Further measurement of the 7Be(p,γ)8B cross section at low energies with the coulomb dissociation of 8B

Nuclear astrophysics with radioactive beams

“…In a second experiment [325,326], the hodoscope was modified for higher count-rate capability and moved closer to expand the angular range covered from 6 • to 10 • . Also, the NaI(Tl) scintillator γ -ray detection array DALI was positioned around the target to tag the fraction of the breakup leading to the 429 keV bound excited state in 7 Be.…”

“…Also, the NaI(Tl) scintillator γ -ray detection array DALI was positioned around the target to tag the fraction of the breakup leading to the 429 keV bound excited state in 7 Be. The larger angular range covered by the hodoscope allowed for angular-distribution measurements and an assessment of the E2 contribution to the breakup process [325,326]. Similarly, the reactions 8 B(p, γ ) 9 C, 11 C(p, γ ) 12 N and 12 N(p, γ ) 13 O, important for the hot pp mode nuclear burning in hydrogen-rich, very massive objects [327], were studied via Coulomb breakup at RIKEN to extract the reaction rates relevant to explosive hydrogen burning [323].…”

“…Subsequent experiments at RIKEN were aimed at the Coulomb dissociation of 8 B [128,325,326] to extract the reaction rate of the crucial 7 Be(p, γ ) 8 B reaction, which is of great importance for the neutrino production in the Sun through the β decay of 8 B. In the first experiment in 1994, the breakup of a 8 B beam of 46.5 MeV/nucleon incident on a 50 mg/cm 2 208 Pb target, used a two-layered, x-y position-sensitive plastic-scintillator hodoscope with an active area of 1 × 0.96 m 2 for the detection of the coincident 7 Be+p breakup products.…”

Precise measurement of theBe7(p,γ)B8Junghans1, Mohrmann2, Snover3 et al. 2003Phys. Rev. C141342794View full textAdd to dashboardCite

“…Coulomb dissociation (CD) experiments, in which a secondary radioactive beam of 8 B nuclei is dissociated into 7 Be + p in the field of a heavy nucleus such as Au or Pb, have now been performed by several groups [16,17,18,19,20]. In these experiments, one attempts to avoid nuclear contributions by measuring at very small 8 B scattering angles.…”

“…ies of the 7 Be(p,γ) 8 B cross section [4,5,6,7,8,9,10,11,12,13,14,15], and indirect studies using Coulombbreakup [16,17,18,19,20] or peripheral heavy-ion transfer and breakup [21,22] reactions. The direct technique has the advantage that it studies the reaction that actually occurs in the sun, but is difficult experimentally because it requires a radioactive target or beam, and the cross sections are small.…”