Fundamental interactions

Jungmann, K.

doi:10.1007/s10751-007-9524-5

Cited by 4 publications

(3 citation statements)

References 41 publications

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“…Some of them are by origin (it does not include gravity), and some were recognized only very recently (it does not assume the nonzero neutrino mass). Some questions are still open, e.g., the number of generations, hierarchy of masses, super-and left-right symmetry, and others [8,9]. Therefore the simple SM may require extension if it is to play the role of a universal theory.…”

Section: Introductionmentioning

confidence: 99%

Penning traps as a versatile tool for precise experiments in fundamental physics

Blaum

Novikov

Werth

2010

Contemporary Physics

134

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This review article describes the trapping of charged particles. The main principles of electromagnetic confinement of various species from elementary particles to heavy atoms are briefly described. The preparation and manipulation with trapped single particles, as well as methods of frequency measurements, providing unprecedented precision, are discussed. Unique applications of Penning traps in fundamental physics are presented. Ultra-precise trap-measurements of masses and magnetic moments of elementary particles (electrons, positrons, protons and antiprotons) confirm CPTconservation, and allow accurate determination of the fine-structure constant α and other fundamental constants. This together with the information on the unitarity of the quarkmixing matrix, derived from the trap-measurements of atomic masses, serves for assessment of the Standard Model of the physics world. Direct mass measurements of nuclides targeted to some advanced problems of astrophysics and nuclear physics are also presented.

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Section: Introductionmentioning

confidence: 99%

Penning traps as a versatile tool for precise experiments in fundamental physics

Blaum

Novikov

Werth

2010

Contemporary Physics

134

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“…19 In the bread and wine, 'all the other things which the faithful wanted to give were symbolically represented and conjointly offered up.' 20 Offerings presented during worship are taken to represent offerings made elsewhere.…”

Section: The Church In Pre-reformation Scotlandmentioning

confidence: 99%

Pass the plate?

Philip

2024

TinS

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At a time when many congregations are changing their practice of uplifting an offering during worship, this article offers a commentary on the history of the development of offering from the early church to contemporary Scottish Reformed worship. It will be demonstrated that in both early and recent church history, the offering was understood as an element of worship, part of the people’s response to God and symbolic of a broader offering of the self to God’s service, and the case will be made for its retention in the liturgy as an invitation to participation in the ministry of the church.

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“…1). Many isotopes of Ra are available from radioactive sources such as 229 Th [10][11][12][13], or at online isotope production facilities such as ISOLDE, CERN, Switzerland [14,15].…”

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confidence: 99%

Absolute frequency measurement of the7s2 1S0–7s

et al. 2014

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Transition frequencies were determined for transitions in Ra in an atomic beam and for reference lines in Te2 molecules in a vapor cell. The absolute frequencies were calibrated against a GPS stabilized Rb-clock by means of an optical frequency comb. The 7s 2 1 S0(F = 1/2)-7s7p 1 P1(F = 3/2) transition in 225 Ra was determined to be 621 042 124(2) MHz. The measurements provide input for designing efficient and robust laser cooling of Ra atoms in preparation of a search for a permanent electric dipole moment in Ra isotopes. PACS numbers: 31.30.jp, 11.30.Er, 42.62.Fi, Radium (Ra) is the heaviest alkaline earth metal and it offers unique possibilities for measuring parity and time reversal symmetry violation. The particular atomic and nuclear [1][2][3][4][5][6][7][8] structure in Ra isotopes cause the largest enhancement for permanent electric dipole moments (EDMs) [9] in any atom. This arises from the close proximity of the 7s7p 3 P 1 and 7s6d3 D 2 states [1]. The exploitation of the enhancement from this 5 cm −1 separation requires precise knowledge of Ra atomic properties such as the absolute frequencies of transitions that are relevant for laser cooling and state manipulation (see Fig. 1). Many isotopes of Ra are available from radioactive sources such as 229 Th [10-13], or at online isotope production facilities such as ISOLDE, CERN, Switzerland [14,15].A sensitive search for EDMs requires efficient collection of the atoms in an optical trap because of the low abundance of Ra isotopes. A strategy for efficient laser cooling and trapping has been developed with the chemical homologue barium (Ba). Exploiting the strong 6s 2 1 S 0 -6s6p 1 P 1 transition [16,17] resulted in an efficiency of ∼1% for slowing and capturing Ba from an atomic beam, whereas capture efficiencies of below 10 −6 were reported for Ra when using the weak intercombination transition 7sThe optical spectrum of Ra was first studied by Rasmussen [18]. This identified Ra as an alkaline earth metal. Hyperfine splittings and isotope shifts were determined for the 7s 2 1 S 0 -7s7p 1,3 P 1 transitions by collinear laser spectroscopy [14,15] with intense Ra ion beams at ISOLDE, lifetimes of low lying states were determined in ANL, USA [9,19]; no absolute frequencies are quoted.Here we report on a laser spectroscopy measurement of the frequency of the strong 7s 2 1 S 0 -7s7p

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Fundamental interactions

Cited by 4 publications

References 41 publications

Penning traps as a versatile tool for precise experiments in fundamental physics

Penning traps as a versatile tool for precise experiments in fundamental physics

Pass the plate?

Absolute frequency measurement of the7s2 1S0–7s

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