Facets of (d,2He) charge-exchange reactions at intermediate energies

Frekers, D.

doi:10.1016/j.nuclphysa.2003.11.020

Cited by 45 publications

(32 citation statements)

References 57 publications

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“…Charge-exchange reactions, however, can map the GT strength distributions over a wider range of excitation energies. A variety of charge-changing reactions can be employed, for example, A Z(p, n) A (Z+1) [423,171], A Z(n, p) A (Z − 1) [424], A Z(d, 2 He) A (Z − 1) [425], A Z( 3 He, t) A (Z + 1) [426][427][428][429], and A Z(t, 3 He) A (Z − 1) [430][431][432][433]. In chargeexchange reactions at beam energies exceeding 100 MeV/nucleon, the cross-section at low momentum transfer (small angles) is proportional to the B(GT ) transition strength [434][435][436]171,173].…”

Section: Weak-interaction Strengthmentioning

confidence: 99%

Nuclear astrophysics with radioactive beams

2010

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a b s t r a c tThe quest to comprehend how nuclear processes influence astrophysical phenomena is driving experimental and theoretical research programs worldwide. One of the main goals in nuclear astrophysics is to understand how energy is generated in stars, how elements are synthesized in stellar events and what the nature of neutron stars is. New experimental capabilities, the availability of radioactive beams and increased computational power paired with new astronomical observations have advanced the present knowledge. This review summarizes the progress in the field of nuclear astrophysics with a focus on the role of indirect methods and reactions involving beams of rare isotopes.

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Section: Weak-interaction Strengthmentioning

confidence: 99%

Nuclear astrophysics with radioactive beams

2010

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“…The present Letter provides an alternative access to this important question by utilizing the 7 Li(d, 2 He) 7 He chargeexchange reaction at zero degrees, where Gamow-Teller (GT) transitions are selectively excited. This reaction at intermediate energies has been developed recently as a high-resolution spectroscopic tool for the study of GT strength distributions [9]. Like the 7 He ground state (g.s.…”

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confidence: 99%

Search for a low-energy resonance in 7He with the 7Li(d, 2He) reaction

et al. 2006

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A search for the J π = 1/2 − spin-orbit partner of the J π = 3/2 − ground state in 7 He has been performed with the 7 Li(d, 2 He) chargeexchange reaction. The experimental results are incompatible with recent claims of such a state at very low excitation energy [M. Meister, et al., Phys. Rev. Lett. 88 (2002) 102501]. A decomposition of the spectrum is performed taking into account known resonances and quasifree charge-exchange reactions on 7 Li as well as on triton and 4 He clusters in the 7 Li ground state. A possible resonance at an excitation energy E x ≈ 1.45 MeV with a width Γ ≈ 2.0 MeV is suggested when the quasifree charge-exchange process on 7 Li is constrained by a measurement of the 6 Li(d, 2 He) reaction. Gamow-Teller strengths for transitions to the lowest states in 7 He deduced from the differential cross sections are in remarkable agreement with results from ab initio quantum Monte Carlo calculations.

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“…Both reactions have been developed in recent years as high-resolution spectroscopic tools for the determination of BGT and BGT ÿ strengths, respectively [15,16]. The good energy resolution in both reactions allows one to resolve the GT strength distribution to individual excited states in the final nuclei.…”

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confidence: 99%

Gamow-Teller Strengths in theA=14Multiplet: A Challenge to the Shell Model

Negreţ¹,

Adachi²,

Barrett³

et al. 2006

Phys. Rev. Lett.

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A new experimental approach to the famous problem of the anomalously slow Gamow-Teller (GT) transitions in the beta decay of the A=14 multiplet is presented. The GT strength distributions to excited states in 14C and 14O were studied in high-resolution (d,2He) and (3He,t) charge-exchange reactions on 14N. No-core shell-model calculations capable of reproducing the suppression of the beta decays predict a selective excitation of Jpi=2+ states. The experimental confirmation represents a validation of the assumptions about the underlying structure of the 14N ground state wave function. However, the fragmentation of the GT strength over three 2+ final states remains a fundamental issue not explained by the present no-core shell model using a 6homega model space, suggesting possibly the need to include cluster structure in these light nuclei in a consistent way.

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Facets of (d,2He) charge-exchange reactions at intermediate energies

Cited by 45 publications

References 57 publications

Nuclear astrophysics with radioactive beams

Nuclear astrophysics with radioactive beams

Search for a low-energy resonance in 7He with the 7Li(d, 2He) reaction

Gamow-Teller Strengths in theA=14Multiplet: A Challenge to the Shell Model

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