Accurate masses of neutron-deficient nuclides close to

Schwarz, S.; Ames, F.; Audi, G.; Beck, D.; Bollen, G.; Coster, C. De; Dilling, J.; Engels, O.; Fossión, Rubén; García‐Ramos, J. E.; Henry, S.; Herfurth, F.; Heyde, K.; Kellerbauer, A.; Kluge, H.‐J.; Kohl, A.; Lamour, Emily; Lunney, D.; Martel, I.; Moore, Robert B.; Oinonen, M.; Raimbault-Hartmann, H.; Scheidenberger, C.; Sikler, G.; Szerypo, J.; Weber, C.

doi:10.1016/s0375-9474(01)00881-8

Cited by 97 publications

(28 citation statements)

References 22 publications

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“…The single-nucleon separation energy is a less clear-cut indication because of the pairing effect. In general, S 2n decreases as neutrons are added and a deviation from this behavior points to manifestations of microscopic nuclear structure effects, as it has been, e.g., observed with ISOLTRAP in the Hg and Pt region [5]. Similar investigations have been performed recently in the neutron-rich NiCu-Ga mass region [23,24] …”

Section: Nuclear Structure Studiessupporting

confidence: 74%

“…In the case of 78 Rb, for which this approach was impossible, the large resolving power of the Penning trap enabled a direct resolution of the two states 78 Rb and 78m Rb, separated by an energy E = 111.2 keV. In a series of measurements, several isomeric excitation energies were determined for some odd-mass mercury isotopes 185m Hg, 187m Hg, 191m Hg, 193m Hg, and 197m Hg [5]. In these cases an extremely high resolving power of up to 3.7 · 10 6 was applied, corresponding to excitation times of up to 8 s. Recently, the energy difference of 187 Pb and 187m Pb was determined with Penning trap mass spectrometry to be E = 33(13) keV [12].…”

Section: Resolution Of Isomeric Statesmentioning

confidence: 99%

“…Instead, one has to rely on mass predictions by models (with the aim of a quantitative prediction of the total binding energy of a nucleus) and formulas (with the aim of a numerical calculation of masses on a physical basis) [2]. For decisive tests of the predictive power of the different models, large-scale mass measurements of exotic short-lived nuclei have been performed in recent years, especially at the experimental storage ring ESR at GSI-Darmstadt [9,26,27] but also at ISOLTRAP [3][4][5]23,28]. Surely, highaccuracy mass data will contribute to further improvement and refinement of mass models and formulas and to more detailed understanding of the nuclear forces.…”

Section: Test Of Nuclear Mass Models and Mass Formulasmentioning

confidence: 99%

“…[3][4][5][6][7]). Along this line it was important to demonstrate that nuclear ground and isomeric states can be resolved [5,[8][9][10][11][12] in order to, e.g., confirm the coexistence of nuclear shapes at nearly degenerate energies (≈ 100 keV), which had been previously deduced from laser and nuclear spectroscopy [13][14][15].…”

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confidence: 99%

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Penning trap mass spectrometry for nuclear structure studies

et al. 2006

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High-precision mass measurements as performed at the Penning trap mass spectrometer ISOLTRAP at ISOLDE/CERN are an important contribution to the investigation of nuclear structure. Accurate nuclear masses with less than 0.1 ppm relative mass uncertainty not only allow stringent tests of mass models and mass formulas that are used to predict mass values of nuclides far from the valley of stability, but also to look for nuclear structure effects like shell or sub-shell closures, deformations, and halos. In addition to a sophisticated experimental setup for precise mass measurements, a radioactive ion beam facility is required that delivers a large variety of short-lived nuclides with sufficient yield. An overview of the results from the mass spectrometer ISOLTRAP is given and its limits and possibilities are described.

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Section: Nuclear Structure Studiessupporting

confidence: 74%

Section: Resolution Of Isomeric Statesmentioning

confidence: 99%

Section: Test Of Nuclear Mass Models and Mass Formulasmentioning

confidence: 99%

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confidence: 99%

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Penning trap mass spectrometry for nuclear structure studies

et al. 2006

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“…On the other hand, the energy of this isomeric state was determined to be E IS = 120(5) keV from mass measurement performed by use of the Penning-trap mass spectrometer ISOLTRAP [35]. This value differs by ΔE IS = 16 keV, representing more than 3 standard deviations, from that determined from our conversion electron measurement.…”

Section: Resultsmentioning

confidence: 66%

Decay of 185Tl, 185m+gHg, 189m+gPb and energy location of the 13/2+ isomeric states in 185Hg, 189Pb, 193Po and 197Rn

et al. 2013

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Mass and lifetime measurements of exotic nuclei in storage rings

Franzke

Geißel

Münzenberg

2008

Mass Spectrometry Reviews

217

189

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Mass and lifetime measurements lead to the discovery and understanding of basic properties of matter. The isotopic nature of the chemical elements, nuclear binding, and the location and strength of nuclear shells are the most outstanding examples leading to the development of the first nuclear models. More recent are the discoveries of new structures of nuclides far from the valley of stability. A new generation of direct mass measurements which allows the exploration of extended areas of the nuclear mass surface with high accuracy has been opened up with the combination of the Experimental Storage Ring ESR and the FRragment Separator FRS at GSI Darmstadt. In-flight separated nuclei are stored in the ring. Their masses are directly determined from the revolution frequency. Dependent on the half-life two complementary methods are applied. Schottky Mass Spectrometry SMS relies on the measurement of the revolution frequency of electron cooled stored ions. The cooling time determines the lower half-life limit to the order of seconds. For Isochronous Mass Spectrometry IMS the ring is operated in an isochronous ion-optical mode. The revolution frequency of the individual ions coasting in the ring is measured using a time-of-flight method. Nuclides with lifetimes down to microseconds become accessible. With SMS masses of several hundreds nuclides have been measured simultaneously with an accuracy in the 2 x 10(-7)-range. This high accuracy and the ability to study large areas of the mass surface are ideal tools to discover new nuclear structure properties and to guide improvements for theoretical mass models. In addition, nuclear half-lives of stored bare and highly charged ions have been measured. This new experimental development is a significant progress since nuclear decay characteristics are mostly known for neutral atoms. For bare and highly charged ions new nuclear decay modes become possible, such as bound-state beta decay. Dramatic changes in the nuclear lifetime have been observed in highly charged ions compared to neutral atoms due to blocking of nuclear decay channels caused by the modified atomic interaction. High ionization degrees prevail in hot stellar matter and thus these experiments have great relevance for the understanding of the synthesis of elements in the universe and astrophysical scenarios in general.

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Accurate masses of neutron-deficient nuclides close to

Cited by 97 publications

References 22 publications

Penning trap mass spectrometry for nuclear structure studies

Penning trap mass spectrometry for nuclear structure studies

Decay of 185Tl, 185m+gHg, 189m+gPb and energy location of the 13/2+ isomeric states in 185Hg, 189Pb, 193Po and 197Rn

Mass and lifetime measurements of exotic nuclei in storage rings

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