Gamow-Teller Transition Strengths from<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi>Ni</mml:mi><mml:mprescripts /><mml:none /><mml:mn>56</mml:mn></mml:mmultiscripts></mml:math>

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.; Meharchand, R.; Montes, F.; Palardy, J.; Prinke, A.; Riley, L. A.; Sakai, H.; Scott, M.; Stolz, A.; Valdez, L.; Yako, K.

doi:10.1103/physrevlett.107.202501

Cited by 89 publications

(82 citation statements)

References 31 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 calculations demonstrate the shift of GT strength toward low energy with increasing strength of the T = 0 force, which is determined by the factor f . However, in looking at the results for 56 Ni, which are compared to data obtained at RIKEN [175], we believe that the discrepancy between theory and experiment is still too substantial that one can quantify the low-energy enhancement caused by T = 0 pair correlations.…”

Section: Gamow-teller β-Decaymentioning

confidence: 99%

“…For example, Bai et al [172] have recently studied GT states in N = Z nuclei with the mass number A from 48 to 64 by means of QRPA based on a Skyrme Figure 51: GT strength in 48 Cr, 56 Ni and 64 Ge by HFB+QRPA with the Skyrme interaction from Ref. [175].…”

Section: Gamow-teller β-Decaymentioning

confidence: 99%

Overview of neutron–proton pairing

Frauendorf

Macchiavelli

2014

Progress in Particle and Nuclear Physics

188

179

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The role of neutron-proton pairing correlations on the structure of nuclei along the N = Z line is reviewed. Particular emphasis is placed on the competition between isovector (T = 1) and isoscalar (T = 0) pair fields. The expected properties of these systems, in terms of pairing collective motion, are assessed by different theoretical frameworks including schematic models, realistic Shell Model and mean field approaches. The results are contrasted with experimental data with the goal of establishing clear signals for the existence of neutron-proton (np) condensates. We will show that there is clear evidence for an isovector np condensate as expected from isospin invariance. However, and contrary to early expectations, a condensate of deuteron-like pairs appears quite elusive and pairing collectivity in the T = 0 channel may only show in the form of a phonon. Arguments are presented for the use of direct reactions, adding or removing an np pair, as the most promising tool to provide a definite answer to this intriguing question.

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“…In particular, resonance structures in GT strengths [GT resonances, (GTR)] were systematically observed at E x ≈ 10 MeV, which can not be observed in β-decay studies. In addition, in a recent pioneering (p, n) reaction using inverse kinematics, GT transitions from the T z = 0 unstable nucleus 56 Ni have been studied [9]. The energy resolutions achieved in the (p, n) reaction studies were around 300 keV or greater.…”

Section: Introductionmentioning

confidence: 99%

High-resolution study of Gamow-Teller transitions in the47Ti(3He,t)
Ganioğlu¹,
Fujita²,
Fujita³
et al. 2013
Phys. Rev. C
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Given the importance of Gamow-Teller (GT) transitions in nuclear structure and astrophysical nuclear processes, we have studied Tz = +3/2 → +1/2, GT transitions starting from the 47 Ti nucleus in the ( 3 He, t) charge-exchange reaction at 0• and at an intermediate incident energy of 140 MeV/nucleon. The experiments were carried out at the Research Center for Nuclear Physics (RCNP), Osaka using the high resolution facility consisting of a high-dispersion beam line and the Grand-Raiden spectrometer. With an energy resolution of 20 keV, individual GT transitions were observed and GT strength was derived for each state populated up to an excitation energy (Ex) of 12.5 MeV. The GT strength was widely distributed from low excitation energy up to 12.5 MeV, where we had to stop the analysis due to the high level density. The distribution of the GT strengths was compared with the results of shell model calculations using the GXPF1 interaction. The calculations could reproduce the experimental GT distributions well. The GT transitions from the ground state of 47 Ti and the M 1 transitions from the isobaric analog state in 47 V to the same low-lying states in 47 V are analogous. It was found that the ratios of GT transition strengths to the ground state, the 0.088 MeV, and the 0.146 MeV states are similar to the ratios of the strengths of the analogous M 1 transitions from the IAS to these states. The measured distribution of the GT strengths was also compared with those starting from the Tz = +3/2 nucleus 41 K to the Tz = +1/2 nucleus 41 Ca.

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Gamow-Teller Transition Strengths fromNi56

Cited by 89 publications

References 31 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

Overview of neutron–proton pairing

High-resolution study of Gamow-Teller transitions in the47Ti(3He,t)
Ganioğlu¹,
Fujita²,
Fujita³
et al. 2013
Phys. Rev. C
Self Cite

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Gamow-Teller Transition Strengths fromNi56

Cited by 89 publications

References 31 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

Overview of neutron–proton pairing

High-resolution study of Gamow-Teller transitions in the47Ti(3He,t)Ganioğlu1, Fujita2, Fujita3 et al. 2013Phys. Rev. CSelf Cite

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

High-resolution study of Gamow-Teller transitions in the47Ti(3He,t)
Ganioğlu¹,
Fujita²,
Fujita³
et al. 2013
Phys. Rev. C
Self Cite