A method for investigation of the $D(^{4}He, \gamma)^{6}Li$ reaction in the Ultralow energy region under a high background
PBN-AR
Instytucja
Wydział Energetyki i Paliw (Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie)
Informacje podstawowe
Główny język publikacji
EN
Czasopismo
Nuclear Instruments & Methods in Physics Research. Section A, Accelerators Spectrometers, Detectors and Associated Equipment
ISSN
0168-9002
EISSN
1872-9576
Wydawca
Elsevier Science BV
DOI
Rok publikacji
2016
Numer zeszytu
Strony od-do
24--30
Numer tomu
825
Link do pełnego tekstu
Identyfikator DOI
Liczba arkuszy
0.4
Autorzy
(liczba autorów: 11)
Pozostali autorzy
+ 10
Słowa kluczowe
EN
gamma spectroscopy
nuclear reaction
lithium problem in astrophysics
targets
cross sections
gamma detectors
Streszczenia
Język
EN
Treść
The cosmological lithium problem, that is, a noticeable discrepancy between the predicted and observed abundances of lithium, is in conflict with the Standard Big Bang Nucleosynthesis model. For example, the abundance of 7Li is 2–4 times smaller than predicted by the Standard Big Bang Nucleosynthesis. As to the abundance of 6Li, recent more accurate optical investigations have yielded only the upper limit on the 6Li/7Li ratio, which makes the problem of 6Li abundance and accordingly of disagreement with the Standard Big Bang Nucleosynthesis predictions less acute. However, experimental study of the D(4He, γ)6Li reaction cross section is still of current importance because there is a theoretical approach predicting its anomalously large value in the region of energies below the Standard Big Bang Nucleosynthesis energy. The work is dedicated to the measurement of the cross section for the D(4He, γ)6Li reaction proceeding in zirconium deuteride at the incident 4He+ion energy of 36 keV. The experiment is performed at a pulsed Hall plasma accelerator with an energy spread of 20% FWHM. A method for direct measurement of the background from the reaction chain D(4He, 4He)D→D(D, n)3He→(n, γ) and/or (n, n′γ) ending with activation of the surrounding material by neutrons is proposed and implemented in the work. An upper limit on the D(4He, γ)6Li reaction cross section σ≤7·10−36 cm2 at the 90% confidence level is obtained.
Cechy publikacji
original article
peer-reviewed
Inne
System-identifier
idp:103277
CrossrefMetadata from Crossref logo
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