Isomer spectroscopy at RI beam line in RCNP
Odahara, A (reprint author), Osaka Univ, Dept Phys, Osaka 5600043, Japan Modern Physics Letters A
(Impact Factor: 1.2).
07/2010; 25(21):1951-1954. DOI: 10.1142/S0217732310000721
Experiments based on the isomer-spectroscopy method were performed using the secondary beam line at RCNP, Osaka University. Recently, a new gamma-ray spectroscopy method was established using fusion reaction induced by low-energy RI beam. This method enablesus to study high-spin states of nuclei in wider mass region where it is difficult to populate them by using the combination of stable beams and stable targets. This method works well although low production of nuclei, because (1) the combination of beams and targets can be selected with large-reaction cross section and (2) high-S/N measurement can be performed by the event-by-event detection to select the events correlated with RI beam, which reduces background gamma rays, competing with gamma rays emitted from fusion products. As the first step, high-spin states of (142)Pr were studied using fusion reaction induced by low-energy (17)N RI beam. Large cross section was obtained by the (130)Te((17)N,5n) reaction with 4.9 MeV/u (17)N beam. Event selection, which was carried out by the event-by-event detection with low-beam intensity of 2x10(4) pps, enables high-S/N measurement.
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