BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CERN//INDICO//EN
BEGIN:VEVENT
SUMMARY:Triple angular correlations in inelastic nuclear collisions with g
 amma-ray emission: astrophysical aspect
DTSTART;VALUE=DATE-TIME:20261028T130500Z
DTEND;VALUE=DATE-TIME:20261028T132000Z
DTSTAMP;VALUE=DATE-TIME:20261030T050558Z
UID:indico-contribution-6349@cern.ch
DESCRIPTION:Speakers: A.L. Barabanov (National Research Center Kurchatov I
 nstitute\, Moscow\, Russia\; National Research Nuclear University MEPhI\, 
 Moscow\, Russia)\nInelastic nuclear collisions accompanied by gamma emissi
 on from excited nuclei serve as a valuable source of information regarding
  nuclear reaction mechanisms and the characteristics (energy\, spin\, pari
 ty) of nuclear levels. Notably\, however\, gamma radiation resulting from 
 such collisions - occurring not only on the Sun but also on other stars - 
 can be detected on Earth (see\, e.g.\, [1]). The intensity of this radiati
 on allows for an assessment of the concentration and energy of the collidi
 ng particles within stellar atmospheres. In principle\, further informatio
 n regarding the fluxes of colliding particles can be obtained\, as the ene
 rgy (frequency) of gamma quanta emitted in a specific direction depends on
  the trajectories of the colliding and outgoing particles. As a step towar
 d acquiring such data\, the characteristics of gamma radiation emitted at 
 various angles relative to the reaction axis in the inelastic scattering o
 f protons (with energies ranging from 5.44 to 25 MeV) by the ¹²C nucleus
  was calculated in [2] (the 2⁺ state 4.439 MeV was excited). The calcula
 ted gamma-line shapes (intensity versus energy) showed good agreement with
  the results of earlier measurements.\n\nEvident expression for the differ
 ential cross section of the analogous 12C(n\,n’γ) reaction—involving 
 excitation of the same 4.439 MeV state—is presented in a recent study [3
 ]\, alongside the results of measurements of this cross section. Using a m
 ore general approach to describing angular correlations—based on functio
 ns of three vectors that are independent of the choice of coordinate axes\
 , as first described in [4]—we derived the double-differential cross sec
 tions for both the 12C(n\,n’γ) reaction and the analogous 12C(p\,p’γ
 ). In our view\, differential cross sections expressed in terms of such ve
 ctor functions are better suited for calculating gamma-line shapes. This a
 pproach to describing triple angular correlations can be extended to other
  similar reactions\, including those of astrophysical significance.\n\nRef
 erences\n1. D.J. Forrest\, R.J. Murphy. Solar Physics\, 1988\, v. 118\, is
 s. 1\, p. 123-135.\n2. J. Kiener. Phys. Rev. C\, 2019\, v. 99\, iss. 1\, 0
 14605.\n3. P. Filonchik et al. Int. J. Mod. Phys. E\, 2024\, v. 33\, iss. 
 12\, 2441020.\n4. L.C. Biedenharn. Pure and Applied Physics\, v. 9 (Nuclea
 r Spectroscopy\, Edited by F.Ajzenberg-Selove)\, part B\, 1960\, section V
 \, subsection C\, p. 732 (Academic Press\, New York and London).\n\nhttps:
 //indico.particle.mephi.ru/event/626/contributions/6349/
LOCATION: Conference Hall 1
URL:https://indico.particle.mephi.ru/event/626/contributions/6349/
END:VEVENT
END:VCALENDAR