Study of Inelastic $$\boldsymbol{A}$$ ( $$\boldsymbol{p,p^{\prime}}$$ ) $$\boldsymbol{X}$$ Reaction with $${}^{\mathbf{9
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EMENTARY PARTICLES AND FIELDS Experiment
X Reaction p, p )X Study of Inelastic A (p, 9 90 with Be and Zr Nuclei at 1 GeV O. V. Miklukho1)* , A. Yu. Kisselev1)** , G. M. Amalsky1), V. A. Andreev1) , S. G. Barsov1), G. E. Gavrilov1), A. A. Zhdanov1) , A. A. Izotov1) , D. S. Ilyin1) , N. G. Kozlenko1) , P. V. Kravchenko1), D. A. Maysuzenko1) , V. I. Murzin1) , D. V. Novinskiy1), and A. V. Shvedchikov1) Received September 4, 2019; revised September 4, 2019; accepted September 4, 2019
Abstract—The secondary proton polarization and differential cross sections of the (p, p ) inelastic reaction on nuclei 9 Be and 90 Zr at the initial proton energy of 1 GeV were measured over a wide range of the scattered proton momenta at a laboratory angle of Θ = 21◦ . Scattered protons were detected by means of the magnetic spectrometer equipped with a polarimeter based on multiwire proportional chambers and carbon analyzer. A structure in the polarization and cross section data, related probably to the quasielastic scattering off nucleon correlations in the 9 Be and 90 Zr nuclei, was observed as earlier in the same data for the 12 C, 28 Si, 40 Ca and 56 Fe nuclei. A difference in the momentum distributions of the scattering cross section ratios for the 90 Zr and 12 C nuclei and for the 90 Zr and 9 Be nuclei was observed. DOI: 10.1134/S1063778820020210
1. INTRODUCTION This work is a part of the experimental program aimed at studying nucleon clustering in nuclear matter with a 1 GeV proton beam from the synchrocyclotron of the Petersburg Nuclear Physics Institute (PNPI, Gatchina) [1–4]. The scatteredproton polarization and differential cross sections of the reaction A(p, p )X with the nuclei 12 C, 28 Si, 40 Ca, and 56 Fe at an angle of Θ = 21◦ have been earlier measured [2, 4]. The measurements were performed over a wide range of the scattered-proton momentum of K = 1370−1670 MeV/c covering the pN quasielastic peak (a maximum of the peak is at K = KpN ≈ 1480 MeV/c) and a high momentumregion (K > 1530 MeV/c) up to the momentum corresponding to the excited level of the nucleus under investigation. The momentum range of K > 1530 MeV/c is kinematically preferable for quasielastic (p, p NC) scattering on a nuclear nucleon correlation (NC) [5, 6] since a NC is more massive then nucleon [1]. A structure in the experimental data have been observed [2, 4]. The structure may be due to the quasielastic scattering off multinucleon correlations in the nuclei. There were 1)
National Research Centre “Kurchatov Institute”—PNPI, Gatchina, Russia. * E-mail: [email protected] ** E-mail: [email protected]
determined with an accuracy of ±5 MeV/c the structure momentum ranges II, III, and IV corresponding to the scattering on two-, three-, and four-nucleon correlation, respectively. These ranges were for the 12 C, 28 Si, and 56 Fe nuclei [2, 4] K = 1535−1570 MeV/c (II), K = 1570−1600 MeV/c (III), K = 1600−1635 MeV/c (IV), and for the 40 Ca nucleus [1, 2] K = 1545−1575 MeV/c (II), K = 1575−1610 MeV/c (III), K = 1610−1645 MeV/c (IV). A beginning of
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