Extraction of Gamow-Teller strength distributions from<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow/><mml:mn>56</mml:mn></mml:msup></mml:math>Ni and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow/><mml:mn>55</mml:mn></mml:msup></mml:math>Co via the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mo>(</mml:mo><mml:mi>p</mml:mi><mml:mo>,</mml:mo><mml:mi>n</mml:mi><mml:mo>)</mm

Sasano, M.; Perdikakis, G.; Zegers, R. G. T.; Austin, Sam M.; Bazin, D.; Brown, B. A.; Caesar, C.; Cole, A. L.; Deaven, J. M.; Ferrante, N.; Guess, C. J.; Hitt, G. W.; Honma, Mareki; Meharchand, R.; Montes, F.; Palardy, J.; Prinke, A.; Riley, L. A.; Sakai, H.; Scott, M.; Stolz, A.; Suzuki, Toshio; Valdez, L.; Yako, K.

doi:10.1103/physrevc.86.034324

Cited by 42 publications

(24 citation statements)

References 41 publications

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“…In comparison to the 56 Fe(n,p) data, the summed theoretical strengths from the shell models match quite well. We note that the somewhat better performance of the GXPF1a interaction compared to the KB3G interaction confirms the findings for neighboring nuclei 56 Ni and 55 Co [24,25].…”

Section: B Extraction Of Strengthsupporting

confidence: 86%

“…That summary showed that both sets of shell-model calculations do rather well in reproducing experimentally extracted GT strength distributions, and derived electron-capture rates had averaged absolute deviations of less than 40% over wide temperature and density ranges of relevance for astrophysical simulations. A recent experiment focused on extracting the GT transition strength from 56 Ni [24,25] laid bare some of the key differences between the two above-mentioned shell-model calculations and indicated that the GXPF1a interaction performs slightly better. The QRPA calculations did not reproduce the experimental GT strength distributions as well and the derived electron-capture rates had much larger errors.…”

Section: Introductionmentioning

confidence: 99%

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Gamow-Teller transition strengths fromFe56extracted from theFe56(t,
Scott
¹
,
Shimbara
²
,
Austin
³

et al. 2014
Phys. Rev. C
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0
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Background: Gamow-Teller (GT) transition strengths are key inputs for estimating weak reaction rates of importance for a wide variety of astrophysical applications. (n,p)-type charge-exchange reactions, such as the (t, 3 He) reaction used in this work, are commonly used for extracting the GT strength distribution in the β + (electron-capture) direction. Such studies are important for testing theoretical models used to estimate weak rates for a large number of nuclei for simulations of astrophysical phenomena. Purpose: The 56 Fe(t, 3 He) reaction at 115 A MeV was measured in order to extract GT strengths for transitions to 56 Mn. The extracted strength distributions were compared with shell-model calculations in the pf -shell model space using the KB3G and GXPF1a interactions, and with calculations in the quasi-particle random-phase approximation (QRPA). Method: Differential cross sections and excitation-energy spectra for the 56 Fe(t, 3 He) reaction were determined by measuring the trajectories of 3 He ejectiles through the S800 magnetic spectrograph and deducing their momenta. Contributions corresponding to GT transitions were isolated by using a multipole decomposition analysis. A well-established proportionality between GT strength and differential cross section at zero-linear-momentum transfer was utilized to convert extracted cross sections to GT strengths. Results and Conclusions: GT transition strengths from 56 Fe to 56 Mn were extracted up to an excitation energy of 10 MeV. Shell-model calculations with the GXPF1a interaction reproduced the observed GT strength distribution slightly better than calculations with the KB3G interaction. The calculated strength distribution in the QRPA did not reproduce the observed strength distribution. The new experimental data have an improved precision at low excitation energies compared to previous results obtained from an 56 Fe(n,p) experiment. Electron-capture rates based on the experimental and theoretical Gamow-Teller strengths were compared and deviations were included in an assessment of the validity of electron-capture rates based on theoretical models for nuclei in the pf shell.

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Section: B Extraction Of Strengthsupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Gamow-Teller transition strengths fromFe56extracted from theFe56(t,
Scott
¹
,
Shimbara
²
,
Austin
³

et al. 2014
Phys. Rev. C
Self Cite
11
0
11
0
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“…The use of the (p, n) reaction to study the AGDR can be extended to unstable nuclei due to the progress made in the development of new experimental techniques involving radioactive beams in inverse kinematics [72,73]. Further experimental efforts on the AGDR in other mass regions and/or in long isotopic chains are desirable to increase the predictive power of current energy density functionals and to reduce the model dependence that one deals with when extracting nuclear matter properties.…”

Section: Summary and Perspectivementioning

confidence: 99%

Constraints on the neutron skin and symmetry energy from the anti-analog giant dipole resonance inPb208

2015

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We investigate the impact of the neutron-skin thickness, ∆Rnp, on the energy difference between the anti-analog giant dipole resonance (AGDR), EAGDR, and the isobaric analog state (IAS), EIAS, in a heavy nucleus such as 208 Pb. For guidance, we first develop a simple and analytic, yet physical, approach based on the Droplet Model that linearly connects the energy difference EAGDR−EIAS with ∆Rnp. To test this correlation on more fundamental grounds, we employ a family of systematically varied Skyrme energy density functionals where variations on the value of the symmetry energy at saturation density J are explored. The calculations have been performed within the fully selfconsistent Hartree-Fock (HF) plus charge-exchange random phase approximation (RPA) framework. We confirm the linear correlation within our microscopic apporach and, by comparing our results with available experimental data in 208 Pb, we find that our analysis is consistent with ∆Rpn = 0.204 ± 0.009 fm, J = 31.4 ± 0.5 MeV and a slope parameter of the symmetry energy at saturation of L = 76.4 ± 5.4 MeV -the attached errors correspond to a lower-limit estimate of the systematic plus experimental uncertainties. These results are in agreement with those extracted from different experimental data albeit, L and ∆Rpn, are somewhat large when compared to previous estimations based on giant resonance studies.

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“…One of the reasons of the different structure of the GT strength can be attributed to a wider single-particle shell gap between 0f 7/2 and 0f 5/2 orbits for GXPF1J. The GT strength in 55 Co recently measured by (p, n) reaction is also found to be reproduced well by GXPF1J [4], which is more fragmented compared to the case of KB3G as shown in Fig. 2(a).…”

Section: Gamow-teller Strengths In Ni and Co Isotopes And Electron Camentioning

confidence: 73%

Electron Capture Reactions and β-decays in Astrophysical Processes

Suzuki¹

2013

Proceedings of XII International Symposium on Nuclei in the Cosmos — PoS(NIC XII)

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Gamow-Teller (GT) strengths in Ni and Co isotopes are studied by shell model calculations with the use of a new Hamiltonian in f p-shell, GXPF1J. The GT strengths obtained are used to evaluate electron capture reaction rates at stellar environments. The calculated capture rates in 56 Ni, 58 Ni and 60 Ni as well as 55 Ni are found to reproduce well the rates obtained by using the experimental GT strengths. The evaluation of the capture rates has been considerably improved compared with previous calculations.β -decay half-lives for waiting-point nuclei at N=126 are studied by shell-model calculations including both the GT and first-forbidden (FF) transitions. The FF transitions reduce the halflives obtained with the GT contributions by nearly twice to several times. The half-lives obtained here are short compared to standard values of FRDM. Possible implications of the short half-lives on the r-process nucleosynthesis are investigated. Quenching of axial-vector (g A ) and vector (g V )

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Extraction of Gamow-Teller strength distributions from56Ni and55Co via the(p,n)

Cited by 42 publications

References 41 publications

Gamow-Teller transition strengths fromFe56extracted from theFe56(t,
Scott
¹
,
Shimbara
²
,
Austin
³

et al. 2014
Phys. Rev. C
Self Cite
11
0
11
0
View full text Add to dashboard Cite

Gamow-Teller transition strengths fromFe56extracted from theFe56(t,
Scott
¹
,
Shimbara
²
,
Austin
³

et al. 2014
Phys. Rev. C
Self Cite
11
0
11
0
View full text Add to dashboard Cite

Constraints on the neutron skin and symmetry energy from the anti-analog giant dipole resonance inPb208

Electron Capture Reactions and β-decays in Astrophysical Processes

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Extraction of Gamow-Teller strength distributions from56Ni and55Co via the(p,n)

Cited by 42 publications

References 41 publications

Gamow-Teller transition strengths fromFe56extracted from theFe56(t,Scott1, Shimbara2, Austin3 et al. 2014Phys. Rev. CSelf Cite110110View full textAdd to dashboardCite

Gamow-Teller transition strengths fromFe56extracted from theFe56(t,Scott1, Shimbara2, Austin3 et al. 2014Phys. Rev. CSelf Cite110110View full textAdd to dashboardCite

Constraints on the neutron skin and symmetry energy from the anti-analog giant dipole resonance inPb208

Electron Capture Reactions and β-decays in Astrophysical Processes

Contact Info

Product

Resources

About

Gamow-Teller transition strengths fromFe56extracted from theFe56(t,
Scott
¹
,
Shimbara
²
,
Austin
³

et al. 2014
Phys. Rev. C
Self Cite
11
0
11
0
View full text Add to dashboard Cite

Gamow-Teller transition strengths fromFe56extracted from theFe56(t,
Scott
¹
,
Shimbara
²
,
Austin
³

et al. 2014
Phys. Rev. C
Self Cite
11
0
11
0
View full text Add to dashboard Cite