Neutron spectroscopic factor ofBe9from (Be

Abstract

Angular distributions of the 'Be ions from ( Be,'Be) reactions on the target nuclei "Si and ' Ca have been measured at an energy of 20 MeV (lab). The products of the spectroscopic factors of Be and several states of the residual nuclei ' Si and "Ca were extracted from a distortedwave-Born-approximation analysis.Using the spectroscopic factors of "Si and "Ca levels, known from (d, p) reactions, a spectroscopic factor of 0.42 + 0.04 for 'Be was found. NUCLEAR REACTIONSSi( Be, 8Be) and 40Ca{~Be,8Be), E|~b --20 Mev; mea.sured o(8) for stripping to levels of Si and Ca, finite-range DWBA analysis; deduced spectroscopic factor of Be.

Elastic scattering and reactions of light exotic beams

“…However, it has one important difference in that the spectroscopic factor for the 9 Be → 8 Be + n overlap is considerably smaller (0.42 [241]) than those for similar processes involving weakly-bound radioactive nuclei. These properties make 9 Be an excellent benchmark for comparison with the light weakly-bound radioactive nuclei.…”

“…The spectroscopic factor and binding potential for the 9 Be = n + 8 Be overlap were from Ref. [241]. Transfer to the lowest 0 + resonance of 8 Be only was included, with couplings to states in 209 Pb as per Table 1 (transfers to the 11/2 + and 15/2 − states were again omitted).…”

Generation of a repulsive dynamic polarization potential by transfer couplings

“…The latter set of form factors were taken to be those obtained from the adiabatic model analysis of the 20 MeV 208 Pb(d,p) 209 Pb data. Lang et al [27] obtained a 9 Be/ 8 Be spectroscopic factor of C 2 S = 0.42 for the 1p 1/2 neutron bound in a Woods-Saxon potential well with parameters R = 1.15 × 8 1/3 fm, a = 0.57 fm with the depth adjusted to give the correct binding energy and a spin-orbit component with the same geometry parameters and a fixed depth of 5.5 MeV. The form-factors of Kovar et al [22] bound the neutron in a Woods-Saxon potential well with parameters R = 1.23 × 208 1/3 fm, a = 0.65 fm with the depth adjusted to give the correct binding energy and a spin-orbit component with the same geometry parameters and a fixed depth of 6.0 MeV.…”

“…We therefore performed a second set of calculations including the single neutron stripping, with the form factors for the 9 Be/ 8 Be and 209 Pb/ 208 Pb overlaps being taken from Lang et al [27] and Kovar et al [22], respectively. The latter set of form factors were taken to be those obtained from the adiabatic model analysis of the 20 MeV 208 Pb(d,p) 209 Pb data.…”

Exploring the breakup and transfer coupling effects in9Be elastic scattering

“…The Woods-Saxon potential parameters (radius and diffuseness) along with a spin-orbit component for the binding of neutron in 9 Be is taken from Ref. [23]. The 1/2 + and 5/2 + resonance states are generated by using the radius and diffuseness parameters same as that of the ground state while the potential depth is varied.…”