New results on mass measurements of stored neutron-rich nuclides in the element range from Pt to U with the FRS-ESR facility at

Chen, L.; Plaß, W. R.; Geißel, H.; Knöbel, R.; Kozhuharov, C.; Litvinov, Yu. A.; Patyk, Z.; Scheidenberger, C.; Siegień-Iwaniuk, K.; Sun, B.; Weick, H.; Beckert, K.; Béller, P.; Bosch, F.; Boutin, D.; Cáceres, L.; Carroll, J. J.; Cullen, D. M.; Cullen, I. J.; Franzke, B.; Gerl, J.; Górska, M.; Jones, G. A.; Kishada, A.; Kurcewicz, J.; Litvinov, S.; Liu, Z.; Mandal, S.; Montes, F.; Münzenberg, G.; Nolden, F.; Ohtsubo, T.; Podolyák, Zs.; Propri, R.; Rigby, S. V.; Saito, N.; Saito, T.; Shindo, Mitsuru; Steck, M.; Walker, P. M.; Williams, Spencer J.; Winkler, M.; Wollersheim, H. J.; Yamaguchi, Takayuki

doi:10.1016/j.nuclphysa.2012.03.002

Cited by 68 publications

(47 citation statements)

References 42 publications

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“…In Ref. [64], a crucial test of the predictive power of PC-PK1 was performed by the comparison with the new and accurate experimental masses in the element range from 50 to 91 [79], and it was found that the experimental data can be reproduced quite well with a rms deviation 0.859 MeV. PC-PK1 has also been applied successfully to investigate nuclear low-lying excited states [65][66][67][68][69][70][71][72], magnetic rotation [50,[80][81][82][83], antimagnetic rotation [49,51,[84][85][86], chiral rotation modes [87], fission barrier [88], and superheavy nuclei [89], etc.…”

Section: Relativistic Density Functional Pc-pk1mentioning

confidence: 99%

The limits of the nuclear landscape explored by the relativistic continuum Hartree–Bogoliubov theory

Xia

Lim

Zhao

et al. 2018

Atomic Data and Nuclear Data Tables

194

127

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The ground-state properties of nuclei with 8 Z 120 from the proton drip line to the neutron drip line have been investigated using the spherical relativistic continuum Hartree-Bogoliubov (RCHB) theory with the relativistic density functional PC-PK1. With the effects of the continuum included, there are totally 9035 nuclei predicted to be bound, which largely extends the existing nuclear landscapes predicted with other methods. The calculated binding energies, separation energies, neutron and proton Fermi surfaces, root-mean-square (rms) radii of neutron, proton, matter, and charge distributions, ground-state spins and parities are tabulated. The extension of the nuclear landscape obtained with RCHB is discussed in detail, in particular for the neutron-rich side, in comparison with the relativistic mean field calculations without pairing correlations and also other predicted landscapes. It is found that the coupling between the bound states and the continuum due to the pairing correlations plays an essential role in extending the nuclear landscape.The systematics of the separation energies, radii, densities, potentials and pairing energies of the RCHB calculations are also discussed. In addition, the α-decay energies and proton emitters based on the RCHB calculations are investigated.

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Section: Relativistic Density Functional Pc-pk1mentioning

confidence: 99%

The limits of the nuclear landscape explored by the relativistic continuum Hartree–Bogoliubov theory

Xia

Lim

Zhao

et al. 2018

Atomic Data and Nuclear Data Tables

194

127

View full text Add to dashboard Cite

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“…In the present experiment, the velocity of the ions was about 70% of the velocity of light, corresponding to kinetic energies in the range of (360 to 400) A·MeV. After electron cooling, the velocity spread of low intensity stored fragments amounted to approximately 5×10 −7 [23]. The mass and lifetime values are deduced from the revolution frequencies of the stored and cooled ions with Schottky noise analysis [24].…”

Section: New Mass and Lifetime Measurements Of Stored Exotic Nucleimentioning

confidence: 97%

“…SMS is sensitive down to single ions [24] which gives the advantage to resolve in an elegant way ground and low-lying isomeric states. In this experiment [23] we have obtained accurate new mass values of 33 neutron-rich nuclei in the element range from platinum to uranium. A novel data analysis has been applied which reduces the systematic errors to about 10 keV by taking into account the velocity profile of the cooler electrons and the residual ion-optical dispersion in this part of the storage ring.…”

Section: New Mass and Lifetime Measurements Of Stored Exotic Nucleimentioning

confidence: 99%

Recent Precision Experiments with Exotic Nuclei Produced with Uranium Projectiles and Experimental Prospects at Fair

Geißel

Chen

Dickel

et al. 2014

EPJ Web of Conferences

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Abstract.Precision experiments with relativistic fragments separated in-flight require special experimental methods to overcome the inherent large emittance from the creation in nuclear reactions and atomic interactions in matter. At GSI relativistic exotic nuclei have been produced via uranium projectile fragmentation and fission and investigated with the inflight separator FRS directly, or in combination with either the storage-cooler ring ESR or the FRS Ion Catcher. 1000 A·MeV 238 U ions were used to create 60 new neutron-rich isotopes separated and identified with the FRS to measure their production cross sections. In another experimental campaign the fragments were separated in flight and injected into the storage-cooler ring ESR for accurate mass and lifetime measurements. In these experiments we have obtained accurate new mass values analyzed via a novel method which has reduced the systematic errors for both Schottky Mass Spectrometry (SMS) and for Isochronous Mass Spectrometry (IMS). Pioneering experiments have been carried out with the FRS Ion Catcher consisting of three experimental components, the dispersive magnetic system of the FRS with a monoenergetic and a homogeneous degrader, a cryogenic stopping cell filled with pure helium and a multiple-reflection time-of flight mass separator. The FRS Ion Catcher enables high precision spectroscopy experiments with eV to keV exotic nuclides. Results from these different FRS experiments are presented in this overview together with prospects for the next-generation facility Super-FRS. The novel features of the Super-FRS compared with the present FRS will be discussed in addition.

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“…This may be achieved by the use of dedicated ion-optical systems such as energy-loss (dispersion-matched) spectrometers and isochronous sys-tems, or methods which reduce the incident phase space by cooling and energy bunching. Recent experiments [19,20] with the fragment separator FRS [21] and the storage-cooler ring ESR [22] have demonstrated the success of these efforts and are the base for the next generation facility Super-FRS [18,23], which will provide an even wider discovery potential. Analogous results can be obtained with the present and planned facilities in other heavy ion laboratories.…”

Section: Exotic Nuclei Production and Separationmentioning

confidence: 99%

“…With such electron-cooled fragment beams one can ideally perform high-resolution experiments [8]. Accurate mass measurements have been successfully carried out in the past for a large number of isotopes with previously unknown experimental masses [28,20]. In these experiments also new isotopes have been discovered.…”

Section: B Electron Cooling Of Exotic Nuclei In a Storage Ringmentioning

confidence: 99%

The Challenge of High-Resolution Spectrometer Experiments with Exotic Nuclei

et al. 2015

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Exotic atomic nuclei are short-lived species and are characterized by extreme proton-to-neutron ratios. These nuclei are created in stellar reactions and are keys to understand the abundance of the elements in the universe [1]. Exotic nuclei have quite different properties compared to the well-known species close to the valley of beta stability. This observation makes them essential for the basic understanding of nuclear matter. Nowadays, these rare isotopes can also be produced with modern powerful accelerator facilities at several laboratories worldwide [2] which solve the problems of the inherent small production cross section sections via high primary beam intensities and high energies [3,4]. However, the successful production of exotic nuclei is only the first necessary step, the separation from the primary beam and from the abundant contaminants and the measurements of their properties are of equal importance [5]. Spectrometer BasicsHigh resolution experiments with energetic heavy ions can in principle be performed in-flight with lateral-dispersive and longitudinal-dispersive electromagnetic spectrometers. Lateral-dispersive systems analyze with magnetic and electric dipole fields and apply multipole fields for focusing and correction of image aberrations [6,7]. A typical lateral-dispersive spectrometer stage, such as it is used in many accelerator based heavy ion laboratories, is shown schematically in Figure 1. A lens system is used at the entrance of a dipole magnet and a second one is placed behind to determine the focal plane conditions. The physical quantity of interest is the momentum resolving power which is mainly determined by the entrance emittance of the ion beam to be analyzed and the illuminated area in the dispersive plane of the dipole magnet. Electric fields can also be applied at low energies (at and below the Coulomb barrier) instead of magnets, but the same statements on the resolving power hold in this case as well. In longitudinal dispersive devices such as ion storage rings [8] and multiplereflection time-of-flight mass spectrometers (MR-TOF-MS) [9,10] the challenge is to achieve isochronous conditions with negligible aberrations of the higher-order optics. In general, one can achieve a higher resolving power with the longitudinal-dispersive, multi-path devices compared to the lateraldispersive spectrometers. The latter spectrometers may be applied as in-flight separators for nuclear reaction products and usually consist of a combination of several dispersive stages. The advantage of these spectrometers is the superior spatial isotopic separation of rare isotopes from the intense primary beam and the abundant contaminants. Space-charge problems are of minor importance for such lateral-dispersive spectrometers. They can have an overall maximum momentum resolving power (p/p) of several 10 4 [11,12], whereas storage rings and MR-TOF-MS systems can achieve more than 50 times higher resolving powers. In lateral spectrometers, the spatial deflections and resolving power are measured by po...

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New results on mass measurements of stored neutron-rich nuclides in the element range from Pt to U with the FRS-ESR facility at

Cited by 68 publications

References 42 publications

The limits of the nuclear landscape explored by the relativistic continuum Hartree–Bogoliubov theory

The limits of the nuclear landscape explored by the relativistic continuum Hartree–Bogoliubov theory

Recent Precision Experiments with Exotic Nuclei Produced with Uranium Projectiles and Experimental Prospects at Fair

The Challenge of High-Resolution Spectrometer Experiments with Exotic Nuclei

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