Mass measurement of cooled neutron-deficient bismuth projectile fragments with time-resolved Schottky mass spectrometry at the FRS-ESR facility

Litvinov, Yu. A.; Geißel, H.; Radon, T.; Attallah, F.; Audi, G.; Beckert, K.; Bosch, F.; Falch, M.; Franzke, B.; Hausmann, M.; Hellström, M.; Kerscher, Th.; Klepper, O.; Kluge, H.-J.; Kozhuharov, C.; Löbner, K. E. G.; Münzenberg, G.; Nolden, F.; Novikov, Yu. N.; Quint, W.; Patyk, Z.; Reich, H.; Scheidenberger, C.; Sick, Bernhard; Steck, M.; Sümmerer, K.; Vermeeren, L.; Winkler, M.; Winkler, T.; Wöllnik, H.

doi:10.1016/j.nuclphysa.2005.03.015

Cited by 587 publications

(46 citation statements)

References 39 publications

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“…The Fourier transform of the signal from the pickup yields a noise-power density spectrum, or "Schottky frequency spectrum." In this experiment the 30th harmonic revolution frequency was analyzed [15,34]. The choice of the harmonic number is defined by the resonant circuit system which can be operated at 30 or 60 MHz [35].…”

Section: Methodsmentioning

confidence: 99%

“…To avoid complications of beam crystalization [15] and poor frequency resolution, the techniques discussed in Ref. [50] have been used for all low-energy (<500 keV) isomers.…”

Section: F 186 Tamentioning

confidence: 99%

“…Nevertheless, with the experimental storage ring (ESR) it is now feasible to directly observe an isomer without necessarily detecting its decay [14]. The ESR enables observation of single ions, allowing measurements to be performed despite very low production cross sections [15], with the ability to measure excitation energies of states with half-lives greater than 1 s. This experimental technique can thus be used to complement the well established γ -ray methods.…”

Section: Introductionmentioning

confidence: 99%

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Long-lived isomers in neutron-richZ=72–76 nuclides

et al. 2012

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A study of neutron-rich isotopes in the A = 185 region of the nuclear chart has uncovered long-lived (>1 s) isomers in several isotopes of hafnium, tantalum, tungsten, rhenium, and osmium. The region was accessed via the use of projectile fragmentation with the UNILAC-SIS accelerators at GSI. Fragmentation products of 197 Au were passed through the fragment separator (FRS) and injected into the experimental storage ring (ESR), where single-ion identifications could be made. Evidence is presented for isomers in 183,184,186 Hf, 186,187 Ta, 186 W, 190,192,194 Re, and 195 Os with excitation energies in the range of 0.1-3.0 MeV. The lightest of these nuclides have well deformed prolate shapes, while the heaviest are transitional and susceptible to shape changes. Their properties are interpreted with the help of multi-quasiparticle and potential-energy-surface calculations.

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Section: Methodsmentioning

confidence: 99%

“…To avoid complications of beam crystalization [15] and poor frequency resolution, the techniques discussed in Ref. [50] have been used for all low-energy (<500 keV) isomers.…”

Section: F 186 Tamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Long-lived isomers in neutron-richZ=72–76 nuclides

et al. 2012

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“…In order to determine the unknown mass-over-charge ratios, the Schottky frequency spectra have to be calibrated [19,24]. For this purpose we selected the nuclides which were identified in our spectra and for which masses are known experimentally according to the Atomic-Mass Evaluation 2003 (AME) [28].…”

Section: Data Analysis and Resultsmentioning

confidence: 99%

“…The pick-up signal was down-mixed using a ∼60 MHz reference frequency from an external frequency generator. The acceptance of the ESR at the 30 th harmonic corresponds to about 320 kHz [23,24]. Therefore, to cover the entire ESR acceptance we digitized the signal with a sampling frequency of 640 kHz using a commercial 16-bit ADC [25].…”

Section: Methodsmentioning

confidence: 99%

Schottky mass measurements of heavy neutron-rich nuclides in the element range70≤Z≤79at the GSI Experimental Storage Ring

Shubina¹,

Cakirli²,

Litvinov³

et al. 2013

Phys. Rev. C

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Storage-ring mass spectrometry was applied to neutron-rich 197 Au projectile fragments. Masses of 181,183 Lu, 185,186 Hf, 187,188 Ta, 191 W, and 192,193 Re nuclei were measured for the first time. The uncertainty of previously known masses of 189,190 W and 195 Os nuclei was improved. Observed irregularities on the smooth two-neutron separation energies for Hf and W isotopes are linked to the collectivity phenomena in the corresponding nuclei.

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Current literature in mass spectrometry

2006

J. Mass Spectrom.

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In order to keep subscribers up‐to‐date with the latest developments in their field, John Wiley & Sons are providing a current awareness service in each issue of the journal. The bibliography contains newly published material in the field of mass spectrometry. Each bibliography is divided into 11 sections: 1 Books, Reviews & Symposia; 2 Instrumental Techniques & Methods; 3 Gas Phase Ion Chemistry; 4 Biology/Biochemistry: Amino Acids, Peptides & Proteins; Carbohydrates; Lipids; Nucleic Acids; 5 Pharmacology/Toxicology; 6 Natural Products; 7 Analysis of Organic Compounds; 8 Analysis of Inorganics/Organometallics; 9 Surface Analysis; 10 Environmental Analysis; 11 Elemental Analysis. Within each section, articles are listed in alphabetical order with respect to author (4 Weeks journals ‐ Search completed at 15th. Mar. 2006)

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Mass measurement of cooled neutron-deficient bismuth projectile fragments with time-resolved Schottky mass spectrometry at the FRS-ESR facility

Cited by 587 publications

References 39 publications

Long-lived isomers in neutron-richZ=72–76 nuclides

Long-lived isomers in neutron-richZ=72–76 nuclides

Schottky mass measurements of heavy neutron-rich nuclides in the element range70≤Z≤79at the GSI Experimental Storage Ring

Current literature in mass spectrometry

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