Reaction<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Kr</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>86</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow><mml:mo>(</mml:mo><mml:mi>d</mml:mi><mml:mo>,</mml:mo><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">He</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>3</mml:mn></mml:mrow

May, Edwin C.; Lewis, Simon A.

doi:10.1103/physrevc.5.117

Cited by 12 publications

(5 citation statements)

References 3 publications

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“…[64] does not report any ∆L = 4 strength in the 86 Kr to 85 Br reaction, while Ref. [65] reports tentative ∆L = 4 strength in a state at E x = 2.31 MeV with a deduced occupation of 1.12. We note that proton 9/2 occupation numbers for 90 Zr and 88 Sr of 1.0 and 0.7 were reported, respectively [64], suggesting the calculated value of 0.40 in the shell model for 86 Kr is not unreasonable.…”

Section: Comparison To Theorymentioning

confidence: 95%

Constraints for stellar electron-capture rates on $^{86}$Kr via the $^{86}$Kr($t$,$^{3}$He$+γ$)$^{86}$Br reaction and the implications for core-collapse supernovae

Titus,

Ney,

Zegers

et al. 2019

Preprint

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In the late stages of stellar core-collapse, prior to core bounce, electron captures on medium-heavy nuclei drive deleptonization and simulations require the use of accurate reaction rates. Nuclei with neutron number near N = 50, just above atomic number Z = 28, play an important role, but rates used in astrophysical simulations rely primarily on a relatively simple single-state approximation. In order to improve the accuracy of astrophysical simulations, experimental data are needed to test the electron-capture rates and to guide the development of better theoretical models. This work presents the results of the 86 Kr(t, 3 He+γ) experiment at the NSCL, from which an upper limit for the Gamow-Teller strength up to an excitation energy in 86 Br of 5 MeV is extracted. The derived upper limit for the electron-capture rate on 86 Kr indicates that the rate estimated through the single-state approximation is too high and that rates based on Gamow-Teller strengths estimated in shell-model and QRPA calculations are more accurate. The QRPA calculations tested in this manner were used for estimating the electron capture rates for 78 isotopes near N = 50 and above Z = 28. The impact of using these new electron-capture rates in simulations of supernovae instead of the rates based on the single-state approximation is investigated, indicating a significant reduction in the deleptonization that affects multi-messenger signals, such as the emission of neutrinos and gravitational waves.

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Section: Comparison To Theorymentioning

confidence: 95%

Constraints for stellar electron-capture rates on $^{86}$Kr via the $^{86}$Kr($t$,$^{3}$He$+γ$)$^{86}$Br reaction and the implications for core-collapse supernovae

Titus,

Ney,

Zegers

et al. 2019

Preprint

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show abstract

“…The occupation probabilities of the two proton sub-shells can be assessed from the results obtained in 85 Br using the (d, 3 He) pick-up reaction [23]. The measured spectroscopic factors imply that the πf 5/2 sub-shell is not completely filled (C 2 S = 4.46) and the πp 3/2 sub-shell contains more than one proton (C 2 S = 1.7).…”

Section: Eπν (Kev)mentioning

confidence: 99%

High-spin excitations of 84 35Br49 and 85 35Br50: Mapping the proton sub-shells towards 78Ni

et al. 2006

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HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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“…Within the context of the simple shell model, the 1g 9/2 proton orbital is empty in the 86 Kr ground state and, consequently, no = 4 proton pickup strength should be observed. Contrary to this expectation, = 4 strength was observed by May and Lewis [55] for an excited state of 85 Br at E x = 2.310(31) MeV with a spectroscopic strength of C 2 S = 1.12, corresponding to a proton 1g 9/2 occupation probability of V j 2 = 0.11 in the ground state of 86 Kr. However, a subsequent measurement by Pfeiffer et al [56], which used a beam of vector-polarised deuterons, assigned a J π of 3/2 − to a state at 2.3 MeV.…”

Section: Levels and Transitions In 87 Rbmentioning

confidence: 66%

“…84 Se is not a stable nucleus and the 84 Se( 3 He, d) 85 Br proton stripping reaction has not been reported in the literature to date. However, the 86 Kr(d, 3 He) 85 Br proton pickup reaction has been studied by May and Lewis [55] and by Pfeiffer et al [56]. Within the context of the simple shell model, the 1g 9/2 proton orbital is empty in the 86 Kr ground state and, consequently, no = 4 proton pickup strength should be observed.…”

Section: Levels and Transitions In 87 Rbmentioning

confidence: 99%

Study of medium-spin states of neutron-rich 87, 89, 91Rb isotopes

et al. 2019

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Excited states of the rubidium isotopes 87,89,91 37 Rb have been studied at the INFN Legnaro National Laboratory. Measurements of the γ-ray decay of fragments produced in binary grazing reactions resulting from the interaction of a beam of 530 MeV 96 Zr ions with a 124 Sn target have been complemented by studies of the γ-ray decay of fission fragments produced in the interaction of a beam of 230 MeV 36 S ions with a thick 176 Yb target. The structure of the yrast states of 87,89,91 37 Rb has been discussed within the context of spherical shell-model and cranked Nilsson-Strutinsky calculations.

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ReactionKr86(d,He3

Cited by 12 publications

References 3 publications

Constraints for stellar electron-capture rates on $^{86}$Kr via the $^{86}$Kr($t$,$^{3}$He$+γ$)$^{86}$Br reaction and the implications for core-collapse supernovae

Constraints for stellar electron-capture rates on $^{86}$Kr via the $^{86}$Kr($t$,$^{3}$He$+γ$)$^{86}$Br reaction and the implications for core-collapse supernovae

High-spin excitations of 84 35Br49 and 85 35Br50: Mapping the proton sub-shells towards 78Ni

Study of medium-spin states of neutron-rich 87, 89, 91Rb isotopes

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