Study of reactions in the -resonance region

S. Abdel-Samad; J. Bojowald; A. Budzanowski; A. Chatterjee; J. Ernst; D. Frekers; P. Hawranek; J. Ilieva; L. Jarczyk; K. Kilian; S. Kliczewski; W. Klimala; D. Kolev; M. Kravcíková; T. Kutsarova; J. Lieb; H. Machner; A. Magiera; G. Martinská; H. Nann; L. Pentchev; D. Protic; P. von Rossen; B. J. Roy; R. Siudak; A. Strzalkowski; R. Tsenov; M. Ulicný; J. Urbán; K. Zwoll

doi:10.1140/epja/i2002-10286-2

EPJ

Study of $p + d \rightarrow ^{3}{\mathrm A} + \pi$ reactions in the $\Delta$ -resonance region

S. Abdel-Samad¹, J. Bojowald¹, A. Budzanowski³, A. Chatterjee⁹, J. Ernst⁷, D. Frekers⁸, P. Hawranek¹^,3, J. Ilieva¹^,5, L. Jarczyk³, K. Kilian¹, S. Kliczewski⁴, W. Klimala¹^,3, D. Kolev⁶, M. Kravcíková¹², T. Kutsarova⁵, J. Lieb¹⁰, H. Machner¹, A. Magiera¹^,3, G. Martinská¹, H. Nann¹¹, L. Pentchev⁵, D. Protic¹, P. von Rossen¹, B. J. Roy⁹, R. Siudak⁴, A. Strzalkowski³, R. Tsenov⁶, M. Ulicný¹^,12, J. Urbán⁷^,12^* and K. Zwoll²

¹ Institut für Kernphysik, Forschungszentrum Jülich, Jülich, Germany
² Zentrallabor für Elektronik, Forschungszentrum Jülich, Jülich, Germany
³ Institute of Physics, Jagellonian University, Kraków, Poland
⁴ Institute of Nuclear Physics, Kraków, Poland
⁵ Institute of Nuclear Physics and Nuclear Energy, Sofia, Bulgaria
⁶ Physics Faculty, University of Sofia, Sofia, Bulgaria
⁷ Institut für Strahlen- und Kernphysik der Universität Bonn, Bonn, Germany
⁸ Institut für Kernphysik, Universität Münster, Münster, Germany
⁹ Nuclear Physics Division, BARC, Bombay, India
¹⁰ Physics Department, George Mason University, Fairfax, VA, USA
¹¹ IUCF, Indiana University, Bloomington, IN, USA
¹² P.J. Safarik University, Kosice, Slovakia
¹³ Technical University Kosice, Kosice, Slovakia

Abstract

A stack of annular detectors made of high-purity germanium was used to measure $p + d\to\noindent {^3{\rm He}} + \pi^0$ and $p + d\to{^3{\rm H}} + \pi^ +$ differential and total cross-sections at beam momenta from 900 MeV/c to 1050 MeV/c. The total cross-sections are consistent with $\Delta$ -excitation. The differential data consist of two components. One corresponds to large momentum transfer from the projectile to the pion, the other to small momentum transfer. The former shows an independence of the slope as a function of the momentum transfer t (scaling). The scale parameter is different for $\pi^ +$ and $\pi^0$ emission which violates isospin symmetry. The second component which is almost isotropic is in agreement with isospin symmetry. It is approximately a quarter of the total yield in the $\Delta$ -resonance region.

15th European Conference on Atoms Molecules and Photons (ECAMP)
June 30 to July 4, 2025
Innsbruck, Austria

EPJ

Study of reactions in the -resonance region

Conference announcements

Study of $p + d \rightarrow ^{3}{\mathrm A} + \pi$ reactions in the $\Delta$ -resonance region