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  • 13.60.Hb  (1)
  • 23.20.CK  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Evidence for the two-body nature of theE1 transition operator in the sdf-interacting boson model (1989)
    Springer
    The European physical journal 332 (1989), S. 29-32 
    Details
    ISSN: 1434-601X
    Keywords: 21.60.Ev ; 23.20.CK ; 27.60.+j
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Two new absolute transition rates are reported for the nucleus144Sm following an (α, α′) Coulomb excitation study. They are B(E3; 3−→ 0+)=(38±3) W.u. and B(E1;3− → 2+)=(2.8±0.4)×10−3 W.u. This large E1 matrix element, along with the previously known B(E1; 1− →+) value support the interpretation of the 1− state in this nucleus as 2-phonon 2+ × 3− excitation. In the frame of the IBM-1 +f-boson model we show the need for a two-body term in the E1 transition operator. Estimates for the strengths of the one and two-body parts of the E1 transition operator are obtained from these experimental data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01292577
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The pion contribution to semi-inclusive deep inelastic scattering with slow baryons in the final state (1992)
    Springer
    The European physical journal 343 (1992), S. 461-466 
    Details
    ISSN: 1434-601X
    Keywords: 13.15.Dk ; 13.60.Hb
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We analyze the pion-exchange contribution to semi-inclusive leptoproduction on protons, with a slow nucleon or delta in the final state. We calculate the crosssection for slow protons including also the effect of the delta intermediate state, which is the dominant contribution. A comparison with recent experiment shows reasonable agreement for small Bjorkenx, if the cut-off in the pion-nucleon-delta form-factor is chosen to be around 0.7 GeV. This substantiates the recent conjecture that sea-quark distributions can be completely associated with the meson cloud, but suggests that the pion-nucleon-delta form-factor should be softer than the one used in description of nuclear forces by meson exchange. We also compare the pion-exchange and the string-fragmentation models and point out possible future experimental tests.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01289823
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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