Beta-decay rates of highly ionized heavy atoms in stellar interiors

Takahashi, Kohji; Yokoi, K.

doi:10.1016/0092-640x(87)90010-6

Cited by 292 publications

(221 citation statements)

References 21 publications

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“…However, only small modifications of up to a few percent have been observed in atoms by changing the environmental parameters such as pressure, temperature, or electromagnetic fields [100]. It has been predicted [98,99], that the decay properties of highly-ionized nuclides can be altered dramatically: Decay modes known in neutral atoms can become forbidden or the new ones can be opened up. It is obvious, that the electron capture and electron conversion decays are disabled in the absence of orbital electrons in fullyionized atoms.…”

Section: Atomic Effects On Nuclear Half-livesmentioning

confidence: 99%

“…One of the clear motivations for such experiments is stellar nucleosynthesis in stars, where, due to the high temperatures and densities, the nuclides involved in the s-, r-, rp-, etc processes are, as a rule, not in a neutral atomic charge state but highly ionized [98,99]. One example is the EC-decay of 7 Be, which is discussed in detail in section 2.2 [23].…”

Section: Atomic Effects On Nuclear Half-livesmentioning

confidence: 99%

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Storage ring at HIE-ISOLDE

Grieser

Litvinov

Raabe

et al. 2012

Eur. Phys. J. Spec. Top.

112

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We propose to install a storage ring at an ISOL-type radioactive beam facility for the first time. Specifically, we intend to install the heavy-ion, low-energy ring TSR at the HIE-ISOLDE facility in CERN, Geneva. Such a facility will provide a capability for experiments with stored secondary beams that is unique in the world. The envisaged physics programme is rich and varied, spanning from investigations of nuclear groundstate properties and reaction studies of astrophysical relevance, to investigations with highly-charged ions and pure isomeric beams. The TSR can also be used to remove isobaric contaminants from stored ion beams and for systematic studies within the neutrino beam programme. In addition to experiments performed using beams recirculating within the ring, cooled beams can also be extracted and exploited by external spectrometers for high-precision measurements. The existing TSR, which is presently in operation at the Max-Planck Institute for Nuclear Physics in Heidelberg, is well-suited and can be employed for this purpose. The physics cases, technical details of the existing ring facility and of the beam requirements at HIE-ISOLDE, together with the cost, time and manpower estimates for the transfer, installation and commissioning of the TSR at ISOLDE are discussed in the present technical design report.

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Section: Atomic Effects On Nuclear Half-livesmentioning

confidence: 99%

Section: Atomic Effects On Nuclear Half-livesmentioning

confidence: 99%

Storage ring at HIE-ISOLDE

Grieser

Litvinov

Raabe

et al. 2012

Eur. Phys. J. Spec. Top.

112

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“…The 6 cm thick 6 LiH sphere attenuates scattered neutrons flux by a factor of about 100 for the highest neutron energies [22]. The target is assembled in a DANCE holder consisting of an aluminum cylinder container, a single ring where the sample foil is glued and a system to lock the sample target at the middle of the cylinder.…”

Section: B the Dance Arraymentioning

confidence: 99%

“…This is why many investigations were performed on Lutetium isotopes [2][3][4][5]. 175 Lu is an important socalled waiting point nuclei, having a comparatively long half-life with respect to β-decay time, while the s-only 176 Lu exhibits a thermally enhanced beta decay rate [6], making it a sensitive branch point for estimating neutron density and temperature at the nucleosynthesis site [7]. Macklin [8,9], Beer [10,11], Bokhovko [12] and Wisshak [5] performed various measurements on Lutetium isotopes in the neutron energy region of astrophysical interest between 3 keV and 200 keV.…”

Section: Introductionmentioning

confidence: 99%

Radiative neutron capture cross sections onLu176at DANCE

et al. 2016

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The cross section of the neutron capture reaction 176 Lu(n,γ) has been measured for a wide incident neutron energy range with the Detector for Advanced Neutron Capture Experiments at the Los Alamos Neutron Science Center. The thermal neutron capture cross section was determined to be (1967±137) b for one of the Lu natural isotopes, 176 Lu. The resonance part was measured and compared to the Mughabghab's atlas using the R-matrix code, SAMMY. At higher neutron energies the measured cross sections are compared to ENDF/B-VII.1, JEFF-3.2 and BRC evaluated nuclear data. The Maxwellian averaged cross sections in a stellar plasma for thermal energies between 5 keV and 100 keV were extracted using these data.

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“…The presence of nuclear excited states introduces dependence on T for both neutron-capture (e.g., [3]) and β-decay rates (e.g., [4]). In some environments, β-decay rates are affected by the ionization states of host atoms (e.g., [5]) or by Pauli blocking of the emitted electrons (e.g., [4]). Most important, how neutrons and the seed nuclei capturing them are provided for a neutron-capture process and more generally, how the overall nucleosynthesis proceeds as a function of time are determined by the detailed, often dynamic conditions in the relevant environments.…”

Section: Introductionmentioning

confidence: 99%