifetime measurement has been observed to be 8.5 (14) s [16], whereas, our measurement of 15.1 +1.5 −1.3 s for hydrogenlike ions is in stark contrast.…”

Section: The Lifetime Of the Highly-ionisedcontrasting

confidence: 53%

Increased isomeric lifetime of hydrogen-likeOs192m

Akber¹,

Reed²,

Walker³

et al. 2015

Phys. Rev. C

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Section: The Lifetime Of the Highly-ionisedcontrasting

confidence: 53%

Increased isomeric lifetime of hydrogen-likeOs192m

Akber¹,

Reed²,

Walker³

et al. 2015

Phys. Rev. C

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“…Experiments of such a kind have routinely been conducted in the ESR at GSI, Germany for decades [21][22][23][24][25]. With the intensity-sensitive and time-resolving Schottky resonator recently installed in the ESR [26], decays of exotic ions can be investigated on a single-ion basis [27,28].…”

Section: Discussionmentioning

confidence: 99%

Statistical approaches to lifetime measurements with restricted observation times

et al. 2017

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Two generic methods based on frequentism and Bayesianism are presented in this work aiming to adequately estimate decay lifetimes from measured data, while accounting for restricted observation times in the measurements. All the experimental scenarios that can possibly arise from the observation constraints are treated systematically and formulas are derived. The methods are then tested against the decay data of bare isomeric 94m Ru 44+ , which were measured using isochronous mass spectrometry with a timing detector at the CSRe in Lanzhou, China. Applying both methods in three distinct scenarios yields six different but consistent lifetime estimates. The deduced values are all in good agreement with a prediction based on the neutral-atom value modified to take the absence of internal conversion into account. Potential applications of such methods are discussed.

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“…Stored exotic nuclei circulating in the ESR offer unique perspectives for decay spectroscopy [15,16]. The half-life of the stored nuclei can be measured by detecting the mother and daughter nuclides using the difference of their magnetic rigidity (Bρ).…”

Section: Resultsmentioning

confidence: 99%

Present and Future Experiments with Stored Exotic Nuclei at Relativistic Energies

Geißel

Litvinov

Pfeiffer³

et al. 2006

AIP Conference Proceedings

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Abstract. Recent progress is presented from experiments on masses and lifetimes of bare and fewelectron exotic nuclei at GSI. Relativistic rare isotopes produced via projectile fragmentation and fission were separated in flight by the fragment separator FRS and injected into the storage ring ESR. This worldwide unique experimental technique gives access to all fragments with half-lives down to the microsecond range. The great research potential is also demonstrated by the discovery of new isotopes along with simultaneous measurements of mass and lifetime. Representative results from time-resolved Schottky mass spectrometry are compared with modern theoretical predictions. The measured isospin dependence of pairing-gap energies is not reproduced by conventional mass models. The first direct observation of bound-state beta decay has been achieved. Single particle decay measurements and the continuous recording of both stored mother and daughter nuclei open up a new era for spectroscopy. The combination of stochastic and electron cooling has allowed us to measure with Schottky analysis for the first time short-lived isomers. The future international NUSTAR facility at FAIR consisting of a new large-acceptance in-flight separator (Super-FRS) will be an ideal tool to study the r-and rp-process nuclei.

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Half-Life Measurements of Bare, Mass-Resolved Isomers in a Storage-Cooler Ring

Cited by 96 publications

References 10 publications

Increased isomeric lifetime of hydrogen-likeOs192m

Increased isomeric lifetime of hydrogen-likeOs192m

Statistical approaches to lifetime measurements with restricted observation times

Present and Future Experiments with Stored Exotic Nuclei at Relativistic Energies

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