Hard photon and neutral pion production in cold nuclear matter
L. Aphecetche, J. Bacelar, H. Delagrange, D. d'Enterria, M. Hoefman, H. Huisman, N. Kalantar-Nayestanaki, H. Löhner, G. Martínez, T. Matulewicz, J. Messchendorp, M. -J. Mora, R. Ostendorf, S. Schadmand, Y. Schutz, M. Seip, A. Taranenko, R. Turrisi, M. -J. Van Goethem, M. Volkerts, V. Wagner, H. W. Wilschut
Abstract
The production of hard photons and neutral pions in 190 MeV proton induced reactions on C, Ca, Ni, and W targets has been for the first time concurrently studied. Angular distributions and energy spectra up to the kinematical limit are discussed and the production cross-sections are presented. From the target mass dependence of the cross-sections the propagation of pions through nuclear matter is analyzed and the production mechanisms of hard photons and primordial pions are derived. It is found that the production of subthreshold particles proceeds mainly through first chance nucleon-nucleon collisions. For the most energetic particles the mass scaling evidences the effect of multiple collisions.
Create a lesson
Related papers
New Neutron Polarizabilities from Deuterium Compton Scattering at HIγS
D. Godagama, M. W. Ahmed, B. Crowe et al.
Search for the 229Pa Parity Doublet via Internal-Conversion Spectroscopy at FRIB
Silviu-Marian Udrescu, Aiden Boyer, Lan Cheng et al.
Cumulative protons and pions at the intermediate energies in the FRAGM experiment
M. A. Martemianov, B. M. Abramov, S. A. Bulychjov et al.
Precise and accurate nuclear electric quadrupole moment of 223Ra from molecular spectroscopy
C. M. Fajardo-Zambrano, M. Athanasakis-Kaklamanakis, L. Lalanne et al.
Differential measurement of global polarization of Λ, Ξ, and Ω hyperons in Au+Au collisions at sNN=7.7--27~GeV from the RHIC Beam Energy Scan-II
The STAR Collaboration
Regularity of core coupled high-spin structure in neutron-rich 196-202Au isotopes approaching N =126
Y. Cho, Y. H. Kim, A. Navin et al.