An optical model for the scattering of nucleons from 4He at energies below 20 MeV

Satchler, G.R.; Owen, L.W.; Elwyn, A.J.; Morgan, G. L.; Walter, R. L.

doi:10.1016/0375-9474(68)90216-9

Cited by 203 publications

(74 citation statements)

References 45 publications

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“…13 Be to get a correct binding energy in 14 Be [19]. In a first paper [10] based on a two-neutron Tamm-Dancoff model and with a zero range effective interaction fitted on 14 C and 12 Be we found that an inversion of the 1p 1/2 -2s shells leads to the correct binding energy in 14 Be without modifying the known d 5/2 energy nor assuming a bound 13 Be.…”

Section: Results Formentioning

confidence: 86%

“…Therefore 13 Be what, in an independent particle model, would mean that the lowest unoccupied shell in 12 Be is an s shell and would reject the possibility of inversion. In our model however 13 Be is described as a neutron added to the correlated core of 12 Be which is a mixture of many different states, in particular it has large components on configurations with a closed 1p 3/2 shell plus two neutrons on the 2s or on the 1p 1/2 shell.…”

Section: Results Formentioning

confidence: 99%

Section: Results Formentioning

confidence: 99%

“…In our model however 13 Be is described as a neutron added to the correlated core of 12 Be which is a mixture of many different states, in particular it has large components on configurations with a closed 1p 3/2 shell plus two neutrons on the 2s or on the 1p 1/2 shell. Therefore these two components will give in 13 Be two different states, a 1/2 − state built on the first one with the last neutron on the p 1/2 shell (the 2s-shell is filled) and a 1/2 + state built on the second one with the last neutron on the empty 2s shell. In a weak coupling model, because of the known inversion in n+ 10 Be system, one can show that the 1/2 + state is lower than the 1/2 − state by about 0.32 MeV and at about 0.3 MeV above the 12 Be+n threshold what is in qualitative agreement with the experimental state seen recently.…”

Section: Results Formentioning

confidence: 99%

“…In section III we recall the properties and equations of the particle-particle RPA model. The results of this model are presented and discussed in section IV for 14 C-10 C, 12 Be- 8 Be and 11 Li-7 Li and in section V for 14 Be- 10 Be with a discussion on the 13 Be and 11 Be spectra. At the end, section VI is devoted to our conclusions.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Two-body correlations inN=8and 10 nuclei and effective neutron-neutron interactions in Tamm-Dancoff and two-particle random phase approximation models

Pacheco

Mau

2002

Phys. Rev. C

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We apply a particle-particle RPA model to study the properties of the two-neutron valence wave function in nuclei 14 C, 12 Be, 11 Li and 14 Be. The RPA model takes account of twobody correlations in the cores so that it gives a better description of energies and amplitudes than models which assume a neutron closed shell (or subshell) core. With a Gogny neutronneutron effective interaction or with the equivalent density dependent delta force we are able to reproduce the two-neutron separation energies in these nuclei and in the corresponding cores, except for 9 Li. These calculations suggest the same 2s-1p 1/2 shells inversion in 12 Be-13 Be than in 11 Be.

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Section: Results Formentioning

confidence: 86%

Section: Results Formentioning

confidence: 99%

Section: Results Formentioning

confidence: 99%

Section: Results Formentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Two-body correlations inN=8and 10 nuclei and effective neutron-neutron interactions in Tamm-Dancoff and two-particle random phase approximation models

Pacheco

Mau

2002

Phys. Rev. C

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Elastic Recoil Detection Analysis

Trocellier¹

2000

Encyclopedia of Analytical Chemistry

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In 1976, a Canadian group described in detail for the first time a new ion beam analytical method based on the elastic recoil of target nuclei collided with high energy heavy incident ions. In this case 25–40‐MeV 35 Cl impinged on a multilayer C or Cu (backing)/LiF or LiOH/Cu (30–150 nm)/LiF or LiOH and H, Li, O and F recoiled atoms were detected. These exemplified the main characteristics of elastic recoil detection analysis (ERDA): its sensitivity to depth distribution and its ability to detect light elements in heavy substrates. In 1979, the use of megaelectronvolt energy 4 He beams permitted the use of ERDA to be extended to depth profiling of hydrogen isotopes in the near surface region of solids. ERDA has rapidly been revealed to be an excellent alternative to resonant nuclear reaction spectrometry for hydrogen determination in solids. Despite its less advantageous performance with respect to its lower depth resolution, lower analyzable depth, comparable sensitivity and more restricting irradiation and detection geometry, some ERDA features have made its development in ion beam analysis (IBA) laboratories worldwide easier; these are simultaneous access to 1 H and 2 H depth distributions, access to single‐ended Van de Graaff accelerators compared with tandem or cyclotrons, the ability to be combined with Rutherford backscattering spectrometry (RBS) and a less damaging effect on the investigated targets compared to those generated by heavy ions. The development of detection devices and the analytical capabilities offered by high‐energy heavy ion‐induced ERDA in material sciences for profiling light, medium and large mass number elements give this method a wide area in which to progress as illustrated by discussions at ion beam‐related technique conferences.

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Elastic Recoil Detection Analysis

Trocellier

Sajavaara

2008

Encyclopedia of Analytical Chemistry

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In 1976, a Canadian group described in detail for the first time a new ion beam analytical method based on the elastic recoil of target nuclei collided with high‐energy heavy incident ions. In this case, 25–40‐MeV 35 Cl impinged on a multilayer C or Cu (backing)/LiF or LiOH/Cu (30–150 nm)/LiF or LiOH and H, Li, O, and F recoiled atoms were detected. These exemplified the main characteristics of elastic recoil detection analysis (ERDA): its sensitivity to depth distribution and its ability to detect light elements in heavy substrates. In 1979, the use of megaelectronvolt energy 4 He beams permitted the use of ERDA to be extended to depth profiling of hydrogen isotopes in the near‐surface region of solids. ERDA has rapidly been revealed to be an excellent alternative to resonant nuclear reaction spectrometry ( see Nuclear Reaction Analysis ) for hydrogen determination in solids. Despite its less advantageous performance with respect to its lower depth resolution, lower analyzable depth, comparable sensitivity, and more restricting irradiation and detection geometry, some ERDA features have made its development in ion beam analysis (IBA) laboratories worldwide easier; these are simultaneous access to 1 H and 2 H depth distributions, access to single‐ended Van de Graaff accelerators compared with tandem accelerators or cyclotrons, and the ability to be combined with Rutherford backscattering spectrometry (RBS) ( see Rutherford Backscattering Spectroscopy ). The development of detection devices and the analytical capabilities offered by high‐energy heavy‐ion‐induced ERDA in material sciences for profiling light, medium, and high mass number elements give this method a wide area in which to progress. The main advantage of heavy‐ion ERDA and quite unique feature among analysis techniques is the fact that all sample elements can be depth profiled in one measurement by single detector telescope. By means of Monte Carlo (MC) simulations, the interpretation and reliability of the results have increased greatly over the last few years.

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An optical model for the scattering of nucleons from 4He at energies below 20 MeV

Cited by 203 publications

References 45 publications

Two-body correlations inN=8and 10 nuclei and effective neutron-neutron interactions in Tamm-Dancoff and two-particle random phase approximation models

Two-body correlations inN=8and 10 nuclei and effective neutron-neutron interactions in Tamm-Dancoff and two-particle random phase approximation models

Elastic Recoil Detection Analysis

Elastic Recoil Detection Analysis

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