| Autor: |
Steenbakkers MF; Department of Physics and Astronomy, Free University de Boelelaan, 1081 HV Amsterdam, The Netherlands., van Batenburg MF, Bauer TS, Blok HP, Botto T, Dodge GE, Groep DL, Heimberg P, Hesselink WH, Higinbotham DW, Jans E, Jun Y, Ketel TJ, Lapikás L, de Lange DJ, Norum BE, Passchier I, Starink R, Todor L, de Vries H |
| Jazyk: |
angličtina |
| Zdroj: |
Physical review letters [Phys Rev Lett] 2005 Oct 21; Vol. 95 (17), pp. 172501. Date of Electronic Publication: 2005 Oct 18. |
| DOI: |
10.1103/PhysRevLett.95.172501 |
| Abstrakt: |
The reactions 4He(e, e' p3He)pi- and 4He(e, e' p3He)pi0 were studied simultaneously, and for the first time, in a large kinematical domain including the Delta-resonance region. This was achieved by detecting the recoiling 3He and 3H nuclei instead of the emitted pions. The dependences of the cross section on the recoil momentum p(rec), the invariant mass WpiN, and the direction thetapi,q' and phipi,q' of the produced pion, are globally well described by the results of (quasifree) distorted-wave impulse approximation calculations. However, in the Delta-resonance region there are clear discrepancies, which point to medium modifications of the Delta in 4He. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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