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

Andrés, Samuel Ayet San; Hornung, C.; Ebert, Jens; Plaß, W. R.; Dickel, T.; Geißel, H.; Scheidenberger, C.; Bergmann, J.; Greiner, Florian; Haettner, E.; Jesch, C.; Lippert, W.; Mardor, I.; Miskun, Ivan; Patyk, Z.; Piétri, S.; Pihktelev, Alexander; Purushothaman, S.; Reiter, M. P.; Rink, Ann-Kathrin; Weick, H.; Yavor, M.I.; Bagchi, S.; Charviakova, Volha; Constantin, P.; Diwisch, M.; Finlay, A.; Kaur, Satbir; Knöbel, R.; Lang, Johannes; Mei, B.; Moore, I. D.; Otto, Jan-Hendrik; Pohjalainen, I.; Procházka, A.; Rappold, C.; Takechi, M.; Tanaka, Y. K.; Winfield, J. S.; Xu, X.

doi:10.1103/physrevc.99.064313

Cited by 47 publications

(128 citation statements)

References 71 publications

(105 reference statements)

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“…Direct mass measurements of several short-lived nuclides with half-lives down to 2 ms, with production cross sections down to the microbarn-level, at rates down to a few ions per hour, and for as few as 11 detected ions per species have been performed with the MR-TOF-MS [9][10][11][12][13][14]. Mass resolving powers of up to 410,000 have been achieved, the highest resolving power obtained hitherto online with an MR-TOF-MS.…”

Section: Recent Results and Instrumental Upgradesmentioning

confidence: 99%

The science case of the FRS Ion Catcher for FAIR Phase-0

et al. 2019

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The FRS Ion Catcher at GSI enables precision experiments with thermalized projectile and fission fragments. At the same time it serves as a test facility for the Low-Energy Branch of the Super-FRS at FAIR. The FRS Ion Catcher has been commissioned and its performance has been characterized in five experiments with 238 U and 124 Xe projectile and fission fragments produced at energies in the range from 300 to 1000 MeV/u. High and almost element-independent efficiencies for the thermalization of short-lived nuclides produced at relativistic energies have been obtained. High-accuracy mass measurements of more than 30 projectile and fission fragments have been performed with a multiple-reflection time-offlight mass spectrometer (MR-TOF-MS) at mass resolving powers of up to 410,000, with production cross sections down to the microbarn-level, and at rates down to a few ions per hour. The versatility of the MR-TOF-MS for isomer research has been demonstrated by the measurement of various isomers, determination of excitation energies and the production of a pure isomeric beam. Recently, several instrumental upgrades have been implemented at the FRS Ion Catcher. New experiments will be carried out during FAIR Phase-0 at GSI, including direct mass measurements of neutron-deficient nuclides below 100 Sn and neutronrich nuclides below 208 Pb, measurement of β-delayed neutron emission probabilities and reaction studies with multi-nucleon transfer.

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Section: Recent Results and Instrumental Upgradesmentioning

confidence: 99%

The science case of the FRS Ion Catcher for FAIR Phase-0

et al. 2019

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“…The parameter c was determined for each mass unit from an isobaric reference ion of well-known mass that arrived with the radioactive beam from the ISAC target. A time-dependent calibration [25,26] was applied to each spectrum to correct for temperature drifts and power-supply instabilities.…”

Section: Discussionmentioning

confidence: 99%

“…The hyper-EMG fit uses a Gaussian center convoluted with a variable number of asymmetric exponential tails. This procedure has been shown to produce accurate mass values even in cases where overlapping peaks are fit [26]. The presence of unresolved isomers can often be deduced from a broadening of the peak shape.…”

Section: Discussionmentioning

confidence: 99%

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Mass measurements of neutron-rich indium isotopes for r -process studies

Izzo¹,

Bergmann²,

Dietrich³

et al. 2021

Phys. Rev. C

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A new series of neutron-rich indium mass measurements are reported from the TITAN multiplereflection time-of-flight mass spectrometer (MR-TOF-MS). These mass measurements cover 125−134 In (N = 76 − 85) and include ground states as well as isomeric states. The masses of nuclei in this region are known to be of great importance for accurately modeling r-process nucleosynthesis, and the significance of the reported neutron-rich indium masses is discussed in this context. Results are compared with earlier experimental data where available as well as theoretical mass models. The measurements reported here include the first mass measurements of 133,134 In, as well as the first direct mass measurement of 132 In. The masses of 125−131 In ground states and several isomers were previously measured to higher precision by Penning trap mass spectrometry, which also resolved some low-lying isomers that could not be resolved in this work. The earlier Penning trap measurements serve as excellent cross-checks for the MR-TOF-MS measurements, and in some cases the MR-TOF-MS measurements improve the literature uncertainties of higher-lying isomer masses and excitation energies. A new isomeric state for 128 In, recently reported for the first time by the JYFLTRAP group, is also confirmed by the TITAN MR-TOF-MS, with a measured excitation energy of 1813(17) keV.

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“…The uncertainties in measured masses were calculated as in [50]. The errors considered in our case were (a) the standard error of the centroid of Gaussian fitted peaks for calibrant and IOI, (b) a statistical error of σ/ √ N for Gaussian fitted peaks of calibrant, where σ is the width of Gaussian distribution and N is the number of counts in the peak, (c) the literature uncertainty of the calibration peak reported in AME2016 [16], and (d) the systematic uncertainty of the measurement device δm/m sys = 3 × 10 −7 [51].…”

Section: Methodsmentioning

confidence: 99%

Examining the nuclear mass surface of Rb and Sr isotopes in the A≈104 region via precision mass measurements

et al. 2021

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Background: The neutron-rich A≈100, N≈62 mass region is important for both nuclear structure and nuclear astrophysics. The neutron-rich segment of this region has been widely studied to investigate shape coexistence and sudden nuclear deformation. However, the absence of experimental data of more neutron-rich nuclei poses a challenge to further structure studies. The derivatives of the mass surface, namely, the two-neutron separation energy and neutron pairing gap, are sensitive to nuclear deformation and shed light on the stability against deformation in this region. This region also lies along the astrophysical r-process path, and hence precise mass values provide experimental input for improving the accuracy of the r-process models and the elemental abundances.Purpose: (a) Changes in deformation are searched for via the mass surface in the A=104 mass region at the N=66 mid-shell crossover. (b) The sensitivity of the astrophysical r-process abundances to the mass of Rb and Sr isotopic chains is studied.Methods: Masses of radioactive Rb and Sr isotopes are precisely measured using a Multiple-Reflection Time-of-Flight Mass Separator (MR-TOF-MS) at the TITAN facility. These mass values are used to calculate two-neutron separation energies, two-neutron shell gaps and neutron pairing gaps for nuclear structure physics, and one-neutron separation energies for fractional abundances and astrophysical findings.Results: We report the first mass measurements of 103 Rb and 103−105 Sr with uncertainties of less than 45 keV/c 2 . The uncertainties in the mass excess value for 102 Rb and 102 Sr have been reduced by a factor of two relative to a previous measurement. The deviations from the AME extrapolated mass values by more the 0.5 MeV have been found. Conclusions:The metrics obtained from the derivatives of the mass surface demonstrate no existence of a sub-shell gap or onset of deformation in the N=66 region in Rb and Sr isotopes. The neutron pairing gaps studied in this work are lower than the predictions by several mass models. The abundances calculated using the waiting-point approximation for r-process are affected by these new masses in comparison with AME2016 mass values.

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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

Cited by 47 publications

References 71 publications

The science case of the FRS Ion Catcher for FAIR Phase-0

The science case of the FRS Ion Catcher for FAIR Phase-0

Mass measurements of neutron-rich indium isotopes for r -process studies

Examining the nuclear mass surface of Rb and Sr isotopes in the A≈104 region via precision mass measurements

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