Direct measurement of the absolute cross section of p(Be-7, gamma)B-8

Authors
Terrasi, F Gialanella, L Imbriani, G Strieder, F Campajola, L D'Onofrio, A Greife, U Gyurky, G Lubritto, C Ordine, A Roca, V Rolfs, C Romano, M Rogalla, D Sabbarese, C Somorjai, E Trautvetter, HP
Citation
F. Terrasi et al., Direct measurement of the absolute cross section of p(Be-7, gamma)B-8, NUCL PHYS A, 688(1-2), 2001, pp. 539C-542C
Citations number
21
Categorie Soggetti
Physics
Journal title
NUCLEAR PHYSICS A
ISSN journal
03759474 → ACNP
Volume
688
Issue
1-2
Year of publication
2001
Pages
539C - 542C
Database
ISI
SICI code
0375-9474(20010521)688:1-2<539C:DMOTAC>2.0.ZU;2-5
Abstract
A new direct measurement of the absolute cross section of the 'H(Be-7,gamma )B-8 reaction has been performed in inverse kinematics at E-cm = 990 keV. A radioactive Be-7 beam (E-lab = 8 MeV) and a windowless H-2 gas target were used; B-8 recoils were identified and counted by a recoil mass separator. The reaction cross section was derived by normalization to the elastic scat tering cross section, measured in a separate run. The resulting value sigma (r) = 0.40 +/- 0.12 mub yielded an astrophysical S-factor at zero energy S -0 = 15.3 +/- 4.5 eV b, in fair agreement with recommended values.