Si28(d, He3

Abstract

The level structure of 27 A1 from 0-to 6.5-MeV excitation has been studied with the 28 Si (i, 3 He) 27 Al reaction at £d=34.4 MeV. Eight experimental angular distributions are presented. Assignments of / values and spectroscopic factors are made with a local, zero-range distorted-wave Born-approximation analysis. The deduced I values are consistent with the known spins of levels of 27 A1 of excitation energy < 3.0 MeV. Levels at 4.05-and 5.15-MeV excitation are assigned 1=1, and the level at 4.40-MeV excitation is assigned 1-2. The extracted spectroscopic factors are discussed in terms of some simple models for 27 A1 and compared with results from new shell-model calculations.

Transfer reactions at high energy and ambiguities in heavy-ion potentials

“…The E-18 potential gives S values smaller by a factor of 2.75. Only the former values are in agreement with those obtained from a study [10] of the 28Si(d, 3He)ZVA1 reaction (S=3.8 and 0.49) or predicted from shell-model calculations [9] (S= 3.5 and 0.55). Again the surface-transparent E-18 potential is unacceptable at 352 MeV.…”

Study of the Low-Lying Excited States ofAl29. I.Si30(Jones1 1969Phys. Rev.27250View full textAdd to dashboardCite

“…If we assume the 3.07-MeV state to be §+, then the ldz/2 and 2si/ 2 shells have approximately equal populations, the same as is observed for Si 28 as shown in columns 4 and 5 of Table V. The upper ld 3 / 2 limit shown in column 5 must be treated with reserve as Wildenthal and Newman 19 were unable to resolve the f + state at 2.976 MeV in AF from a |+ state at 3.001 MeV. Their spectroscopic factor was extracted after fitting a combination of 1=2+4 to the observed doublet distribution.…”

IsS32(OCharlton1, Robson2 1974Phys. Rev. Lett.10000View full textAdd to dashboardCite

“…The distorted waves were generated with the use of a Woods-Saxon well either with or without an Independent imaginary part, 7 where L is the partial-wave quantum number, i.e., by a potential of the form…”