TY  - JOUR
A1  - Ahrens, J.
T1  - First measurement of the helicity-dependent gamma p to p eta differential cross-section
JF  - European Physical Journal
Y1  - 2003
IS  - A 17 (2)
SP  - 241
EP  - 244
ER  - 
TY  - JOUR
A1  - Ahrens, J.
A1  - Kiel, B.
T1  - Helicity dependence of the γ(pol.) p(pol.) → Nπ+π0 reaction in the second resonance region
JF  - Phys. Lett. B551
Y1  - 2003
SP  - 49
EP  - 55
ER  - 
TY  - JOUR
A1  - Ahrens, J.
A1  - Kiel, B.
T1  - Helicity Amplitudes A1/2 and A3/2 for the D13(1520) Resonance Obtained from the γ⃗p⃗→pπ0 Reaction
JF  - Phys. Rev. Lett. 88
Y1  - 2002
IS  - Art. No. 232002
ER  - 
TY  - JOUR
A1  - Ahrens, J.
A1  - Kiel, B.
T1  - First Measurement of the Gerasimov-Drell-Hearn Integral for 1H from 200 to 800 MeV
JF  - Phys. Rev. Lett. 87
Y1  - 2001
IS  - Art. No. 022003
ER  - 
TY  - JOUR
A1  - Ahrens, J.
A1  - Kiel, B.
T1  - Helicity Dependence of γp → Nπ below 450 MeV and Contribution to the Gerasimov-Drell-Hearn Sum Rule
JF  - Phys. Rev. Lett. 84
Y1  - 2000
SP  - 5950
EP  - 5954
ER  - 
TY  - JOUR
A1  - Ahrens, J.
T1  - Intermediate resonance excitation in the γp→pπ0π0 reaction
JF  - Physics Letters
Y1  - 2005
IS  - 624
SP  - 173
EP  - 180
ER  - 
TY  - JOUR
A1  - Ahrens, J.
A1  - Kiel, B.
T1  - Helicity dependence of the γ p-> N π channels and multipole analysis in the Δ region
JF  - European Physical Journal
Y1  - 2004
IS  - A 21
SP  - 323
EP  - 333
ER  -