Nuclear Properties for Astrophysical and Radioactive-Ion-Beam Applications

Möller, P.; Nix, J.R.; Kratz, Karl

doi:10.1006/adnd.1997.0746

Cited by 1,175 publications

(1,065 citation statements)

References 55 publications

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“…This makes it difficult to predict nuclear properties such as half-lives and nuclear masses in neutron-rich nuclei around N = 126 using theoretical nuclear models [1][2][3]. For example, estimated half-lives of these nuclei typically differ by an order of magnitude [4][5][6][7][8]. The half-life is an important factor in investigations into astrophysical environments and nuclear structure.…”

Section: Introductionmentioning

confidence: 99%

In-gas-cell laser spectroscopy of the magnetic dipole moment of the N≈126 isotope Pt199

et al. 2017

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The magnetic dipole moment and mean-square charge radius of 199g Pt (I π = 5/2 − , t 1/2 = 30.8 min) ground state and 199m Pt (E ex = 424 keV, I π = (13/2) + , t 1/2 = 13.6 s) isomeric state are evaluated for the first time from investigations of the hyperfine splitting of the λ 1 = 248.792 nm transition by in-gas-cell laser ionization spectroscopy. Ground and isomeric states of neutron-rich 199 Pt nucleus were produced by a multinucleon transfer reaction at the KEK Isotope Separation System (KISS), designed for the study of nuclear spectroscopy in the vicinity of N = 126. The measured magnetic dipole moments +0.75(8)μ N and −0.57(5)μ N are consistent with the systematics of those of nuclei with I π = 5/2 − and I π = 13/2 + , respectively.

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Section: Introductionmentioning

confidence: 99%

In-gas-cell laser spectroscopy of the magnetic dipole moment of the N≈126 isotope Pt199

et al. 2017

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“…1 together with those obtained in Refs. [2,3]. Contributions from FF transitions become more important than those from GT transitions for Z > 72.…”

Section: Half-lives Of Waiting-point Nuclei With N =126mentioning

confidence: 97%

“…The element abundances are obtained up to the third peak as well as beyond the peak region up to thorium and uranium. Thorium and uranium are found to be produced more with the shorter shell-model half-lives and their abundances come closer to the observed values in core-collapse supernova explosions, while in case of binary neutron star mergers they are produced as much as the observed values rather independent of the half-lives.KEYWORDS: beta-decay rate, r-process nucleosynthesis, shell-model, core-collapse supernova explosion, neutron star merger We use the present SM half-lives, which are short compared to the conventional ones of FRDM [3], to study r-process nucleosynthesis in various astrophysical conditions to obtain possible hints for the r-process site which is still under controversy. …”

mentioning

confidence: 99%

“…KEYWORDS: beta-decay rate, r-process nucleosynthesis, shell-model, core-collapse supernova explosion, neutron star merger We use the present SM half-lives, which are short compared to the conventional ones of FRDM [3], to study r-process nucleosynthesis in various astrophysical conditions to obtain possible hints for the r-process site which is still under controversy.…”

mentioning

confidence: 99%

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Beta-Decay Rates for Exotic Nuclei and R-Process Nucleosynthesis up to Th and U

Suzuki¹,

Yoshida²,

Shibagaki³

et al. 2017

Proceedings of the 14th International Symposium on Nuclei in the Cosmos (NIC2016)

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Beta-decay rates for exotic nuclei with N=126 relevant to r-process nucleosynthesis are studied up to Z=78 by shell-model calculations. The half-lives for the waiting-point nuclei obtained, which are short compared to a standard FRDM, are used to study r-process nucleosynthesis in neutrino-driven winds and magneto-hydrodynamic jets of core-collapse supernova explosions as well as in binary neutron star mergers. The element abundances are obtained up to the third peak as well as beyond the peak region up to thorium and uranium. Thorium and uranium are found to be produced more with the shorter shell-model half-lives and their abundances come closer to the observed values in core-collapse supernova explosions, while in case of binary neutron star mergers they are produced as much as the observed values rather independent of the half-lives.KEYWORDS: beta-decay rate, r-process nucleosynthesis, shell-model, core-collapse supernova explosion, neutron star merger We use the present SM half-lives, which are short compared to the conventional ones of FRDM [3], to study r-process nucleosynthesis in various astrophysical conditions to obtain possible hints for the r-process site which is still under controversy.

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“…The influence of the masses on the β-decay lifetimes is largely through the phase space, which goes roughly as Q 5 β . We take the nuclear matrix elements from [8] and recalculate the phase space factors with the appropriate DFT Q β values. The probabilities for β-delayed neutron emission are calculated with CoH as in [9].…”

Section: Dft Massesmentioning

confidence: 99%

Systematic and Statistical Uncertainties in Simulated r-Process Abundances due to Uncertain Nuclear Masses

Surman¹,

Mumpower²,

McLaughlin³

2017

Proceedings of the 14th International Symposium on Nuclei in the Cosmos (NIC2016)

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Unknown nuclear masses are a major source of nuclear physics uncertainty for r-process nucleosynthesis calculations. Here we examine the systematic and statistical uncertainties that arise in r-process abundance predictions due to uncertainties in the masses of nuclear species on the neutron-rich side of stability. There is a long history of examining systematic uncertainties by the application of a variety of different mass models to r-process calculations. Here we expand upon such efforts by examining six DFT mass models, where we capture the full impact of each mass model by updating the other nuclear properties-including neutron capture rates, β-decay lifetimes, and β-delayed neutron emission probabilities-that depend on the masses. Unlike systematic effects, statistical uncertainties in the r-process pattern have just begun to be explored. Here we apply a global Monte Carlo approach, starting from the latest FRDM masses and considering random mass variations within the FRDM rms error. We find in each approach that uncertain nuclear masses produce dramatic uncertainties in calculated r-process yields, which can be reduced in upcoming experimental campaigns.

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Nuclear Properties for Astrophysical and Radioactive-Ion-Beam Applications

Cited by 1,175 publications

References 55 publications

In-gas-cell laser spectroscopy of the magnetic dipole moment of the N≈126 isotope Pt199

In-gas-cell laser spectroscopy of the magnetic dipole moment of the N≈126 isotope Pt199

Beta-Decay Rates for Exotic Nuclei and R-Process Nucleosynthesis up to Th and U

Systematic and Statistical Uncertainties in Simulated r-Process Abundances due to Uncertain Nuclear Masses

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