Gamma-Radiation from Light Nuclei under Proton Bombardment

Measurement of theF19(p,γ)Couture1, Beard2, Couder3 et al. 2008Phys. Rev. C263130View full textAdd to dashboardCite

“…Because neither previous measurements of this reaction nor the references that were used for calibration [23][24][25] provide uncertainties, it is not possible to determine the systematic uncertainty of these measurements. Although careful measurements have been made of several of the resonances [26][27][28], including some that were designed to place certain resonances on a sufficiently firm footing to use them as standards [29], no recent simultaneous measurements of multiple reaction channels have been made. As a result, a perusal of the the typical compilations reveals that there are significant discrepancies in the total and partial widths of the states [13,30].…”

Calculation of the 13N(p, ?)14O Cross Section at Low Energies

“…Their discussion, however, does not help to clarify the situation. Of the thin-target high-resolution measurements that they claim all give r~ = 0·62-0·67 eV, Fowler and Lauritsen (1949) gave r~(1ab) = 0·63 eV corresponding to r; = 0·58 eV; Hunt and Jones (1953) did not make an absolute measurement and so gave no value of r;; Hebbard and Vogi (1960) and Vogi (1963) normalized their measurements to cr peak = 127 JLb as measured by Seagrave (1951Seagrave ( , 1952, so that the value of 130·0 JLb that Vogi gave for the cross section at a single energy should not be regarded as an independent absolute t Actually the cross section given by Langanke et al (1985), with a resonance S factor of 0·88 MeVb at Er = 0·547 MeV and a total width of ro = 40·1 keY, corresponds to ~ == 1·96 eV [from ~ = 5.55x10-5 roS(E r ) MeV-1 b-1 ]. Also Chupp et al (1985) …”

“…The value of ro(14N; 1-) given by Ajzenberg-Selove (1981) is 30+1 keY, which comes solely from the value I1ab = 32·5±1 keY measured by Seagrave (1952). Other values of I1ab are -40 keY (Fowler et al 1948;Fowler and Lauritsen 1949), 36 keY (given by Kashy et al 1961 from analysis of the data of Milne 1954) and 37 keY (Vogl 1963). An error of ±0·6 keY may be assigned to YogI's value corresponding to the error of ± 10 keY that he ascribes to the reduced width ')'2 = 570 keY.…”

Réalisation d'un dispositif expérimental pour l'étude des réactions de captures radiatives induites sur le lithium

“…La conservation de l'épaisseur de la cible, soumise à l'action du faisceau, nous a amenés à concevoir L'étalonnage de ce dispositif d'évaporation a été fait en mesurant l'épaisseur des dépôts de lithium à l'aide de la résonance 'Li(p, y)'Be à 440 keV d'énergie incidente [1].…”