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SUMMARY:Study of the 16O(alpha\, alpha)16O(3–) and 15N(alpha\, t)16O(3
 –) reactions mechanism at E_alpha = 30.3 MeV
DTSTART;VALUE=DATE-TIME:20220712T120000Z
DTEND;VALUE=DATE-TIME:20220712T123000Z
DTSTAMP;VALUE=DATE-TIME:20261017T220249Z
UID:indico-contribution-589@events.sinp.msu.ru
DESCRIPTION:Speakers: Natali Zelenskaya (Lomonosov Moscow State University
 \, Scobeltsyn Institute of Nuclear Physics)\nThe study of the differential
  cross sections angular dependence of the reactions 16O(alpha\, alpha) [ 1
  ] and 15N(alpha\, t)16O(3–) [2] at E_alpha = 30.3 MeV was carried out. 
 Both magnitude and shape of the measured cross sections and large value of
  E3 transition between the ground and 3– level of 16O nucleus justify th
 e use of CCBA formalism\, when both couple channels method (CC) and DWBA a
 re combined (FRESCO [3]) as well as the compound nucleus (CN) mechanism (T
 ALYS [4]) in the theoretical analysis. The strength of coupling factors we
 re introduced from the experimental reduced transition probability B(E3). 
 The exchange of 12С cluster with summation over all states allowed by the
  selection rules for transfer mechanism at both reactions and proton strip
 ping for the (alpha\, t)-reaction were taking into account. The spectrosco
 pic amplitudes are obtained in the shell model. The calculated angular dis
 tributions\, together with the experimental ones\, are shown in figs. It c
 an be seen that in (alpha\, alpha')-scattering\, the cross section is dete
 rmined by collective excitation in the front hemisphere and by 12С exchan
 ge at large angles. The СN contribution is not noticeable. In the reactio
 n (alpha\, t)\, the main contribution is made by the CN mechanism\, else t
 he contribution of the proton stripping is noticeable at forward hemispher
 e. The 12C exchange mechanism is important at theta_t > 90\\circ. The perf
 ormed analysis showed that the calculated cross sections of both reactions
  agree with the experimental one without introducing normalization factors
  only when all considered mechanisms are taken into account.\n\n![Cross se
 ctions of (alpha\, apha') (a) and (alpha\, t) (b) reactions: thin solid li
 ne – CC (stripping)\, dotted – exchange of 12С \, dot-dash – CN\, f
 at solid – sum\, black dots – experiment][1]\n\n1. A.V. Ignatenko\, V.
  M. Lebedev\, N. V. Orlova et al.\, Phys. Atom. Nucl. 59\, 565 (1996).\n2.
  A.V. Ignatenko\, V. M. Lebedev\, N. V. Orlova et al.\, Phys. Atom. Nucl. 
 61\, 1 (1998).\n3. J. Thompson\, Comp. Phys. Rep. 7\, 167 (1988)\; http://
  www.fresco.org.uk.\n4. J. Koning\, S. Hilaire\, and M. C. Duijvestijn\, T
 ALYS: AIP Conf. Proc. 769\, 1154 (2005).\n \n\n\n \n\n\n  [1]: https://dis
 k.yandex.ru/i/ZGo5QxpSOvjtmw\n\nhttps://events.sinp.msu.ru/event/8/contrib
 utions/589/
LOCATION: Физический факультет\, ЦФА
URL:https://events.sinp.msu.ru/event/8/contributions/589/
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