<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>β</mml:mi></mml:math>
 decay of deformed 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>r</mml:mi></mml:math>
-process nuclei near 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>A</mml:mi><mml:mo>=</mml:mo><mml:mn>80</mml:mn></mml:mrow></mml:math>
 and 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>A</mml:mi><mml:mo>=</mml:mo><mml:mn>160</mml:mn></mml:mrow></mml:math

Shafer, Thomas R.; Engel, J.; Fröhlich, C.; McLaughlin, G. C.; Mumpower, Matthew; Surman, Rebecca

doi:10.1103/physrevc.94.055802

Cited by 46 publications

(48 citation statements)

References 87 publications

(251 reference statements)

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“…In this spirit, we can use the GT transition strengths measured in ( 3 He, t) charge-exchange reactions to fit the LECs of the effective GT operator in Eq. (18). In this way, we can predict the GT matrix elements for the transition to the 0 + gs ground states of spherical even-even nuclei.…”

Section: B Gt Decays To Ground States Using Gt Transition Strengthsmentioning

confidence: 98%

“…The matrix elements of single-β decays to the ground state are set by the values of the LEC C β , see Eq. (18), which are to be fitted to experimental data. Within the ET the uncertainty of these matrix elements comes from two sources: i) Omitted terms in the effective GT operator that involve two d operators and couple states of oddodd and even-even nuclei with the same number of phonons.…”

Section: Et Gt Decay To Ground States and Theoretical Uncertaintiesmentioning

confidence: 99%

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Gamow-Teller and double- β decays of heavy nuclei within an effective theory

2018

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We study β decays within an effective theory that treats nuclei as a spherical collective core with an even number of neutrons and protons that can couple to an additional neutron and/or proton. First we explore Gamow-Teller β decays of parent odd-odd nuclei into low-lying ground, one-phonon, and two-phonon states of the daughter even-even system. The low-energy constants of the effective theory are adjusted to data on β decays to ground states or Gamow-Teller strengths. The corresponding theoretical uncertainty is estimated based on the power counting of the effective theory. For a variety of medium-mass and heavy isotopes the theoretical matrix elements are in good agreement with experimental results within the theoretical uncertainties. We then study the two-neutrino double-β decay into ground and excited states. The results are remarkably consistent with experiment within theoretical uncertainties, without the necessity to adjust any low-energy constants.arXiv:1708.06140v2 [nucl-th]

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Section: B Gt Decays To Ground States Using Gt Transition Strengthsmentioning

confidence: 98%

Section: Et Gt Decay To Ground States and Theoretical Uncertaintiesmentioning

confidence: 99%

Gamow-Teller and double- β decays of heavy nuclei within an effective theory

2018

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“…Modern predictions of rare earth β-decay rates are in fairly good agreement, showing roughly a factor of 2 deviation between model calculations at high Q β [42,57,55]. We explored the impact of this factor of two rate deviation on our reverse-engineering studies in Ref.…”

Section: Systematic Uncertaintiesmentioning

confidence: 99%

“…The β-decay properties of interest for r-process nucleosynthesis and rare earth peak formation are half-lives and delayed neutron emission probabilities [30,35,54,55,56,19]. Both quantities depend on a theoretical description of the β-strength function, S β , as well as the assumed mass surface of neutron-rich nuclei [42].…”

Section: β-Decaymentioning

confidence: 99%

Reverse engineering nuclear properties from rare earth abundances in therprocess

Mumpower

McLaughlin

Surman

et al. 2017

J. Phys. G: Nucl. Part. Phys.

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Abstract. The bulk of the rare earth elements are believed to be synthesized in the rapid neutron capture process or r process of nucleosynthesis. The solar r-process residuals show a small peak in the rare earths around A ∼ 160, which is proposed to be formed dynamically during the end phase of the r process by a pileup of material. This abundance feature is of particular importance as it is sensitive to both the nuclear physics inputs and the astrophysical conditions of the main r process. We explore the formation of the rare earth peak from the perspective of an inverse problem, using Monte Carlo studies of nuclear masses to investigate the unknown nuclear properties required to best match rare earth abundance sector of the solar isotopic residuals. When nuclear masses are changed, we recalculate the relevant β-decay properties and neutron capture rates in the rare earth region. The feedback provided by this observational constraint allows for the reverse engineering of nuclear properties far from stability where no experimental information exists. We investigate a range of astrophysical conditions with this method and show how these lead to different predictions in the nuclear properties influential to the formation of the rare earth peak. We conclude that targeted experimental campaigns in this region will help to resolve the type of conditions responsible for the production of the rare earth nuclei, and will provide new insights into the longstanding problem of the astrophysical site(s) of the r process. arXiv:1609.09858v1 [nucl-th] 30 Sep 2016Reverse engineering nuclear properties from rare earth abundances in the r process 2

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“…The nuclear network calculations used to estimate the nuclei produced in a merger and their associated radioactive heating rely on nuclear physics information-masses, reaction rates, β-decay and fission properties-for thousands of nuclei from the valley of stability to the neutron drip line [5,6]. Only a fraction of the needed data has be measured experimentally, leading to large uncertainties in predicted abundance patterns [4,[6][7][8][9] and radioactive heating estimates [10].…”

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confidence: 99%

Masses and lifetimes for r-process nucleosynthesis: FRIB outlook

Surman

Mumpower

2018

EPJ Web Conf.

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Nuclear masses and lifetimes are key inputs for calculations of rapid neutron capture (r-process) nucleosynthesis. Masses and half-lives for thousands of nuclei from the valley of stability to the neutron drip line are required and only a fraction have been experimentally measured. Here we examine the promise of the Facility for Rare Isotope Beams, now under construction at Michigan State University, to dramatically reduce uncertainties in r-process abundance patterns due to uncertain masses and half-lives.

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β decay of deformed r -process nuclei near A=80 and A=160

Cited by 46 publications

References 87 publications

Gamow-Teller and double- β decays of heavy nuclei within an effective theory

Gamow-Teller and double- β decays of heavy nuclei within an effective theory

Reverse engineering nuclear properties from rare earth abundances in therprocess

Masses and lifetimes for r-process nucleosynthesis: FRIB outlook

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