When I learnt to program, there were only two languages that were worth learning, Algol 60 and assembler. ‘Programming languages’ was once an easy course to teach, but as more languages were introduced it became harder and harder, and most books for undergraduates turned from textbooks into encyclopedias, trying to cover all known languages. Somewhere along the line the idea that it was worth t...

Present day chiral nucleon-nucleon potentials up to next-to-next-tonext-to leading order and three nucleon forces at next-to-next-to leading order are used to analyze nucleon-deuteron radiative capture at deuteron laboratory energies below Ed ≈ 100 MeV. The differential cross section and the deuteron analyzing powers Ay(d) and Ayy are presented and compared to data. The theoretical predictions ...

If A q (β, α, k) is the scattering amplitude, corresponding to a potential q ∈ L 2 (D), where D ⊂ R 3 is a bounded domain, and e ikα·x is the incident plane wave, then we call the radiation pattern the function A(β) := A q (β, α, k), where the unit vector α, the incident direction, is fixed, and k > 0, the wavenumber, is fixed. It is shown that any function f (β) ∈ L 2 (S 2), where S 2 is the u...