Low-energy muons via frictional cooling

Low-energy muon beams are useful for a range of physics experiments. We consider the production of low-energy muon beams with small energy spreads using frictional cooling. As the input beam, we take a surface muon source such as that at the Paul Scherrer Institute. Simulations show that the efficiency of low energy muon production can potentially be raised to 1%, which is significantly higher than that of current schemes

2′-(3-Bromo-5-chloro-2-hydroxy­benzyl­idene)isonicotinohydrazide methanol solvate

The title Schiff base compound, C13H9BrClN3O2·CH4O, was derived from the condensation reaction of 3-bromo-5-chloro­salicylaldehyde with isonicotinohydrazide. The dihedral angle between the benzene and pyridine rings is 5.9 (2)°. In the crystal structure, mol­ecules are linked through N—H⋯O, O—H⋯O, and O—H⋯Br inter­molecular hydrogen bonds, forming dimers and chains. There is also an intramolecular O—H⋯N hydrogen bond

N′-(2-Hydroxy­benzyl­idene)-4-methoxy­benzohydrazide

The title Schiff base compound, C15H14N2O3, was derived from the condensation reaction of salicylaldehyde with 4-methoxy­benzohydrazide. The dihedral angle between the two benzene rings is 2.5 (2)°. In the crystal structure, mol­ecules are linked through inter­molecular N—H⋯O hydrogen bonds, forming chains running along the b axis

N′-(2-Hydroxy­naphthyl­idene)-4-methoxy­benzo­hydrazide

The title Schiff base compound, C19H16N2O3, was derived from the condensation reaction of 2-hydr­oxy-1-naphthyl­aldehyde with 4-methoxy­benzohydrazide. The dihedral angle between the benzene ring and the naphthyl ring system is 6.8 (2)°. In the crystal structure, mol­ecules are linked through inter­molecular N—H⋯O inter­molecular hydrogen bonds, forming chains running along the c axis

2-Chloro-N′-(3,5-dibromo-2-hydroxy­benzyl­idene)benzohydrazide methanol solvate

The title Schiff base compound, C14H9Br2ClN2O2·CH4O, was derived from the condensation reaction of 3,5-dibromo­salicylaldehyde with 2-chloro­benzohydrazide. The dihedral angle between the two benzene rings is 48.2 (2)°. In the crystal structure, mol­ecules are linked through O—H⋯O and N—H⋯O inter­molecular hydrogen bonds, forming layers parallel to the bc plane. There is also an O—H⋯N intramolecular hydrogen bond

N′-(4-Hy­droxy­benzyl­idene)-2-methyl­benzohydrazide

The title hydrazone compound, C15H14N2O2, was prepared by the condensation of 4-hy­droxy­benzaldehyde with 2-methyl­benzohydrazide in methanol. The dihedral angle between the two benzene rings is 42.3 (2)°. In the crystal structure, mol­ecules are linked by inter­molecular O—H⋯O, O—H⋯N and N—H⋯O hydrogen bonds, forming a three-dimensional framework

The Karlsruhe Astrophysical Database of Nucleosynthesis in Stars Project - Status and Prospects

The KADoNiS (Karlsruhe Astrophysical Database of Nucleosynthesis in Stars) project is an astrophysical online database for cross sections relevant for nucleosynthesis in the s process and the γ process. The s-process database (http://www.kadonis.org) was started in 2005 and is presently facing its 4th update (KADoNiS v1.0). The γ-process database (KADoNiS-p, http://www.kadonis.org/pprocess) was recently revised and re-launched in March 2013. Both databases are compilations for experimental cross sections with relevance to heavy ion nucleosynthesis. For the s process recommended Maxwellian averaged cross sections for kT=5-100 keV are given for more than 360 isotopes between 1H and 210Bi. For the γ-process database all available experimental data from (p, γ), (p, n), (p, α), (α, γ), (α, n), and (α, p) reactions between 70Ge and 209Bi in or close to the respective Gamow window were collected and can be compared to theoretical predictions. The aim of both databases is a quick and user-friendly access to the available data in the astrophysically relevant energy regions. © 2014 Elsevier Inc.Peer reviewe

N′-(2,4-Dichloro­benzyl­idene)-2-methyl­benzohydrazide

In the title hydrazone compound, C15H12Cl2N2O, the dihedral angle between the two benzene rings is 12.2 (2)°. In the crystal, mol­ecules are linked through inter­molecular N—H⋯O hydrogen bonds, forming forming C(4) chains propagating in [001]

N′-(3,5-Dibromo-2-hy­droxy­benzyl­idene)-2-methyl­benzohydrazide

The asymmetric unit of the title compound, C15H12Br2N2O2, contains two independent mol­ecules in which the dihedral angles between the benzene rings are 49.5 (7) and 66.4 (7)°. Intra­molecular O—H⋯N hydrogen bonds generate S(6) ring motifs in each mol­ecule. In the crystal, mol­ecules are linked through inter­molecular N—H⋯O hydrogen bonds, forming chains along the b axis

N′-(4-Hy­droxy­benzyl­idene)-3-meth­oxy­benzohydrazide

In the title compound, C15H14N2O3, the dihedral angle between the two benzene rings is 47.9 (3)°. In the crystal, mol­ecules are linked through N—H⋯O, O—H⋯O and O—H⋯N hydrogen bonds, forming layers parallel to the ab plane