7Be(n,p)7Li Reaction and the Cosmological Lithium Problem: Measurement of the Cross Section in a Wide Energy Range at n_TOF at CERN
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Damone, L; Barbagallo, M; Mastromarco, M.; Mengoni, A.; Cosentino, L; Maugeri, E; Heinitz, S; Schumann, D.; Dressler, R.; Kappeler, F; Wallner, Anton
Description
We report on the measurement of the 7Be(n,p)7 Li cross section from thermal to approximately 325 keV neutron energy, performed in the high-flux experimental area (EAR2) of the n_TOF facility at CERN. This reaction plays a key role in the lithium yield of the big bang nucleosynthesis (BBN) for standard cosmology. The only two previous time-of-flight measurements performed on this reaction did not cover the energy window of interest for BBN, and they showed a large discrepancy between each other....[Show more]
dc.contributor.author | Damone, L | |
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dc.contributor.author | Barbagallo, M | |
dc.contributor.author | Mastromarco, M. | |
dc.contributor.author | Mengoni, A. | |
dc.contributor.author | Cosentino, L | |
dc.contributor.author | Maugeri, E | |
dc.contributor.author | Heinitz, S | |
dc.contributor.author | Schumann, D. | |
dc.contributor.author | Dressler, R. | |
dc.contributor.author | Kappeler, F | |
dc.contributor.author | Wallner, Anton | |
dc.date.accessioned | 2020-05-12T03:46:11Z | |
dc.date.available | 2020-05-12T03:46:11Z | |
dc.identifier.issn | 0031-9007 | |
dc.identifier.uri | http://hdl.handle.net/1885/204051 | |
dc.description.abstract | We report on the measurement of the 7Be(n,p)7 Li cross section from thermal to approximately 325 keV neutron energy, performed in the high-flux experimental area (EAR2) of the n_TOF facility at CERN. This reaction plays a key role in the lithium yield of the big bang nucleosynthesis (BBN) for standard cosmology. The only two previous time-of-flight measurements performed on this reaction did not cover the energy window of interest for BBN, and they showed a large discrepancy between each other. The measurement was performed with a Si telescope and a high-purity sample produced by implantation of a 7Be(n,p)7 ion beam at the ISOLDE facility at CERN. While a significantly higher cross section is found at low energy, relative to current evaluations, in the region of BBN interest, the present results are consistent with the values inferred from the time-reversal 7Be(n,p)7 Li reaction, thus yielding only a relatively minor improvement on the so-called cosmological lithium problem. The relevance of these results on the near-threshold neutron production in the p+7 Li reaction is also discussed. | |
dc.description.sponsorship | This research was partially funded by the European Atomic Energy Community (Euratom) Seventh Framework Programme No. FP7/2007-2011 under Project CHANDA (Grant No. 605203). We acknowledge the support by the Narodowe Centrum Nauki (NCN), under Grant No. UMO-2016/22/M/ST2/00183. | |
dc.format.mimetype | application/pdf | |
dc.language.iso | en_AU | |
dc.publisher | American Physical Society | |
dc.rights | © 2018 | |
dc.rights.uri | http://creativecommons.org/licenses/by/4.0/ | |
dc.source | Physical Review Letters | |
dc.title | 7Be(n,p)7Li Reaction and the Cosmological Lithium Problem: Measurement of the Cross Section in a Wide Energy Range at n_TOF at CERN | |
dc.type | Journal article | |
local.description.notes | Imported from ARIES | |
local.identifier.citationvolume | 121 | |
dc.date.issued | 2018 | |
local.identifier.absfor | 020202 - Nuclear Physics | |
local.identifier.ariespublication | u9912193xPUB468 | |
local.publisher.url | https://www.aps.org/ | |
local.type.status | Published Version | |
local.contributor.affiliation | Damone, L, Istituto Nazionale di Fisica Nucleare | |
local.contributor.affiliation | Barbagallo, M, Istituto Nazionale di Fisica Nucleare | |
local.contributor.affiliation | Mastromarco, M., Istituto Nazionale di Fisica Nucleare | |
local.contributor.affiliation | Mengoni, A., ENEA | |
local.contributor.affiliation | Cosentino, L, Istituto Nazionale di Fisica Nucleare | |
local.contributor.affiliation | Maugeri, E, Paul Scherrer Institut | |
local.contributor.affiliation | Heinitz, S, Paul Scherrer Institut, Villigen PSI | |
local.contributor.affiliation | Schumann, D., Paul Scherrer Institute | |
local.contributor.affiliation | Dressler, R., Paul Scherrer Institute | |
local.contributor.affiliation | Kappeler, F, Karlsruhe Institute of Technology | |
local.contributor.affiliation | Wallner, Anton, College of Science, ANU | |
local.bibliographicCitation.issue | 042701 | |
local.bibliographicCitation.startpage | 1 | |
local.bibliographicCitation.lastpage | 7 | |
local.identifier.doi | 10.1103/PhysRevLett.121.042701 | |
local.identifier.absseo | 970102 - Expanding Knowledge in the Physical Sciences | |
dc.date.updated | 2019-11-25T08:10:14Z | |
local.identifier.scopusID | 2-s2.0-85050773670 | |
local.identifier.thomsonID | WOS:000439547100004 | |
dcterms.accessRights | Open Access | |
dc.provenance | Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. | |
dc.rights.license | Creative Commons Attribution 4.0 International license | |
Collections | ANU Research Publications |
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