Antineutron annihilation cross sections on C, Al, Cu, Ag, Sn and Pb targets were measured in the momentum range 50-400 MeV/c. The full set of data is very well described by a parameterization in which the target mass number and momentum dependence are factorized. The A dependence is, within 2%, consistent with a A(2/3) scaling law, indicating a pure surface process. The momentum dependence is, within 20%, consistent with that expected from a properly averaged contribution of the elementary cross section for (n) over barp and (n) over barn annihilation, indicating that the process is due to the interaction with single nucleons on the surface.

Antineutron-nucleus annihilation cross sections below 400 MeV/c

BOTTA, Elena;BRESSANI, Tullio;MARCELLO, Simonetta;
2002-01-01

Abstract

Antineutron annihilation cross sections on C, Al, Cu, Ag, Sn and Pb targets were measured in the momentum range 50-400 MeV/c. The full set of data is very well described by a parameterization in which the target mass number and momentum dependence are factorized. The A dependence is, within 2%, consistent with a A(2/3) scaling law, indicating a pure surface process. The momentum dependence is, within 20%, consistent with that expected from a properly averaged contribution of the elementary cross section for (n) over barp and (n) over barn annihilation, indicating that the process is due to the interaction with single nucleons on the surface.
2002
697
209
209
C; Al; Cu; Sn; Ag; Pb((n)over-bar; X); E at 50-400 MeV/c; measured annihilation sigma; deduced parameters; reaction mechanism features
Astrua M; Botta E; Bressani T; Calvo D; Casalegno C; Feliciello A; Filippi A; Marcello S; Agnello M
File in questo prodotto:
File Dimensione Formato  
NPA_697_2002_209.pdf

Accesso riservato

Tipo di file: POSTPRINT (VERSIONE FINALE DELL’AUTORE)
Dimensione 240.97 kB
Formato Adobe PDF
240.97 kB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/2846
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? ND
social impact