Determining low-energy characteristics of the pp interaction in the d + 1H → p + p + n reaction

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The study results of the d + 1H → p + p + n reaction are presented. A kinematically complete experiment with using a deuteron beam energy of 15.3 MeV at the U-120 accelerator of the MSU SINP was carried out. A proton from the breakup of the singlet pp state and a secondary neutron were registered in coincidence. As a result of the study, the low-energy characteristics of pp interaction, namely, the energy value of the virtual singlet pp state and the corresponding value of the pp scattering length were determined.

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作者简介

A. Kasparov

Institute for Nuclear Research of Russian Academy of Sciences

Email: vyacheslavmitsuk@yandex.ru
俄罗斯联邦, Moscow

M. Mordovskoy

Institute for Nuclear Research of Russian Academy of Sciences

Email: vyacheslavmitsuk@yandex.ru
俄罗斯联邦, Moscow

V. Mitsuk

Institute for Nuclear Research of Russian Academy of Sciences

编辑信件的主要联系方式.
Email: vyacheslavmitsuk@yandex.ru
俄罗斯联邦, Moscow

V. Lebedev

Moscow State University

Email: vyacheslavmitsuk@yandex.ru

Skobeltsyn Research Institute of Nuclear Physics

俄罗斯联邦, Moscow

A. Spassky

Moscow State University

Email: vyacheslavmitsuk@yandex.ru

Skobeltsyn Research Institute of Nuclear Physics

俄罗斯联邦, Moscow

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2. Fig. 1. Experimental setup designed based on the results of kinematic modeling: 1 — vacuum scattering chamber (∅ 23 cm with a 20 μm thick lavsan exit window), 2 — CH2 target (30 μm thick), 3 — neutron detector (∅ 5 cm, 5 cm thick), 4 — ΔE detector (∅ 5 mm, 25 μm thick), 5 — E detector (∅ 10 mm, 1000 μm thick).

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3. Fig. 2. Experimental ∆E–E diagram. “Spots” correspond to reactions: 1 — d + p → d + p; 2 — d + 12C → d + 12C; 3 — d + 12C → p + 13C; 4 — d + p → p + d. The gray area on the proton locus is the simulated events from the breakup of the singlet pp system with Epp = 400 ± 100 keV and the emission angle of both protons in the range of 18° ± 2°.

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4. Fig. 3. Energy correlations Ep – En measured in the reaction d + 1H → p + p + n at Θp = 18° ± 2° and Θn = 38° ± 1.5°.

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5. Fig. 4. The final spectrum of proton energy measured in coincidence with neutrons, depending on the emission angle of the second undetected proton Θp = 18° ± 0.5° (dotted curve), Θp = 18° ± 2° (solid) and Θp = 18° ± 4° (dashed).

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6. Fig. 5. Comparison of the experimentally obtained proton energy spectrum with the simulated spectra corresponding to Epp = 200 ± 10 (dotted curve), 400 ± 50 (solid), 600 ± 50 keV (dashed).

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7. Fig. 6. Dependence of χ2 on ΔEpp for different values ​​of Epp. The curves correspond to the values ​​of Epp: 1 — 330, 2 — 340, 3 — 350, 4 — 360, 5 — 375 keV.

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8. Fig. 7. Dependence of χ2 on Epp. Each value of Epp corresponds to its optimal value ΔEpp opt. The curve is an approximation by a quadratic polynomial. The dashed lines show errors in determining Epp.

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