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117 results on '"Carlson B.V."'

1. A theoretical study of deuteron-induced surrogate reactions

Author

Carlson B.V., Capote R., and Sin M.

Subjects
Physics, QC1-999
Abstract

We use the zero-range post-form DWBA approximation to calculate deuteron elastic and nonelastic breakup cross sections and estimate the breakup-fusion cross section that could serve as a surrogate for a neutron-induced reaction cross section. We compare the angular momentum dependence of the breakup-fusion compound nucleus formation cross section with that of the corresponding neutron-induced cross section.

Published
2017
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2. Formation and decay of a hot compound nucleus

Author

Carlson B.V., Dalmolin F.T., Dutra M., Santos T.J., Souza S.R., and Donangelo R.

Subjects
Physics, QC1-999
Abstract

The compound nucleus plays an important role in nuclear reactions over a wide range of projectile-target combinations and energies. The limits that angular momentum places on its formation and existence are, for the most part, well understood. The limits on its excitation energy are not as clear. Here we first analyze general geometrical and thermodynamical features of a hot compound nucleus. We then discuss the manners by which it can decay and close by speculating on the high energy limit to its formation and existence.

Published
2014
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3. Study of Ground State Wave-function of the Neutron-rich 29,30Na Isotopes through Coulomb Breakup

Author

Rahaman A., Datta Pramanik U., Aumann T., Beceiro S., Boretzky K., Caesar C., Carlson B.V., Catford W.N., Chakraborty S., Chatterjee S., Chartier M., Angelis G.De., Cortina-Gil D., Gonzalez-Diaz D., Emling H., Diaz Fernandez P., Fraile L.M., Ershova O., Geissel H., Heil M., Jonson B., Kelic A., Johansson H., Kruecken R., Kroll T., Kurcewicz J., Langer C., Bleis T.Le, Leifels Y., Munzenberg G., Marganiec J., Nociforo C., Najafi A., Panin V., Paschalis S., Pietri S., Plag R., Reifarth R., Ricciardi V., Rossi D., Ray J., Simon H., Scheidenberge C., Typel S., Taylor J., Togano Y., Volkov V., Weick H., Wagner A., Wamers F., Weigand M., Winfield J.S., Yakorev D., and Zoric M.

Subjects
Physics, QC1-999
Abstract

Coulomb breakup of unstable neutron rich nuclei 29,30Na around the ‘island of inversion’ has been studied at energy around 434 MeV/nucleon and 409 MeV/nucleon respectively. Four momentum vectors of fragments, decay neutron from excited projectile and γ-rays emitted from excited fragments after Coulomb breakup are measured in coincidence. For these nuclei, the low-lying dipole strength above one neutron threshold can be explained by direct breakup model. The analysis for Coulomb breakup of 29,30Na shows that large amount of the cross section yields the 28Na, 29Na core in ground state. The predominant ground-state configuration of 29,30Na is found to be 28Na(g.s)⊗νs1/2 and 29Na(g.s)⊗νs1/2,respectively.

Published
2014
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4. Ground-state configuration of neutron-rich Aluminum isotopes through Coulomb Breakup

Author

Chakraborty S., Pramanik U. Datta, Aumann T., Beceiro S., Boretzky K., Caesar C., Carlson B.V., Catford W. N., Chatterjee S., Chartier M ., Cortina-Gil D., Angelis G.De., Gonzalez-Diaz D., Emling H., Fernandez P. Diaz, Fraile L. M., Ershova O., Geissel H., Heil M., Jonson B., Kelic A., Johansson H., Kruecken R., Kroll T., Kurcewicz J., Langer C., Bleis T. Le, Leifels Y., Munzenberg G., Marganiec J., Nociforo C., Najafi A., Panin V., Paschalis S., Pietri S., Plag R., Rahaman A., Reifarth R., Ricciardi V., Rossi D., Ray J., Simon H., Scheidenberger C., Typel S., Taylor J., Togano Y., Volkov V., Weick H., Wagner A., Wamers F., Weigand M., Winfield J. S., Yakorev D., and Zoric M.

Subjects
Physics, QC1-999
Abstract

Neutron-rich 34,35Al isotopes have been studied through Coulomb excitation using LAND-FRS setup at GSI, Darmstadt. The method of invariant mass analysis has been used to reconstruct the excitation energy of the nucleus prior to decay. Comparison of experimental CD cross-section with direct breakup model calculation with neutron in p3/2 orbital favours 34Al(g.s)⊗νp3/2 as ground state configuration of 35Al. But ground state configuration of 34Al is complicated as evident from γ-ray spectra of 33Al after Coulomb breakup of 34Al.

Published
2014
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5. Bound state densities and the Helmholtz free energy

Author

Souza S.R., Donangelo R., Carlson B.V., Dutra M., and Dalmolin F.T.

Subjects
Physics, QC1-999
Abstract

Bohr's conception of the compound nucleus is based on the idea of ‘longlived’ nuclear states in which all single particles are bound. We briefly discuss the properties of the density of bound states and then use two prescriptions, that of Brack and Quentin and that of Bonche, Levit e Vautherin to calculate the equivalent temperaturedependent quantity – the Helmholtz free energy.We compare the temperature dependence of the latter, as well as that of the excitation energy and entropy, obtained using the two prescriptions in self-consistent calculations within the relativistic Hartree and Skyrme models. We then discuss the extended, temperature-dependent liquid-drop approximation to the excitation and free energies obtained from fits to the self-consistent calculations over a wide range of charge and mass numbers.

Published
2012
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6. The density of available states of the DDHMS pre-equilibrium model

Author

Mega D.F. and Carlson B.V.

Subjects
Physics, QC1-999
Abstract

Griffin's exciton model of pre-equilibrium emission and Blann's hybrid model have proven extremely successful in describing the energy dependence and, to a certain extent the angular dependence, of nucleon and composite particle emission in preequilibrium reactions. However, the conceptual basis of these models was called into question by Bisplinghoff already some time ago. In response to Bisplinghoff, Blann proposed the hybrid Monte Carlo simulation model (HMS), which uses only the densities of available states for creation and decay of single particle-hole pairs. The model was later extended, in collaboration with Chadwick, to the double-differential HMS, which we call the DDHMS. This extension is based on the Chadwick-Obložinský prescription for pproximating the energy-angular distribution of available two-particle-one-hole states. Here, we show how this distribution can be calculated exactly.

Published
2012
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20. Recommended Nuclear Data for the Production of Selected Therapeutic Radionuclides

Author

Engle, Jonathan W, Ignatyuk, Anatoly V, Capote, Roberto, Carlson, B.V., Hermanne, Alex, Kellett, Mark A, Kibedi, Tibor, Kim, Guinyun, Kondev, Filip G, Hussain, Mazhar, Lebeda, Ondřej, Engle, Jonathan W, Ignatyuk, Anatoly V, Capote, Roberto, Carlson, B.V., Hermanne, Alex, Kellett, Mark A, Kibedi, Tibor, Kim, Guinyun, Kondev, Filip G, Hussain, Mazhar, and Lebeda, Ondřej

Abstract

Increasing interest in the treatment of human disease by means of targeted radionuclide-based therapies requires an accurate understanding of achievable yields and quantification of realisable degrees of purity. Important studies within a more extensive Coordinated Research Project of the International Atomic Energy Agency (IAEA CRP) have included in-depth assessments and evaluations of all available measured cross-section data for ten nuclear reactions leading to the formation of 131Cs, 131Ba, 225Ac, 225Ra, 227Th, 227Ac, 230U and 230Pa for various on-going and proposed therapeutic applications in nuclear medicine. Equivalent studies were also undertaken of possible reactions to produce the 178W/low-spin 178mTa generator system that has been clinically applied in diagnosis by means of SPECT - these particular cross-section studies and recommendations are included in this paper for completeness. All available measured data have been critically reviewed and assessed to produce statistically consistent datasets. Selected datasets have been fitted by a least-squares method with Padé approximations of variable order to evaluate the production cross sections and corresponding uncertainties. New measurements have been made in some instances, and reported data have been adjusted to accommodate new nuclear decay or monitor reaction data which altered the original reported quantities adversely. Insufficient measured data are available in many cases to permit a reliable evaluation of cross sections, and these instances are discussed. Recommended therapeutic radionuclide production reaction data and their uncertainties are available on the Web page of the IAEA Nuclear Data Section at www-nds.iaea.org/radionuclides/ and also at the IAEA medical portal www-nds.iaea.org/medportal/.

Published
2019

25. Determination of the cosmic-ray-induced neutron flux and ambient dose equivalent at flight altitude

Author

Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Pazianotto, Maurício T., Cortés Giraldo, Miguel Antonio, Federico, C.A, Gonçalez, O.L., Quesada Molina, José Manuel, Carlson, B.V., Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Pazianotto, Maurício T., Cortés Giraldo, Miguel Antonio, Federico, C.A, Gonçalez, O.L., Quesada Molina, José Manuel, and Carlson, B.V.

Abstract

There is interest in modeling the atmosphere in the South Atlantic Magnetic Anomaly in order to obtain information about the cosmic-ray induced neutron spectrum and angular distribution as functions of altitude. In this work we use the Monte Carlo codes MCNPX and Geant4 to determine the cosmic-ray-induced neutron flux in the atmosphere produced by the cosmic ray protons incident on the top of the atmosphere and to estimate the ambient dose equivalent rate as function of altitude. The results present a reasonable conformity to other codes (QARM and EXPACS) based on other parameterizations.

Published
2015

26. Study of Ground State Wave-function of the Neutron-rich29,30Na Isotopes through Coulomb Breakup

Author

Rahaman, A., primary, Datta Pramanik, U., additional, Aumann, T., additional, Beceiro, S., additional, Boretzky, K., additional, Caesar, C., additional, Carlson, B.V., additional, Catford, W.N., additional, Chakraborty, S., additional, Chatterjee, S., additional, Chartier, M., additional, Angelis, G.De., additional, Cortina-Gil, D., additional, Gonzalez-Diaz, D., additional, Emling, H., additional, Diaz Fernandez, P., additional, Fraile, L.M., additional, Ershova, O., additional, Geissel, H., additional, Heil, M., additional, Jonson, B., additional, Kelic, A., additional, Johansson, H., additional, Kruecken, R., additional, Kroll, T., additional, Kurcewicz, J., additional, Langer, C., additional, Bleis, T.Le, additional, Leifels, Y., additional, Munzenberg, G., additional, Marganiec, J., additional, Nociforo, C., additional, Najafi, A., additional, Panin, V., additional, Paschalis, S., additional, Pietri, S., additional, Plag, R., additional, Reifarth, R., additional, Ricciardi, V., additional, Rossi, D., additional, Ray, J., additional, Simon, H., additional, Scheidenberge, C., additional, Typel, S., additional, Taylor, J., additional, Togano, Y., additional, Volkov, V., additional, Weick, H., additional, Wagner, A., additional, Wamers, F., additional, Weigand, M., additional, Winfield, J.S., additional, Yakorev, D., additional, and Zoric, M., additional

Published
2014
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27. Consistent analysis of fusion data without adjustable parameters for a wide variety of heavy-ion systems

Author

Nobre, G.P.A., Chamon, L C, Gasques , Leandro, Carlson, B.V., Thompson, I.J., Nobre, G.P.A., Chamon, L C, Gasques , Leandro, Carlson, B.V., and Thompson, I.J.

Abstract

We have calculated fusion cross sections for 64 heavy-ion systems based on a method that takes into account the couplings to a complete set of states for surface vibrations of the nuclear densities. For the nuclear interaction we have assumed the parameter-free São Paulo potential. The predictions have been obtained without using any adjustable parameter, and are in good agreement with the experimental results for most of the systems, even at sub-barrier energies.

Published
2007

28. Tunnelling through a parabolic barrier coupled to an oscillatory degree of freedom: Application to heavy-ion fusion at sub-barrier energies

Author

Nobre, G.P.A., Chamon, L C, Carlson, B.V., Thompson, I.J., Gasques , Leandro, Nobre, G.P.A., Chamon, L C, Carlson, B.V., Thompson, I.J., and Gasques , Leandro

Abstract

We performed studies of the transmission through a parabolic barrier coupled to a harmonic oscillator degree of freedom. We propose a model to include the effects of the excitation energy in a context similar to that of the frozen approximation. The model results in accurate approximations for the transmission coefficient and it is tested in the description of the heavy-ion fusion.

Published
2007

32. Renormalization of the ladder light-front Bethe-Salpeter equation in the Yukawa model

Author

Sales, J.H.O., Frederico, T., Carlson, B.V., Sauer, Peter Ulrich, Sales, J.H.O., Frederico, T., Carlson, B.V., and Sauer, Peter Ulrich

Abstract

The reduction of the two-fermion Bethe-Salpeter equation in the framework of light-front dynamics is studied for the Yukawa model. It yields auxiliary three-dimensional quantities for the transition matrix and the bound state. The arising effective interaction can be perturbatively expanded in powers of the coupling constant gs allowing a defined number of boson exchanges; it is divergent and needs renormalization; it also includes the instantaneous term of the Dirac propagator. One possible solution of the renormalization problem of the boson exchanges is shown to be provided by expanding the effective interaction beyond single boson exchange. The effective interaction in ladder approximation up to order g4s is discussed in detail. It is shown that the effective interaction naturally yields the “box counterterm” required to be introduced ad hoc previously. The covariant results of the Bethe-Salpeter equation can be recovered from the corresponding auxiliary three-dimensional quantities.

Published
2001

33. Light-front Bethe-Salpeter equation

Author

Sales, J.H.O., Frederico, T., Carlson, B.V., Sauer, Peter Ulrich, Sales, J.H.O., Frederico, T., Carlson, B.V., and Sauer, Peter Ulrich

Abstract

A three-dimensional reduction of the two-particle Bethe-Salpeter equation is proposed. The proposed reduction is in the framework of light-front dynamics. It yields auxiliary quantities for the transition matrix and the bound state. The arising effective interaction can be perturbatively expanded according to the number of particles exchanged at a given light-front time. An example suggests that the convergence of the expansion is rapid. This result is particular for light-front dynamics. The covariant results of the Bethe-Salpeter equation can be recovered from the corresponding auxiliary three-dimensional ones. The technical procedure is developed for a two-boson case; the idea for an extension to fermions is given. The technical procedure appears quite practicable, possibly allowing one to go beyond the ladder approximation for the solution of the Bethe-Salpeter equation. The relation between the three-dimensional light-front reduction of the field-theoretic Bethe-Salpeter equation and a corresponding quantum-mechanical description is discussed.

Published
2000

39. Coulomb breakup of 23O

Author

Nociforo, C., primary, Jones, K.L., additional, Khiem, L.H., additional, Adrich, P., additional, Aumann, T., additional, Carlson, B.V., additional, Cortina-Gil, D., additional, Datta Pramanik, U., additional, Elze, Th.W., additional, Emling, H., additional, Geissel, H., additional, Hellström, M., additional, Kratz, J.V., additional, Kulessa, R., additional, Lange, T., additional, Leifels, Y., additional, Lenske, H., additional, Lubkiewicz, E., additional, Münzenberg, G., additional, Palit, R., additional, Scheit, H., additional, Simon, H., additional, Sümmerer, K., additional, Typel, S., additional, Wajda, E., additional, Walus, W., additional, and Weick, H., additional

Published
2005
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43. Reaction cross section and matter radius measurements of proton-rich Ga, Ge, As, Se and Br nuclides

Author

Lima, G.F., primary, Lépine-Szily, A., additional, Villari, A.C.C., additional, Mittig, W., additional, Lichtenthäler, R., additional, Chartier, M., additional, Orr, N.A., additional, Angélique, J.C., additional, Audi, G., additional, Baldini-Neto, E., additional, Carlson, B.V., additional, Casandjian, J.M., additional, Cunsolo, A., additional, Donzaud, C., additional, Foti, A., additional, Gillibert, A., additional, Hirata, D., additional, Lewitowicz, M., additional, Lukyanov, S., additional, MacCormick, M., additional, Morrissey, D.J., additional, Ostrowski, A.N., additional, Sherrill, B.M., additional, Stephan, C., additional, Suomijärvi, T., additional, Tassan-Got, L., additional, Vieira, D.J., additional, and Wouters, J.M., additional

Published
2004
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46. GROUND-STATE CONFIGURATION OF THE NEUTRON-RICH 11BE AND 17,19,21,23O NUCLEI STUDIED BY COULOMB BREAKUP

Author

PALIT, R., primary, AUMANN, T., additional, BORETZKY, K., additional, CARLSON, B.V., additional, CORTINA, D., additional, PRAMANIK, U. DATTA, additional, ELZE, TH.W., additional, EMLING, H., additional, GEISSEL, H., additional, GRÜNSCHLOß, A., additional, HELLSTRÖM, M., additional, ILIEVSKI, S., additional, IWASA, N., additional, JONES, K.L., additional, KHIEM, L.H., additional, KRATZ, J.V., additional, KULESSA, R., additional, LEIFELS, Y., additional, LEISTENSCHNEIDER, A., additional, LUBKIEWICZ, E., additional, MÜNZENBERG, G., additional, NOCIFORO, C., additional, REITER, P., additional, SCHEIDENBERGER, C., additional, SIMON, H., additional, SÜMMERER, K., additional, WAJDA, E., additional, and WALUS, W., additional

Published
2003
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49. Fragmentation of exotic oxygen isotopes

Author

Leistenschneider, A., primary, Aumann, T., additional, Boretzky, K., additional, Canto, L.F., additional, Carlson, B.V., additional, Cortina, D., additional, Datta Pramanik, U., additional, Elze, Th.W., additional, Emling, H., additional, Geissel, H., additional, Grünschloss, A., additional, Helariutta, K., additional, Hellström, M., additional, Hussein, M.S., additional, Ilievski, S., additional, Jones, K., additional, Kratz, J.V., additional, Kulessa, R., additional, Le Hong, Khiem, additional, Lubkiewicz, E., additional, Münzenberg, G., additional, Palit, R., additional, Reiter, P., additional, Scheidenberger, C., additional, Schmidt, K.-H., additional, Simon, H., additional, Sümmerer, K., additional, Wajda, E., additional, and Walús, W., additional

Published
2003
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50. Coulomb breakup of the neutron-rich isotopes 15C and 17C

Author

Datta Pramanik, U, primary, Aumann, T, additional, Boretzky, K, additional, Carlson, B.V, additional, Cortina, D, additional, Elze, Th.W, additional, Emling, H, additional, Geissel, H, additional, Grünschloß, A, additional, Hellström, M, additional, Ilievski, S, additional, Kratz, J.V, additional, Kulessa, R, additional, Leifels, Y, additional, Leistenschneider, A, additional, Lubkiewicz, E, additional, Münzenberg, G, additional, Reiter, P, additional, Simon, H, additional, Sümmerer, K, additional, Wajda, E, additional, and Walus, W, additional

Published
2003
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