Deposits of clastic carbonate-dominated (calciclastic) sedimentary slope systems in the rock record have been identified mostly as linearly-consistent carbonate apron deposits, even though most ancient clastic carbonate slope deposits fit the submarine fan systems better. Calciclastic submarine fans are consequently rarely described and are poorly understood. Subsequently, very little is known especially in mud-dominated calciclastic submarine fan systems. Presented in this study are a sedimentological core and petrographic characterisation of samples from eleven boreholes from the Lower Carboniferous of Bowland Basin (Northwest England) that reveals a >250 m thick calciturbidite complex deposited in a calciclastic submarine fan setting. Seven facies are recognised from core and thin section characterisation and are grouped into three carbonate turbidite sequences. They include: 1) Calciturbidites, comprising mostly of highto low-density, wavy-laminated bioclast-rich facies; 2) low-density densite mudstones which are characterised by planar laminated and unlaminated muddominated facies; and 3) Calcidebrites which are muddy or hyper-concentrated debrisflow deposits occurring as poorly-sorted, chaotic, mud-supported floatstones. These

Phd by thesis

Baryons as relativistic three-quark bound states

Scalar and tensor interactions were once competitors to the now well-established V A structure of the Standard Model weak interactions. We revisit these interactions and survey constraints from low-energy probes (neutron, nuclear, and pion decays) as well as collider searches. Currently, the most stringent limit on scalar and tensor interactions arise from 0 + ! 0 + nuclear decays and the radiative pion decay ! e , respectively. For the future, we

Probing Novel Scalar and Tensor Interactions from (Ultra)Cold Neutrons to the LHC

The status of tests of the standard electroweak model and of searches for new physics in allowed nuclear $\beta$ decay and neutron decay is reviewed including both theoretical and experimental developments. The sensitivity and complementarity of recent and ongoing experiments are discussed with emphasis on their potential to look for new physics. Measurements are interpreted using a model-independent effective field theory approach enabling to recast the outcome of the analysis in many specific new physics models. Special attention is given to the connection that this approach establishes with high-energy physics. A new global fit of available $\beta$-decay data is performed incorporating, for the first time in a consistent way, superallowed $0^+\to 0^+$ transitions, neutron decay and nuclear decays. The constraints on exotic scalar and tensor couplings involving left- or right-handed neutrinos are determined while a constraint on the pseudoscalar coupling from neutron decay data is obtained for the first time as well. The values of the vector and axial-vector couplings, which are associated within the standard model to $V_{ud}$ and $g_A$ respectively, are also updated. The ratio between the axial and vector couplings obtained from the fit under standard model assumptions is $C_A/C_V = -1.27510(66)$. The relevance of the various experimental inputs and error sources is critically discussed and the impact of ongoing measurements is studied. The complementarity of the obtained bounds with other low- and high-energy probes is presented including ongoing searches at the Large Hadron Collider.

/pdf/new-physics-searches-in-nuclear-and-neutron-beta-decay-3a6vrajspc.pdf

New physics searches in nuclear and neutron $\beta$ decay

https://cds.cern.ch/record/2310343/files/1803.08732.pdf

New physics searches in nuclear and neutron $\beta$ decay : arXiv

The {beta}-asymmetry parameter A-tilde for the pure Gamow-Teller decay of {sup 114}In is reported. The low-temperature nuclear orientation method was combined with a GEANT4-based simulation code allowing us, for the first time, to address in detail the effects of scattering and the magnetic field. The result, A-tilde=-0.994{+-}0.010{sub stat}{+-}0.010{sub syst}, constitutes the most accurate value for the asymmetry parameter of a nuclear {beta} transition to date. The value is in agreement with the Standard Model prediction of A-tilde=-1 and provides new limits on tensor-type charged weak currents.

β asymmetry parameter in the decay of 114In

Angular distribution of alpha particles from oriented Es-253,Es-254 and Fm-255 nuclei

alpha particle angular distributions of Bi-189,Bi-191,Bi-193

This paper reports measurements made using the technique of online nuclear orientation which reexamine the \ensuremath{\gamma} decay of isomeric ${}^{180}{\mathrm{Hf}}^{\mathrm{m}}$ and specifically the 501 keV ${8}^{\ensuremath{-}}$--${6}^{+}$ transition. The irregular admixture of $E2$ to $M2/E3$ multipolarity in this transition, deduced from the forward-backward asymmetry of its angular distribution, has for decades stood as the prime evidence for parity mixing in nuclear states. The experiment, based on ion implantation of the newly developed mass-separated ${}^{180}{\mathrm{Hf}}^{\mathrm{m}}$ beam at the CERN online isotope mass separator (ISOLDE) facility into an iron foil maintained at millikelvin temperatures, produces higher degrees of polarization than were achieved in previous studies of this system. The value found for the $E2/M2$ mixing ratio, $\ensuremath{\epsilon}=\ensuremath{-}0.0324$(16)(19), is in close agreement with the previous published average value $\ensuremath{\epsilon}=\ensuremath{-}0.030$(2), in full confirmation of the presence of the irregular $E2$ admixture in the 501 keV transition. The temperature dependence of the forward-backward asymmetry has been measured over a more extended range of nuclear polarization than previously possible, giving further evidence for parity mixing of the ${8}^{\ensuremath{-}}$ and ${8}^{+}$ levels and the deduced $E2/M2$ mixing ratio.

/pdf/confirmation-of-parity-violation-in-the-g-decay-of-180-hf-m-37u6h4c7hk.pdf

Confirmation of parity violation in the γ decay of 180 Hf m

A new value for the hyperfine magnetic field of copper impurities in iron is obtained by combining resonance frequencies from experiments involving {beta}-NMR on oriented nuclei on {sup 59}Cu, {sup 69}Cu, and {sup 71}Cu with magnetic moment values from collinear laser spectroscopy measurements on these isotopes. The resulting value, i.e., B{sub hf}(CuFe) = -21.794(10) T, is in agreement with the value adopted until now but is an order of magnitude more precise. It is consistent with predictions from ab initio calculations. Comparing the hyperfine field values obtained for the individual isotopes, the hyperfine anomalies in Fe were determined to be {sup 59{Delta}69}=0.15(9)% and {sup 71{Delta}69}=0.07(11)%.

D. Zakoucky

Papers

β asymmetry parameter in the decay of 114In

Angular distribution of alpha particles from oriented Es-253,Es-254 and Fm-255 nuclei

alpha particle angular distributions of Bi-189,Bi-191,Bi-193

Confirmation of parity violation in the γ decay of 180 Hf m

Hyperfine Field and Hyperfine Anomalies of Copper Impurities in Iron