Comparaison des réactions (d, 3He) ET (d, t) sur quelques noyaux N = Z

Gaillard, M.J.; Bouche, Raymond; Feuvrais, L.; Gaillard, P.; Guichard, A.; Gusakow, M.; Leonhardt, J.L.; Pizzi, J.R.

doi:10.1016/0375-9474(68)90812-9

Cited by 59 publications

(6 citation statements)

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“…The setting of the MUST2 array was optimized for the detection of 3 H rather than 3 He, which explains the limited angular coverage. In addition to our results, we included published differential cross sections for reactions at about the same incident energy on 16 O and 18 O targets in direct kinematics [19][20][21]. Differential cross sections were calculated with the FRESCO code [22], using the coupled reaction channel (CRC) and coupled discretized continuum channel (CDCC) approaches to include couplings to the single nucleon pickup reactions and to the deuteron breakup, respectively.…”

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confidence: 99%

“…C 2 S exp strongly depend on radii with ÁSF=SF % 6Ár rms =r rms in the 14 Oðd; tÞ analysis. We first reanalyzed published data for single nucleon pickup reactions at about the same incident energy in direct kinematics [19][20][21] (Fig. 2) by the CRC calculations assuming a Ál ¼ 1 transferred angular momentum, as expected from the transfer of a 0p nucleon.…”

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Limited Asymmetry Dependence of Correlations from Single Nucleon Transfer

et al. 2013

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Single nucleon pickup reactions were performed with a 18:1 MeV=nucleon 14 O beam on a deuterium target. Within the coupled reaction channel framework, the measured cross sections were compared to theoretical predictions and analyzed using both phenomenological and microscopic overlap functions. The missing strength due to correlations does not show significant dependence on the nucleon separation energy asymmetry over a wide range of 37 MeV, in contrast with nucleon removal data analyzed within the sudden-eikonal formalism. DOI: 10.1103/PhysRevLett.110.122503 PACS numbers: 24.50.+g The existence of single-particle-like modes in nuclei, near the Fermi surface, is particularly important because these are at the basis of the nuclear shell model and thus govern the low energy nuclear dynamics. Yet, they result from nontrivial many-body correlations, which affect energy ordering and filling of active orbits. Spectroscopic factors (SFs) are a unique tool to address the question of correlations as they are strictly linked to the notion of shell occupancies and can be probed using direct reaction cross section measurements [1,2]. Information for stable nuclei was formerly provided by the electromagnetic probe (e, e 0 p) [3][4][5]. Even for closed shell nuclei like 16 O or 208 Pb, a cross section reduction by 30%-40% relative to an independent-particle-based model was observed. Different origins are now well established, like short range correlations [1] and couplings to collective modes at high excitation energy [6] or to the continuum [7]. Single nucleon pickup reactions were also used for stable nuclei yielding results consistent with (e, e 0 p) measurements [8,9].For nuclei away from the valley of stability, new approaches have been developed in inverse kinematics at various incident energies, knockout and transfer reactions. From knockout reactions at intermediate energy, a reduction factor R s was deduced as the ratio between the experimental cross section and a theoretical value obtained in a sudden-eikonal approach [10]. A strong dependence was claimed for R s versus the asymmetry (difference in separation energy) ÁS ¼ ðS p À S n Þ with ¼ þ1 (À1) for proton (neutron) removal reactions, with a reduction as high as 70% for large positive ÁS values. This reduction is still not understood and was first accounted for by possible missing correlations in shell-model calculations [10]. Different conclusions were drawn from (i) the possibility of dissipative processes beyond the sudden approximation [11,12], and (ii) transfer reactions at lower incident energies showing no ÁS dependence of R s [13]. From a theoretical point of view, ab initio calculations suggest only a mild dependence of SFs on ÁS [7,14], with equal SFs found for the nucleon removals from 56 Ni [6] despite significant ÁS values (AE 9:5 MeV). Coupled-cluster calculations [7] pointed out a further decrease of proton SFs for isotopes at the neutron dripline, due to coupling to the continuum. This has the substantial effect of enhancing the dependence on...

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Limited Asymmetry Dependence of Correlations from Single Nucleon Transfer

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“…The a was changed from 0.5 to 0.8 fm while rg was adjusted to reproduce the rms radius of the valence proton in l2C by Eq. (8). The extracted spectroscopic factor as a function of a is shown in Fig.…”

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confidence: 99%

“…[<P(r)]2 1 1 1 2 dr J (8) where 4>(r) is the single-particle wave function of the 11B + p bound state in l2C which can be calculated by solving the Schrodinger equation with Woods-Saxon potential. The a was changed from 0.5 to 0.8 fm while rg was adjusted to reproduce the rms radius of the valence proton in l2C by Eq.…”

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“…Shell model calculations done by Cohen-Kurath [4] in 1967 predicted the proton spectroscopic factor of the ,2C ground state to be Si2C = 2.85. After that, several experiments were performed through nC(e,e'p)"B [5], n C(p,2p)"B [6], uB(d,n)nC [7], 12C(<7,3H e)n B [8,9], u B(3H e,t/)12C [10,11], n B(7L i,6H e)12C [12], and l2C (n B, 12C )n B [13,14] reactions. The spectro scopic factors extracted from these measurements are different from each other in the range of 1.85 and 4.1.…”

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Proton spectroscopic factor of the12Cground state from the12C(11B<

et al. 2014

Phys. Rev. C

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The angular distributions of the i2C ("B , " B ) 12C and 12C(n B, 12C)n B reactions have been measured at an incident energy of 50 MeV by using the high resolution Q3D magnetic spectrometer of the HI-13 tandem accelerator at China Institute of Atomic Energy, Beijing. The optical potential parameters of the 11B + l2C system are determined by fitting the angular distribution of the elastic scattering and then used to predict the cross sections of the elastic transfer reaction leading to the ground state in l2C based on distorted-wave Born approximation (DWBA) analysis. Taking into account the interference between the elastic scattering and the elastic transfer processes, the proton spectroscopic factor of the 12C ground state is extracted to be 2.15 ± 0.23 by constraining the geometrical parameters r0 and a using the rms radius of the valence proton in the l2C ground state.The essential constituents of nuclear shell model are the single-particle orbits of the mean field which are occupied by protons and neutrons under the Pauli principle [1]. The spectroscopic factor is defined by a matrix element which describes the overlap between the initial and final states and yields the information on the occupancy of a given single particle orbit [2], It provides quantitative information about the single-particle structure of nuclei and plays an important role in a variety of topics on nuclear reaction and nuclear astrophysics.The proton spectroscopic factor of the 12C ground state is of special interest since it can be used in the calculation of the astrophysical n B(/>, y ) 12C rate [3]. Shell model calculations done by Cohen-Kurath [4] in 1967 predicted the proton spectroscopic factor of the ,2C ground state to be Si2C = 2.85. After that, several experiments were performed through nC(e,e'p)"B [5], n C(p,2p)"B [6], uB(d,n)nC [7], 12C(<7,3H e)n B [8,9], u B(3H e,t/)12C [10,11], n B(7L i,6H e)12C [12], and l2C (n B, 12C )n B [13,14] reactions. The spectro scopic factors extracted from these measurements are different from each other in the range of 1.85 and 4.1.Generally speaking, the elastic transfer reaction is regarded as a good tool for extracting spectroscopic factors since the spectroscopic factors as well as the distorted scattered waves are identical in both entrance and exit channels. Thus, the elastic transfer reaction enables the reduction of the uncertainty of the spectroscopic factor and has been frequently used to determine the neutron spectroscopic factor of 7Li [15]; the *zhli@ciae.ac.cn proton spectroscopic factors of 9Be [16], 10B [17], ,4N [17], and lbO [17]; the 3He spectroscopic factor of 12C [18]; and the 4He spectroscopic factors of 7Li [19] and 13C[18].For the 12C ("B , 12C )n B elastic transfer reaction, the angu lar distributions have been well reproduced by the distortedwave Born approximation (DWBA) theory. However, there is still a remarkable discrepancy in the proton spectroscopic factor of the 12C ground state [14], It shows a smooth change with energy, and even exceeds the theoretical limit of...

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Tables of Excitations From Reactions With Charged Particles. Part 1: Z = 3 - 36

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Comparaison des réactions (d, 3He) ET (d, t) sur quelques noyaux N = Z

Cited by 59 publications

References 11 publications

Limited Asymmetry Dependence of Correlations from Single Nucleon Transfer

Limited Asymmetry Dependence of Correlations from Single Nucleon Transfer

Proton spectroscopic factor of the12Cground state from the12C(11B<

5-Boron

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