Bulletin of the American Physical Society
5th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Volume 63, Number 12
Tuesday–Saturday, October 23–27, 2018; Waikoloa, Hawaii
Session MD: Light Elements in Nuclear Astrophysics
2:00 PM–4:30 PM,
Saturday, October 27, 2018
Hilton
Room: Kohala 3
Chair: Carl Brune, Ohio University
Abstract ID: BAPS.2018.HAW.MD.3
Abstract: MD.00003 : Newly measured 7Be+n reaction cross sections and resonance study for the BBN*
2:30 PM–2:45 PM
Presenter:
Seiya Hayakawa
(CNS, the University of Tokyo)
Authors:
Seiya Hayakawa
(CNS, the University of Tokyo)
Keijiro Abe
(CNS, the University of Tokyo)
Marco La Cognata
(INFN-LNS)
Livio Lamia
(INFN-LNS)
Hideki Shimizu
(CNS, the University of Tokyo)
Lei Yang
(CNS, the University of Tokyo)
Hidetoshi Yamaguchi
(CNS, the University of Tokyo)
for the CRIB-THM collaboration
(CNS, INFN-LNS, et al.)
The cosmological 7Li problem is still an open question although several solutions have been proposed for years. Since the primordial 7Li abundance strongly depends on the 7Be production and destruction rate during the Big-Bang nucleosynthesis (BBN), those of the main destruction processes 7Be(n,p)7Li and 7Be(n,α)4He need to be determined. In spite of several recent experimental efforts, there are still some uncertainties at the most relevant energies.
We have performed indirect measurements of both of these reactions by the Trojan Horse Method (THM). The experiments were performed both at the EXOTIC, INFN-LNL, and at the Center-for-Nuclear-Study Radioactive Ion Beam (CRIB) separator in collaboration. We will present the results of the latter experiment.
We observed both the 7Be(d,7Lip)1H and 7Be(d,αα)1H reactions in inverse kinematics by a single measurement, approaching the 7Be(n,p)7Li and 7Be(n,α)4He reactions in quasi-free kinematics, respectively. The (n,p1) yields were successfully extracted for the first time in the relevant energy region. We will discuss the normalization of the present THM cross sections for the (n,p0), (n,p1) and (n,α) by multichannel R-matrix analysis, and possible astrophysical implications.
*This work was supported by JSPS KAKENHI Grant No. 15K17631.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.HAW.MD.3
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