Measurement of keV-Neutron Capture Cross Section of<sup>96</sup>Zr

Katabuchi, Tatsuya; Igashira, M.; Kiyanagi, Yoshiaki

doi:10.1080/18811248.2011.9711757

“…[76][77][78] and for 96 Zr are from Refs. [78,79]. According to Bao and Käppeler [80], existing experimental neutron capture cross sections for 96 Zr exhibit large discrepancies up to a factor of 2.…”

Section: B Total Capture Cross Sectionsmentioning

confidence: 99%

Neutron capture reactions relevant to thesandpprocesses in the region of theN=50shell closure

Dutta

¹

,

Gangopadhyay

²

,

Bhattacharyya

³

2016

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Radiative thermal neutron capture cross sections for nuclei participating in s-process and pprocess nucleosynthesis in and around N = 50 closed neutron shell have been calculated in statistical semi-microscopic Hauser-Feshbach approach for the energy range of astrophysical interest. A folded optical-model potential is constructed utilizing the standard DDM3Y real nucleon-nucleon interaction. The folding of the interaction with target radial matter densities, obtained from the relativistic-mean-field approach, is done in coordinate space using the spherical approximation. The standard nuclear reaction code TALYS1.8 is used for cross-section calculation. The cross sections are compared with experimental results and reasonable agreements are found for almost all cases. Maxwellian-averaged cross sections (MACS) for the nuclei are presented at a single thermal energy of 30 keV relevant to s-process. We have also presented the MACS values over a range of energy from 5 to 100 keV for neutron magic nuclei with (N = 50).PACS numbers: I. INTRODUCTIONElements heavier than iron are produced via two principle processes, namely, the slow neutron capture process (s-process) and the rapid neutron capture process (r-process), differing in the respective neutron capture timescales with respect to the β-decay half-lives. There is a minor contribution from another process, namely, pprocess, producing a subset of proton-rich isotopes. The detailed study of the heavy element nucleosynthesis was done in the fundamental work of Burbidge et al. [1] and also of Cameron [2]. Recently Käppeler et al. [3] presented a review of progress on the studies of s-process nucleosynthesis with advanced nuclear physics inputs, observational data, and stellar models.While the majority of the theory of the s-process is well-developed, uncertainty still remains in constraining the neutron capture rates of nuclei involved in nucleosynthesis chain. The capture cross sections are highly scattered and uncertain in the energy range appropriate for astrophysical applications. These uncertainties lead to significant errors in determining exact abundances of elements involved in different processes. Many works * Electronic address: saumidutta89@gmail.com † Electronic address: ggphy@caluniv.ac.in ‡ Electronic address: abhattacharyyacu@gmail.com have been devoted to this respect in order to measure the thermal neutron capture cross sections relevant to s-process temperature. However, reactions on some important nuclei are still not available due to their unavailability in the terrestrial laboratory. Käppeler et al. [4] showed the present status of the uncertainty of stellar (n, γ) cross sections and commented that improvements are certainly necessary especially in the mass region below A=120 and above A=180. Some reactions are of significant importance, basically those with closed neutron shells acting as bottlenecks to the s-process reaction flow. They have very low cross-sections and in some scenarios, the s-process reaction flow cannot overcome these bottlen...

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“…[76][77][78] and for 96 Zr are from Refs. [78,79]. According to Bao and Käppeler [80], existing experimental neutron capture cross sections for 96 Zr exhibit large discrepancies up to a factor of 2.…”

Section: B Total Capture Cross Sectionsmentioning

confidence: 99%

Neutron capture reactions relevant to s-process and p-process in the domain of the $N=50$ shell closure

Dutta,

Gangopadhyay,

Bhattacharyya

2016

Preprint

0

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Radiative thermal neutron capture cross sections for nuclei participating in s-process and pprocess nucleosynthesis in and around N = 50 closed neutron shell have been calculated in statistical semi-microscopic Hauser-Feshbach approach for the energy range of astrophysical interest. A folded optical-model potential is constructed utilizing the standard DDM3Y real nucleon-nucleon interaction. The folding of the interaction with target radial matter densities, obtained from the relativistic-mean-field approach, is done in coordinate space using the spherical approximation. The standard nuclear reaction code TALYS1.8 is used for cross-section calculation. The cross sections are compared with experimental results and reasonable agreements are found for almost all cases. Maxwellian-averaged cross sections (MACS) for the nuclei are presented at a single thermal energy of 30 keV relevant to s-process. We have also presented the MACS values over a range of energy from 5 to 100 keV for neutron magic nuclei with (N = 50).

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Pulse-width analysis for neutron capture cross-section measurement using an NaI(Tl) detector

Katabuchi

¹

,

Matsuhashi

²

,

Terada

³

et al. 2014

Nuclear Instruments and Methods in Physics Research Section A:

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Measurement of keV-Neutron Capture Cross Section of⁹⁶Zr

Cited by 8 publications

References 24 publications

Neutron capture reactions relevant to thesandpprocesses in the region of theN=50shell closure

Neutron capture reactions relevant to thesandpprocesses in the region of theN=50shell closure

Neutron capture reactions relevant to s-process and p-process in the domain of the $N=50$ shell closure

Pulse-width analysis for neutron capture cross-section measurement using an NaI(Tl) detector

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Measurement of keV-Neutron Capture Cross Section of96Zr

Cited by 8 publications

References 24 publications

Neutron capture reactions relevant to thesandpprocesses in the region of theN=50shell closure

Neutron capture reactions relevant to thesandpprocesses in the region of theN=50shell closure

Neutron capture reactions relevant to s-process and p-process in the domain of the $N=50$ shell closure

Pulse-width analysis for neutron capture cross-section measurement using an NaI(Tl) detector

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Measurement of keV-Neutron Capture Cross Section of⁹⁶Zr