Evaluation of the E2/M1 ratio in the N → ∆(1232) transition from the ⃗γ⃗p → pπ0 reaction; Physical Review C; Vol. 109, iss. 5

Evaluation of the E2/M1 ratio in the N → ∆(1232) transition from the ⃗γ⃗p → pπ0 reaction; Physical Review C; Vol. 109, iss. 5

Manylion Llyfryddiaeth
Parent link:	Physical Review C: covering nuclear physics.— .— New York: American Physical Society Vol. 109, iss. 5.— 2024.— Article number 055201, 15 p.
Awdur Corfforaethol:	Томский политехнический университет (570)
Awduron Eraill:	Mornacchi E., Pedroni P., Afzal F., Wunderlich Y., Abt S., Fiks (Fix) A. I. Alexander Ivanovich
Crynodeb:	Title screen A new data set for the helicity-dependent differential cross section of the single-meson photoproduction reaction 𝛾⁢𝑝→𝑝⁢𝜋0 was obtained for the photon energy interval 150–400 MeV. The experiment was performed at the A2 tagged photon facility of the Mainz Microtron MAMI using a circularly polarized photon beam and a longitudinally polarized proton target. The reaction products were detected with the large-acceptance Crystal Ball and TAPS calorimeters covering 97% of the full solid angle. These new results, obtained with a fine energy and polar angle binning, greatly increase both the existing quantity and quality of the data available for this observable. A moment analysis, based on a finite expansion in Legendre polynomials, was applied to these data by using a bootstrap-based fitting method to correctly account for their systematic uncertainties. From the resulting decomposition of the differential cross sections, the 𝐸⁢2/𝑀⁢1 ratio for the 𝑁→Δ⁡(1232) transition was determined to be [−2.38±0.16⁢(stat.+sys.)±0.10(model)]%. Combining this value with previous results also allowed us to evaluate the most precise available estimate of the 𝐸⁢2/𝑀⁢1 ratio to be used for all further reference and model comparisons. Текстовый файл AM_Agreement
Iaith:	Saesneg
Cyhoeddwyd:	2024
Pynciau:	электронный ресурс труды учёных ТПУ
Mynediad Ar-lein:	https://doi.org/10.1103/PhysRevC.109.055201
Fformat:	Electronig Pennod Llyfr
KOHA link:	https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=675793

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