Angular distributions of deuterons from 6Li(12C, d)16O∗

Calculation Of The 12C+a Capture Cross Section at Stellar Energies

“…For 1 = 1, this is in agreement with the Caltech phase shift analysis and with the theoretical and stripping estimates of 8; referred to in Section I, and, for l = 3, it agrees with estimates of y~~2 (for a3 = 5 ·43 fm) of 0 ·07-0 ·14 MeV (Stephenson 1966), 0-0 ·014 MeV (Loebenstein et al 1967), and 0·02-0·04 MeV (Piihlhofer et al 1970). The large value of 8; = o· 71 obtained by Clark (1969) for al = 5·3 fm appears to be due partly to his use of a one-level approximation in order to fix the energy of the 7 ·12 MeV level, which is not consistent with the three-level formula used in the remainder of his analysis, but mainly to the fact that his value of 8; is appropriate to Bl = 0; with Bl = BI I ), the corresponding value of 8; is 0·11, giving yg)2 = 0·08 MeV.…”

“…From the 6Li(12C, d) 16 0 reaction Loebenstein et al (1967) obtained e~ = 0 ·06-0 ,14,+ while from 12C(7Li, t) 16 0, Puhlhofer et al (1970) gave e~ = 0·025+ with the suggestion that this may be too low by a factor of 1·5 or 2. Dolinsky, Turovtsev, and Yarmukhamedov (1970) have pointed out some difficulties in obtaining reliable estimates in this way.…”

2+ States of 8Be

“…MeV states of 16 0 by Loebenstein et al (1967) (see also Bethg~ et al 1967;Meier-• Boyarkina (1964) predicts 2+, T = 1 levels for A = 10 at energies 3·4, 5·9, and 8·6 MeV above the lowest T = 1 level, but the calculated expectation value of the energy of the [222]858 state is in error and the third 2+ state should be much higher.…”

Astrophysical Consequences of the Existence of Charged Intermediate Vector Bosons

“…In the present work a calculation of Hayashi, Hoshi, and Sugimoto (1962) on the rates of reactions contributing to L 1 (T) and L 2 (T) has been repeated with different reduced widths for the nuclear reaction (17), and a match between 712 and the result of observations has been found for reduced widths in the range from 0·23 to 0·32. This adjustment is nevertheless not very plausible, because the most recent experimental information about the reduced width (Loebenstein et al 1967) is that it lies between 0·06 and 0·14, in agreement with a detailed theoretical estimate by Stephenson (1966). It may be possible to obtain values inside the experimental range if the square-well potential used by Hayashi, Hoshi, and Sugimoto is replaced by a more realistic optical potential, as is implied by Stephenson and by Vogt, Michaud, and Reeves (1965).…”