Počet záznamů: 1
Study of Neutron Induced Reactions on 7Be Using Large Angle Coincidence Spectroscopy
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SYSNO ASEP 0457901 Druh ASEP C - Konferenční příspěvek (mezinárodní konf.) Zařazení RIV D - Článek ve sborníku Název Study of Neutron Induced Reactions on 7Be Using Large Angle Coincidence Spectroscopy Tvůrce(i) Vacík, Jiří (UJF-V) RID, ORCID, SAI
Hnatowicz, Vladimír (UJF-V) RID
Koster, U. (FR)Celkový počet autorů 3 Zdroj.dok. Physics Procedia, The 23rd International Conference on the Application of Accelerators in Research and Industry - CAARI 2014, 66. - San Antonio : Elsevier, 2015 - ISSN 1875-3892 Rozsah stran s. 520-523 Poč.str. 4 s. Forma vydání Tištěná - P Akce 23rd International Conference on the Application of Accelerators in Research and Industry (CAARI) Datum konání 25.05.2014 - 30.05.2014 Místo konání San Antonio Země US - Spojené státy americké Typ akce WRD Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova radioactive nuclei ; Berylium ; thermal neutrons ; coincidence spectroscopy Vědní obor RIV BG - Jaderná, atomová a mol. fyzika, urychlovače CEP LM2011019 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy GBP108/12/G108 GA ČR - Grantová agentura ČR Institucionální podpora UJF-V - RVO:61389005 UT WOS 000380585500066 DOI 10.1016/j.phpro.2015.05.068 Anotace Neutron induced reactions on the radioactive nuclei 7Be represent a unique tool for study of the 8Be nuclear structure in the high-energy region. The interactions of thermal neutrons with 7Be is dominated by the strong 7Be(nth,p)7Li reactions. While 8Be in the ground state disintegrates rapidly into two α particles, the alpha decay from the 2- neutron capture state is prohibited because of the parity violation. The study of the 7Be(nth,α)4He reaction (with two 9496 keV α particles) is then a unique tool to study parity violation in strong interactions. The test was carried out on the collimated thermal neutron beam at NPI Rez using the large angle coincidence spectroscopy. The 7Be nuclei were prepared at the ISOLDE facility by implantation of the 60 keV 7Be ions into 5 μm Al foil. The results showed that the ratio of the cross sections is σ(p1)/σ(p0) = (1.58 ± 0.06) x 10-2, and in the coincidence measurement simultaneous emission of two 8775 keV α particles is observed. This reaction channel corresponds to a two-stage process comprising transition from the neutron capture state (18991 keV) to an intermediate state by emission of γ photon that is followed by the decay into two alphas. The intermediate state in the highly excited 8Be nuclei is the level at 17640 keV (1+), which is in contrast to the previous reported data. In the experiment no α particles with the energy 9495 keV were observed. Pracoviště Ústav jaderné fyziky Kontakt Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228 Rok sběru 2016
Počet záznamů: 1