Speaker
Dr
Emilio Andrea Maugeri
(Paul Scherrer Institut)
Description
Nuclear Physics in Astrophysics 8 template for abstract
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{\small \it Nuclear Physics in Astrophysics 8, NPA8: 18-23 June 2017, Catania, Italy}
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\TITLE{Production and characterization of 7Be targets for neutron cross section measurements }\\[3mm]
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\AUTHORS{E. A. Maugeri$^{1}$, S. Heinitz$^1$, R. Dressler$^1$, D. Schumann$^1$}
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\AFFILIATION{1}{Paul Scherrer Institut, Switzerland}
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\centerline{Contact email: {emilio-andrea.maugeri@psi.ch }}
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This contribution presents the production and the characterization of $^{7}$Be targets used for the measurement of the $^{7}$Be(n,$\alpha$)$^{4}$He and the $^{7}$Be(n, p)$^{7}$Li cross sections in the energy range of interest for the Big-Bang nucleosynthesis.\\
In particular, two targets of 25 GBq and one of 4 GBq of $^{7}$Be were produced via molecular plating and via droplets deposition at PSI-Switzerland. These targets were used for the measurements of the $^{7}$Be(n, $\alpha$)$^{4}$He cross section at n_TOF-CERN-Switzerland and at SARAF-Israel facilities. The thickness and the uniformity of the obtained targets were characterized by measuring the energy degradation of 5.5 MeV alpha particles passing through them. The obtained spectra were then simulated using the advanced alpha-spectroscopy simulation program (AASI) .\\
One target, used to measure the $^{7}$Be(n, p)$^{7}$Li cross section at n_TOF-CERN facility, was obtained via implantation of about one GBq of chemically and isotopically pure $^{7}$Be ions into a thin aluminium disk. The implantation was carried out at the ISOLDE facility at CERN. After the measurement of the cross sections, the $^{7}$Be activity in the target and its spatial distribution were measured at PSI-Switzerland.
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Primary author
Dr
Emilio Andrea Maugeri
(Paul Scherrer Institut)
Co-authors
Dr
Heinitz Stephan
(Paul Scherrer Institut)
Dr
Maria Dorothea Schumann
(Paul Scherrer Institut)
Rugard Dressler
(Paul Scherrer Institut)
