Photoproduction of π0 mesons off neutrons in the nucleon resonance region.
Precise angular distributions have been measured for the first time for the photoproduction of π0 mesons off neutrons bound in the deuteron. The effects from nuclear Fermi motion have been eliminated by a complete kinematic reconstruction of the final state. The influence of final-state-interaction effects has been estimated by a comparison of the reaction cross section for quasifree protons bound in the deuteron to the results for free protons and then applied as a correction to the quasifree neutron data. The experiment was performed at the tagged photon facility of the Mainz Microtron MAMI with the Crystal Ball and TAPS detector setup for incident photon energies between 0.45 and 1.4 GeV. The results are compared to the predictions from reaction models and partial-wave analyses based on data from other isospin channels. The model predictions show large discrepancies among each other and the present data will provide much tighter constraints. This is demonstrated by the results of a new analysis in the framework of the Bonn-Gatchina coupled-channel analysis which included the present data.
Department of Physics, University of Basel, Switzerland.
M
M
Dieterle
Department of Physics, University of Basel, Switzerland.
I
I
Keshelashvili
Institut für Kernphysik, University of Mainz, Germany.
J
J
Ahrens
Department of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom.
J R M
JR
Annand
Institut für Kernphysik, University of Mainz, Germany.
H J
HJ
Arends
Kent State University, Kent, Ohio, USA.
K
K
Bantawa
Institut für Kernphysik, University of Mainz, Germany.
P A
PA
Bartolome
Institut für Kernphysik, University of Mainz, Germany and Helmholtz-Institut für Strahlen- und Kernphysik, University of Bonn, Germany.
R
R
Beck
Petersburg Nuclear Physics Institute, Gatchina, Russia.
V
V
Bekrenev
INFN Sezione di Pavia, Pavia, Italy.
A
A
Braghieri
School of Physics, University of Edinburgh, Edinburgh, United Kingdom.
D
D
Branford
Center for Nuclear Studies, The George Washington University, Washington, DC, USA.
W J
WJ
Briscoe
University of California at Los Angeles, Los Angeles, California, USA.
J
J
Brudvik
Lebedev Physical Institute, Moscow, Russia.
S
S
Cherepnya
Center for Nuclear Studies, The George Washington University, Washington, DC, USA.
B
B
Demissie
Institut für Kernphysik, University of Mainz, Germany and Department of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom and Center for Nuclear Studies, The George Washington University, Washington, DC, USA.
E J
EJ
Downie
II. Physikalisches Institut, University of Giessen, Germany.
P
P
Drexler
Lebedev Physical Institute, Moscow, Russia.
L V
LV
Fil'kov
Laboratory of Mathematical Physics, Tomsk Polytechnic University, Tomsk, Russia.
A
A
Fix
School of Physics, University of Edinburgh, Edinburgh, United Kingdom.
D I
DI
Glazier
Department of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom.
D
D
Hamilton
Institut für Kernphysik, University of Mainz, Germany.
E
E
Heid
Mount Allison University, Sackville, New Brunswick E4L 1E6, Canada.
D
D
Hornidge
Department of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom.
D
D
Howdle
University of Regina, Regina, Saskatchewan S4S 0A2 Canada.
G M
GM
Huber
Department of Physics, University of Basel, Switzerland.
I
I
Jaegle
Institut für Kernphysik, University of Mainz, Germany.
O
O
Jahn
School of Physics, University of Edinburgh, Edinburgh, United Kingdom.
T C
TC
Jude
Department of Physics, University of Basel, Switzerland.
A
A
Käser
Institut für Kernphysik, University of Mainz, Germany and Lebedev Physical Institute, Moscow, Russia.
V L
VL
Kashevarov
Institute for Nuclear Research, Moscow, Russia.
R
R
Kondratiev
Rudjer Boskovic Institute, Zagreb, Croatia.
M
M
Korolija
Petersburg Nuclear Physics Institute, Gatchina, Russia.
S P
SP
Kruglov
Department of Physics, University of Basel, Switzerland.
B
B
Krusche
Petersburg Nuclear Physics Institute, Gatchina, Russia.
A
A
Kulbardis
Institute for Nuclear Research, Moscow, Russia.
V
V
Lisin
Department of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom.
K
K
Livingston
Department of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom.
I J D
IJ
MacGregor
Department of Physics, University of Basel, Switzerland.
Y
Y
Maghrbi
Department of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom.
J
J
Mancell
Kent State University, Kent, Ohio, USA.
D M
DM
Manley
Center for Nuclear Studies, The George Washington University, Washington, DC, USA.
Z
Z
Marinides
Institut für Kernphysik, University of Mainz, Germany.
M
M
Martinez
Department of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom.
J C
JC
McGeorge
Department of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom.
E
E
McNicoll
Rudjer Boskovic Institute, Zagreb, Croatia.
D
D
Mekterovic
II. Physikalisches Institut, University of Giessen, Germany.
V
V
Metag
Rudjer Boskovic Institute, Zagreb, Croatia.
S
S
Micanovic
Mount Allison University, Sackville, New Brunswick E4L 1E6, Canada.
D G
DG
Middleton
INFN Sezione di Pavia, Pavia, Italy.
A
A
Mushkarenkov
University of California at Los Angeles, Los Angeles, California, USA.
B M K
BM
Nefkens
Institut für Kernphysik, University of Mainz, Germany and Helmholtz-Institut für Strahlen- und Kernphysik, University of Bonn, Germany.
A
A
Nikolaev
II. Physikalisches Institut, University of Giessen, Germany.
R
R
Novotny
Department of Physics, University of Basel, Switzerland.
M
M
Oberle
Institut für Kernphysik, University of Mainz, Germany.
M
M
Ostrick
Institut für Kernphysik, University of Mainz, Germany and Center for Nuclear Studies, The George Washington University, Washington, DC, USA.
B
B
Oussena
INFN Sezione di Pavia, Pavia, Italy.
P
P
Pedroni
Department of Physics, University of Basel, Switzerland.
F
F
Pheron
Institute for Nuclear Research, Moscow, Russia.
A
A
Polonski
University of California at Los Angeles, Los Angeles, California, USA.
S N
SN
Prakhov
Department of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom.
J
J
Robinson
Department of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom.
G
G
Rosner
Department of Physics, University of Basel, Switzerland.
T
T
Rostomyan
Institut für Kernphysik, University of Mainz, Germany and Helmholtz-Institut für Strahlen- und Kernphysik, University of Bonn, Germany.
S
S
Schumann
School of Physics, University of Edinburgh, Edinburgh, United Kingdom.
M H
MH
Sikora
The Catholic University of America, Washington, DC, USA.
D
D
Sober
University of California at Los Angeles, Los Angeles, California, USA.
A
A
Starostin
Rudjer Boskovic Institute, Zagreb, Croatia.
I
I
Supek
Institut für Kernphysik, University of Mainz, Germany and II. Physikalisches Institut, University of Giessen, Germany.
M
M
Thiel
Institut für Kernphysik, University of Mainz, Germany.
A
A
Thomas
Institut für Kernphysik, University of Mainz, Germany and Helmholtz-Institut für Strahlen- und Kernphysik, University of Bonn, Germany.
M
M
Unverzagt
School of Physics, University of Edinburgh, Edinburgh, United Kingdom.
D P
DP
Watts
Department of Physics, University of Basel, Switzerland.
D
D
Werthmüller
Department of Physics, University of Basel, Switzerland.
L
L
Witthauer