Fast-timing study of the l-forbidden 1/2(+) -> 3/2(+) M1 transition in Sn-129

The levels in Sn-129 populated from the beta(-) decay of In-129 isomers were investigated at the ISOLDE facility of CERN using the newly commissioned ISOLDE Decay Station (IDS). The lowest 1/2(+) state and the 3/2(+) ground state in 129Sn are expected to have configurations dominated by the neutron s(1/2) (l = 0) and d(3/2) (l = 2) single-particle states, respectively. Consequently, these states should be connected by a somewhat slow l-forbidden M1 transition. Using fast-timing spectroscopy we havemeasured the half-life of the 1/2(+) 315.3-keV state, T-1/2 = 19(10) ps, which corresponds to a moderately fast M1 transition. Shell-model calculations using the CD-Bonn effective interaction, with standard effective charges and g factors, predict a 4-ns half-life for this level. We can reconcile the shell-model calculations to the measured T-1/2 value by the renormalization of the M1 effective operator for neutron holes.

Pulsar timing irregularities and the imprint of magnetic field evolution

Context. The rotational evolution of isolated neutron stars is dominated by the magnetic field anchored to the solid crust of the star. Assuming that the core field evolves on much longer timescales, the crustal field evolves mainly though Ohmic dissipation and the Hall drift, and it may be subject to relatively rapid changes with remarkable effects on the observed timing properties. Aims. We investigate whether changes of the magnetic field structure and strength during the star evolution may have observable consequences in the braking index n. This is the most sensitive quantity to reflect small variations of the timing properties that are caused by magnetic field rearrangements. Methods. We performed axisymmetric, long-term simulations of the magneto-thermal evolution of neutron stars with state-of-the-art microphysical inputs to calculate the evolution of the braking index. Relatively rapid magnetic field modifications can be expected only in the crust of neutron stars, where we focus our study. Results. We find that the effect of the magnetic field evolution on the braking index can be divided into three qualitatively different stages depending on the age and the internal temperature: a first stage that may be different for standard pulsars (with n ~ 3) or low field neutron stars that accreted fallback matter during the supernova explosion (systematically n < 3); in a second stage, the evolution is governed by almost pure Ohmic field decay, and a braking index n > 3 is expected; in the third stage, at late times, when the interior temperature has dropped to very low values, Hall oscillatory modes in the neutron star crust result in braking indices of a high absolute value and both positive and negative signs. Conclusions. Current magneto-thermal evolution models predict a large contribution to the timing noise and, in particular, to the braking index, from temporal variations of the magnetic field. Models with strong (≳ 1014 G) multipolar or toroidal components, even with a weak (~1012 G) dipolar field are consistent with the observed trend of the timing properties.

Fast X-ray transients towards the Galactic bulge with the Rossi X-ray Timing Explorer

In X-ray binaries, rapid variability in X-ray flux of greater than an order of magnitude on time-scales of a day or less appears to be a signature of wind accretion from a supergiant companion. When the variability takes the form of rare, brief, bright outbursts with only faint emission between them, the systems are called supergiant fast X-ray transients (SFXTs). We present data from twice-weekly scans of the Galactic bulge by the Rossi X-ray Timing Explorer that allow us to compare the behaviour of known SFXTs and possible SFXT candidates with the persistently bright supergiant X-ray binary 4U 1700−377. We independently confirm the orbital periods reported by other groups for SFXTs SAX J1818.6−1703 and IGR J17544−2619. The new data do not independently reproduce the orbital period reported for XTE J1739−302, but slightly improve the significance of the original result when the data are combined. The bulge source XTE J1743−363 shows a combination of fast variability and a long-term decline in activity, the latter behaviour not being characteristic of supergiant X-ray binaries. A far-red spectrum of the companion suggests that it is a symbiotic neutron star binary rather than a high-mass binary, and the reddest known of this class: the spectral type is approximately M8 III.

Pulse phase-coherent timing and spectroscopy of CXOU J164710.2−45521 outbursts

We present a long-term phase-coherent timing analysis and pulse-phase resolved spectroscopy for the two outbursts observed from the transient anomalous X-ray pulsar CXOU J164710.2−455216. For the first outburst we used 11 Chandra and XMM–Newton observations between 2006 September and 2009 August, the longest baseline yet for this source. We obtain a coherent timing solution with P = 10.61065583(4) s, Ṗ = 9.72(1) × 10−13 s s−1 and P̈ = –1.05(5) × 10−20 s s−2. Under the standard assumptions this implies a surface dipolar magnetic field of ∼1014 G, confirming this source as a standard B magnetar. We also study the evolution of the pulse profile (shape, intensity and pulsed fraction) as a function of time and energy. Using the phase-coherent timing solution we perform a phase-resolved spectroscopy analysis, following the spectral evolution of pulse-phase features, which hints at the physical processes taking place on the star. The results are discussed from the perspective of magnetothermal evolution models and the untwisting magnetosphere model. Finally, we present similar analysis for the second, less intense, 2011 outburst. For the timing analysis we used Swift data together with 2 XMM–Newton and Chandra pointings. The results inferred for both outbursts are compared and briefly discussed in a more general framework.

The Contents and Timing of a European Banking Union: Reflections on the differing views. CEPS Essay (No. 2), 30 November 2012

Although views differ on the precise contents and timing of a genuine banking union, there is wide political agreement in principle on the need for three basic and vital elements: European bank supervision, a European deposit guarantee scheme (DGS) and a European bank resolution mechanism. In this CEPS Essay, H. Onno Ruding offers his personal views on the progress achieved to date, the outstanding issues that will prove the most difficult to resolve and recommendations on the way forward.

Germany and the Eurocrisis: The timing of politics and the politics of timing. ACES Cases No. 2014.3

This paper speculates on the future of the euro. It uses Germany as a prism for the discussion about what might be done next to bolster the Euro. Researching the future—always a challenging task—is made harder when multiple state actors contend for prominence on the basis of shifting coalitions at home, all while interacting at an international level. That said, almost everyone accepts that German choices will play the central role in the path ultimately chosen. This paper thus foregrounds Germany’s role in shaping the way ahead, and it does so through an explicitly political framework focused primarily on the electoral implausibility of an alternative German policy course.

The Interregional Association Agreement between the European Union and Mercosur: Is the Timing Right? Bruges Political Research Papers 46/2015.

The European Union (EU) and Mercosur talks have been stalled since discussions were resumed in 2000. Recurring protectionist and institutional obstacles have slowed down negotiations. The financial crisis, however, has resulted in low domestic demand in the EU. This has made the interregional association agreement (IAA) with Mercosur more attractive. The loss of the Generalized Scheme of Preference (GSP) status and the lack of a Free Trade Agreement (FTA) with the EU have both disadvantaged Mercosur. A further window of opportunity is opening up in Mercosur. In Brazil, there have been cries for a change in government. In Argentina, presidential elections will take place in October 2015 and will assuredly bring an end to Kirchnerismo. A change in leadership in both countries is expected to make agreement more likely. Protectionist policies are not expected to remain as high if there is change in government. This will provide the EU with an opportunity to advance the negotiations and conclude the IAA.

Democratic planning in action; time for timing.

Mode of access: Internet.

Prevalence and timing of oral sex with opposite-sex partners among females and males aged 15-24 years : United States, 2007-2010 /

Mode of access: Internet.

Timing and firing /

Prepared for U.S. Atomic Energy Commission.

Timing and firing : final report /

"Issued: November 23, 1962"--Cover ; "August 1962"--Title page.

Timing and firing : preliminary report /

"Nuclear explosions - peaceful applications."

Du Pont products for crop use; a summary of recommended uses, dosages, timing, tolerances and limitations.

Mode of access: Internet.