Momentum distribution of 15B fragments from the breakup of 17B.
The two-neutron removal cross section (sigma(-2n)) and the longitudinal momentum distribution of 15B fragments from the breakup of 17B on 9Be were measured at 70A MeV. The distribution in the projectile rest frame is characterized by a FWHM of 80+/-10 MeV/c for 15B. The sigma(-2n) is found to be 0.22+/-0.05 b. A Glauber-type analysis of the data provides clear evidence of a two-neutron halo structure in 17B.
Suzuki
T
T
Department of Physics, Niigata University, Niigata 950-2181, Japan.
Ogawa
Y
Y
Chiba
M
M
Fukuda
M
M
Iwasa
N
N
Izumikawa
T
T
Kanungo
R
R
Kawamura
Y
Y
Ozawa
A
A
Suda
T
T
Tanihata
I
I
Watanabe
S
S
Yamaguchi
T
T
Yamaguchi
Y
Y