Abstract:Elastic scattering and breakup angular distributions of the weakly bound radioactive nucleus 8 B on a 208 Pb target at an incident energy of 238 MeV, which corresponds to four times the Coulomb barrier, have been measured at the HIRFL-RIBLL facility (Institute of Modern Physics, Lanzhou). The data have been analyzed using the optical model and the continuum discretized coupled channels (CDCC) formalism. The measured and calculated elastic scattering angular distributions do not show any significant Coulomb rai… Show more
“…Halo nuclei can be found for many different isotopic chains, both at the neutron-rich limit as well as the proton-rich extreme. For example, in the Carbon isotopic chain, one finds the exotic 9 C [2] in the proton-rich side and the two-neutron halo 22 C [3][4][5] on the neutron dripline; in the Boron isotopic chain, while 8 B exhibits a well studied proton halo (e.g., [6][7][8]), 19 B has a neutron halo [9,10].…”
Breakup reactions are one of the favored probes to study loosely bound nuclei, particularly those in the limit of stability forming a halo. In order to interpret such breakup experiments, the continuum discretized coupled channel method is typically used. In this study, the first Bayesian analysis of a breakup reaction model is performed. We use a combination of statistical methods together with a three-body reaction model (the continuum discretized coupled channel method) to quantify the uncertainties on the breakup observables due to the parameters in the effective potential describing the loosely bound projectile of interest. The combination of tools we develop opens the path for a Bayesian analysis of not only breakup processes, but also a wide array of complex processes that require computationally intensive reaction models.
“…Halo nuclei can be found for many different isotopic chains, both at the neutron-rich limit as well as the proton-rich extreme. For example, in the Carbon isotopic chain, one finds the exotic 9 C [2] in the proton-rich side and the two-neutron halo 22 C [3][4][5] on the neutron dripline; in the Boron isotopic chain, while 8 B exhibits a well studied proton halo (e.g., [6][7][8]), 19 B has a neutron halo [9,10].…”
Breakup reactions are one of the favored probes to study loosely bound nuclei, particularly those in the limit of stability forming a halo. In order to interpret such breakup experiments, the continuum discretized coupled channel method is typically used. In this study, the first Bayesian analysis of a breakup reaction model is performed. We use a combination of statistical methods together with a three-body reaction model (the continuum discretized coupled channel method) to quantify the uncertainties on the breakup observables due to the parameters in the effective potential describing the loosely bound projectile of interest. The combination of tools we develop opens the path for a Bayesian analysis of not only breakup processes, but also a wide array of complex processes that require computationally intensive reaction models.
“…A calibração dos espectros de energia foi realizada com os feixes secundários. Com os sinais de rigidez magnética (Bρ), as energias dos feixes secundários tais como 13 B, 14 C, 13 N e outros podem ser calculadas. Nas figuras 3.2 -3.4 mostramos os espectros biparamétricos calibrados.…”
Section: Espectro De 13 Nunclassified
“…• Potencial core-valence ( 11 Be, conforme a Ref. [15], que é um núcleo rico em nêutron, mas não para o 8 B que é um núcleo rico em prótons [14]. Para os cálculos de expansão multipolar λ, esses acoplamentos também tiveram influência na seção de choque de one-channel.…”
Section: Cálculo De Cdcc Para O Sistema 13 B+ 208 Pbunclassified
“…Foi observado que um dos efeitos do canal de breakup na distribuição angular de espalhamento elástico é o forte amortecimento do pico de Fresnel e uma alta seção de choque de reação nas medidas em energias próximas a barreira Coulombiana. Esse efeito foi claramente observado para o núcleo 8 B, que possui uma configuração cluster de 7 Be+p com energia de ligação muito baixa, (Sp= 0,138 MeV) [9][10][11][12][13][14]. Recentemente, esse forte amortecimento foi também observado em medidas de espalhamento elástico de 11 Be em alvo de 208 Pb, para uma energia três vezes a barreira Coulombiana (VB = 39.5 MeV) [15].…”
Section: Introductionunclassified
“…xviii Figura 5.46: Esquema do acoplamento target overlaps -projectil overlaps usado no cálculo de CRC de 1p para a reação 208 Pb( 13 C, 14 N) 207 Tl. 88 Figura 5.47: Esquema do acoplamento target overlaps -projectil overlaps usado no cálculo de CRC de 1n para a reação 208 Pb( 13 C, 12 C) 209 Pb.…”
Em primeiro lugar agradeço a meus pais, Oscar e Celia, a minha irmã Sharon, e o Boxi, pelo apoio total nesta etapa acadêmica.Agradeço a meu orientador Prof. Dr. Valdir Guimaraes, pela orientação, paciência e as sugestões brindadas na tese.
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