Speaker
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\newcommand {\lip} {\mbox{$^{8}{\rm Li}+p$}}
\newcommand {\lipp} {\mbox{$^{8}{\rm Li}(p,p)^{8}$Li}}
\newcommand {\lipd} {\mbox{$^{8}{\rm Li}(p,d)^{7}$Li}}
\newcommand {\lidp} {\mbox{$^{7}{\rm Li}(d,p)^{8}$Li}}
\newcommand {\lipa} {\mbox{$^{8}$Li($p,\alpha)^{5}$He}}
\newcommand {\bepg} {\mbox{$^{7}$Be($p,\gamma)^{8}$B}}
\newcommand {\liddp} {\mbox{$^{7}{\rm Li}(d,d')^{7}$Li$^{*}$}}
\newcommand {\be} {\mbox{$^{9}$Be}}
\newcommand {\li} {\mbox{$^{8}$Li}}
\newcommand {\lid} {\mbox{$^{7}{\rm Li}+d$}}
\newcommand {\liexcd} {\mbox{$^{7}{\rm Li}^*+ d$}}
\begin{document}
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\noindent{\underline{The 12th International Conference on Nucleus-Nucleus Collisions, June 21-26, 2015, Catania, Italy}}
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\begin{center}
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{\large \bf Evidence for a four-body state in $\be$ through the $\lipd$ reaction}
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E. Leistenschneider$^1$, \underline{A. L\'{e}pine-Szily}$^1$, P. Descouvemont$^2$, D. R. Mendes Jr$^3$,
R. Lichtenth\"aler$^1$, R. Pampa Condori$^1$, P. N. de Faria$^1$, V. Guimar\~aes$^1$, V. Scarduelli$^1$, E. L. A. Macchione$^1$, V. A. P. Aguiar$^1$,
J. Duarte$^1$, K. C. C. Pires$^1$, V. Morcelle$^4$, M. C. Morais$^5$, V. A. Zagatto$^{1,6}$, M. Assun\c{c}\~{a}o$^7$, T. Britos$^7$
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{\em $^1$ Instituto de F\'{\i}sica
da Universidade de S\~{a}o Paulo,
Caixa Postal 66318, 05315-970, S\~{a}o Paulo, SP, Brazil} \
{\em $^2$ Physique Nucl\'eaire Th\'eorique et Physique Math\'ematique, C.P. 229,\
Universit\'e Libre de Bruxelles (ULB), B 1050 Brussels, Belgium}\
{\em $^3$ Instituto de F\'{\i}sica, Universidade Federal Fluminense, Avenida Litoranea s/n, Gragoat\'a, Niter\'oi RJ 24210-340, Brazil}\
{\em $^4$ Universidade Federal Rural de Rio de Janeiro
Rodovia BR 465 - Km 7 - Campus Universit\'ario - Zona Rural, Serop\'edica - RJ, Brazil}\
{\em $^5$ CEFET/RJ- Campus Petropolis, Rua do imperador, 971, Centro, 25652-003, Petropolis, RJ}\
{\em $^6$ Centro Universitario FIEO-UNIFIEO, Osasco, SP, Brazil}\
{\em $^7$ Departamento de Ci\^encias Exatas e da Terra, Universidade Federal de S\~{a}o Paulo, Campus Diadema,
S\~{a}o Paulo, Brazil}\
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We report on a simultaneous study of the $(p,p)$, $(p,\alpha)$ and $(p,d)$ reactions on $\li$ at low energies [1]. The
experiment was performed using a thick hydrogen target and a radioactive $\li$ beam available at the RIBRAS facility
of S\~{a}o Paulo [2]. This experiment represents an upgrade of a previous experiment [3], where only the $\lipa$ cross
section was measured. A comparison
with previous direct $\lidp$ data suggests a newly observed $\be$ resonance around $E_x=18.67$ MeV with a
large $^{7}{\rm Li}^{\star}+d$ component. The
properties of this resonance are determined by a $R$-matrix analysis [4], which provides evidence for a significant clustering.
As the $^{7}{\rm Li}^{\star}$ nucleus and the deuteron present a strong deformation, this $\be$ state can be
interpreted as a
four-body resonance. We suggest that it could be also observed in $\liddp$ inelastic scattering.
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[1] E. Leistenschneider \emph{et al.}, to be published\
[2] D. R. Mendes \emph{et al.}, Phys. Rev. C {\bf 86}, 064321 (2012)\
[3] A.~L\'epine-Szily, R.~Lichtenth\"aler, V.~Guimar\~aes, Eur. Phys. J. A {\bf 50}, 128 (2014) \
[4] P. Descouvemont and D. Baye, Rep. Prog. Phys. {\bf 73}, 036301 (2010)
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