Development of a measurement system for the determination of () cross-sections using multi-nucleon transfer reactions

Makii, Hiroyuki   ; Ota, Shuya*; Ishii, Tetsuro  ; Wakabayashi, Yasuo*; Furutaka, Kazuyoshi  ; Nishio, Katsuhisa   ; Nishinaka, Ichiro; Chiba, Satoshi; Igashira, Masayuki*; Czeszumska, A.*

We have installed new experimental apparatus to measure rays from highly excited states populated by the multi-nucleon transfer reactions with heavy-ion projectiles to determine the () cross sections by means of the surrogate reaction method. Apparatus consists of two anti-Compton LaBr(Ce) spectrometers to measure the rays and a Si - detector system to detect outgoing projectile-like particles. Reactions of 153-MeV O beams with Gd and Gd targets were used to study the performance of apparatus. By using the LaBr(Ce) scintillators with relatively large volume (101.6 mm in diameter and 127 mm in length), we have successfully measured rays from the compound nuclei, which have excitation energy above neutron separation energy, populated by Gd(O, O)Gd and Gd(O, O)Gd two-neutron transfer reactions. The present study has demonstrated high capability of apparatus to measure the de-excitation rays in the compound nuclei produced by the multi-nucleon transfer reactions for determination of the () cross sections by using the surrogate reaction method.