Speaker
Dr
Atsuko Odahara
(Dep. of Phys. , Osaka Univ.)
Description
Low-energy (around 5-10 MeV/u) RI beams for in-beam $\gamma$-ray spectroscopy is expected to be one of the effective tools to study high-spin states of nuclei in wider mass region. Although RI beams have a disadvantage in statistics by the low-beam intensity, RI beams have an advantage in significant S/N improvement, such as the selection of the largest cross section of fusion reaction and the event-by-event detection of $\gamma$-rays correlated with the RI beam.
Two experiments were performed using the fusion reaction induced by $^{17}$N RI beam
at the RCNP fragment separator, EN beam line in RCNP, Osaka University. As the RI beam was produced by the direct reaction of $^9$Be($^{18}$O,$^{17}$N)$^{10}$B using low-energy primary beam, higher beam-energy resolution and smaller beam-spot size were achieved. High-spin states in $^{142}$Pr with $N$ = 83 and in $^{136}$Ba with $N$ = 80 were populated by using $^{130}$Te($^{17}$N,5n) and $^{124}$Sn($^{17}$N,p4n) reactions, respectively.
Performance of the RI beam production and the measurement based on the $\gamma$-ray spectroscopy method will be presented in this talk.
Primary author
Dr
Atsuko Odahara
(Dep. of Phys. , Osaka Univ.)
Co-authors
A. Takashima
(Dep. of Phys. , Osaka Univ.)
C. Petrache
(Univ. of Paris Sud, France)
D. Beaumel
(IPN Orsay, France)
D. Curien
(IPHC Strasbourg, France)
D. Guinet
(IPN Lyon, France)
E. Ideguchi
(CNS, Univ. of Tokyo)
G. Lehaut
(IPN Lyon, France)
H. Nishibata
(Dep. of Phys. , Osaka Univ.)
H. Watanabe
(RIKEN)
J. Takatsu
(Dep. of Phys. , Osaka Univ.)
K. Kura
(Dep. of Phys. , Osaka Univ.)
K. Tajiri
(Dep. of Phys. , Osaka Univ.)
K. Yoshinaga
(Tokyo Univ. of Sci.)
M. Suga
(Dep. of Phys. , Osaka Univ.)
N. Hamatani
(Dep. of Phys. , Osaka Univ.)
P. Desesquelles
(CSNSM Orsay, France)
R. Leguillon
(Univ. of Paris Sud, France)
R. Yokoyama
(CNS, Univ. of Tokyo)
S. Go
(CNS, Univ. of Tokyo)
S. Nishimura
(RIKEN)
T. Shimoda
(Dep. of Phys. , Osaka Univ.)
T. Suzuki
(RCNP, Osaka Univ.)
Y. Gono
(RIKEN)
Y. Ito
(Dep. of Phys. , Osaka Univ.)
Y. Wakabayashi
(JAEA)
