Spectrographie α de ∗223Ra (AcX) et de ses dérivés

Walen, R.J.; Nedovessov, V.; Bastin-Scoffier, G.

doi:10.1016/0029-5582(62)90109-8

Cited by 31 publications

(4 citation statements)

References 7 publications

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“…The ground and isomeric states of 211 Po nuclei have been studied by α spectroscopy (e.g., Refs. [78,80,81]) in the past. In the presented mass measurement, the 211 Po ions traveled 192 isochronous turns in the analyzer of the MR-TOF-MS, resulting in a mass resolving power (FWHM) of 300 000.…”

Section: Po Isotopementioning

confidence: 99%

High-resolution, accurate multiple-reflection time-of-flight mass spectrometry for short-lived, exotic nuclei of a few events in their ground and low-lying isomeric states

Andrés¹,

Hornung²,

Ebert³

et al. 2019

Phys. Rev. C

121

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Mass measurements of fission and projectile fragments, produced via 238 U and 124 Xe primary beams, have been performed with the multiple-reflection time-of-flight mass spectrometer (MR-TOF-MS) of the Fragment Separator (FRS) Ion Catcher with a mass resolving power (FWHM) of up to 410 000 and an uncertainty of down to 6 × 10 −8. The nuclides were produced and separated in flight with the fragment separator FRS at 300 to 1000 MeV/u and thermalized in a cryogenic stopping cell. The data-analysis procedure was developed to determine with highest accuracy the mass values and the corresponding uncertainties for the most challenging conditions: down to a few events in a spectrum and overlapping distributions, which can be distinguished from a single peak only by a broader peak shape. With this procedure, the resolution of low-lying isomers is increased by a factor of up to 3 compared to standard data analysis. The ground-state masses of 31 short-lived nuclides of 15 different elements with half-lives of down to 17.9 ms and count rates as low as 11 events per nuclide were determined. This is the first direct mass measurement for seven nuclides. The excitation energies and the isomer-to-groundstate ratios of six isomeric states with excitation energies of as little as 280 keV were measured. For nuclides with known mass values, the average relative deviation from the literature values is (4.5 ± 5.3) × 10 −8. The measured two-neutron separation energies and their slopes near and at the N = 126 and Z = 82 shell closures indicate a strong element-dependent binding energy of the first neutron above the closed proton shell Z = 82. The experimental results deviate strongly from the theoretical predictions, especially for N = 126 and N = 127.

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Section: Po Isotopementioning

confidence: 99%

High-resolution, accurate multiple-reflection time-of-flight mass spectrometry for short-lived, exotic nuclei of a few events in their ground and low-lying isomeric states

Andrés¹,

Hornung²,

Ebert³

et al. 2019

Phys. Rev. C

121

View full text Add to dashboard Cite

show abstract

“…The ground and isomeric states of 211 Po nuclei have been studied by α-spectroscopy (eg., [77,79,80]) in the past. In our mass measurement, the 211 Po ions traveled 192 isochronous turns in the analyzer of the MR-TOF-MS, resulting in a mass resolving power of 300,000.…”

Section: Po Isotopementioning

confidence: 99%

High-resolution, accurate MR-TOF-MS for short-lived, exotic nuclei of few events in their ground and low-lying isomeric states

Ayet,

Hornung,

Ebert

et al. 2019

Preprint

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Mass measurements of fission and projectile fragments, produced via 238 U and 124 Xe primary beams, have been performed with the multiple-reflection time-of-flight mass spectrometer (MR-TOF-MS) of the FRS Ion Catcher with a mass resolving powers (FWHM) up to 410,000 and an uncertainty of 6 • 10 −8 . The nuclides were produced and separated in-flight with the fragment separator FRS at 300 to 1000 MeV/u and thermalized in a cryogenic stopping cell. The dataanalysis procedure was developed to determine with highest accuracy the mass values and the corresponding uncertainties for the most challenging conditions: down to a few events in a spectrum and overlapping distributions, characterized only by a broader common peak shape. With this procedure, the resolution of low-lying isomers is increased by a factor of up to three compared to standard data analysis. The ground-state masses of 31 short-lived nuclides of 15 different elements with half-lives down to 17.9 ms and count rates as low as 11 events per nuclide were determined. This is the first direct mass measurement for seven nuclides. The excitation energies and the isomerto-ground state ratios of six isomeric states with excitation energies down to about 280 keV were measured. For nuclides with known mass values, the average relative deviation from the literature values is (2.9 ± 6.2) • 10 −8 . The measured two-neutron separation energies and their slopes near and at the N=126 and Z=82 shell closures indicate a strong element-dependent binding energy of the first neutron above the closed proton shell Z=82. The experimental results deviate strongly from the theoretical predictions, especially for N=126 and N=127.

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“…One loss over recent years has been the decline in maintenance of dedicated magnetic spectrometers that offer extremely good energy resolution. Precise, well-defined studies of α spectra were feasible with homogeneous-field magnetic spectrographs [15,16]. Silicon-based ionization detectors such as the silicon barrier detector (SBD) and passivated implanted planar silicon (PIPS) detector are now much more commonly used to measure the energies and emission probabilities of α particles [17].…”

Section: α-Spectroscopymentioning

confidence: 99%

“…Excitation functions for the four most commonly used shortlived positron emitters in PET studies have been recently evaluated and well quantified ( 11 C, 13 N, 15 O and 18 F [107]). Noteworthy decay data needs are as follows: 57 Ni, 66 Ga, 72 As, 73 Se, 75 Br, 76 Br, 77 Kr, 81 Rb, 82m Rb, 83 Sr, 86 Y, 89 Zr, 94m Tc, 120 I and 121 I: decay-data measurements and evaluations are required; 44 Ti/ 44 Sc, 52 Fe/ 52m Mn, 62 Zn/ 62 Cu, 72 Se/ 72 As and 140 Nd/ 140 Pr generators: decay-data measurements and evaluations are required.…”

Section: Positron Emittersmentioning

confidence: 99%

Radioactive decay data: powerful aids in medical diagnosis and therapy, analytical science and other applications

Nichols

2012

Radiochimica Acta

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Summary. Decay data are commonly used to characterise and quantify radioactive material, and provide an important means of understanding the properties and structure of the nucleus. Experimental measurement techniques are reviewed, with the emphasis placed on recent developments that represent a potential quantum leap in advancing our knowledge, particularly by means of γ -ray spectroscopy. A select number of internationally-accepted decay-data evaluations and compilations are also discussed in terms of their contents. Both energy and non-energy related applications require the input of well-defined decay data, and such activities have been reviewed. Various important decay-data issues are assessed, and note taken of any significant requirements for better quantified data.

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Spectrographie α de ∗223Ra (AcX) et de ses dérivés

Cited by 31 publications

References 7 publications

High-resolution, accurate multiple-reflection time-of-flight mass spectrometry for short-lived, exotic nuclei of a few events in their ground and low-lying isomeric states

High-resolution, accurate multiple-reflection time-of-flight mass spectrometry for short-lived, exotic nuclei of a few events in their ground and low-lying isomeric states

High-resolution, accurate MR-TOF-MS for short-lived, exotic nuclei of few events in their ground and low-lying isomeric states

Radioactive decay data: powerful aids in medical diagnosis and therapy, analytical science and other applications

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