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ABSTRACT: A local, state-independent nuclear single-particle potential for 208Pb was developed by suitably shaping the nuclear central term and the related spin-orbit term of Thomas type. The aim was
to reproduce accurately the excitation energies of the known single-particle states in 207Tl, 207Pb, 209Bi and 209Pb as well as the recently observed dependence of the spin-orbit splittings on angular momentum ℓ and principal quantum number
n. As result, a set of orthogonal proton and neutron wave functions was obtained which were used for a consistent reanalysis
of proton and neutron single-particle transfer reactions on 208Pb. The quality of the description of measured angular distributions is comparable with that obtained originally with individual
“best fit” potentials. The resulting single-particle spectroscopic factors amount on the average to S≈ 0.7. Single-particle densities derived from these wave functions are in qualitative agreement with measured charge and mass
densities for 208Pb.
European Physical Journal A 11/2000; 9(3):313-326. · 2.19 Impact Factor
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ABSTRACT: The 46,48,50Ti(d,3He)45,47,49Sc reactions have been investigated at an incident energy of 52 MeV. Angular distributions have been measured and spectroscopic factors have been deduced by means of a DWBA analysis. Positive-parity states have been found up to about 9 MeV excitation energy, revealing about 70% of the 1d5/2 proton-hole strength. The 2s1/2, 1d3/2 and 1d5/2 strength distributions are compared with predictions from phonon-hole coupling calculations.
Journal of Physics G Nuclear Physics 12/1998; 5(10):1421.
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ABSTRACT: The reactions22Ne(d, t)21Ne and22Ne(d, 22Ne([(d)\vec], t)21F{}^{22}Ne(\vec d, \tau ){}^{21}F
experiment, several spins could be determined in21F. From a comparison of the triton and particle spectra,T=3/2 states in21Ne could be identified and on this basis the new information on spins of21F states could be transferred to their analog states in21Ne. The completeT
andT
> parts of the (2s, 1d) strengths could be observed. The 1p strength is highly fragmented. Of theT
part only 60% of the 1p1/2 and 40% of the lp3/2 strength could be found, but the totalT
> part of the 1p strength could be localized. The spectroscopic results for positive parity states are in qualitatively good agreement with shell model predictions.
Zeitschrift für Physik A Hadrons and Nuclei 05/1981; 301(2):157-163.
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ABSTRACT: The reactions22Ne(d, t)21Ne and22Ne(d, t)21F have been investigated in a parallel experiment atEd=52MeV. Energy spectra of tritons andt particles have been measured up to excitation energies of 18MeV in both21Ne and21F nuclei. Thel values could be determined, and spectroscopic factors have been obtained by a DWBA analysis of the measured angular distributions. Together with the results from a preceding
experiment, several spins could be determined in21F. From a comparison of the triton andt particle spectra,T=3/2 states in21Ne could be identified and on this basis the new information on spins of21F states could be transferred to their analog states in21Ne. The completeT andT> parts of the (2s, 1d) strengths could be observed. The 1p strength is highly fragmented. Of theT part only 60% of the 1p1/2 and 40% of the lp3/2 strength could be found, but the totalT> part of the 1p strength could be localized. The spectroscopic results for positive parity states are in qualitatively good agreement with shell model predictions.
European Physical Journal A - EUR PHYS J A. 01/1981; 301(2):157-163.
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ABSTRACT: Using the (
[(d)\vec]\vec d
,3He) reactions on90Zr and144Sm at 52 MeV spins of deeply-bound hole states have been measured for the first time. In contrast to neutron pick-up reactions the shell model strength is exhausted which enables us to derive the 1f and 1g spin-orbit splitting.
Zeitschrift für Physik A Hadrons and Nuclei 01/1980; 297(4):307-309.
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ABSTRACT: Branching ratios for proton and alpha-particle decay of hole states in 16O have been determined from a 17O(d, tc) coincidence experiment. Total widths have been measured in s supplementary 17O(3He, alpha)16O experiment. Proton decay of stretched d5/2 . p3/2- states to the p1/2- ground state of 15N is interpreted in terms of a nuclear Auger effect. Present address: IEKP, Kernforschungszentrum, 7500 Karlsruhe, West Germany.
Physics Letters B - PHYS LETT B. 01/1980; 96:35-38.
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ABSTRACT: Large and characteristic vector-analyzing powers of the (d, tau) reactions on 16O, 28Si and 40Ca at 52 MeV have been observed and utilized to determine the spins of 1p hole states in 15N and 27Al and of 1d hole states in 39K. The results are pertinent to the empirical determination of the 1p and 1d spin-orbit splittings.
Physics Letters B - PHYS LETT B. 01/1977; 72(2):169-172.
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ABSTRACT: The (d,3He) reaction has been used to excite proton hole states in8Li,9Be and10Be. Angular distributions have been measured and have been analyzed in terms of the DWBA to get spectroscopic factors for the considered transitions. Excitation energies and transition strengths are compared with the results of Cohen and Kurath's intermediate coupling shell model calculations, where the two models of the effective interaction produce different results especially for transitions to final states in mass 8 and 10 nuclei. The experimental results are clearly in favour of the (6–16) 2 BME interaction. A positive parity state in10Be predicted by the calculations has been looked for and found at 9.60 MeV.
Zeitschrift für Physik A Hadrons and Nuclei 01/1975; 275(3):241-247.
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ABSTRACT: Energy spectra of3He-particles from the (d,3He) reaction on28, 29, 30Si,31P and32S have been measured at an incident energy of 52 MeV. Spectroscopic factors have been determined by comparison of measured and DWBA angular distributions. The results are compared with predictions of recent shell model calculations. Excitation energies and spectroscopic strengths of low lying positive parity states are fairly well described. The 1d
5/2 hole strengths distributions are not reproduced. The measured 1p hole strength decreases rapidly from28Si to28S. The occupation numbers of the different subshells show a considerably smoothed Fermi surface of these nuclei.
Zeitschrift für Physik A Hadrons and Nuclei 11/1974; 269(4):353-364.
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ABSTRACT: Mirror relations between levels of15N and15O below 11 MeV are derived from the16O(d,t)15N and16O(d,t)15O reactions. These relations and the resulting negative parity assignments disagree with previous work.
European Physical Journal A - EUR PHYS J A. 01/1973; 258(4):321-327.
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European Physical Journal A - EUR PHYS J A. 01/1972; 251(5):404-415.
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Physics Letters B - PHYS LETT B. 01/1969; 29(3):167-169.
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ABSTRACT: The (d,3He)-reactions on the target nuclei48,50Ti and51V have been studied with 52 MeV deuterons. The data were analyzed by means of the DWBA which is shown to be applicable at this energy. All our results agree well with the assumption of pure (f
7/2)n proton configurations for these nuclei.The inelastic scattering of 52 MeV deuterons from the lowest 2+ state in48Ti has been described in terms of the collective model as well as of the microscopic shell model. Good fits to the measured angular distributions have been obtained with reasonable values for the deformation parameters and the basic nucleon-nucleon interaction.
Zeitschrift für Physik A Hadrons and Nuclei 11/1967; 202(1):236-254.
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ABSTRACT: Le trou proton 1f7/2 a été localisé par la réaction ([MATH], 3He) sur 86Kr, 90, 92Zr et 92Mo. Il montre une structure fine très prononcée et une largeur qui augmente avec le carré de son énergie. The complete 1f7/2 proton hole strength has been localized in the ([MATH], 3He ) reaction at 52 MeV. The second moment of the highly structured strength distribution increases with the square of its energy.
http://dx.doi.org/10.1051/jphyscol:1984408.
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ABSTRACT: Energy spectra and angular distributions of 3He particles from the 32S(d, 3He)31P reaction have been measured at an incident energy of 52 MeV. A total of 15 levels has been observed upto an excitation energy of 10 MeV. A yet unknown level at EX = 6.41 ± 0.06 MeV has been observed. The whole strength is concentrated in one single state while the and especially the strengths are split into several levels. The spectroscopic factors of positive parity states agree fairly well with recent shell model calculations.As predicted by an effective interaction calculation, 1p hole states have been observed at an energy much lower than expected from an (e, e'p) experiment. Angular shifts between measured and calculated angular distributions have been found to be of the type of recently reported shell effects. The observed forward angle j-effect fits perfectly into this concept.
Nuclear Physics A.
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ABSTRACT: The angular distributions for the elastic scattering of 52 MeV deuterons from 16 nuclei ranging from carbon to uranium have been measured. The optical model is found to describe the experimental results if one accounts for the spin-orbit interaction.
Physics Letters.
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ABSTRACT: Differential cross sections for the 209Bi(d, 3He)208Pb transitions to the proton particle-proton hole states in 208Pb were obtained with the 45 MeV analyzed deuteron beam from the JULIC cyclotron and the high resolution spectrograph BIG KARL. 72 states up to 6.6 MeV were studied with an overall resolution of 12 to 15keV. Spectroscopic factors were extracted relative to the simultaneously measured calibration reaction 208Pb(d, 3He)207Tl. For 26 states new parity assignments were possible on the basis of the measured angular distributions. The deduced inclusion into one of the four multiplets put limits on the possible spins of the states in question. With the help of sum rule arguments the spins of 12 states were assigned. The comparison with shell model calculations give only rough agreement as they predict the energies of the respective states about 300 keV too high. The magnetic dipole state at 5.846 MeV was observed with a Spectroscopic factor C2S = 0.17. From this, together with the transition probability B(M1↑) = (1.6 ± 0.5) μN2 from a experiment we derived size and relative sign of the dominant neutron and proton spin-flip amplitudes. The result gives clear evidence for the isoscalar character of this state in accordance wtih TDA and RPA predictions. The matrix elements of the two-body residual interaction were derived unambiguously for the multiplets. For the and multiplets uncertainties are larger because of assumptions of some of the spins for the states of high excitation energy. The four monopole terms are found close to the average of −308 keV. They are dominated by the Coulomb contributions of ≈ − 216 keV. The deduced J-dependence of the matrix elements differs from those found in other systematic investigations indicating more complicated underlying nuclear forces must contribute.
Nuclear Physics A.
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ABSTRACT: Angular distributions for the elastic scattering of 52 MeV deuterons were measured from 27 nuclei ranging from hydrogen to uranium. The experimental data have been analysed in terms of the optical model. The inclusion of a vector spin-orbit term in the potential is necessary for nuclei with A > 100. For light nuclei with 12 ≦ A ≦ 50, good fits to the experimental angular distributions could also be obtained without a spin-orbit potential. The optical-model parameters for nuclei with A ≧ 12 are discussed with respect to the dependence on the energy E, the charge Z and the mass A. The A-dependence of the real potential depth V can be understood as a consequence of the spatial polarization of the deuteron during the scattering process. Discrepancies between optical-model calculations and experimental angular distributions observed in the elastic scattering processes from 1H, 3He, and 4He indicate contributions from transfer reactions.
Nuclear Physics A.
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ABSTRACT: Energy spectra and angular distributions of the 3He particles from the (d, τ) reaction on 24, 25, 26Mg have been measured at Ed = 52 MeV with an energy resolution of about 80 keV. Excited states up to 11 MeV have been observed in 23Na. High-lying l = 1 transitions were excited by pick-up from the shell. Discrepancies of 1p proton separation energies determined by quasi-free scattering and proton pick-up are discussed. The l-values have been determined for transitions to a variety of states with unknown spins in the doubly odd 24Na nucleus. A spin 5+ can be attributed to the 1.51 MeV level which is then the second member of the 4+ ground state rotational band. Several previously unknown spins could be determined in the 25Na level scheme. There is an apparent similarity in the proton-hole spectra of 23Na and 25Na and consequently a similar rotational structure. The spectra of 23Na, 24Na and 25Na are discussed in the framework of the Nilsson model. The spectroscopic factors are compared with shell-model calculations and predictions from a simple rotational model. States which are excited by pick-up from Nilsson orbit no. 7 contain approximately 75 % of the total sd strength. This contradicts the rotational model and requires strong band mixing. On the other hand the shell-model calculations account for excitation energies and spectroscopic factors of low-lying positive parity states. The data provide information about T = 1 and states in mass-24 and mass-25 nuclei respectively.
Nuclear Physics A.
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ABSTRACT: The reactions 17O(d, t) 16O and 17O(d, τ)16N have been investigated at Ed = 52 MeV. Energy spectra of tritons and τ-particles have been measured simultaneously up to excitation energies of 22 MeV in 16O and 10 MeV in 16N, respectively. Spectroscopic factors have been obtained by a DWBA analysis of the measured angular distributions. From the comparison of the t- and τ-spectra analog (T = 1) states in 16O could be identified and the distribution of T = 0 and T = 1 spectroscopic strengths could be deduced. Nearly the total and hole strengths have been found and the particle-hole multiplets could be located both for T = 0 and T = 1. The average residual interactions in both shell-model configurations turned out to be strikingly different.
Nuclear Physics A.
