On the Stripping of Two Nucleons

Newns, H C

doi:10.1088/0370-1328/76/4/305

Cited by 50 publications

(8 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It should be noted that Pellegrini 22 has shown that within the Butler formalism 23 the plane-wave theoretical descriptions of the knockout and deuteron pickup process are almost identical. Furthermore, if the finite size of the incident and exit particles are neglected, then both the knockout 24 and two-nucleon pickup models 18 predict cross sections which are proportional to a sum of spherical Bessel functions. The arguments of the Bessel functions are slightly different in the two cases, but can be made the same by using a slightly larger interaction radius for the knockout case.…”

Section: A Generalmentioning

confidence: 99%

“…The solid line was required to pass through the origin and was least-squares fitted to all the points represented by the solid circles. e.g., Newns' description of two-nucleon pickup, 18 yield expressions for the cross section involving a (27+1) factor. In view of the complexity of these latter expressions, it can be reasonably argued that the simple (27+1) dependence of the DI mechanism could be obscured by fluctuations arising from the complex dependence of the other factors on energy and angular momentum.…”

Section: The (27+1) Rulementioning

confidence: 99%

See 1 more Smart Citation

F19(d, α)O17Reaction at 9.2 MeV

1965

View full text Add to dashboard Cite

The differential cross sections for the F l9 (d,a)0 17 reaction which leave O 17 in its ground and lowest four excited states have been measured using silicon surface-barrier detectors. Thin Teflon targets (370 to 720 jug/cm 2 )were bombarded with 9.2-MeV deuterons and alpha spectra were obtained at 46 laboratory angles between 10 and 172.5°. The five angular distributions exhibited forward and backward peaking, an over-all oscillatory structure, and minima whose magnitudes differ significantly from zero. The angular distributions are analyzed in terms of an expression which is the sum of an isotropic term and one which arises from the simultaneous action of two-nucleon pickup and heavy-par tide stripping (HPS) mechanisms. Good fits are obtained for theao, on, andau distributions, but only the gross features of thea?i and as distributions could be fitted. A discussion regarding the identification of either the pickup or the knockout mechanism as the dominant forward-angle direct-interaction process for (d,a) reactions in light nuclei is presented. It is concluded that the experimental angular distributions are fitted equally well irrespective of which one is assumed to act along with HPS. An interpretation of the differential cross sections is made which is based on the speculation that direct-interaction and statistical compound-nucleus (SCN) processes contribute incoherently. A method for the decomposition of the cross section is proposed in which the SCN contribution is assumed to be isotropic. The integrated SCN component of the cross sections is shown to be closely proportional to 2/-f-l.

show abstract

Section: A Generalmentioning

confidence: 99%

Section: The (27+1) Rulementioning

confidence: 99%

F19(d, α)O17Reaction at 9.2 MeV

1965

View full text Add to dashboard Cite

show abstract

“…The presence of the 1.25-MeV gamma ray is in agreement with the observations of the 7.34 • -> 6.09 transition reported by Lacambra et al 2 and by Carlson. 5 In order to obtain the relative intensities of the 0.62-, 1.25-, and 7.34-MeV gamma rays, the 7.34-MeV fullenergy-loss peak was corrected for contributions due to chance coincidences and due to the simultaneous entry into the crystal of the 0.62-and 6.72-MeV gamma rays and the 1.25-and 6.09-MeV gamma rays. Chance co- incidences were determined by making use of the realto-random ratio and by fitting the direct gamma-ray spectrum to points beyond the 7.34-MeV full-energyloss peak.…”

Section: Resultsmentioning

confidence: 99%

“…2,5 Multipolarity measurements have been made on the ground-state transitions from the 6.72-and 7.34-MeV states and Doppler-shift data are presented on various transitions from all of the states studied.…”

mentioning

confidence: 99%

Properties of Excited States inC14

Alburger

Gallmann²,

Nelson³

et al. 1966

Phys. Rev.

View full text Add to dashboard Cite

“…On the other hand the two-nucleon stripping mechanisms considered by EL-NADI [6], NEWl~S [7] and GLE~DE~I~ING [8] seem to gire reliable fitting with the experimental data, when the projectile energy is above the Coulomb barrier.…”

Section: Introductionmentioning

confidence: 99%