Interaction of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>He</mml:mi><mml:mprescripts/><mml:none/><mml:mn>8</mml:mn></mml:mmultiscripts></mml:math> with <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Pb</mml:mi><mml:mprescripts/><mml:none/><mml:mn>208</mml:mn></mml:mmultiscripts></mml:math> at near-barrier energies: <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>He</mml:mi><mml:mprescripts/><mml:none/><mml:mn>4</mml:mn></mml:mmultiscripts></mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>He</mml:mi><mml:mprescripts/><mml:none/><mml:mn>6</mml:mn></mml:mmultiscripts></mml:math> production
G. Marquínez-DuránScience and Technology Research Centre (STRC), University of Huelva, 21071 Huelva, SpainI. MartelScience and Technology Research Centre (STRC), University of Huelva, 21071 Huelva, SpainÁ. M. Sánchez-BenítezDepartamento de Ciencias Integradas y Centro de Estudios Avanzados en Física, Matemáticas y Computación,L. AcostaInstituto de Fsica, Universidad Nacional Autnoma de Mxico, A.P. 20-364, Distrito Federal 01000, MexicoJ. AguadoScience and Technology Research Centre (STRC), University of Huelva, 21071 Huelva, SpainR. BerjillosScience and Technology Research Centre (STRC), University of Huelva, 21071 Huelva, SpainAbreu PintoScience and Technology Research Centre (STRC), University of Huelva, 21071 Huelva, SpainThor GarciaScience and Technology Research Centre (STRC), University of Huelva, 21071 Huelva, SpainJ. A. DueñasDepartamento Ingeniería Eléctrica y Centro de Estudios Avanzados en Física, Matemáticas y Computación, Universidad de Huelva, 21071 Huelva, SpainК. RusekHeavy Ion Laboratory, University of Warsaw, ul. Pasteura 5a, 02-093 Warsaw, PolandN. KeeleyNational Centre for Nuclear Research, ul. Andrzeja Sotana 7, 05-400 Otwock, PolandK. W. KemperDepartment of Physics, Florida State University, Tallahassee, Florida 32306, USAM. A. G. ÁlvarezDepartamento de Física Atómica, Molecular y Nuclear, Universidad de Sevilla, 41080 Seville, SpainM. J. G. BorgeInstituto de Estructura de la Materia, CSIC, 28006 Madrid, SpainA. ChbihiGANIL, CEA and IN2P3-CNRS, B.P. 5027, 14076 Caen Cedex, FranceCarlos CruzInstituto de Estructura de la Materia, CSIC, 28006 Madrid, SpainM. CuberoInstituto de Estructura de la Materia, CSIC, 28006 Madrid, SpainJ. P. Fernández-GarcíaDepartamento de Física Atómica, Molecular y Nuclear, Universidad de Sevilla, 41080 Seville, SpainB. FernándezCentro Nacional de Aceleradores (Universidad de Sevilla, Junta de Andalucía,J.L. FloresDepartamento de Ingeniera Elctrica, Universidad de Huelva, 21071 Huelva, SpainJ. Gómez‐CamachoCSIC), 41092 Seville, SpainJ.A. LabradorCSIC), 41092 Seville, SpainF. M. MarquésLPCC - Laboratoire de physique corpusculaire de Caen (ENSICAEN - 6, boulevard du Marechal Juin 14050 Caen Cedex - France)A. M. MoroDepartamento de Fsica Atmica, Molecular y Nuclear, Universidad de Sevilla, 41080 Seville, SpainM. MazzoccoDipartimento di Fisica and INFN, Universit di Padova, 35131 Padova, ItalyA. PakouDepartment of Physics and HINP, University of Ioannina, 45110 Ioannina, GreeceV. V. ParkarScience and Technology Research Centre (STRC), University of Huelva, 21071 Huelva, SpainN. PatronisDepartment of Physics and HINP, University of Ioannina, 45110 Ioannina, GreeceV. PesudoInstituto de Estructura de la Materia, CSIC, 28006 Madrid, SpainD. PierroutsakouINFN -Sezione di Napoli, Via Cintia, 80126 Napoli, ItalyR. RaabeKU Leuven, Intituut voor Kern-en Stralingsfysica, Celestijnenlaan 200D, 3001 Leuven, BelgiumRiccardo SilvestriINFN -Sezione di Napoli, Via Cintia, 80126 Napoli, ItalyN. SoićRudjer Bošković Institute, Bijenicka 54, 10000 Zagreb, CroatiaŁ. StandyłoHeavy Ion Laboratory, University of Warsaw, ul. Pasteura 5a, 02-093 Warsaw, PolandI. StrojekNational Centre for Nuclear Research, ul. Andrzeja Sotana 7, 05-400 Otwock, PolandO. TengbladInstituto de Estructura de la Materia, CSIC, 28006 Madrid, SpainR. WolskiFlerov Laboratory of Nuclear Reactions, JINR, Dubna 141980, RussiaZ. Abou-HaïdarCSIC), 41092 Seville, Spain
ABI
Аннотация
Angular distributions for the inclusive $^{4}\mathrm{He}$ and $^{6}\mathrm{He}$ production cross sections in the $^{8}\mathrm{He}+^{208}\mathrm{Pb}$ system at incident energies of 16 and 22 MeV measured at the SPIRAL facility of the GANIL laboratory are presented. Using a combination of kinematical arguments and distorted wave Born approximation (DWBA) calculations, neutron transfer reactions were inferred to be the dominant contributors to both inclusive cross sections. Model-dependent values for the ratios of two- to one-neutron stripping, ${\ensuremath{\sigma}}_{2n}/{\ensuremath{\sigma}}_{1n}$, were derived and compared with previous results for $^{8}\mathrm{He}$ and $^{6}\mathrm{He}$ projectiles incident on other heavy targets. Three- and four-neutron stripping were inferred to be the main processes leading to $^{4}\mathrm{He}$ production, although the exact mechanism remains to be elucidated.
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