A high-resolution multi-reflection time-of-flight mass spectrograph for precision mass measurements at RIKEN/SLOWRI

Schury, P.; Wada, M.; Ito, Yuta; Arai, Fumiya; Naimi, S.; Sonoda, T.; Wöllnik, H.; Shchepunov, V.A.; Smorra, Christian; Yuan, Cheng-Hui

doi:10.1016/j.nimb.2014.05.016

Cited by 73 publications

(52 citation statements)

References 53 publications

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“…This capability has until now been limited to storage rings. As we have demonstrated [13,16], and herein further demonstrate, the MRTOF-MS allows for a considerably less complex data analysis than that used for storage rings. As the first step toward mass spectrographic identification of superheavy elements (SHEs), a gas cell connected to an MRTOF-MS was installed in front of the gas-filled recoil ion separator GARIS-II [6].…”

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confidence: 54%

“…By momentarily lowering the outermost potential on either mirror, ions can be allowed to enter or exit the MRTOF-MS. A detailed description can be found in Ref. [16].…”

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confidence: 99%

“…It achieves mass resolving powers R m > 100 000 with flight times shorter than 20 ms for even the heaviest nuclei [11,16]. Additionally, it is a true spectrographas opposed to a spectrometer-making it capable of mass determinations with, in principle, as few as one detected ion.…”

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confidence: 99%

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First online multireflection time-of-flight mass measurements of isobar chains produced by fusion-evaporation reactions: Toward identification of superheavy elements via mass spectroscopy

et al. 2017

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International audienceUsing a multireflection time-of-flight mass spectrograph located after a gas cell coupled with the gas-filled recoil ion separator GARIS-II, the masses of several α-decaying heavy nuclei were directly and precisely measured. The nuclei were produced via fusion-evaporation reactions and separated from projectilelike and targetlike particles using GARIS-II before being stopped in a helium-filled gas cell. Time-of-flight spectra for three isobar chains, Fr204-Rn204-At204-Po204, Fr205-Rn205-At205-Po205-Bi205, and Fr206-Rn206-At206, were observed. Precision atomic mass values were determined for Fr204–206, Rn204,205, and At204,205. Identifications of Bi205, Po204,205, Rn206, and At206 were made with N≲10 detected ions, representing the next step toward use of mass spectrometry to identify exceedingly low-yield species such as superheavy element ions

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confidence: 54%

“…By momentarily lowering the outermost potential on either mirror, ions can be allowed to enter or exit the MRTOF-MS. A detailed description can be found in Ref. [16].…”

mentioning

confidence: 99%

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First online multireflection time-of-flight mass measurements of isobar chains produced by fusion-evaporation reactions: Toward identification of superheavy elements via mass spectroscopy

et al. 2017

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“…Thus, a compact setup can be maintained while providing high mass resolving powers up to about 200 000 for millisecond flight times [36][37][38]. In contrast to conventional ToF-MS where the flight path limits the achievable precision to typically a level of 10 −6 these devices can reach relative mass uncertainties of about 10 −7 or even below [39]. MR-ToF-MS devices are thus suitable for mass measurements with a precision usually required to study global nuclear structure trends.…”

Section: Nobel Symposium Ns160 -Chemistry and Physics Of Heavy And Sumentioning

confidence: 99%

Mass measurements and ion-manipulation techniques applied to the heaviest elements

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2016

EPJ Web Conf.

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Abstract. High-precision mass measurements of radionuclides with stateof-the-art mass spectrometry allows us to obtain accurate binding energies. These reflect changes in the nuclear structure. Two-nucleon separation energies, for example, are sensitive indicators of shell closures and the onset of deformation. In addition, masses provide a benchmark for theoretical nuclear models and support their improvement with respect to a better predictive power. In the region of the heaviest elements this enables mapping the strength of shell effects and their extension as recently demonstrated for N = 152. Accurate masses can furthermore provide anchor points to fix decay chains in the mass surface. Moreover, advanced ion-manipulation techniques developed in the context of mass spectrometry pave the way for novel types of experiments such as trap-assisted decay spectroscopy of nuclear state-selected samples. This opens new perspectives for a mass number assignment of decay chains originating from yet unknown superheavy nuclides.

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“…In the last few years, these compact devices have been commissioned at GSI [95,96], RIKEN [97], and ISOLDE/CERN [98]. One of the first online mass measurements was performed at RIKEN using 8 Li + (T 1/2 = 838 ms).…”

Section: The Achievable Relative Precision Of Pmts With the Tof-icr Tmentioning

confidence: 99%

Toward precision mass measurements of neutron-rich nuclei relevant to r-process nucleosynthesis

et al. 2015

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The open question of where, when, and how the heavy elements beyond iron enrich our Universe has triggered a new era in nuclear physics studies. Of all the relevant nuclear physics inputs, the mass of very neutron-rich nuclides is a key quantity for revealing the origin of heavy elements beyond iron. Although the precise determination of this property is a great challenge, enormous progress has been made in recent decades, and it has contributed significantly to both nuclear structure and astrophysical nucleosynthesis studies. In this review, we first survey our present knowledge of the nuclear mass surface, emphasizing the importance of nuclear mass precision in r-process calculations. We then discuss recent progress in various methods of nuclear mass measurement with a few selected examples. For each method, we focus on recent breakthroughs and discuss possible ways of improving the weighing of r-process nuclides.

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A high-resolution multi-reflection time-of-flight mass spectrograph for precision mass measurements at RIKEN/SLOWRI

Cited by 73 publications

References 53 publications

First online multireflection time-of-flight mass measurements of isobar chains produced by fusion-evaporation reactions: Toward identification of superheavy elements via mass spectroscopy

First online multireflection time-of-flight mass measurements of isobar chains produced by fusion-evaporation reactions: Toward identification of superheavy elements via mass spectroscopy

Mass measurements and ion-manipulation techniques applied to the heaviest elements

Toward precision mass measurements of neutron-rich nuclei relevant to r-process nucleosynthesis

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