A novel ion cooling trap for multi-reflection time-of-flight mass spectrograph

Ito, Yuta; Schury, P.; Wada, M.; Naimi, S.; Smorra, Christian; Sonoda, T.; Mita, H.; Takamine, A.; Okada, Kazuya; Ozawa, A.; Wöllnik, H.

doi:10.1016/j.nimb.2013.07.069

Cited by 29 publications

(15 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As ions left the gas cell via the small exit orifice, they were transported via rf-multipole ion guides to a triplet of rf quadrupole ion traps, similar to that reported in Ref. [20], where they accumulated and cooled. The ions were then orthogonally ejected from the central trap, accelerated by a pulsed drift tube to 1.5 keV, and transported 2.5 m to a second pulsed drift tube and deceleration optics, followed by a second set of rf-quadrupole traps wherein the ions were recaptured.…”

mentioning

confidence: 74%

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

Self Cite

View full text Add to dashboard Cite

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

show abstract

mentioning

confidence: 74%

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

Self Cite

View full text Add to dashboard Cite

show abstract

“…In these devices cooled short ion bunches are reflected between electrostatic mirrors. 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].…”

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

confidence: 99%

“…Hence the beam preparation stages are usually the same involving a buffer gas stopping cell and an RFQ buncher. At RIKEN an MR-ToF-MS setup has been installed behind the new gas-filled recoil separator GARIS II [36]. First on-line measurements have been performed in neutron-deficient Fr isotopes [40].…”

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

confidence: 99%

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

Block

2016

EPJ Web Conf.

View full text Add to dashboard Cite

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.

show abstract

“…The first and second ion trap systems, each consisting of a pair of linear Paul traps on either side of a "flat" ion trap [24], have the same geometry and were filled with helium buffer gas at ∼10 −2 mbar. In the first trap system, the fore and aft linear Paul traps accumulated the continuous ion beams from the gas cell and from a thermal ion source, respectively, in order to precool and prebunch the ion beam prior to transfer to the flat trap.…”

mentioning

confidence: 99%

First Direct Mass Measurements of Nuclides around Z=100 with a Multireflection Time-of-Flight Mass Spectrograph

Ito¹,

Schury²,

Wada³

et al. 2018

Phys. Rev. Lett.

Self Cite

View full text Add to dashboard Cite

The masses of 246 Es, 251 Fm, and the transfermium nuclei 249−252 Md and 254 No, produced by hot-and cold-fusion reactions, in the vicinity of the deformed N ¼ 152 neutron shell closure, have been directly measured using a multireflection time-of-flight mass spectrograph. Mt, were determined. These new masses were compared with theoretical global mass models and demonstrated to be in good agreement with macroscopic-microscopic models in this region. The empirical shell gap parameter δ 2n derived from three isotopic masses was updated with the new masses and corroborates the existence of the deformed N ¼ 152 neutron shell closure for Md and Lr. DOI: 10.1103/PhysRevLett.120.152501 Precision mass measurements of unstable nuclei, providing a direct measure of the nuclear binding energy, are invaluable for the study of nuclear shell evolution and collective effects, such as deformations, far from stability [1,2]. For transfermium nuclei and the yet poorly investigated region towards the superheavy nuclei (SHN), where proton repulsion becomes a generally dominant feature, the description of nuclear lifetimes depends crucially on shell stabilization effects mainly driven by deformed shells [3][4][5]. Theoretical studies with increasing particle numbers investigate the so-called "island of stability" [6], where features like the continuing decrease of energy gaps [7] and the emergence of shape coexistence [8] have a crucial impact on the predicted position and localization of stability regions and the corresponding lifetimes of the nuclei. Although the first experimental evidence for SHN has reached the region of the predicted subshell closure at N ¼ 162 [9-11], the deformed shell closure at N ¼ 152 for transfermium nuclei (see, e.g., [12]) and, as recently pointed out, weaker shell effects in the vicinity [13], still represents the cutting edge for thorough experimental investigations. The transfermium nuclei, however, can be produced only online, in heavy-ion fusion and nucleon transfer reactions, and consequently only low yields are available for study, necessitating highly efficient techniques. Direct mass measurements of transfermium nuclei have so far been performed for only six nuclei-four isotopes of nobelium and two isotopes of lawrencium-with the Penning trap mass spectrometer SHIPTRAP [14,15].In this Letter, we report the first implementation of a multireflection time-of-flight mass spectrograph (MRTOF MS) for transfermium nuclei as shown in Fig. 1, including new mass measurements of 246 Es, 251 Fm, [249][250][251][252]

show abstract

A novel ion cooling trap for multi-reflection time-of-flight mass spectrograph

Cited by 29 publications

References 9 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

First Direct Mass Measurements of Nuclides around Z=100 with a Multireflection Time-of-Flight Mass Spectrograph

Contact Info

Product

Resources

About