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7Be(n, α)4He Reaction and the Cosmological Lithium Problem: Measurement of the Cross Section in a Wide Energy Range at n_TOF at CERN
Physical Review Letters, 117 (2016), 15; 152701. https://doi.org/10.1103/PhysRevLett.117.152701
(n_TOF Collaboration) Barbagallo, M.; ...; Bosnar, Damir; ...; Žugec, Petar

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Barbagallo, M., Bosnar, D. i Žugec, P. (2016). 7Be(n, α)4He Reaction and the Cosmological Lithium Problem: Measurement of the Cross Section in a Wide Energy Range at n_TOF at CERN. Physical Review Letters, 117. (15). doi: 10.1103/PhysRevLett.117.152701

Barbagallo, M., et al. "7Be(n, α)4He Reaction and the Cosmological Lithium Problem: Measurement of the Cross Section in a Wide Energy Range at n_TOF at CERN." Physical Review Letters, vol. 117, br. 15, 2016. https://doi.org/10.1103/PhysRevLett.117.152701

Barbagallo, M., Damir Bosnar i Petar Žugec. "7Be(n, α)4He Reaction and the Cosmological Lithium Problem: Measurement of the Cross Section in a Wide Energy Range at n_TOF at CERN." Physical Review Letters 117, br. 15 (2016). https://doi.org/10.1103/PhysRevLett.117.152701

Barbagallo, M., Bosnar, D. i Žugec, P. (2016) '7Be(n, α)4He Reaction and the Cosmological Lithium Problem: Measurement of the Cross Section in a Wide Energy Range at n_TOF at CERN', Physical Review Letters, 117(15). doi: 10.1103/PhysRevLett.117.152701

Barbagallo M, Bosnar D, Žugec P. 7Be(n, α)4He Reaction and the Cosmological Lithium Problem: Measurement of the Cross Section in a Wide Energy Range at n_TOF at CERN. Physical Review Letters [Internet]. 2016. [pristupljeno 03.12.2024.];117(15). doi: 10.1103/PhysRevLett.117.152701

M. Barbagallo, D. Bosnar i P. Žugec, "7Be(n, α)4He Reaction and the Cosmological Lithium Problem: Measurement of the Cross Section in a Wide Energy Range at n_TOF at CERN", Physical Review Letters, vol. 117, br. 15, 2016. [Online]. Dostupno na: https://urn.nsk.hr/urn:nbn:hr:217:940116. [Citirano: 03.12.2024.]

Za citiranje koristite ovu mrežnu adresu: https://urn.nsk.hr/urn:nbn:hr:217:940116
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Naslov (engleski)7Be(n, α)4He Reaction and the Cosmological Lithium Problem: Measurement of the Cross Section in a Wide Energy Range at n_TOF at CERN
AutorM. Barbagallo
Autor
...
AutorDamir Bosnar
MBZ: 134936
Autor
...
AutorPetar Žugec
MBZ: 326085
Kolaboracijan_TOF Collaboration
Autorova ustanovaSveučilište u Zagrebu
Prirodoslovno-matematički fakultet
(Fizički odsjek)
Znanstveno / umjetničko
područje, polje i grana		PRIRODNE ZNANOSTI
Fizika
Sažetak (engleski)
The energy-dependent cross section of the 7Be(n, α)4He reaction, of interest for the so-called cosmological lithium problem in big bang nucleosynthesis, has been measured for the first time from 10 meV to 10 keV neutron energy. The challenges posed by the short half-life of 7Be and by the low reaction cross section have been overcome at n_TOF thanks to an unprecedented combination of the extremely high luminosity and good resolution of the neutron beam in the new experimental area (EAR2) of the n_TOF facility at CERN, the availability of a sufficient amount of chemically pure 7Be, and a specifically designed experimental setup. Coincidences between the two alpha particles have been recorded in two Si-7Be-Si arrays placed directly in the neutron beam. The present results are consistent, at thermal neutron energy, with the only previous measurement performed in the 1960s at a nuclear reactor. The energy dependence reported here clearly indicates the inadequacy of the cross section estimates currently used in BBN calculations. Although new measurements at higher neutron energy may still be needed, the n_TOF results hint at a minor role of this reaction in BBN, leaving the long-standing cosmological lithium problem unsolved.
Ključne riječi (engleski)
Jezikengleski
Vrsta publikacijeZnanstveni rad - Izvorni znanstveni rad
Status objaveObjavljen
Vrsta recenzijeRecenziran - međunarodna recenzija
Verzija publikacijeObjavljena verzija rada (izdavačev PDF)
Naslov časopisaPhysical Review Letters
Brojčani podacivol. 117, br. 15, 152701
p-ISSN0031-9007
DOIhttps://doi.org/10.1103/PhysRevLett.117.152701
URN:NBNurn:nbn:hr:217:940116
Datum objave publikacije2016
ProjektŠifra: IP-2013-11-1680
Naziv (hrvatski): Precizna mjerenja svojstava hadronskih sustava i niskoenergijska QCD
Kratica: PExpQCD
Voditelj: Damir Bosnar
Pravna nadležnost: Hrvatska
Financijer: HRZZ
Linija financiranja: IP
URL dokumentahttps://journals.aps.org/prl/abstract/10.1103/PhysRevLett.117.152701
Vrsta resursaTekst
Prava pristupaOtvoreni pristup
Uvjeti korištenjaIkona licence Imenovanje 3.0 (CC BY 3.0)
Javna napomena© 2016 American Physical Society. This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Received 22 June 2016; revised manuscript received 12 August 2016; published 3 October 2016.
Datum i vrijeme pohrane2020-02-23 19:56:33