|
| |
FIZIKA B 12 (2003) 2, 153 - 164
 
a-PARTICLE DECAY OF 10B AND 12B
OBSERVED IN 9Be +7Li REACTIONS
NEVEN SOIĆa, SILVIO CHERUBINIb, MARCELLO LATTUADAb,
ĐURO MILJANIĆa, STEFANO ROMANOb, CLAUDIO SPITALERIb
and MILE ZADROa
aRuđer Bošković Institute, Zagreb, Croatia
bINFN-Laboratori Nazionali del Sud and Universita di Catania, Catania, Italy
Received 18 June 2003; revised manuscript received 21 August 2003
Accepted 1 December 2003 Online 3 March 2004
The 10B and 12B excitation energy spectra have been obtained from
the inclusive and coincident measurements of the 9Be +7Li
reactions at Ebeam=52 MeV. Contributions of the 10B
states below 10 MeV and of the 12B states below 16 MeV excitation have been
resolved. 10B states at 4.77 and 6.56 MeV as well as groups of states around
5.1 and 6 MeV decaying into a +6Li, and of the
state at 7.0 MeV decaying into a +6Li*
have been found. These measurements give the first evidence for a +8Li
decay of the 12B states. In our data, there is no evidence for the a +8Li*(0.98 MeV) and a +8Li*(2.26
MeV) decays of 12B. The influence of a-decaying 12B
states on the cross section of the astrophysically important 8Li(a,n)11B reaction is discussed.
PACS numbers: 21.10.-k, 25.70.-z, 27.20.+n
UDC 539.144, 539.172
Keywords: nuclear reactions, 9Be +7Li, Ebeam=52 MeV, 10B and 12B levels, a +6Li, a +6Li*
and a +8Li decays
|
