INVESTIGATION OF THE (10B,6Li* (3+, 2.18 MeV)) REACTION AS A METHOD FOR alpha-CLUSTER TRANSFER STUDIES Page: 4 of 16
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LBL-11194
In order to observe the 6Li*(2.18 MeV) state it is
necessary to detect its decay products. Since the only breakup
threshold below the 6Li*(2.18 MeV) state is that of d + a lying
1.47 MeV above the ground state, the 2.18 MeV(3 ) state [9]
(hereafter referred to as 6Li*) will decay into this channel
with a relative energy e between the d and a fragments of 0.71
MeV. In the laboratory system the 6Li* decay products are
confined to a cone centered around the 6Li* center-of-mass
direction. The maximum opening angle for this cone is given by
Amax = 2 sin [(2 /E)1/2
where e = 0.71 MeV and E is the 6Li* laboratory energy. A
reasonably efficient method for detecting the d + a products is
to arrange two particle telescopes in a close vertical geometry
(with respect to the scattering plane). This geometry is chosen
so that the counter telescopes subtend a good portion of the
Li* breakup cone and yet limit the kinematic broadening.
Figure 1(a) presents a schematic representation of the detection
system used in this work.
Each counter telescope consisted of a 200 um AE, a 3mm E
and a 400 um reject counter (the last is not illustrated in Fig.
1(a)). The counter telescopes were collimated by 3mm wide and
10mm high slits which were separated by 10mm. At 11.5 cm
distance from the target the horizontal acceptance angle of
this system was 1.50. The timing resolution between the two AE
counters was approximately 1 ns. Fast pileup rejectors were-3-
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Bice, A. N.; Shotter, A. C.; Stahel, D. P. & Cerny, Joseph. INVESTIGATION OF THE (10B,6Li* (3+, 2.18 MeV)) REACTION AS A METHOD FOR alpha-CLUSTER TRANSFER STUDIES, article, July 1, 1980; Berkeley, California. (https://digital.library.unt.edu/ark:/67531/metadc836074/m1/4/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.