Isovector Excitations in Nuclei

Rapaport, J.; Sugarbaker, E.

doi:10.1146/annurev.ns.44.120194.000545

Cited by 92 publications

(82 citation statements)

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“…For the sd-shell nuclei this difference amounted to about 30% with respect to that measured in free neutron decay [5,6]. In addition, when chargeexchange reactions were used to explore a large fraction of the Gamow-Teller strength sum rule, evidence also pointed to "quenching of the Gamow-Teller strength" [7,8]. However, the origin of the quenching is not completely clear.…”

Section: Introductionmentioning

confidence: 95%

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Precision measurement of the6He half-life and the weak axial current in nuclei

et al. 2012

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Background: The beta decays of 3 H and 6 He can play an important role in testing nuclear wave-function calculations and fixing low-energy constants in effective-field theory approaches. However, there exists a large discrepancy between previous measurements of the 6 He half-life.Purpose: Our measurement aims at resolving this long-standing discrepancy in the 6 He half-life and providing a reliable f t-value and Gamow-Teller matrix element for comparison with theoretical ab-initio calculations.Method: We measured the 6 He half-life by counting the beta-decay electrons with two scintillator detectors operating in coincidence.Results: The measured 6 He half-life is 806.89 ± 0.11stat +0.23 −0.19 syst ms corresponding to a relative precision of 3 × 10 −4 . Calculating the statistical rate function we determined the f t-value to be 803.04 +0.26 −0.23 s. Conclusions: Our result resolves the previous discrepancy by providing a higher-precision result with careful analysis of potential systematic uncertainties. The result provides a reliable basis for future precision comparisons with ab-inito calculations.

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Section: Introductionmentioning

confidence: 95%

“…Integrating the background-subtracted beta energy spectrum above the 6 He endpoint and operating at our nominal deuteron beam energy we set an upper limit of 2 × 10 −4 at 68% C.L. on the fraction of possible 8 Li contamination translating in a systematic uncertainty of 0.007 ms.…”

Section: Systematic Uncertaintiesmentioning

confidence: 99%

Precision measurement of the6He half-life and the weak axial current in nuclei

et al. 2012

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“…In particular, GT excitations become prominent at intermediate incident energies (above 100 MeV/nucleon) and forward angles around 0 • [4,10]. Since the 1980s, (p, n) reactions performed at incoming proton energies of E p = 120 − 200 MeV have been used for the study of GT transitions in the β − direction [10]. One of the most important findings was the structure named the GamowTeller resonance (GTR) situated at the high excitation energies of E x = 9 − 16 MeV.…”

Section: Introductionmentioning

confidence: 99%

“…In CE reactions, on the other hand, GT excitations can be studied up to high excitation energies. In particular, GT excitations become prominent at intermediate incident energies (above 100 MeV/nucleon) and forward angles around 0 • [4,10]. Since the 1980s, (p, n) reactions performed at incoming proton energies of E p = 120 − 200 MeV have been used for the study of GT transitions in the β − direction [10].…”

Section: Introductionmentioning

confidence: 99%

“…One of the most important findings was the structure named the GamowTeller resonance (GTR) situated at the high excitation energies of E x = 9 − 16 MeV. The GTRs, with bump-like structures having a width of a few MeV and carrying the main part of the observed GT transition strength, have been systematically studied in nuclei with mass number A larger than ≈ 50 [5,10,11].…”

Section: Introductionmentioning

confidence: 99%

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