Speaker
Dr
Seiya Hayakawa
(Center for Nuclear Study, University of Tokyo)
Description
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%-------- aliases --------%
\newcommand{\benpli}{$^{7}$Be$(n,p)^{7}$Li}
\newcommand{\benaa}{$^{7}$Be$(n,\alpha)^{4}$He}
\newcommand{\bedlipp}{$^{7}$Be$(d,^{7}$Li$p)^1$H}
\newcommand{\bedaap}{$^{7}$Be$(d,\alpha \alpha)^1$H}
\newcommand{\bedpbe}{$^{7}$Be$(d,p)^8$Be}
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\begin{document}
{\small \it Nuclear Physics in Astrophysics 8, NPA8: 18-23 June 2017, Catania, Italy}
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%%% Title goes here.
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\TITLE{Measurements of the $^7$Be+$n$ Big-Bang nucleosynthesis reactions
at CRIB by the Trojan Horse method}\\[3mm]
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%%% Authors and affiliations are next. The presenter should be
%%% underlined as shown below.
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\AUTHORS{
S.~Hayakawa$^{1}$,
K.~Abe$^{1}$,
O.~Beliuskina$^{1}$,
S.~M.~Cha$^{2}$,
K.~Y.~Chae$^{2}$,
S.~Cherubini$^{3,4}$,
P.~Figuera$^{3,4}$,
Z.~Ge$^{5}$,
M.~Gulino$^{3,6}$,
J.~Hu$^{7}$,
A.~Inoue$^{8}$,
N.~Iwasa$^{9}$,
D.~Kahl$^{10}$,
A.~Kim$^{11}$,
D.~H.~Kim$^{11}$,
G.~Kiss$^{5}$,
S.~Kubono$^{1,5,7}$,
M.~La~Cognata$^{3}$,
M.~La~Commara$^{12,13}$,
L.~Lamia$^{4}$,
M.~Lattuada$^{3,4}$,
E.~J.~Lee$^{2}$,
J.~Y.~Moon$^{14}$,
S.~Palmerini$^{15,16}$,
C.~Parascandolo$^{13}$,
S.~Y.~Park$^{11}$,
D.~Pierroutsakou$^{13}$,
R.~G.~Pizzone$^{3,4}$,
G.~G.~Rapisarda$^{3}$,
S.~Romano$^{3,4}$,
H.~Shimizu$^{1}$,
C.~Spitaleri$^{3,4}$,
X.~D.~Tang$^{7}$,
O.~Trippella$^{15,16}$,
A.~Tumino$^{3,6}$,
P.~Vi$^{5}$,
H.~Yamaguchi$^{1}$,
L.~Yang$^{1}$,
and
N.~T.~Zhang$^{7}$
}
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{\small \it
\AFFILIATION{1}{Center for Nuclear Study, University of Tokyo, Wako, Japan}
\AFFILIATION{2}{Department of Physics, Sungkyunkwan University, Suwon,
Republic of Korea}
\AFFILIATION{3}{Istituto Nazionale di Fisica Nucleare - Laboratori
Nazionali del Sud, Catania, Italy}
\AFFILIATION{4}{Department of Physics and Astronomy, University of
Catania, Catania, Italy}
\AFFILIATION{5}{RIKEN Nishina Center, Wako, Japan}
\AFFILIATION{6}{Faculty of Engineering and Architecture,
Kore University of Enna, Enna, Italy}
\AFFILIATION{7}{Institute of Modern Physics, Chinese Academy of Sciences,
Lanzhou, China}
\AFFILIATION{8}{Research Center for Nuclear Physics, Osaka University,
Ibaraki, Japan}
\AFFILIATION{9}{Department of Physics, Tohoku University, Sendai, Japan}
\AFFILIATION{10}{School of Physics and Astronomy, University of
Edinburgh, Edinburgh, Japan}
\AFFILIATION{11}{Department of Physics, Ewha Womans University, Seoul,
Republic of Korea}
\AFFILIATION{12}{Department of Physics 'E. Pancini', University of Naples Federico II, Naples, Italy}
\AFFILIATION{13}{Istituto Nazionale di Fisica Nucleare - Section of
Naples, Naples, Italy}
\AFFILIATION{14}{High Energy Accelerator Research Organization (KEK),
Wako, Japan}
\AFFILIATION{15}{Istituto Nazionale di Fisica Nucleare - Section of
Perugia, Perugia, Italy}
\AFFILIATION{16}{Department of Physics and Geology, University of
Perugia, Perugia, Italy}
}
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\centerline{Contact email: {\it hayakawa@cns.s.u-tokyo.ac.jp}}
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%%% Abstract proper starts here.
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It has been known that
the prediction of the primordial $^7$Li abundance by the
standard Big-Bang Nucleosynthesis (BBN) model %\cite{Coc2014}
is about 3 times larger than the observation,
so called the cosmological $^7$Li problem.
%
The $^7$Li abundance strongly depends on the $^{7}$Be production.
%
The \benpli\ reaction is considered as the main process to destroy
$^7$Be during the BBN.
%
Although its resonance structure has been well investigated,
%\cite{Adahchour2003},
the contribution of the transition to the first excited state
of $^7$Li at the BBN energies ($\sim25$~keV--1 MeV)
has never been discussed.
%
The \benaa\ reaction might be the second important $^7$Be destroyer,
but its experimental reaction rate has not been investigated until
the recent studies, %\cite{Hou2015,Barbagallo2016},
which yet involve uncertainty in the BBN energy region.
%
We performed indirect measurements %of the \benpli\ and \benaa\ reactions
of these reactions simultaneously %at once
by the Trojan Horse Method (THM) at %\cite{Spitaleri2011} at
Center for Nuclear Study Radioactive Ion Beam (CRIB) separator.
%\cite{Yanagisawa2005}.
%
This study is one of the first attempts
to apply the THM to RI$+n$ reactions
together with a recent collaborating study led by L.~Lamia
and the INFN-LNS nuclear astrophysics group.
%\cite{Lamia} in collaboration.
%
The experimental setup consisted of
two parallel-plate avalanche counters to track the $^7$Be RI beam,
a CD$_2$ target, and six $\Delta E$-$E$ position-sensitive silicon telescopes
to observe the \bedlipp\ and \bedaap\ reactions
in inverse kinematics,
which allows us to approach the \benpli\ and \benaa\ reactions
in quasi-free kinematics, respectively.
%
We aimed to resolve both the ground and the first excited states
of $^7$Li by $Q$-value spectrum of the 3-body reactions for the first time.
%
We observed several thousands of valid events in quasi-free kinematics.
%
Some results including the $Q$-value spectrum,
the momentum distribution of the spectator,
and the preliminary cross sections
of the \benpli\ and the \benaa\ reactions
will be presented.
%
% \begin{figure}[t!]%fig1
% \begin{center}
% \includegraphics[scale=0.5]{q-value.ps}
% \end{center}
% \caption{$Q$-value spectra of the \bedlipp\ (left) and the \bedaap\ (right) reactions.}
% \label{fig:q-value}
% \vspace{-6mm}
% \end{figure}
%
% \vspace{-24pt}
% \begin{thebibliography}{9}
% \setlength\itemsep{-0.2zh}
% \bibitem{Adahchour2003} A. Adahchour and P. Descouvemont,
% J.~Phys.~G~\textbf{29},~395~(2003);
% %Journal of Physics G: Nuclear and Particle
% %Physics}{29}{2003}{395}.
% %}{}{2016}{arXiv:1606.09420 [nucl-ex]}.
% \bibitem{Hou2015}S. Q. Hou \textit{et al.},
% Phys. Rev. C \textbf{91}, 055802 (2015);
% \bibitem{Barbagallo2016}M. Barbagallo \textit{et al.},
% Phys.~Rev.~Lett.~\textbf{117},~152701~(2016);
% \bibitem{Spitaleri2011}
% % C. Spitaleri, A. M. Mukhamedzhanov,
% % L. D. Blokhintsev, M. La Cognata, R. G. Pizzone and A. Tumino}
% C. Spitaleri \textit{et al.},
% %Physics of Atomic Nuclei}{74}{2011}{1725}.
% Phys. Atom. Nucl. \textbf{74}, 1725 (2011);
% \bibitem{Yanagisawa2005}
% Y.~Yanagisawa~\textit{et~al.},~Nucl.~Instrum.~and~Meth.~A~\textbf{539},~74~(2005);
% % \BY{Y. Yanagisawa, S. Kubono, T. Teranishi,
% % K. Ue, S. Michimasa, M. Notani, J. He, Y. Ohshiro, S. Shimoura,
% % S. Watanabe, N. Yamazaki, H. Iwasaki, S. Kato, T. Kishida,
% % T. Morikawa \atque Y. Mizoi}
% % \IN{Nuclear Instruments and Methods in Physics Research Section
% % A: Accelerators, Spectrometers, Detectors and Associated Equipment}{539}{2005}{74}.
% % \bibitem{Gulino2010}
% % M. Gulino \textit{et al.},
% % J. Phys. G \textbf{37}, 125105 (2010).
% % \bibitem{Gulino2013}
% % M. Gulino \textit{et al.},
% % Phys. Rev. C \textbf{87}, 012801 (2013).
% \bibitem{Lamia}
% L. Lamia \textit{et al.}:
% Proc. 14th International Symposium on Nuclei in the
% Cosmos, JPS Conf. Proc., in publication.
% % \bibitem{Cherubini2015}
% % S. Cherubini \textit{et al.},
% % Phys. Rev. C \textbf{92}, 015805 (2015).
% % \bibitem{Kumagai2001}
% % Kumagai \textit{et al.},
% % Nucl. Instrum. and Meth. A \textbf{470}, 562 (2001).
% % \bibitem{Angulo2005}
% % % C. Angulo, E. Casarejos, M. Couder, P. Demaret, P. Leleux, F. Vanderbist, A. Coc,
% % % J. Kiener, V. Tatischeff, T. Davinson, S. Murphy, N.L. Achouri,
% % % N.A. Orr, D. Cortina-Gil,P. Figuera, B.R. Fulton, I. Mukha, and E. Vangioni}
% % C. Angulo \textit{et al.},
% % %Astrophysical Journal}{630}{2005}{105}.
% % Astrophys. J. \textbf{630}, 105 (2005).
% % \bibitem{1}
% % S. Noh and I. Yamaguchi: Jpn.\ J. Appl.\ Phys.\ \textbf{40}, L1299 (2001).
% \end{thebibliography}
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%%% End of abstract.
%%%
\end{document}
Primary author
Dr
Seiya Hayakawa
(Center for Nuclear Study, University of Tokyo)
Co-authors
Dr
Aram Kim
(Department of Physics, Ewha Womans University)
Dr
Aurora Tumino
(LNS)
Ms
Azusa Inoue
(RCNP, Osaka University)
Claudio Spitaleri
(LNS)
Concetta Parascandolo
(NA)
Ms
Dahee Kim
(Department of Physics, Ewha Womans University)
Dr
David Kahl
(School of Physics and Astronomy, University of Edinburgh)
Dimitra Pierroutsakou
(NA)
Ms
Eunji Lee
(Department of Physics, Sungkyunkwan University)
Gabor Kiss
(RIKEN Nishina Center)
Giuseppe Gabriele Rapisarda
(LNS)
Mr
Hideki Shimizu
(Center for Nuclear Study, University of Tokyo)
Dr
Hidetoshi Yamaguchi
(Center for Nuclear Study, the University of Tokyo)
Dr
Jun Hu
(Institute of Modern Physics, Chinese Academy of Sciences)
Dr
Jun Young Moon
(High Energy Accelerator Research Organization)
Mr
Keijiro Abe
(Center for Nuclear Study, University of Tokyo)
Prof.
Kyungyuk Cha
(Department of Physics, Sungkyunkwan University)
Dr
Lei Yang
(Center for Nuclear Study, University of Tokyo)
Livio Lamia
(LNS)
MARCO SALVATORE La Cognata
(LNS)
Marcello Lattuada
(LNS)
Marco La Commara
(NA)
Marisa Gulino
(LNS)
Prof.
Naohito Iwasa
(Department of Physics, Tohoku University)
Dr
Ningtao Zhang
(Institute of Modern Physics, Chinese Academy of Sciences)
Dr
Olga Beliuskina
(Center for Nuclear Study, University of Tokyo)
Oscar Trippella
(PG)
Dr
Phong Vi
(RIKEN Nishina Center)
Pierpaolo Figuera
(LNS)
Rosario Pizzone
(LNS)
Sara Palmerini
(PG)
Prof.
Shigeru Kubono
(RIKEN Nishina Center)
Silvio Cherubini
(LNS)
Ms
Soomi Cha
(Department of Physics, Sungkyunkwan University)
Stefano Romano
(LNS)
Ms
Suyeon Park
(Department of Physics, Ewha Womans University)
Prof.
Xiaodong Tang
(Institute of Modern Physics, Chinese Academy of Sciences)
Mr
Zhuang Ge
(RIKEN Nishina Center)
