AMS for M &gt; 36 with a gas-filled magnetic spectrograph

Korschinek, G.; Kastel, S.; Knie, K.; Maier, H.; Fernandez-Niello, J.; Rothenberger, Manuel; Zerle, L.

doi:10.1016/0168-583x(94)95995-1

Cited by 19 publications

(8 citation statements)

References 13 publications

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“…reach 93 Zr/ 92 Zr ∼ 6 × 10 −11 (Pavetich et al 2019;Hain et al 2018); this hinges on successful removal of the stable isobar 93 Nb. In the case of 107 Pd, Korschinek et al (1994) report an AMS sensitivity 107 Pd/ 106 Pd ∼ 10 −8 ; here the interfering stable isobar is 107 Ag. In the case of 129 I there is a natural background level 129 I/ 127 I ∼ 1.5 × 10 −12 (Ji et al 2015b).…”

Section: Observables: Searching For Explosion Ejecta On the Earth And...mentioning

confidence: 92%

r-Process Radioisotopes from Near-Earth Supernovae and Kilonovae

Wang,

Clark,

Ellis

et al. 2021

Preprint

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The astrophysical sites where r-process elements are synthesized remain mysterious: it is clear that neutron-star mergers (kilonovae, KNe) contribute, and some classes of core-collapse supernovae (SNe) are also likely sources of at least the lighter r-process species. The discovery of the live isotope 60 Fe on the Earth and Moon implies that one or more astrophysical explosions occurred near the Earth within the last few Myr, probably a SN. Intriguingly, several groups have reported evidence for deposits of 244 Pu, some overlapping with the 60 Fe pulse. However, the putative 244 Pu flux appears to extend to at least 12 Myr ago, pointing to a different origin. Motivated by this observation, we propose that ejecta from a KN enriched the giant molecular cloud that gave rise to the Local Bubble in which the Sun resides. Accelerator Mass Spectrometry (AMS) measurements of 244 Pu and searches for other live isotopes could probe the origins of the r-process and the history of the solar neighborhood, including triggers for mass extinctions, e.g., at the end of the Devonian epoch, motivating the calculations of the abundances of live r-process radioisotopes produced in SNe and KNe that we present here. Given the presence of 244 Pu, other r-process species such as 93 Zr, 107 Pd, 129 I, 135 Cs, 182 Hf, 236 U, 237 Np and 247 Cm should be present. Their abundances could distinguish between SN and KN scenarios, and we discuss prospects for their detection in deep-ocean deposits and the lunar regolith. We show that AMS 129 I measurements in Fe-Mn crusts already constrain a possible nearby KN scenario.

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Section: Observables: Searching For Explosion Ejecta On the Earth And...mentioning

confidence: 92%

r-Process Radioisotopes from Near-Earth Supernovae and Kilonovae

Wang,

Clark,

Ellis

et al. 2021

Preprint

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“…Paul et al (1997), using a 90 Sr energy of 131 MeV, have reported the best sensitivity to date, corresponding to 90 Sr/Sr ∼ 3 × 10 −13 . Korschinek et al (1994) have also reported 90 Sr measurements using a gas-filled magnet.…”

Section: Ni (T 1mentioning

confidence: 99%

Accelerator mass spectrometry and its applications

Fifield

1999

Rep. Prog. Phys.

158

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The state of the art in accelerator mass spectrometry (AMS) is reviewed. The review is divided in two parts. The first covers the general methodology, followed by its specific elaborations for the commonly measured long-lived isotopes such as 10 Be, 14 C, 26 Al, 36 Cl and 129 I, as well as other isotopes with emerging applications. The second part considers the very wide spectrum of applications that now employ AMS, and groups these according to research area rather than isotope. The period up until late 1998 is covered, with an emphasis on post-1990 developments and literature.

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“…Interacting with the gas atoms, the ions get an average magnetic rigidity depending on their nuclear charge. Measurements were done at Argonne National Laboratory with a Split Pole and in Munich (Korschinek et al 1994) with a Q3D-spectrograph. The weak points of these systems are field arrangements, where only 40-50% of the ion paths in the gas-filled regions are covered by magnetic field.…”

Section: Investigations Of the Human Aluminum Biokinetics With 26a1 Amentioning

confidence: 99%

Abstracts of the 7th International AMS Conference

1996

Radiocarbon

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The AMS program at the S. Paulo 9MV Tandem accelerator has been initiated with major emphasis on projects based on the determination of 10Be, 26Al and 36C1 concentrations. A first report on this program was presented at the AMS Conference in Canberra (Tenreiro et al. 1994). Since then, progress has been achieved on the improvement of the voltage stability of the 8UD-9MV terminal and the ionic optics, controlled only by electrostatic elements, except for the analyzing magnet. An automatic system for changing beams of different isotopes has been developed, allowing the rejection of the stable beams before they reach the detector placed at the beam direction. The group from the Fluminense Federal University (UFF), in Niteroi, has helped in the design and construction of a new Bragg gas chamber detector, coupled with an E X DE telescope and a time-of-flight system. A new scattering chamber has also been designed at UFF, and it will be fully dedicated to the AMS program. Beams of 26A1 were produced via the 26Mg (p,n) 26Al reaction; 36C1 beams were produced from samples prepared from sea water from different places in South America and placed at a Cssputtering ion source. Both beams were successfully accelerated and detected. Recently, another group, from the Londrina State University, has joined the Brazilian AMS project. The main research programs related with the AMS technique, in Brazil, are based on Geological and Oceanographical studies. REFERENCE Tenreiro, C. et al. 1994 Nuclear Instruments and Methods in Physics Research B92. AMS SAMPLE HANDLING IN GRONINGENA. T. AERTS-BIJMA, H. MEIJER and J. VAN As is the case with the Groningen conventional laboratory, the AMS laboratory handles ca. 1000 samples annually such as water (DIC/DOC from groundwater and the ocean), marine carbonates, atmospheric C02, organic deposits such as peat, soils and macrofossils, and the complete spectrum of archaeological datable materials.The organic samples are combusted in a CN-analyzer, consisting of a flash combustion/purification unit and on-line mass spectrometer. The CO2 is trapped cryogenically and transferred to the graphitization setup. We employ one 10-fold and one 15-fold graphitization systems (ranging from 3 to 8 Since 1985, more than 5000 samples have been 14C dated with the Utrecht AMS facility. In this paper the present status of preparation, measurement and data analysis is discussed. A routine procedure is followed for samples of at least 0.5 mg carbon. The 14C/12C and the 13C/12C ratio are measured and normalized on those of the NOX standard. The AMS-measured S13C value is used to monitor the measurement and must agree within 1-2 a with that from conventional mass-spectrometry.Contamination in preparation and measurement is corrected for on the basis of the average value observed for the blanks (0.18-0.06 pMC). In routine 14C measurements on (sub)recent materials, the overall precision is ca. 0.4%. Measurements on samples containing <200 µg carbon reveal mass dependence in two respects: 1) the 14C/12C of a blank in...

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AMS for M > 36 with a gas-filled magnetic spectrograph

Cited by 19 publications

References 13 publications

r-Process Radioisotopes from Near-Earth Supernovae and Kilonovae

r-Process Radioisotopes from Near-Earth Supernovae and Kilonovae

Accelerator mass spectrometry and its applications

Abstracts of the 7th International AMS Conference

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