TY - JOUR
TI - Dominance of direct reaction channels at deep sub-barrier energies for
weakly bound nuclei on heavy targets: The case B-8 + Pb-208
AU - Pakou, A.
AU - Acosta, L.
AU - O'Malley, P. D.
AU - Aguilar, S. and
AU - Aguilera, E. F.
AU - Baines, M.
AU - Bardayan, D.
AU - Becchetti, F. D. and
AU - Boomershine, Ch
AU - Brodeur, M.
AU - Cappuzzello, F.
AU - Carmichael, S.
AU - and Caves, L.
AU - Chavez, E.
AU - Flores-Vazquez, C.
AU - Gula, A. and
AU - Kolata, J. J.
AU - Liu, B.
AU - Marin-Lambarri, D. J.
AU - Morales, F. F.
AU - and Rusek, K.
AU - Sanchez-Benitez, A. M.
AU - Sgouros, O.
AU - Sharma, V.
AU - R.
AU - Soukeras, V
AU - Souliotis, G.
JO - Physical Review C
PY - 2020
VL - 102
TODO - 3
SP - null
PB - AMER PHYSICAL SOC
SN - 2469-9985, 2469-9993
TODO - 10.1103/PhysRevC.102.031601
TODO - null
TODO - We report the first evidence of breakup dominance at deep sub-barrier
energies for the proton halo nucleus B-8 on a heavy target. Angular
distribution measurements of the B-8 breakup fragment, Be-7, on lead
were performed at the TwinSol facility of the University of Notre Dame
at a beam energy of 30 MeV, 58% of the Coulomb barrier and
corresponding to a distance of closest approach of 20.5 fm. The Be-7
yield was observed in two double sided silicon strip detector telescopes
symmetrical to the radioactive beam and normalized using the B-8
Rutherford scattering. The results are in excellent agreement with
continuum discretized coupled channel calculations with a total breakup
cross section (326 +/- 84) mb. This is found to exhaust all of the total
reaction cross section for the system B-8 + (208)pb, possibly
prohibiting a fusion enhancement. This finding is expected to give more
insight to the puzzle of fusion suppression at deep sub-barrier energies
with possible major consequences on nuclear astrophysics.
ER -