https://doi.org/10.1140/epja/i2014-14100-4
Regular Article - Experimental Physics
Cross section ratio and angular distributions of the reaction p + d → 3He + η at 48.8 MeV and 59.8 MeV excess energy
1
Division of Nuclear Physics, Department of Physics and Astronomy, Uppsala University, Box 516, 75120, Uppsala, Sweden
2
Department of Nuclear Physics, National Centre for Nuclear Research, ul. Hoza 69, 00-681, Warsaw, Poland
3
Institute of Physics, Jagiellonian University, ul. Reymonta 4, 30-059, Kraków, Poland
4
Physikalisches Institut, Eberhard-Karls-Universität Tübingen, Auf der Morgenstelle 14, 72076, Tübingen, Germany
5
Kepler Center für Astro- und Teilchenphysik, Physikalisches Institut der Universität Tübingen, Auf der Morgenstelle 14, 72076, Tübingen, Germany
6
Institut für Kernphysik, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Str. 9, 48149, Münster, Germany
7
High Energy Physics Department, National Centre for Nuclear Research, ul. Hoza 69, 00-681, Warsaw, Poland
8
Department of Physics, Indian Institute of Technology Bombay, Powai, 400076, Mumbai, Maharashtra, India
9
Institut für Kernphysik, Forschungszentrum Jülich, 52425, Jülich, Germany
10
Jülich Center for Hadron Physics, Forschungszentrum Jülich, 52425, Jülich, Germany
11
Institut für Experimentalphysik I, Ruhr-Universität Bochum, Universitätsstr. 150, 44780, Bochum, Germany
12
Zentralinstitut für Engineering, Elektronik und Analytik, Forschungszentrum Jülich, 52425, Jülich, Germany
13
Physikalisches Institut, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erwin-Rommel-Str. 1, 91058, Erlangen, Germany
14
Institute for Theoretical and Experimental Physics, State Scientific Center of the Russian Federation, Bolshaya Cheremushkinskaya 25, 117218, Moscow, Russia
15
II. Physikalisches Institut, Justus-Liebig-Universität Gießen, Heinrich-Buff-Ring 16, 35392, Giessen, Germany
16
Department of Physics, Indian Institute of Technology Indore, Khandwa Road, Indore, 452017, Madhya Pradesh, India
17
III. Physikalisches Institut B, Physikzentrum, RWTH Aachen, 52056, Aachen, Germany
18
High Energy Physics Division, Petersburg Nuclear Physics Institute, Orlova Rosha 2, Gatchina, 188300, Leningrad district, Russia
19
Veksler and Baldin Laboratory of High Energiy Physics, Joint Institute for Nuclear Physics, Joliot-Curie 6, 141980 Dubna, Moscow region, Russia
20
August Chełkowski Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007, Katowice, Poland
21
The Henryk Niewodniczański Institute of Nuclear Physics, Polish Academy of Sciences, 152 Radzikowskiego St, 31-342, Kraków, Poland
22
Dzhelepov Laboratory of Nuclear Problems, Joint Institute for Nuclear Physics, Joliot-Curie 6, 141980 Dubna, Moscow region, Russia
23
High Energy Accelerator Research Organization KEK, 305-0801, Tsukuba, Ibaraki, Japan
24
Department of Cosmic Ray Physics, National Centre for Nuclear Research, ul. Uniwersytecka 5, 90-950, Łódź, Poland
* e-mail: florianbergmann@uni-muenster.de
Received:
7
February
2014
Revised:
30
April
2014
Accepted:
14
May
2014
Published online:
17
June
2014
We present new data for angular distributions and on the cross section ratio of the p+d → 3He + η reaction at excess energies of Q = 48.8 MeV and Q = 59.8 MeV. The data have been obtained at the WASA-at-COSY experiment (Forschungszentrum Jülich) using a proton beam and a deuterium pellet target. While the shape of obtained angular distributions show only a slow variation with the energy, the new results indicate a distinct and unexpected total cross section fluctuation between Q = 20 MeV and Q = 60 MeV, which might indicate the variation of the production mechanism within this energy interval.
Present address: Peter Grünberg Institut (PGI-6), Forschungszentrum Jülich, 52425, Jülich, Germany
Present address: Albert Einstein Center for Fundamental Physics, University of Bern, Sidlerstrasse 5, 3012, Bern, Switzerland
Present address: Department of Physics and Astrophysics, University of Delhi, Delhi, 110007, India
© SIF, Springer-Verlag Berlin Heidelberg, 2014
