The precise determination of QEC-value differences between four pairs of superallowed β-emitters: 14O and 26mAl, 26mAl and 42Sc, 42Sc and 54Co, 50Mn and 54Co

Koslowsky, V.T.; Hardy, J.C.; Hagberg, E.; Azuma, R.E.; Ball, G. C.; Clifford, E. T. H.; Davies, W.G.; Schmeing, H.; Schrewe, U.J.; Sharma, K. S.

doi:10.1016/0375-9474(87)90041-8

Cited by 27 publications

(29 citation statements)

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“…The new mass values of 26,27 Al clarify conflicting data in this specific mass region. In addition, the resulting mass values of the superallowed β-emitter 38 Ca as well as of the groundstate of the β-emitter 26 Al m confirm previous measurements and corresponding theoretical corrections of the f t-values.…”

supporting

confidence: 86%

“…Penning trap mass measurements on superallowed β-emitters are needed to test and improve older reactionbased Q-value measurements. Here, the masses of 26,27 Al and 38 Ca have been confirmed and for 39 Ca a new mass value has been established. * * * This work was supported by the German BMBF under contracts 06GF151, 06GF186I and 06MZ215, by the EU under contracts HPMT-CT-2000-00197 (Marie Curie Fellowship) and RII3-CT-2004-506065 (TRAPSPEC), by the European Union Sixth Framework through RII3-EURONS (contract no.…”

mentioning

confidence: 59%

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confidence: 99%

“…This shows the potential for future mass measurements on the p-5 Fig. 9: (a) Mass differences of 38 Ca derived from two Penning trap measurements by the LEBIT facility [42] and ISOLTRAP [12]. Analog denotes the zero line the new value of the atomic-mass evaluation.…”

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confidence: 99%

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Time-separated oscillatory fields for high-precision mass measurements on short-lived Al and Ca nuclides

et al. 2008

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High-precision Penning trap mass measurements on the stable nuclide 27 Al as well as on the short-lived radionuclides 26 Al and 38,39 Ca have been performed by use of radiofrequency excitation with time-separated oscillatory fields, i.e. Ramsey's method, as recently introduced for the excitation of the ion motion in a Penning trap, was applied. A comparison with the conventional method of a single continuous excitation demonstrates its advantage of up to ten times shorter measurements. The new mass values of 26,27 Al clarify conflicting data in this specific mass region. In addition, the resulting mass values of the superallowed β-emitter 38 Ca as well as of the groundstate of the β-emitter 26 Al m confirm previous measurements and corresponding theoretical corrections of the f t-values.Introduction. -Superallowed 0 + → 0 + β-decays are sensitive probes for testing fundamental concepts of weak interaction. Hardy and Towner [1] addressed 20 such decays covering the nuclear chart from 10 C to 74 Rb and showed a consistent picture allowing a confirmation of the conserved-vector-current (CVC) hypothesis. Three properties of the nuclear transitions are merged in the comparative half-life f t : the transition energy Q EC , the half-life of the mother nuclei t 1/2 , and the branching ratio R. Since the Fermi-type β-decays are only effected by the vector part of the hadronic weak interaction, the CVC hypothesis claims identical f t -values for all transitions between

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confidence: 86%

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confidence: 59%

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Time-separated oscillatory fields for high-precision mass measurements on short-lived Al and Ca nuclides

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“…(iii) 26 Mg( 3 He, t) 26 Al (1058 keV). This reaction was observed 30 in conjunction with 14 N( 3 He, t) 14 O from a composite target in which 14 N had been implanted into 26 Mg. The target assembly was biased periodically to ∼80 kV, thus permitting the two triton groups corresponding to the 14 O ground state and the 1058 keV state of 26 Al alternately to follow the same path through a magnetic spectrometer.…”

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confidence: 93%

Currents and Their Couplings in the Weak Sector of the Standard Model

Towner¹,

Hardy²

1995

Symmetries and Fundamental Interactions in Nuclei

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Beta-decay and muon-capture experiments in nuclei are reviewed. The conserved vector current hypothesis is confirmed through the observed constancy of the vector coupling constant determined from the superallowed Fermi transitions and from the measurement of the weak-magnetism term in mirror Gamow-Teller transitions. The axial-vector and pseudoscalar coupling constants in the nucleon are determined from neutron decay and muon capture on the proton respectively. In finite nuclei, evidence for these coupling constants being reduced relative to their free-nucleon values is discussed. Meson-exchange currents are shown to be an important correction to the time-like part of the axial current as evident in first-forbidden beta decays. Tests of the Standard Model are discussed, as well as extensions beyond it involving right-hand currents and scalar interactions.Comment: 67 pages, plain LaTex, uses worldsci.sty, two figures embedded in manuscript as tex statements. A chapter for a book entitled 'The Nucleus as a Laboratory for Studying Symmetries and Fundamental Interactions', eds. E.M. Henley and W.C. Haxto

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The Evaluation of Atomic Masses

Audi

2001

Atomic Physics at Accelerators: Mass Spectrometry

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The ensemble of experimental data on the 2830 nuclides which have been observed since the beginning of Nuclear Physics are being evaluated, according to their nature, by different methods and by different groups. The two "horizontal" evaluations in which I am involved: the Atomic Mass Evaluation Ame and the Nubase evaluation belong to the class of "static" nuclear data. In this lecture I will explain and discuss in detail the philosophy, the strategies and the procedures used in the evaluation of atomic masses.Résumé L'évaluation des masses atomiques -Les données expérimentales sur les 2830 nucléides observés depuis les débuts de la Physique Nucléaire sontévaluées, suivant leur nature, par différentes méthodes et par différents groupes. Les deux evaluations "horizontales" dans les-quelles je suis impliqué : l'Évaluation des Masses Atomiques Ame et l'évaluation Nubase appartiennentà la classe des données nucléaires "statiques". Dans ce cours je vais expliquer et discuter de manière approfondie la philosophie, les stratégies et les procédures utilisées dans l'évaluation des masses atomiques. the deformations; all fall in the category of what could be called the "static" nuclear properties.Total and differential (in energy and in angle) reaction cross-sections; reaction mechanisms; and spectroscopic factors could be grouped in the class of "dynamic" nuclear properties.Certainly, one single experiment, for example a nuclear reaction study, can yield data for both 'static' and 'dynamic' properties.It is out of the scope of the present lecture to cover all aspects of nuclear properties and nuclear data. The fine structure of "static" nuclear data will be shortly described and the authors of the various evaluations presented. Then I will center this lecture on the two "horizontal" evaluations in which I am involved: the atomic mass evaluation Ame and the Nubase evaluation, both being strongly related, particularly when considering isomers.2 "Static" nuclear data 2.1 The Nsdd: data for nuclear structureThe amount of data to be considered for nuclear structure is huge. They are represented schematically in Fig. 2 for each nuclide as one column containing all levels from the groundstate at the bottom of that column to the highest known excited state. All the known properties for each of the levels are included. Very early, it was found convenient to Figure 2: Schematic representation of all the available "static" nuclear data (structure, decay, mass, radius, moments,. . . ). Each nuclide is represented as a building with its ground-state at the ground floor. The mass evaluation is represented on the ground floor, across all buildings. It includes also data for upper levels if they represent an energy relation to another nuclide, like a foot-bridge between two buildings that will allow to derive the level difference between their ground floors.organize their evaluation in a network, splitting these data according to the mass of the nuclides, the A-chains. Such a division makes sense, since most of the decay relations among ...

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The precise determination of QEC-value differences between four pairs of superallowed β-emitters: 14O and 26mAl, 26mAl and 42Sc, 42Sc and 54Co, 50Mn and 54Co

Cited by 27 publications

References 18 publications

Time-separated oscillatory fields for high-precision mass measurements on short-lived Al and Ca nuclides

Time-separated oscillatory fields for high-precision mass measurements on short-lived Al and Ca nuclides

Currents and Their Couplings in the Weak Sector of the Standard Model

The Evaluation of Atomic Masses

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