Low-lying dipole response in the relativistic quasiparticle time blocking approximation and its influence on neutron capture cross sections

E. Litvinova; H. P. Loens; K. Langanke; G. Martinez-Pinedo; T. Rauscher; P. Ring; Friedrich-Karl Thielemann; V. Tselyaev

doi:10.1016/j.nuclphysa.2009.03.009

Low-lying dipole response in the relativistic quasiparticle time blocking approximation and its influence on neutron capture cross sections

E. Litvinova, H. P. Loens, K. Langanke, G. Martinez-Pinedo, T. Rauscher, P. Ring, Friedrich-Karl Thielemann, V. Tselyaev

Centre for Astrophysics Research (CAR)

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Abstract

We have computed dipole strength distributions for nickel and tin isotopes within the Relativistic Quasiparticle Time Blocking Approximation (RQTBA). These calculations provide a good description of data, including the neutron-rich tin isotopes (130.132)Sn. The resulting dipole strengths have been implemented in Hauser-Feshbach calculations of astrophysical neutron capture rates relevant for r-process nucleosynthesis studies. The RQTBA calculations show the presence of enhanced dipole strength at energies around the neutron threshold for neutron rich nuclei. The computed neutron capture rates are sensitive to the fine structure of the low lying dipole strength. which emphasizes the importance of a reliable knowledge of this excitation mode. (C) 2009 Elsevier B.V. All rights reserved.

Original language	English
Pages (from-to)	26-37
Number of pages	12
Journal	Nuclear Physics A
Volume	823
Issue number	1-4
DOIs	https://doi.org/10.1016/j.nuclphysa.2009.03.009
Publication status	Published - 15 May 2009

Keywords

STRENGTH FUNCTIONS
Astrophysical reaction rates
Neutron capture
R-PROCESS
r-process
LEVEL DENSITIES
Relativistic many-body theory
ASTROPHYSICAL REACTION-RATES
MODEL-CALCULATIONS
NUCLEI
Hauser-Feshbach theory
PHOTONS

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title = "Low-lying dipole response in the relativistic quasiparticle time blocking approximation and its influence on neutron capture cross sections",

abstract = "We have computed dipole strength distributions for nickel and tin isotopes within the Relativistic Quasiparticle Time Blocking Approximation (RQTBA). These calculations provide a good description of data, including the neutron-rich tin isotopes (130.132)Sn. The resulting dipole strengths have been implemented in Hauser-Feshbach calculations of astrophysical neutron capture rates relevant for r-process nucleosynthesis studies. The RQTBA calculations show the presence of enhanced dipole strength at energies around the neutron threshold for neutron rich nuclei. The computed neutron capture rates are sensitive to the fine structure of the low lying dipole strength. which emphasizes the importance of a reliable knowledge of this excitation mode. (C) 2009 Elsevier B.V. All rights reserved.",

keywords = "STRENGTH FUNCTIONS, Astrophysical reaction rates, Neutron capture, R-PROCESS, r-process, LEVEL DENSITIES, Relativistic many-body theory, ASTROPHYSICAL REACTION-RATES, MODEL-CALCULATIONS, NUCLEI, Hauser-Feshbach theory, PHOTONS",

author = "E. Litvinova and Loens, {H. P.} and K. Langanke and G. Martinez-Pinedo and T. Rauscher and P. Ring and Friedrich-Karl Thielemann and V. Tselyaev",

year = "2009",

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doi = "10.1016/j.nuclphysa.2009.03.009",

language = "English",

volume = "823",

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journal = "Nuclear Physics A",

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T1 - Low-lying dipole response in the relativistic quasiparticle time blocking approximation and its influence on neutron capture cross sections

AU - Litvinova, E.

AU - Loens, H. P.

AU - Langanke, K.

AU - Martinez-Pinedo, G.

AU - Rauscher, T.

AU - Ring, P.

AU - Thielemann, Friedrich-Karl

AU - Tselyaev, V.

PY - 2009/5/15

Y1 - 2009/5/15

N2 - We have computed dipole strength distributions for nickel and tin isotopes within the Relativistic Quasiparticle Time Blocking Approximation (RQTBA). These calculations provide a good description of data, including the neutron-rich tin isotopes (130.132)Sn. The resulting dipole strengths have been implemented in Hauser-Feshbach calculations of astrophysical neutron capture rates relevant for r-process nucleosynthesis studies. The RQTBA calculations show the presence of enhanced dipole strength at energies around the neutron threshold for neutron rich nuclei. The computed neutron capture rates are sensitive to the fine structure of the low lying dipole strength. which emphasizes the importance of a reliable knowledge of this excitation mode. (C) 2009 Elsevier B.V. All rights reserved.

AB - We have computed dipole strength distributions for nickel and tin isotopes within the Relativistic Quasiparticle Time Blocking Approximation (RQTBA). These calculations provide a good description of data, including the neutron-rich tin isotopes (130.132)Sn. The resulting dipole strengths have been implemented in Hauser-Feshbach calculations of astrophysical neutron capture rates relevant for r-process nucleosynthesis studies. The RQTBA calculations show the presence of enhanced dipole strength at energies around the neutron threshold for neutron rich nuclei. The computed neutron capture rates are sensitive to the fine structure of the low lying dipole strength. which emphasizes the importance of a reliable knowledge of this excitation mode. (C) 2009 Elsevier B.V. All rights reserved.

KW - STRENGTH FUNCTIONS

KW - Astrophysical reaction rates

KW - Neutron capture

KW - R-PROCESS

KW - r-process

KW - LEVEL DENSITIES

KW - Relativistic many-body theory

KW - ASTROPHYSICAL REACTION-RATES

KW - MODEL-CALCULATIONS

KW - NUCLEI

KW - Hauser-Feshbach theory

KW - PHOTONS

U2 - 10.1016/j.nuclphysa.2009.03.009

DO - 10.1016/j.nuclphysa.2009.03.009

M3 - Article

SN - 0375-9474

VL - 823

SP - 26

EP - 37

JO - Nuclear Physics A

JF - Nuclear Physics A

IS - 1-4

ER -

Low-lying dipole response in the relativistic quasiparticle time blocking approximation and its influence on neutron capture cross sections

Abstract

Keywords

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