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Journal articles on the topic 'Nuclear optical potentials'

Author: Grafiati

Published: 4 June 2021

Last updated: 13 February 2022

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1

PACHOURI, DIPTI, MANJARI SHARMA, SYED RAFI, and W. HAIDER. "MICROSCOPIC OPTICAL POTENTIAL FROM ARGONNE INTER-NUCLEON POTENTIALS." International Journal of Modern Physics E 20, no. 11 (November 2011): 2317–27. http://dx.doi.org/10.1142/s0218301311020319.

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In the present work we describe our results concerning the calculation of equation of state of symmetric zero temperature nuclear matter and the microscopic optical potential using the soft-core Argonne inter-nucleon potentials in first order Brueckner–Hartree–Fock (BHF) theory. The nuclear matter saturates at a density 0.228 nucleon/fm 3 with 17.52 MeV binding energy per nucleon for Argonne av-14 and at 0.228 nucleon/fm 3 with 17.01 MeV binding energy per nucleon for Argonne av-18. As a test case we present an analysis of 65 and 200 MeV protons scattering from 208 Pb . The Argonne av-14 has been used for the first time to calculate nucleon optical potential in BHF and analyze the nucleon scattering data. We also compare our reaction matrix results with those using the old hard-core Hamada–Johnston and the soft-core Urbana uv-14 and Argonne av-18 inter-nucleon potentials. Our results indicate that the microscopic potential obtained using av-14 gives marginally better agreement with the experimental data than the other three Hamiltonians used in the present work.

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2

Friedman, E., A. Gal, and C. J. Batty. "Density-dependent K− nuclear optical potentials from kaonic atoms." Nuclear Physics A 579, no. 3-4 (October 1994): 518–38. http://dx.doi.org/10.1016/0375-9474(94)90921-0.

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3

Christley, J. A., M. A. Nagarajan, and I. J. Thompson. "Optical fusion potentials for16O+208Pb." Journal of Physics G: Nuclear and Particle Physics 17, no. 9 (September 1, 1991): L163—L168. http://dx.doi.org/10.1088/0954-3899/17/9/004.

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4

Billah, M. M., M. N. A. Abdullah, S. K. Das, M. A. Uddin, A. K. Basak, I. Reichstein, H. M. Sen Gupta, and F. B. Malik. "Alpha–Ni optical model potentials." Nuclear Physics A 762, no. 1-2 (November 2005): 50–81. http://dx.doi.org/10.1016/j.nuclphysa.2005.07.020.

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5

HAIDER, WASI, BHARTI SHARMA, and J. R. ROOK. "NUCLEON–NUCLEUS OPTICAL POTENTIAL FROM HARD- AND SOFT-CORE INTERNUCLEON POTENTIALS." International Journal of Modern Physics E 14, no. 05 (July 2005): 807–19. http://dx.doi.org/10.1142/s0218301305003533.

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We have compared the binding energy of nuclear matter and the nucleon–nucleus optical potential, calculated in Brueckner theory starting from both the soft-core Urbana V-14 and the hard-core Hamada–Johnston internucleon potentials. Our results show that the real central part of the optical potential calculated from V-14 is about 10 MeV deeper than from the hard-core potential in the energy region 1–200 MeV. This greater depth mainly comes from the internucleon S- and D-states. In these states, the V-14 and Hamada–Johnston potentials give different phase shifts, the V-14 being in better agreement with experimental data. This difference is further enhanced by the Pauli principle in the calculation of the optical potential. Our analysis of proton–40 Ca differential cross-section and polarization data, in the energy region 30–200 MeV, shows that the optical potential calculated using V-14 is in better agreement with the data as compared with the Hamada–Johnston potential.

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6

Kowalski, K. L. "Formalism-dependent optical potentials." Il Nuovo Cimento A 92, no. 3 (April 1986): 289–308. http://dx.doi.org/10.1007/bf02724246.

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7

Li, Xiaohua, Haixia An, and Chonghai Cai. "The folding deuteron optical model potentials." European Physical Journal A 39, no. 2 (February 2009): 255–62. http://dx.doi.org/10.1140/epja/i2008-10718-y.

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8

KHAN, SOHAIL A. "IWBC ANALYSIS WITH QUASIMOLECULAR OPTICAL POTENTIALS." International Journal of Modern Physics E 14, no. 02 (March 2005): 269–78. http://dx.doi.org/10.1142/s0218301305003028.

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The quasimolecular optical potential with Incoming Wave Boundary Condition model is used to obtain the fusion and elastic scattering cross-section at the sub-Coulomb region and above. This has been done for the 16 O +16 O and 12 C +12 C systems. It is found that sudden potentials describe well the average trend in the fusion and elastic scattering cross-section using the Incoming Wave Boundary Condition Method. Potentials fits for low energy are then used to obtain cross-sections at higher energies. Excellent agreement is obtained for the location of various peaks observed experimentally, especially in the case of 16 O +16 O . The parameters from these potentials give information on the nuclei in these dynamical situations. We find that a larger radius and a low density in the central region is required to explain the phenomena. The range of Yukawa potentials used are also larger by a factor of two as compared to those used by other authors.

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9

Hefter, Ernst F. "The Energy Dependence of the Imaginary Nuclear Potential." Zeitschrift für Naturforschung A 40, no. 5 (May 1, 1985): 462–65. http://dx.doi.org/10.1515/zna-1985-0506.

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Recently the inverse mean field method (Imefim) has been shown to lead to a specific energy dependence of the real central nuclear part, V, of the optical model potential for nucleon-nucleus scattering. Proceeding from V towards the imaginary volume term of the potential, Wυ, application of conservation laws yields a specific energy dependence for Wυ. It compares favourably with heuristic potentials.

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10

Cai, Chonghai, Qingbiao Shen, and Yizhong Zhuo. "Comparisons of Global Phenomenological and Microscopic Optical Potentials for Nuclear Data Predictions." Nuclear Science and Engineering 109, no. 2 (October 1991): 142–49. http://dx.doi.org/10.13182/nse91-a28513.

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11

Hama, S., B. C. Clark, R. E. Kozack, S. Shim, E. D. Cooper, R. L. Mercer, and B. D. Serot. "Dirac optical potentials constrained by a Dirac-Hartree approach to nuclear structure." Physical Review C 37, no. 3 (March 1, 1988): 1111–18. http://dx.doi.org/10.1103/physrevc.37.1111.

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12

Li, G. Q. "Microscopic nucleon-nucleus optical potentials at intermediate energies." Journal of Physics G: Nuclear and Particle Physics 19, no. 11 (November 1, 1993): 1841–58. http://dx.doi.org/10.1088/0954-3899/19/11/012.

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13

Mohr, Peter. "Cross-sections at sub-Coulomb energies: Full optical model versus barrier transmission for 40Ca + α." International Journal of Modern Physics E 28, no. 05 (May 2019): 1950029. http://dx.doi.org/10.1142/s0218301319500290.

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Cross-sections for [Formula: see text]Ca + [Formula: see text] at low energies have been calculated from two different models and three different [Formula: see text]-nucleus potentials. The first model determines the cross-sections from the barrier transmission in a real nuclear potential. Second, cross-sections are derived within the optical model (OM) using a complex nuclear potential. The excitation functions from barrier transmission are smooth, whereas the excitation functions from the OM show a significant sensitivity to the chosen imaginary potential. Cross-sections far below the Coulomb barrier are lower from barrier transmission than from the OM. This difference is explained by additional absorption in the tail of the imaginary part of the potential in the OM. At higher energies, the calculations from the two models and all [Formula: see text]-nucleus potentials converge. Finally, in contradiction to another recent study where a double-folding potential failed in a WKB calculation, the applicability of double-folding potentials for [Formula: see text]Ca + [Formula: see text] at low energies is clearly confirmed in the present analysis for the simple barrier transmission model and for the full OM calculation.

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14

RAFI, SYED, and W. HAIDER. "MICROSCOPIC NEUTRON OPTICAL POTENTIAL IN THE ENERGY REGION 65–225 MeV." International Journal of Modern Physics E 20, no. 09 (September 2011): 2017–26. http://dx.doi.org/10.1142/s0218301311019751.

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In the present work, we report a microscopic optical potential analysis of the extensive neutron elastic scattering data from 12 C , 40 Ca and 208 Pb in the 65–225 MeV energy region. Brueckner–Hartree–Fock method has been used to calculate the optical potential, where one requires internucleon potential to calculate reaction matrices which are then folded over the nucleon densities in the target nuclei. We report the predictions of the calculated potential using Argonne v-18 and Urbana v-14 local nucleon–nucleon potentials. The modern potential v-18 has been used for the first time to calculate the nucleon–nucleus optical potential. We also compare our predictions with the empirical potentials. The results indicate that the predictions of our microscopic potential are in better agreement with the experimental data as compared with the empirical global optical potentials.

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15

Nassurlla Maulen, Burtebayev Nassurlla, Kerimkulov Zhambul, Suzuki Takechi, Sakuta Stanislav, Nassurlla Marzhan, and Khojayev Romazan. "INVESTIGATION OF DEUTERON SCATTERING BY 7 Li NUCLEI AT ENERGY OF 14.5 MeV." PHYSICO-MATHEMATICAL SERIES, no. 6 (December 15, 2018): 15–22. http://dx.doi.org/10.32014/2018.2518-1726.12.

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The pronounced cluster structure of lithium isotopes is an excellent test for verification the various theoretical nuclear models. The study of the cluster exchange mechanism in direct nuclear reactions opens new possibilities in determining the structures of these nuclei. The sets of parameters of optical potentials available in the literature are vary, that can lead to ambiguity in determining the cluster spectroscopic factors of the studied nuclei. Therefore, an experimental study of the scattering process at energy E = 14.5 MeV has been carried out in order to obtain an independent global systematic of optical potentials for the d + 7 Li system. New experimental data were obtained in the current paper on the elastic and inelastic scattering of deuterons on 7 Li nuclei at energy E = 14.5 MeV. In addition to this, in our analysis we used experimental data on elastic scattering, measured previously at deuteron energies from 7 to 28 MeV. The analysis of the differential cross sections was performed within the framework of the optical model. The optimal parameters of optical potentials for the studied nucleus are established. The obtained parameters in this work will be used in the analysis of the data on inelastic scattering of deuterons and the 7 Li (d, t) reaction to refine the structural characteristics of lithium isotopes.

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16

Minato, Futoshi, Osamu Iwamoto, Kosho Minomo, Kazuyuki Ogata, Nobuyuki Iwamoto, Satoshi Kunieda, and Naoya Furutachi. "Nuclear data evaluation of long-lived fission products: Microscopic vs. phenomenological optical potentials." EPJ Web of Conferences 146 (2017): 12032. http://dx.doi.org/10.1051/epjconf/201714612032.

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17

Yang, Lei, Chengjian Lin, Huiming Jia, Nanru Ma, Dongxi Wang, Feng Yang, Lijie Sun, Xinxing Xu, Peiwei Wen, and Fupeng Zhong. "Reactions with Exotic Nuclei at Near and Sub-barrier Energies." EPJ Web of Conferences 223 (2019): 01071. http://dx.doi.org/10.1051/epjconf/201922301071.

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We will introduce some new results derived recently by the nuclear reaction group at China Institute of Atomic Energy, on the properties of the optical model potentials of neutron-halo 6He system and reaction mechanisms induced by proton-drip line nucleus 17F at energies around the Coulomb barrier. For the study of optical model potentials of exotic nuclear system, we proposed a novel method, i.e., the transfer reaction method. This method has been applied to extract the optical potentials of neutron-halo 6He+209Bi system by measuring the one-proton transfer reactions induced by 7Li on a 208Pb target. A complete picture of threshold anomaly behavior was obtained in the 6He+209Bi system for the first time, where a decreasing trend of the depth of the imaginary potential is observed in the deep sub-barrier region, and the reaction threshold energy is extracted. Moreover, results show thatthe dispersion relation is not applicable for this exotic nuclear system. Reaction mechanisms of proton-rich nuclear systems 17F+89Y and 58Ni were also studied at energies around the Coulomb barrier. Continuum discretized coupled-channels calculations indicate that the coupling effects of the continuum states of 17F+89Y is not significant. Thanks to the employment of a powerful ionization-chamber based detector array, the reaction products over a large Z in the systems of 17F+58Ni can be identified clearly. The data analysis is undergoing.

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18

Isaiah, Ochala, Terver Daniel, and O. Fiase Joseph. "A study of 12c +12c nuclear reaction using a new M3Y-type effective interaction." International Journal of Physics Research and Applications 3, no. 1 (August 20, 2020): 133–42. http://dx.doi.org/10.29328/journal.ijpra.1001031.

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This paper is a study of nuclear reactions involving 12C + 12C nuclei carried out with a heavy-ion nucleus-nucleus optical potential derived from a new M3Y-type effective interaction, called B3Y-Fetal, within the framework of optical model at the incident energies of 112, 126.7, 240, 300, 1016 MeV. Folding analyses of the differential cross sections associated with the elastic scattering of the nuclear system, determined at these incident energies with four B3Y-Fetal-based folded potentials constructed from double folding model, have shown the DDB3Y1- and BDB3Y1-Fetal potentials to be the best in excellent agreement with previous work done with the M3Y-Reid. The agreement of the B3Y-Fetal with the famous M3Y-Reid effective interaction, which is also used for folding analysis in this work, is further buttressed and well-established by the findings of this study Herein, the values of the renormalization factor, NR ranging from 1.1117 to 0.8121, obtained with the B3Y-Fetal have been found to be slightly higher, with lower reaction cross sections, aR = 1418 - 1047 millibarns, than NR = 0.9971 - 0.8108 obtained with the M3Y-Reid effective interaction whose accompanying reaction cross sections, being higher, range from 1431 to 1050 millibarns. This depicts the B3Y-Fetal as having a better performance. Additionally, results of folding analyses have shown the best-fit folded potentials, DDB3Y1- and BDB3Y1-Fetal potentials to be in agreement at all incident energies, implying that the cold nuclear matter has an underlying soft equation of state.

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19

EL-AZAB FARID, M., A. M. A. NOSSAIR, and AWAD A. IBRAHEEM. "FOLDING MODEL ANALYSIS OF 6He + 12C ELASTIC SCATTERING." International Journal of Modern Physics E 17, no. 04 (April 2008): 715–33. http://dx.doi.org/10.1142/s0218301308010106.

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Elastic scattering of the two-neutron halo nucleus, 6 He , on 12 C target at 38.3 and 41.6 MeV/nucleon has been analyzed in the framework of the double-folding optical model. Real double-folded potentials based on the realistic density-dependent DDM3Y and JLM effective nucleon–nucleon interactions are generated using different forms of the nuclear matter density distribution of 6 He . The imaginary optical potentials are taken in the conventional Woods–Saxon form. The bare (unnormalized) real folded potentials derived from the JLM interaction are more successful in reproducing the data at both energies than those derived from the DDM3Y interaction. The effect of contribution of the dynamic polarization potential is also studied. A semimicroscopic approximation is proposed to simulate this potential by introducing a repulsive real part extracted from the generated folded potential. Fits to data have been slightly improved by considering this approximation.

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20

Lê, Nguyễn Như, and Trần Viết Nhân Hào. "Microscopic optical potentials within the weak density dependent nucleon-nucleon effective interactions." Hue University Journal of Science: Natural Science 126, no. 1C (September 12, 2017): 17. http://dx.doi.org/10.26459/hueuni-jns.v126i1c.4402.

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<p class="tomtat1">The microscopic optical potentials have been investigated in the framework of the nuclear structure approach based on the energy-density functional approaches. The effective phenomenological nucleon-nucleon interaction SLy5 is consistently used to obtain the Hartree-Fock single particle states, the collective motion at small amplitudes of the target, and the coupling between the particle and phonons. The role of the weak density dependent interaction is showed. </p>

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21

Hasegawa, A., T. Mitsumori, M. Muraki, K. Koide, H. Kouno, and M. Nakano. "Optical Potentials near Fermi Surface by Nuclear Schwinger-Dyson Equations with Bare Vertex Approximation." Progress of Theoretical Physics 93, no. 4 (April 1, 1995): 757–70. http://dx.doi.org/10.1143/ptp/93.4.757.

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22

Mishra, A., A. Kumar, S. Sanyal, and S. Schramm. "Kaon and antikaon optical potentials in isospin asymmetric hyperonic matter." European Physical Journal A 41, no. 2 (May 31, 2009): 205–13. http://dx.doi.org/10.1140/epja/i2009-10777-6.

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23

Pachouri, Dipti, Syed Rafi, and W. Haider. "Microscopic optical potentials for nucleon–nucleus scattering at 65 MeV." Journal of Physics G: Nuclear and Particle Physics 39, no. 5 (April 4, 2012): 055101. http://dx.doi.org/10.1088/0954-3899/39/5/055101.

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24

Pang, D. Y., Y. L. Ye, and F. R. Xu. "Energy-dependent optical model potentials for α and deuteron with12C." Journal of Physics G: Nuclear and Particle Physics 39, no. 9 (July 25, 2012): 095101. http://dx.doi.org/10.1088/0954-3899/39/9/095101.

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25

Hamada, Sh, B. Alshahrani, Abd Elrahman Elgamala, N. Darwish, I. Bondouk, and Awad A. Ibraheem. "Analysis of 6Li+16O elastic scattering using different potentials." Revista Mexicana de Física 66, no. 3 May-Jun (May 1, 2020): 322. http://dx.doi.org/10.31349/revmexfis.66.322.

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Available experimental angular distributions for 6Li elastically scattered from 16O nucleus in the energy range 13.0–50.0 MeV are reanalyzed within the framework of optical potential, double folding optical potential as well as cluster folding potential. Special interest was paid to the cluster folding based on the well-known cluster structure of 6Li. Elastic scattering data for 6Li+16O system plotted as a function of momentum transfer showed that the real Coulomb nuclear interference region independent of the bombarding energy. This structural behavior for the data could be used to define the interaction potential with some certainty and to extract reliable values for the renormalization factors.

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26

Al-Ghamdi, A. H., Awad A. Ibraheem, and M. El-Azab Farid. "Comparative study of alpha + nucleus elastic scattering using different models." International Journal of Modern Physics E 24, no. 01 (January 2015): 1550003. http://dx.doi.org/10.1142/s0218301315500032.

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The alpha (α) elastic scattering from different targets potential over the energy range 10–240 MeV has been analyzed in the framework of the single-folding (SF) optical model. Four targets are considered, namely, 24 Mg , 28 Si , 32 S and 40 Ca . The SF calculations for the real central part of the nuclear optical potential are performed by folding an effective α–α interaction with the α-cluster distribution density in the target nucleus. The imaginary part of the optical potential is expressed in the phenomenological Woods–Saxon (WS) form. The calculated angular distributions of the elastic scattering differential cross-section using the derived semimicroscopic potentials successfully reproduce 36 sets of data all over the measured angular ranges. The obtained results confirm the validity of the α-cluster structure of the considered nuclei. For the sake of comparison, the same sets of data are reanalyzed using microscopic double-folded optical potentials based upon the density-dependent Jeukenne–Lejeune–Mahaux (JLM) effective nucleon–nucleon interaction.

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27

AHMED, HUSSEIN M. A., and E. H. ESMAEL. "THE APPLICATION OF THE MODIFIED GLAUBER MODEL II FOR THE DESCRIPTION PROTON-NUCLEUS SCATTERING: EFFECT OF RELATIVISTIC AND NON-RELATIVISTIC OPTICAL POTENTIALS." International Journal of Modern Physics E 12, no. 06 (December 2003): 845–62. http://dx.doi.org/10.1142/s0218301303001594.

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Calculations of total reaction cross-sections and differential cross-sections using the modified Glauber model II for p –16 O scattering in the energy range 100–497.5 MeV are compared with experimental data. The real parts of the nuclear central potential and spin-orbit potential were used to calculate the modified Glauber model II. The nuclear potential was constructed using two approaches: the Dirac-equation-based optical potential and the non-relativistic treatment. The phenomenological and analytical methods are used to calculate these two approaches. The strength of the real parts of central and spin-orbit potentials are normalized to the best fit to the data. The best values were obtained close to unity. Most of the calculations derived from the Dirac-equation-based optical potentials were more comparable with the experimental data than the non-relativistic calculations. This may be attributed to the delicate cancellation between the short-range repulsive and the long-range attractive contributions. The present investigation indicated that a good choice of the potential at given energy offers a reliable determination of the impact parameter estimated according to the modified Glauber model II.

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28

Chorozidou, Arsenia, and Theodoros Gaitanos. "Momentum dependent mean-fields of hyperons & antihyperons." EPJ Web of Conferences 252 (2021): 05006. http://dx.doi.org/10.1051/epjconf/202125205006.

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The in-medium properties of hyperons and antihyperons are studied with the Non-Linear Derivative (NLD) model and focus is made on the momentum dependence of strangeness optical potentials. The NLD model is based on the Relativistic Mean Field (RMF) approximation to Relativistic Hadrodynamics (RHD) approach of nuclear systems, but it incorporates an explicit momentum dependence of mean-fields. The extension of the NLD model to the baryon and antibaryon octet is based on SU(6) and G-parity arguments. It is demonstrated that with a proper choice of momentum cut-offs, the Λ and Σ optical potentials are consistent with recent studies of the chiral effective field theory(χ -EFT) and optical potentials are consistent with Lattice-QCD calculations, over a wide momentum region. We also present NLD predictions for the in-medium momentum dependence of ∧¯, ∑¯ and Ξ¯ hyperons. This work is important for future experimental studies, like CBM, PANDA at FAIR and is relevant to nuclear astrophysics as well.

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29

Hrtankova, Jaroslava, and Jiří Mareš. "On the widths and binding energies of K− nuclear states and the role of K− multi-nucleon interactions." EPJ Web of Conferences 181 (2018): 01009. http://dx.doi.org/10.1051/epjconf/201818101009.

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We report on our recent self-consistent calculations of K− nuclear quasi-bound states using K− optical potentials derived from chirally motivated meson-baryon coupled channels models [1, 2]. The K− single-nucleon potentials were supplemented by a phenomenological K− multi-nucleon interaction term introduced to achieve good fits to K− atom data. We demonstrate a substantial impact of the K− multi-nucleon absorption on the widths of K− nuclear states. If such states ever exist in nuclear many-body systems, their widths are excessively large to allow observation.

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30

Ibraheem, Awad A., and Angela Bonaccorso. "Coulomb breakup effects on the optical potentials of weakly bound nuclei." Nuclear Physics A 748, no. 3-4 (February 2005): 414–32. http://dx.doi.org/10.1016/j.nuclphysa.2004.12.036.

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31

BOZTOSUN, I., O. BAYRAK, and Y. DAGDEMIR. "A COMPARATIVE STUDY OF THE 12C+24Mg SYSTEM WITH DEEP AND SHALLOW POTENTIALS." International Journal of Modern Physics E 14, no. 04 (June 2005): 663–73. http://dx.doi.org/10.1142/s0218301305003442.

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Studying nuclear reactions near the Coulomb barrier shows a number of problems which have remained unsolved for a long time: The out-of-phase problem between theoretical predictions and experimental data; the reproductions of the oscillatory structure near the Coulomb barrier; the consistent description of angular distributions together with the excitation functions data are just some of these problems. In order to address and overcome these problems, by considering a comparative study of the shallow and deep optical potentials, the elastic scattering angular distributions and excitation functions data of the 12 C +24 Mg reaction have been analyzed within the framework of the optical model over a wide energy range. The potential depths near the Coulomb barrier according to the increasing energy and threshold anomaly are discussed in terms of the shallow and deep potentials. Excellent agreement between theoretical results and measured data is obtained by using the optical model.

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32

KURKCUOGLU, M. E., H. AYTEKIN, and I. BOZTOSUN. "AN INVESTIGATION OF THE 16O+16O ELASTIC SCATTERING BY USING ALPHA–ALPHA DOUBLE FOLDING POTENTIAL IN OPTICAL MODEL FORMALISM." Modern Physics Letters A 21, no. 29 (September 21, 2006): 2217–32. http://dx.doi.org/10.1142/s0217732306020512.

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In this paper, a simultaneous analysis of the elastic scattering data of the 16 O +16 O system for the energy range 5–10 MeV/nucleon is performed theoretically within the framework of the optical model formalism, by using the α–α double folding cluster potential. The α–α double folding cluster potential is evaluated by using the α-cluster distribution densities in the usual nucleon–nucleon double folding process with an effective α–α interaction potential. The results of the α–α double folding cluster potential analysis are compared with the findings of the phenomenological Woods–Saxon squared and nucleon–nucleon double folding potentials. All potentials have exhibited a very good agreement with the experimental measurements for the elastic scattering angular distributions. Furthermore, it is shown that, the α–α double folding cluster potential and nucleon–nucleon double folding potential calculations provide very consistent results with each other. Thus, the 16 O+ 16 O system has been described by optical potentials having a deep real potential part and a weak absorptive imaginary potential part.

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33

Kelkar, Neelima G. "Distorted Pion Wave Function in the Pionic Decay of the Lightest Λ Hypernuclei." Modern Physics Letters A 12, no. 07 (March 7, 1997): 511–20. http://dx.doi.org/10.1142/s0217732397000534.

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The effect of pion distortions is studied in the π-mesonic decay [Formula: see text] of the lightest Λ hypernuclei. Reduction in the decay rates of both these nuclei is observed. This is in contrast to previous observations of enhancements in the decay rates of all nuclei ranging from [Formula: see text] to [Formula: see text]. The distorted wave function is evaluated using a theoretically deduced pion–nucleus optical potential. Calculations are also made using phenomenological optical potentials which fit the pion–nucleus scattering data quite well. Results with theoretical and phenomenological potentials are in fairly good agreement qualitatively, but the exact results are sensitive to the type of optical potential used.

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34

Gianturco, Franco A., and Raffaello Melissa. "Optical potentials for positron scattering: A simple modelling for atomic targets." Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 143, no. 1-2 (August 1998): 81–93. http://dx.doi.org/10.1016/s0168-583x(98)00369-3.

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35

KIM, YONG JOO, and MOON HOE CHA. "OPTICAL POTENTIALS BY INVERSION FOR 16O ION ELASTIC SCATTERINGS AT Elab=1503 MeV." International Journal of Modern Physics E 09, no. 04 (August 2000): 299–307. http://dx.doi.org/10.1142/s0218301300000210.

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The optical potentials by inversion are presented in two ways. The first one is to use the inverse eikonal relations derived from McIntyre phase shifts. The second one is to solve the inversion problem based on McIntyre parametrization of S-matrix corresponding to the Woods-Saxon type optical potentials. The optical potentials obtained from the two inversion methods are applied to the systems 16 O +12 C , 16 O +28 Si , and 16 O +40 Ca at E lab =1503 MeV . The calculated results are compared with those from the optical model analysis. It is shown that both the two methods lead to reasonable agreements, in the surface region, to the results from the optical model analysis.

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36

KHAN, SOHAIL A., M. Z. MAT JAFRI, and K. L. LOW. "QUASIMOLECULAR POTENTIAL WITH MODIFICATION." International Journal of Modern Physics E 19, no. 11 (November 2010): 2133–40. http://dx.doi.org/10.1142/s0218301310016557.

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Quasimolecular optical potentials used for identical nuclei have been modified for application to different interacting nuclei. This has been applied to the28Si –16O system and compared with those results using the Woods–Saxon potential that had been found to reproduce the experimental results. The result indicates that the modification is useful and provides information on nuclear properties and explains the origin of imaginary potential. It has the applicability to a wide range of nuclei.

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Basak, Dipali, and Chinmay Basu. "Wood–Saxon alpha potential for p-nuclei 106Cd and 113In." International Journal of Modern Physics E 28, no. 10 (October 2019): 1950090. http://dx.doi.org/10.1142/s0218301319500903.

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Alpha elastic scattering of [Formula: see text]-nuclei was studied for calculating optical potentials. Choice of the [Formula: see text]-optical potentials is important to measure the reaction rates of [Formula: see text]-process. [Formula: see text] and [Formula: see text] elastic scattering cross-section data were used to determine the potential parameter sets at [Formula: see text][Formula: see text]MeV for [Formula: see text] and [Formula: see text], 18.8[Formula: see text]MeV for [Formula: see text] system. A Wood–Saxon potential form factor is used for both real and imaginary parts. The potential parameters extracted in the present study exhibit a satisfactory result with respect to existing global potential parameters.

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38

HAIDER, W., and MANJARI SHARMA. "MICROSCOPIC LOCAL OPTICAL POTENTIALS AND THE NUCLEON–NUCLEUS SCATTERING AT 65 MeV." International Journal of Modern Physics E 19, no. 03 (March 2010): 465–82. http://dx.doi.org/10.1142/s021830131001487x.

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Microscopic local optical potentials from two sources were calculated by folding the numerical g-matrices over point proton and neutron RMF densities of target nuclei. The hard-core Hamada–Johnston and the soft-core Urbana v-14 local inter-nucleon potentials have been used to generate numerical g-matrices by solving Bethe–Goldstone integral equation. The calculated potentials have been used to analyze successfully both the proton and neutron differential elastic scattering and polarization data at 65 MeV over a wide mass region of targets: 12 C –208 Pb . Comparison of the present results with a phenomenological optical model analyzes is also presented. Mass number dependence of the mean square radii of the two microscopic potentials are in close agreement with each other as well as with empirical results.

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39

Ismail, M., M. Osman, H. El-Gibaly, and A. Faessler. "Proximity analysis of the optical potentials between (Pb+U) and (U+U) systems." Journal of Physics G: Nuclear and Particle Physics 15, no. 8 (August 1, 1989): 1291–303. http://dx.doi.org/10.1088/0954-3899/15/8/024.

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Lenzi, S. M., F. Zardi, and A. Vitturi. "Heavy-ion optical and polarization potentials at intermediate energies in a Glauber model." Nuclear Physics A 536, no. 1 (January 1992): 168–78. http://dx.doi.org/10.1016/0375-9474(92)90252-f.

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Aygun, M. "A Comparison of Proximity Potentials in the Analysis of Heavy-Ion Elastic Cross Sections." Ukrainian Journal of Physics 63, no. 10 (October 31, 2018): 881. http://dx.doi.org/10.15407/ujpe63.10.881.

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To obtain alternative nuclear potentials is very important in explaining the heavy-ion reactions, as well as light-ion ones. For this purpose, a comprehensive analysis of six different proximity potentials ([1, 9–12, 15]) is performed for the first time in the present study. In order to see the availability of the potentials, the elastic-scattering angular distributions of 40Ca by different target nuclei from 32S to 208Pb are calculated within the framework of the optical model. The theoretical results are compared with each other and with experimental data. The similarities and differences of the potentials are discussed, and some alternative potentials are proposed.

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Mahmoud, Zakaria M. M., Awad A. Ibraheem, and M. El-Azab Farid. "An investigation of p+8He elastic scattering." International Journal of Modern Physics E 23, no. 02 (February 2014): 1450008. http://dx.doi.org/10.1142/s0218301314500086.

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The vector analyzing power and differential cross-section for the elastic scattering of 8 He nucleus from polarized protons at 71 MeV/nucleon have been analyzed in the framework of the optical model potentials. Microscopic single folding (SF) optical potentials (OP) have been constructed based upon two different effective nucleon–nucleon (NN) interactions, namely Jeukenne–Lejeune–Mahaux (JLM) and BDM3Y1 effective interactions. The effect of 8 He nuclear structure has been tested through two different choices of the nuclear density distribution. It is concluded that the nucleus 8 He may be considered as a thick skin exotic nucleus. In order to investigate the vector analyzing power data, besides the Thomas phenomenological representation, three different forms of the spin–orbit (SO) part of the OP have been considered. These forms are based directly or indirectly upon the density distribution of 8 He nucleus. It is found that SO potentials of larger root mean square radii are able to successfully describe the vector analyzing power data more than those of shorter radii.

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CHIBA, Satoshi, and Masahide HARADA. "Applicability of Optical Model Potentials for Intermediate-Energy Nuclear Data Evaluations in the 1p-shell Mass Region." Journal of Nuclear Science and Technology 33, no. 4 (April 1996): 346–53. http://dx.doi.org/10.1080/18811248.1996.9731915.

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Ibraheem, Awad A., M. El-Azab Farid, Eman Abd El-Rahman, Zakaria M. M. Mahmoud, and Sherif R. Mokhtar. "Different folding models for 6Li+28Si elastic scattering." International Journal of Modern Physics E 29, no. 09 (September 2020): 2050075. http://dx.doi.org/10.1142/s0218301320500755.

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In this work, the elastic scattering of 6Li+[Formula: see text]Si system at wide range energies from 76 to 318[Formula: see text]MeV is analyzed. The analysis is carried out in the framework of the optical model (OM). Two different methods are adopted for nuclear optical potential of this system. The first method is the double folding cluster (DFC) for the real part supplied with an imaginary part in the Woods–Saxon (WS) form. In the second one, the double folding (DF) model based upon São Paulo potential (SPP) is used as real and imaginary parts each multiplied by a corresponding normalization factor. For [Formula: see text]Si, the full [Formula: see text]-cluster density is considered while the [Formula: see text]-deuteron ([Formula: see text]–[Formula: see text]) structure is considered for 6Li. Therefore, the DFC real central part is calculated by folding both [Formula: see text]–[Formula: see text] and [Formula: see text]–[Formula: see text] effective interaction between target and nuclei over the cluster densities of the target and projectile. The derived renormalized potentials give a successful description of the data. The present results are in good agreement with the previous work. This agreement confirms the validity of the present methods to generate nucleus–nucleus optical potentials.

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DENIKIN, A. S., V. I. ZAGREBAEV, and P. DESCOUVEMONT. "GENERALIZED OPTICAL POTENTIAL OF LIGHT WEAKLY BOUND CLUSTER NUCLEI." International Journal of Modern Physics E 17, no. 10 (November 2008): 2326–30. http://dx.doi.org/10.1142/s0218301308011550.

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A generalized optical potential for elastic scattering induced by light weakly bound nuclei is calculated within the Feshbach projection operator method. The model explicitly takes into account the contribution of the projectile break-up continuum treated within a microscopic cluster model. The model is tested on deuteron and 6Lielastic scattering by different targets at intermediate energies. The optical potentials are then calculated for the 6 He(230 MeV) +12Creaction treating the projectile nuclei within two (α + 2n) and three (α + n + n) cluster models. The differences are analyzed.

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ADHIKARI, SANDHAN K., and A. DELFINO. "COULOMB EFFECT IN THE TRINUCLEON SYSTEM IN AN OPTICAL POTENTIAL MODEL." International Journal of Modern Physics E 02, no. 03 (September 1993): 597–602. http://dx.doi.org/10.1142/s021830139300025x.

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A Saxon-Woods type nucleon-deuteron optical potential is suggested and applied numerically to the study of the static Coulomb effect in the low-energy trinucleon system. In particular, the observed correlations between the static Coulomb energy of 3He and the triton binding energy and that between the neutron-deuteron and the proton-deuteron scattering lengths are simulated with this optical potential, In view of this study and a previous one employing two other effective potentials, it is unlikely that a study of the usual static Coulomb effect in the trinucleon system will reveal new and meaningful physics.

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KRAVCHENKO, S. M., and A. P. SOZNIK. "POTENTIAL OF NUCLEON INTERACTION WITH ODD NUCLEI IN THE HARTREE-FOCK THEORY." International Journal of Modern Physics E 08, no. 02 (April 1999): 137–57. http://dx.doi.org/10.1142/s0218301399000112.

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An expression for the real part of the optical potential of nucleon interaction with odd nuclei is derived in the Hartree-Fock approximation with effective density-dependent nucleon-nucleon interaction. It is shown for 13 C nucleus, as an example, that this potential contains the central interaction, as well as two spin-orbit forces connected with the spins of scattered nucleon and nucleus, and quite strong spin-spin and tensor interactions. The simple analytical expressions have been obtained for these potentials. The radial distributions of the interactions obtained and their energy dependences are investigated. It is shown that all potentials differ for neutron and proton scattering while the spin-spin and tensor forces in both cases have opposite signs, complicated radial dependences and are the same by an order of magnitude on the nuclear surface.

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48

Timofeyuk, N. K. "Three-body problem with velocity-dependent optical potentials: a case of (d, p) reactions." Journal of Physics G: Nuclear and Particle Physics 46, no. 6 (April 25, 2019): 065103. http://dx.doi.org/10.1088/1361-6471/ab0992.

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49

KARAKOC, M., and I. BOZTOSUN. "MICROSCOPIC POTENTIAL DESCRIPTION OF THE ELASTIC SCATTERING AND FUSION CROSS-SECTION DATA OF THE 12C+24Mg SYSTEM." International Journal of Modern Physics E 15, no. 06 (September 2006): 1317–32. http://dx.doi.org/10.1142/s0218301306004867.

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This paper comprises the first detailed application of the microscopic potentials for a simultaneous analysis of the elastic scattering and fusion cross-section data of the 12 C+ 24Mg system from 16.0 MeV to 24.0 MeV. We use the microscopic nucleon-nucleon double folding and α-α double folding cluster potentials within the framework of the optical model and coupled-channels formalism. We compare our microscopic potential results with the findings of the phenomenological deep and shallow potentials. All potentials provide a very good agreement with the experimental data for the elastic scattering angular distributions. However, only deep phenomenological, the microscopic nucleon-nucleon and α-α double folding cluster potentials provide a consistent description of the angular distributions and fusion cross-section data simultaneously.

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Hu, Liyuan, Yushou Song, Yingwei Hou, and Huilan Liu. "The refractive scattering of 17F+12C." EPJ Web of Conferences 239 (2020): 03010. http://dx.doi.org/10.1051/epjconf/202023903010.

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The experimental data of the elastic scattering angular distribution of 17F+12C at 170 MeV is analyzed by the continuum-discretized coupled channels (CDCC) method and the optical model (OM). In the CDCC calculation, the unambiguous optical potential of 16O+12C is used as the input to give the coupling potentials. A very refractive feature is found and two evident Airy minima are predicted at large angles. The one-channel calculation is also performed and gives nearly the same result. In the OM calculations, this optical potential of 16O+12C is used again and adjusted to reproduce the angular distribution of 17F+12C. The Airy oscillation appears again in the calculated angular distribution. These results indicate that the elastic scattering of 17F+12C at 170 MeV has the possibility of the nuclear rainbow phenomenon, which is probably due to the contribution from the 16O core.

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