Nuclear-matter distribution in the proton-rich nuclei $^7$Be and $^8$B from intermediate energy proton elastic scattering in inverse kinematics
nucl-ex
/ Authors
A. V. Dobrovolsky, G. A. Korolev, A. G. Inglessi, G. D. Alkhazov, G. Colò, I. Dillmann, P. Egelhof, A. Estradé, F. Farinon, H. Geissel
and 18 more authors
S. Ilieva, Y. Ke, A. V. Khanzadeev, O. A. Kiselev, J. Kurcewicz, X. C. Le, Yu. A. Litvinov, G. E. Petrov, A. Prochazka, C. Scheidenberger, L. O. Sergeev, H. Simon, M. Takechi, S. Tang, V. Volkov, A. A. Vorobyov, H. Weick, V. I. Yatsoura
/ Abstract
Absolute differential cross sections for elastic $p^7$Be and $p^8$B small-angle scattering were measured in inverse kinematics at an energy of 0.7 GeV/u at GSI Darmstadt. The hydrogen-filled ionization chamber IKAR was used as an active target to detect the recoil protons. The projectile tracking and isotope identification were performed with multi-wire proportional chambers and scintillation detectors. The measured cross sections were analysed using the Glauber multiple-scattering theory. The root-mean-square (rms) nuclear matter radii $R_{\rm m} = 2.42 (4)$ fm for $^7$Be and $R_{\rm m} = 2.58 (6)$ fm for $^8$B were obtained. The radial density distribution deduced for $^8$B exhibits a proton halo structure with the rms halo radius $R_{\rm h} = 4.24 (25)$ fm. A comparison of the deduced experimental radii is displayed with existing experimental and theoretical data.