Investigation of Excited States in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">Be</mml:mi></mml:mrow><mml:mrow><mml:mn>8</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>by Alpha-Particle Scattering from He

Nilson, R.; Jentschke, W.; Briggs, George R.; Kerman, R. O.; Snyder, Julie

doi:10.1103/physrev.109.850

Cited by 107 publications

(54 citation statements)

References 40 publications

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“…Fig. 3 shows the phase shifts for S-wave scattering versus laboratory energy at next-to-leading order (NLO) in chiral effective field theory, next-to-next-to-leading order (NNLO), and the comparison with experimental data [21][22][23][24]. The results at leading order (LO) do not include Coulomb effects and so have significantly different behavior near threshold and are not shown.…”

Section: Lattice Calculations and Resultsmentioning

confidence: 99%

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Ab initio alpha–alpha scattering

Elhatisari

Lee

Rupak

et al. 2015

Nature

173

190

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Processes involving alpha particles and alpha-like nuclei comprise a major part of stellar nucleosynthesis and hypothesized mechanisms for thermonuclear supernovae. In an effort towards understanding alpha processes from first principles, we describe in this letter the first ab initio calculation of alpha-alpha scattering. We use lattice effective field theory to describe the low-energy interactions of nucleons and apply a technique called the adiabatic projection method to reduce the eight-body system to an effective two-cluster system. We find good agreement between lattice results and experimental phase shifts for S-wave and D-wave scattering. The computational scaling with particle number suggests that alpha processes involving heavier nuclei are also within reach in the near future.

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Section: Lattice Calculations and Resultsmentioning

confidence: 99%

“…The computational effort needed for the A 1 -body + A 2 -body problem is roughly [21][22][23][24]. In the inset we show next-to-leading-order calculations using halo effective field theory [32].…”

Section: Discussionmentioning

confidence: 99%

Ab initio alpha–alpha scattering

Elhatisari

Lee

Rupak

et al. 2015

Nature

173

190

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“…The experimental values o~xp and errors "2 used for the d-wave a-IX scattering phase shift are those of Heydenberg and Temmer (1956) for channel energies E = 1·0-1·5 MeV (with the errors increased to 1°), Tombrello and Senhouse (1963) for E = 1·92-5·94 MeV, and Nilson et al (1958) for E = 6·15-11·45 MeV. For E = 11· 55-17 .…”

Section: R-matrix Parameters From A-ix Scattering Datamentioning

confidence: 99%

2+ States of 8Be

Barker¹

1969

Aust. J. Phys.

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SummaryAnalysis by many-level R-matrix theory of the d-wave "'-'" scattering phase shift suggests the existence of broad 2+ excited states of 8Be, but their properties depend sensitively on the assumed channel radius a2. A simultaneous fit to the 9Be(p, d)8Be deuteron spectrum near the 2, 9 MeV peak requires a2 "'" 7·1 fm, while a simultaneous fit to the ",-particle spectra following 8Li and 8B p-decays requires a2 "'" 6· 7 fm. For the best overall fit with a2 = 6·75 fm, the first 2+ excited state is at 2· 84 MeV excitation energy with a width at half maximum of 1·30 MeV. It is shown that data from other reactions which appeared to give much larger widths for this level can be fitted using the same R-matrix parameters. A second 2+ excited state is obtained at about 9 MeV with a width of about 10 MeV. Properties of the narrow 2+ states at 16·6 and 16·9 MeV are also discussed.

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“…This is indicative of a shared structure for the Hoyle state and 8 Be daughter. Indeed, the Hoyle state has a reduced α-decay width of approximately 100% when compared to the first Wigner sum rule (or single-particle limit) [11,12]. The clustered nature of the 8 Be ground-state has been within reach of ab initio calculations starting with a nucleon-nucleon interaction and using the Green's Function Monte Carlo (GFMC) approach.…”

Section: Clustering and The Hoyle Statementioning

confidence: 98%

Who plays in the Hoyle band?

Kokalova

2014

EPJ Web of Conferences

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Abstract. The Hoyle state in 12 C was discovered over 50 years ago in 1957 and strongly influences the rate of the triple-alpha process in stars. Recently, significant experimental and theoretical effort has been invested to understand, in detail, its unorthodox structure. In particular, identification of excitations of the Hoyle state has been a key goal. This paper addresses the current progress with an emphasis on possible members of the Hoyle band and the structure implications.

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Investigation of Excited States inBe8by Alpha-Particle Scattering from He

Cited by 107 publications

References 40 publications

Ab initio alpha–alpha scattering

Ab initio alpha–alpha scattering

2+ States of 8Be

Who plays in the Hoyle band?

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