Photon-induced proton knockout from Pb

I. Bobeldijk, C. Van Den Abeele, J.-O. Adler, B.-E. Andersson, E.C. Aschenauer, L.J. De Bever, D. Branford, S.A. Bulychjov, T. Davinson, K. Hansen, D.G. Ireland, L. Isaksson, D. Ivanov, D.G. Johnstone, A. Khanov, L. Lapikás, L.J. Lindgren, G. De Meyer, B. Nilsson, H. RuijterD. Ryckbosch, A. Sandell, A.C. Shotter, B. Schröder, G. Van Der Steenhoven, P. Svensson, M.A. Van Uden, R.E. Van De Vyver

Research output: Contribution to journalArticlepeer-review

Abstract

Cross sections have been measured for the reaction Pb(γ,p) leading to the low-lying (1/2, 3/2) and (11/2, 5/2) doublets and 7/2 state in Tl using a high energy-resolution tagged photon beam of 41 to 57 MeV. The data are compared with results obtained with the reaction Pb(e,e′p) in the same recoil-momentum range. The recoil-momentum distributions derived from the (γ,p) data do not coincide with those obtained from the (e,e′p) data. Distorted-wave impulse-approximation (DWIA) calculations of which the input is constrained by the (e,e′p) data underestimate the (γ,p) data by typically one order of magnitude. An estimate of meson-exchange currents (MEC) effects using the Siegert theorem brings the DWIA-calculations close to the data. Random-phase approximation calculations also give a fair account of the data, but in this case MEC-effects are predicted to be less important.
Original languageEnglish
Pages (from-to)13-18
Number of pages6
JournalPhysics Letters B
Volume356
Issue number1
Publication statusPublished - 1 Jan 1995

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