Photonuclear reactions in astrophysics

Varlamov, V.V.; Ishkhanov, B.S.; Orlin, V.N.; Peskov, N.N.; Stopani, K.A.

Авторы: Varlamov V.V., Ishkhanov B.S., Orlin V.N., Peskov N.N., Stopani K.A.
Журнал: Physics of Atomic Nuclei
Том: 77
Номер: 12
Год издания: 2014
Издательство: Pleiades Publishing, Ltd
Местоположение издательства: Road Town, United Kingdom
Первая страница: 1491
Последняя страница: 1504
DOI: 10.1134/S1063778814110088
Аннотация: Among key problems in nuclear astrophysics, that of obtaining deeper insight into the mechanism of synthesis of chemical elements is of paramount importance. The majority of heavy elements existing in nature are produced in stars via radiative neutron capture in so-called s- and r processes, which are, respectively, slow and fast, in relation to competing β−-decay processes. At the same time, we know 35 neutron-deficient so-called bypassed p-nuclei that lie between 74Se and 196Hg and which cannot originate from the aforementioned s- and r-processes. Their production is possible in (γ, n), (γ, p), or (γ,α) photonuclear reactions. In view of this, data on photoneutron reactions play an important role in predicting and describing processes leading to the production of p-nuclei. Interest in determining cross sections for photoneutron reactions in the threshold energy region, which is of particular importance for astrophysics, has grown substantially in recent years. The use of modern sources of quasimonoenergetic photons obtained in processes of inverse Compton laser-radiation scattering on relativistic electronsmakes it possible to reveal rather interesting special features of respective cross sections, manifestations of pygmy E1 and M1 resonances, or the production of nuclei in isomeric states, on one hand, and to revisit the problem of systematic discrepancies between data on reaction cross sections from experiments of different types, on the other hand. Data obtained on the basis of our new experimental–theoretical approach to evaluating cross sections for partial photoneutron reactions are invoked in considering these problems.
Добавил в систему: Варламов Владимир Васильевич

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Photonuclear reactions in astrophysicsстатья

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