Abstract
We investigate breakup dynamics in 6 Li elastic scattering on heavy targets (T = 209 Bi or 208 Pb) near the Coulomb barrier energy. Since the subsystem of 6 Li has a bound state as deuteron (n + p = d ), a four-body channel (6 Li + T → n + p + α + T) and a three-body channel (6 Li + T → d + α + T) get entangled during scattering as a breakup channel. Both channels are precisely treated with the four-body version of the continuum-discretized coupled-channels method (four-body CDCC). Four-body CDCC well reproduces measured elastic cross sections with no adjustable parameter. We then estimate the channel coupling effects by dividing the breakup channel into fourand three-body channels. It is found that 6 Li breakup is mainly induced by a three-body channel.
Highlights
Projectile breakup is essential in reactions of weakly-bound nuclei and appears as a strong coupling effect between elastic and breakup channels
We focus on four-body dynamics of 6Li elastic scattering from the point of view of four- and three-body channel coupling effects
6Li scattering on heavy targets are well described by four-body continuum-discretized coupled-channels method (CDCC) with no adjustable parameter
Summary
Projectile breakup is essential in reactions of weakly-bound nuclei and appears as a strong coupling effect between elastic and breakup channels. Since 6He is a Borromean nucleus in which no binary subsystem is bound, only a four-body channel (6He + T → n + n + α + T) exists as a breakup channel. This property makes four-body dynamics relatively simpler and this is the reason why four-body CDCC was first applied to 6He scattering [4, 5]. A four-body channel (6Li + T → n + p + α + T) and a three-body channel (6Li + T → d + α + T) exists in its breakup channel This situation makes it more difficult to understand four-body dynamics of 6Li scattering
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