Status of the Experimental Program on Mass Measurements of Stored Exotic Nuclei at the FRS-ESR Facility

doi:10.1016/j.nuclphysa.2006.12.050

Nuclear Physics A

Volume 787, Issues 1–4, 1 May 2007, Pages 315-320

https://doi.org/10.1016/j.nuclphysa.2006.12.050 Get rights and content

Schottky Mass Spectrometry (SMS) and Isochronous Mass Spectrometry (IMS) have been successfully applied for direct mass measurements of exotic nuclides at FRS-ESR facility at GSI. Both experimental methods are sensitive to single stored ions and can cover very efficiently a large number of nuclides in one run. Presently, more than 1100 masses of different nuclides have been covered by SMS and IMS in several FRS-ESR experiments whereby about 350 of them have been determined for the first time. In this paper, we present the status of our experimental program and use the experimental mass values to test the predictive power of modern mass models.

References (30)

H. Geissel
Nucl. Instr. and Meth. B
(1992)
B. Franzke
Nucl. Instr. and Meth. B
(1987)
F. Nolden
Nucl. Instr. and Meth. A
(2004)
M. Steck
Nucl. Instr. and Meth. A
(2004)
T. Radon
Nucl. Phys. A
(2000)
Yu.A. Litvinov
Nucl. Phys. A
(2005)
Yu.A. Litvinov
Phys. Lett. B
(2003)
A. Wapstra et al.
Nucl. Phys. A
(2003)
F. Bosch
Int. J. Mass Spectrometry
(2006)
M. Hausmann
Nucl. Instr. and Meth. A
(2000)

J. Stadlmann

Phys. Lett. B

(2004)

Yu.N. Novikov

Nucl. Phys. A

(2002)

Yu.A. Litvinov

Nucl. Phys. A

(2004)

G.A. Lalazissis

At. Data Nucl. Data Tables

(1999)

P. Möller

At. Data Nucl. Data Tables

(1995)

Cited by (18)

Exotic nuclei explored at in-flight separators
2017, Progress in Particle and Nuclear Physics
Citation Excerpt :
Programs at the storage ring ESR [68] are dedicated for highly accurate mass and half-life measurements for exotic nuclei. At the ESR ring, efforts have been made to develop two mass measurement methods, Schottky and isochronous mass spectroscopy [69]. Both methods are complementary in terms of mass accuracy and half-life.
In-flight separators have played a significant role in the physics of exotic nuclei. In the last decade, in particular, this field has expanded rapidly with the advent of the new-generation (3rd-generation) in-flight-separator facility, the RI-beam Factory (RIBF) at RIKEN that was commissioned in 2007. In addition, new experimental methods, techniques and state-of-the-art detectors at in-flight separators have developed rapidly, which has contributed considerably to this progress. One can now reach very far from the stable nuclei towards the drip lines, and even beyond in some cases. Hundreds of new isotopes have been identified, and new exotic isomers have been observed. $β$ decays and relevant $γ$ decays, including isomeric states, have clarified many new aspects of nuclear structures. A variety of direct reactions, making the best use of in-flight rare isotope (RI) beams at intermediate/high energies, have been applied for a wide range of rare isotopes. New experimental results using these methods have shown that one needs a new framework to understand structures and dynamics of exotic nuclei, such as new or lost magic numbers, novel neutron halo/skin structures and relevant reactions/excitations. A wide range of reactions associated with nucleo-synthesis in the Universe and the equation of state (EoS) of neutron-rich nuclear matter have also been studied through experiments using rare isotopes available at in-flight separators. This review article focuses its attention on how recent experimental techniques have been developed and applied to exotic nuclei at in-flight separators. We also make remarks on prospects for the near future: in the era when the 3rd-generation RI-beam facilities based on in-flight separators are being completed world-wide.
The structure of <sup>100</sup>Sn and neighbouring nuclei
2013, Progress in Particle and Nuclear Physics
The nuclear structure in the ¹⁰⁰Sn region is reviewed. State-of-the-art experimental techniques involving stable and radioactive beam facilities have enabled access to exotic nuclei in its next neighbourhood. The analysis of experimental data has established the shell structure and its evolution towards $N = Z = 50$ , seniority conservation and proton–neutron interaction in the g_9/2 orbit, the super-allowed Gamow–Teller decay of ¹⁰⁰Sn, masses and half lives along the $r p$ -path, and super-allowed $α$ decay beyond ¹⁰⁰Sn. The status of theoretical approaches in shell model and mean-field investigations is described and their predictive power assessed. Structure features of ¹⁰⁰Sn and its doubly-magic neighbours ⁵⁶Ni at $N = Z$ , ¹³²Sn and ⁷⁸Ni at $N ≫ Z$ are compared. An outlook is given on future developments of experimental and theoretical methods.
Experiments with the FRS facility at GSI
2008, Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Citation Excerpt :
Presently, more than 1100 masses of different nuclides have been covered by SMS and IMS (as illustrated in Fig. 4) in several FRS-ESR experiments [26,29,30,34,38–40] whereby about 350 of them have been determined for the first time. Our large set of new and improved mass values offers seminal comparisons with theoretical predictions [42,41]. For example, a global comparison of one-proton separation energies of all our new masses yields σrms deviations of 379, 525 and 280 keV from the HFB[44], HF + BCS[44] and FRDM[45] models.
Exotic nuclear beams produced via projectile fragmentation and fission at relativistic energies (400–1500 MeV/u) are separated in flight with the FRS. Experiments are performed in three separator branches: directly at the FRS, in combination with the storage-cooler ring ESR, and with the ALADIN-LAND reaction setup. The FRS has been successfully used as a powerful separator and also as a versatile high-resolution magnetic spectrometer. Novel technical developments are recently installed in the FRS motivated by the experimental program and by the increasing projectile intensity of the driver accelerators. In this contribution, we give an overview on the recent experimental program at the FRS with the emphasis on experiments with stored and cooled rare isotopes performed in the FRS Ring Branch.
Mass and Half-life Measurements of Stored Exotic Nuclei at the FRS-ESR Facility
2008, Nuclear Physics A
Isochronous and time-resolved Schottky mass spectrometry have been developed at the FRS-ESR facility of GSI for precise mass and half-life measurements of exotic nuclei. Both techniques are sensitive to single stored ions which makes them highly efficient. More than 1100 atomic masses have been measured meanwhile. Half-life measurements are performed with bare and few-electron ions whose decay modes can dramatically differ from the ones known in neutral atoms. After a brief description of the experimental methods, a short review of the obtained results and future perspectives will be presented.
First isochronous mass measurements at CSRe
2009, International Journal of Modern Physics E
Mass and lifetime measurement at the present ESR facility
2009, International Journal of Modern Physics E

View all citing articles on Scopus

View full text

Status of the Experimental Program on Mass Measurements of Stored Exotic Nuclei at the FRS-ESR Facility

Nucl. Instr. and Meth. B

Nucl. Instr. and Meth. B

Nucl. Instr. and Meth. A

Nucl. Instr. and Meth. A

Nucl. Phys. A

Nucl. Phys. A

Phys. Lett. B

Nucl. Phys. A

Int. J. Mass Spectrometry

Nucl. Instr. and Meth. A

Phys. Lett. B

Nucl. Phys. A

Nucl. Phys. A

At. Data Nucl. Data Tables

At. Data Nucl. Data Tables