Analysis of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Li</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>8</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>(α,<i>n</i><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mrow><mml:mn>11</mml:mn></mml:mrow></mml:msup></mml

Rauscher, T.; Grün, K.; Krauss, H.; Kwasniewicz, E.

doi:10.1103/physrevc.45.1996

Cited by 18 publications

(25 citation statements)

References 25 publications

(22 reference statements)

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“…In both spectra the highest energy peak corresponds to the 8 Li ground state (J π =2 + ) and the next one is the 0.981 MeV, 1 + state. For α-α events there is also another peak which corresponds to the unbound 8 Li second excited state (3 + ) at 2.255 MeV. The obtained resolution, 500 keV for α-α and 800 keV for α-8 Li events, is sufficient to resolve these 8 Li states.…”

Section: Edp Sciencesmentioning

confidence: 86%

“…Similar large discrepancies exist between two different theoretical approaches [8,9]. With all the problems of direct measurements (radioactive 8 Li beam, 4 He gas target, detection of 11 B ions and/or neutrons) one should not expect highly accurate data soon.…”

Section: Edp Sciencesmentioning

confidence: 95%

“…With all the problems of direct measurements (radioactive 8 Li beam, 4 He gas target, detection of 11 B ions and/or neutrons) one should not expect highly accurate data soon. In the meantime any new information about the states involved may help to narrow the uncertainties and may provide an additional quality check of the data obtained from direct measurements.…”

Section: Edp Sciencesmentioning

confidence: 99%

“…In the meantime any new information about the states involved may help to narrow the uncertainties and may provide an additional quality check of the data obtained from direct measurements. Such an example, the 8 Li+α decay of 12 B states having excitation energy, E x , between 10 and 18 MeV, is presented here.…”

Section: Edp Sciencesmentioning

confidence: 99%

“…-The 7 Li+ 9 Be reaction measurements were performed in order to study 9 Be and 10 Be nuclei [10][11][12]. The data also provide high quality results for the 2α+ 8 Li exit channel, which offer useful information on the 12 B states. The measurements were performed at the Laboratori Nazionali del Sud using a 7 Li +++ beam (E=52 MeV, I=60-100 nA) and a self-supported beryllium target (400 µg/cm 2 ).…”

Section: Edp Sciencesmentioning

confidence: 99%

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⁸ Li + α decay of ¹² B and its possible astrophysical implications

et al. 2003

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Abstract. -The 12 B excitation energy spectrum has been obtained from coincidence measurements of the 9 Be+ 7 Li −→ 2α+ 8 Li reaction at E0=52 MeV. The decay of the states at excitations between 10 and 16 Mev into α+ 8 Li has been observed for the first time. Observed α-decay indicates possible cluster structure of the 12 B excited states. The influence of these states on the cross section of the astrophysically important 8 Li(α,n) 11 B and 9 Be+t reactions is discussed and the results are compared with existing results.Introduction. -Light nuclei are interesting in their own right as almost every nucleus possesses some unique properties which are fingerprints of its quantum structure. Their extremely varied structures, from spherical shell model shapes to prominent clustering, are a considerable challange to understand and model. Although light nuclei have been studied intensively for many decades, very limited and often contradictory information exist for many of them. That is also the case for 12 B nucleus. It is interesting to draw a comparison with its structure and structures of the 11 Be, 11 B, 12 Be and 12 C nuclei which all show prominent α-clustering. As an example, 11 B and 12 C nuclei are typical cluster nuclei and their α-decays were experimentally observed in many particle coincidence measurements some 40 years ago (e.g. [1, 2], for full list of the references see [3]). The helium decays of 12 Be nucleus were reported only recently [4], but there is no experimental results on the α-decays of 12 B. Some experimental indications for cluster structure of 12 B states come from the measurements of the 8 Li(α,n) 11 B reaction. According to inhomogenous models of big bang nucleosynthesis this reaction would have had a crucial role in the production of A ≥ 12 nuclides [5, and references therein]. Hence this reaction and the states of 12 B at excitations close to the α-8 Li separation energy (E s =10.001 MeV) have attracted special interest. The 1996 status of the results obtained from both direct and indirect measurements was critically reviewed in [6]. Results from a recent direct measurement of the reaction [7] disagree with the conclusions from [6]. The reaction cross section obtained in that exclusive measurement at c.m. energies between 1.5 and 7 MeV is almost a factor of 2 lower than that obtained in previous inclusive measurements.

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Section: Edp Sciencesmentioning

confidence: 86%

Section: Edp Sciencesmentioning

confidence: 95%

Section: Edp Sciencesmentioning

confidence: 99%

Section: Edp Sciencesmentioning

confidence: 99%