Journal
PHYSICS LETTERS B
Volume 672, Issue 3, Pages 230-234Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physletb.2009.01.033
Keywords
RI beam; Proton resonance scattering; 7 Be(p.gamma)B-8; Solar neutrino
Funding
- Young Scientists [17740135]
- Grants-in-Aid for Scientific Research [21340053, 17740135] Funding Source: KAKEN
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A new measurement of proton resonance scattering on Be-7 was performed tip to the center-of-mass energy of 6.7 MeV using the low-energy RI beam facility CRIB (CNS Radioactive Ion Beam separator) at the Center for Nuclear Study of the University of Tokyo. The excitation function of Be-7 + p elastic scattering above 3.5 MeV was measured Successfully for the first time, providing important information about the resonance structure of the B-8 nucleus. The resonances are related to the reaction rate of Be-7(p.gamma)B-8. which is the key reaction in solar B-8 neutrino production. Evidence for the presence of two negative parity states is presented. One of them is a 2(-) state observed as a broad s-wave resonance, the existence of which had been questionable. Its possible effects on the determination of the astrophysical S-factor of Be-7(p.gamma)B-8 at solar energy are discussed. The other state had not been observed in previous measurements, and its spin and parity were determined as 1(-). (C) 2009 Elsevier B.V. All rights reserved.
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