Total cross sections of reactions 6,8He+28Si, 9,11Li+28Si and role of neutron rearrangement

4 Jun 2018, 16:09
18m
Kunibiki Messe (Matsue)

Kunibiki Messe

Matsue

Oral contribution Session 4

Speaker

Prof. Viacheslav Samarin (Joint Institute for Nuclear Research)

Description

It is well known that neutron rearrangement may play an important role in nuclear reactions. The aim of this work is the investigation of the reactions with light nuclei having different external neutron shells. A series of experiments on measurement of total cross sections for reactions 4,6,8He + Si and 6,7,9,11Li + Si in the beam energy range 5–50 AMeV was performed at Flerov Laboratory of Nuclear Reactions (FLNR), Joint Institute for Nuclear Research (JINR). The interesting results were the unusual enhancements of total cross sections for 9,11Li + Si reactions as compared with 6,7Li + Si reactions and 6,8He + Si reactions as compared with 4He + Si reaction. The microscopic approach based on the numeric solution of the time-dependent Schrödinger equation [1] for the external neutrons of weakly bound projectile nuclei combined with the optical model is used for description of the observed effects [2]. These are explained by the rearrangement of external neutrons and thus the increase of neutron probability density in the region between the two nuclei depending on the collision energy. The calculated cross sections are in agreement with the experimental data on the total reaction cross sections for the studied nuclei.

References
[1] V. V. Samarin. Description of nucleon-transfer and fusion reactions within time-dependent approaches and coupled-channel method. Phys. At. Nucl. 78 128 (2017).
[2] Yu. E. Penionzhkevich, Yu. G. Sobolev, V. V. Samarin, and M. A. Naumenko. Peculiarities in total cross sections of reactions with weakly bound nuclei 6He, 9Li. Phys. At. Nucl. 80 928 (2017).

Primary author

Prof. Viacheslav Samarin (Joint Institute for Nuclear Research)

Co-authors

Mr Mikhail Naumenko (Joint Institute for Nuclear Research) Prof. Yuri Penionzhkevich (Joint Institute for Nuclear Research)

Presentation Materials