Recent improvements of ISOLTRAP: absolute mass measurements of exotic nuclides at 10−8 precision

Kellerbauer, A.

doi:10.1016/s1387-3806(03)00262-8

Cited by 14 publications

(10 citation statements)

References 37 publications

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“…The mass-resolving power R = m/δm that can be achieved with the TOF cyclotron technique is directly proportional to the cyclotron frequency and the duration of the quadrupolar excitation [5]:…”

Section: Setup and Techniquementioning

confidence: 99%

“…It has been in operation since the second half of the 1980s and has already been used to carry out mass measurements on more than 300 radionuclides [3,4]. Over the past few years, the efficiency and precision of ISOLTRAP have been significantly improved [5], thus making the experiment applicable for highprecision measurements on very short-lived nuclides as those required for this study.…”

Section: Introductionmentioning

confidence: 99%

“…where K = 2π 3h (hc) 6 ln 2/(m e c 2 ) 5 is a product of fundamental constants and V R is a nucleus-independent radiative correction. Together with V us and V ub , the two other elements of the first row, V ud can be used to perform a partial unitarity test of the CKM matrix by checking whether the sum of the squares of these three elements is equal to unity.…”

Section: Introductionmentioning

confidence: 99%

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High-precision masses of neutron-deficient rubidium isotopes using a Penning trap mass spectrometer

et al. 2007

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The atomic masses of the neutron-deficient radioactive rubidium isotopes [74][75][76][77]79,80,83 Rb have been measured with the Penning trap mass spectrometer ISOLTRAP. Using the time-of-flight cyclotron resonance technique, relative mass uncertainties ranging from 1.6 × 10 −8 to 5.6 × 10 −8 were achieved. In all cases, the mass precision was significantly improved as compared with the prior Atomic-Mass Evaluation; no significant deviations from the literature values were observed. The exotic nuclide 74 Rb, with a half-life of only 65 ms, is the shortest-lived nuclide on which a high-precision mass measurement in a Penning trap has been carried out. The significance of these measurements for a check of the conserved-vector-current hypothesis of the weak interaction and the unitarity of the Cabibbo-Kobayashi-Maskawa matrix is discussed.

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Section: Setup and Techniquementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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High-precision masses of neutron-deficient rubidium isotopes using a Penning trap mass spectrometer

et al. 2007

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“…By combination of elementselective laser ionization and high-resolution mass spectrometry we demonstrated not only resolution but also isolation of ground and excited states and prepared isomerically pure ensembles of 68 Cu and 70 Cu. To this end, the resonant ionization laser ion source (RILIS) [2] and the triple-trap mass-spectrometer ISOLTRAP [3][4][5] at ISOLDE/CERN [6] were used. Together withcoincidence studies this method allowed to determine the low-energy structure of 70 Cu and to unambiguously identify three -decaying isomers.…”

Section: Introductionmentioning

confidence: 99%

Laser Ionization and Penning Trap Mass Spectrometry – A Fruitful Combination for Isomer Separation and High-precision Mass Measurements

et al. 2006

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We have demonstrated for the first time that element-selective laser ionization in combination with ultra-high resolution mass spectrometry can be used to prepare isomerically pure ion ensembles. Together with -coincidence studies this method allowed a determination of the low-energy structure and the unambiguous identification of triple -decaying isomerism in 70 Cu. By selective resonant ionization and measurement of the masses of these three states using ISOLTRAP at ISOLDE/CERN with a relative uncertainty of m=m % 5 Á10 À8 a clear state-to-mass assignment was possible which resolved the assignment puzzle in 70 Cu.

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“…The mass of the ion of interest is obtained from the comparison of its cyclotron frequency with that of a well-known ''reference mass.'' The mass resolving power in the precision Penning trap is the product of the cyclotron frequency of the ion and the duration of the radio frequency (rf) excitation [16] and can reach 10 7 for medium-heavy nuclides and an excitation time of 10 s. After recent upgrades and improvements [16], calibration measurements using a carbon cluster ion source have shown that the limit of ISOLTRAP's overall relative uncertainty is now 8 10 ÿ9 [17].…”

mentioning

confidence: 99%

Direct Mass Measurements on the Superallowed Emitter Rb74 and Its Daughter Kr74: Isospin-Symmetry-Breaking Correction for Standard-Model Tests

et al. 2004

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The decay energy of the superallowed decay 74 Rb 74 Kr was determined by direct Penning trap mass measurements on both the mother and the daughter nuclide using the time-of-flight resonance technique and was found to be Q 10 416:8 4:5 keV. The exotic nuclide 74 Rb, with a half-life of only 65 ms, is the shortest-lived nuclide on which a high-precision mass measurement in a Penning trap has been carried out. Together with existing data for the partial half-life as well as theoretical corrections, the decay energy yields a comparative half-life of Ft 3084 15 s for this decay, in agreement with the mean value for the series of the lighter nuclides from 10 C to 54 Co. Assuming conserved vector current, this result allows for an experimental determination of the isospin-symmetry-breaking correction C . According to the conserved-vector-current (CVC) hypothesis, a postulate now incorporated into the standard model, the vector-current part of the weak interaction is not influenced by the strong interaction. The comparative half-life ft of a superallowed transition between analog states should therefore be only a function of the matrix element hM V i that connects the two states and the vector coupling constantwhere f is the statistical rate function, t is the partial halflife, and K is a product of fundamental constants. The nuclear matrix element, which depends on the isospins T i and T f of the initial and final states, is hM V i 2 2 for T 1 analog states. As the decay occurs within the nuclear volume, theoretical corrections must be applied to f and hM V i 2 [2], such that the corrected ft value, denoted by the symbol Ft, is expected to be truly constant, i.e., independent of the nuclear charge Z of the decay pair. This leads to the following overall expression for the Ft value:where R is the nucleus-dependent radiative correction, C is the isospin-symmetry-breaking correction, and V R is the nucleus-independent radiative correction. Experimentally, Ft is accessible via the following measured quantities: the decay energy Q, which enters to the fifth power into the calculation of the statistical rate function f [4], the half-life T 1=2 , and the branching ratio R. The latter two yield the partial half-life t T 1=2 1 P EC =R, where P EC is the calculated electron capture fraction.The most precise value for V ud , the up-down quark mixing element of the Cabibbo-Kobayashi-Maskawa (CKM) matrix, can be extracted from the mean Ft value of nuclear decay, in conjunction with the Fermi coupling constant from muon decay G [5]:Together with particle-physics data from K and B meson decay [6], this can be used to test CKM unitarity. In this Letter we report on high-precision mass measurements on short-lived nuclides which reduce the uncertainty of the decay energy of the superallowed decay 74 Rb 74 Kr by almost 2 orders of magnitude. These data extend the nuclear-physics contribution to tests of the CVC hypothesis and the unitarity of the CKM matrix to a new nuclear-shell region. They permit an experimental determination of C a...

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Recent improvements of ISOLTRAP: absolute mass measurements of exotic nuclides at 10−8 precision

Cited by 14 publications

References 37 publications

High-precision masses of neutron-deficient rubidium isotopes using a Penning trap mass spectrometer

High-precision masses of neutron-deficient rubidium isotopes using a Penning trap mass spectrometer

Laser Ionization and Penning Trap Mass Spectrometry – A Fruitful Combination for Isomer Separation and High-precision Mass Measurements

Direct Mass Measurements on the Superallowed Emitter Rb74 and Its Daughter Kr74: Isospin-Symmetry-Breaking Correction for Standard-Model Tests

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