Abstract
KISS (KEK Isotope Separation System) has been constructed at Nishina Re- search Center (NRC) of RIKEN to study the decay properties of heavy neutron-rich iso- topes with mass number around A� 200 along the neutron magic number of N = 126 for the astrophysical interest. The isotopes of interest will be produced by multi-nucleon transfer reactions in neutron-rich heavy ion collisions (e.g. 136 Xe projectile on 198 Pt tar- get). KISS consists of a gas-cell system for thermalizing (stopping and neutralizing) and fast-transporting reaction products to the gas cell exit hole, a laser system for the res- onant ionization, and a mass-separator system followed by a detection system for the decay spectroscopy. KISS will allow us to study unknown isotopes produced in weak re- action channels under low background conditions. The off-line test of the KISS has been finished. As a next step, on-line test experiments have been performed to investigate the overall efficiency and selectivity of the system as a function of the injected 56 Fe beam intensity from the RIKEN Ring Cyclotron (RRC).
Highlights
The beta-decay properties of nuclei with N = 126, which are believed to act as progenitors in the rapid neutron capture (r-) process path forming the third peak (A ≈ 195) in the observed elemental abundance pattern, are considered critical for clearly understanding astrophysical sites for the production of the heavy elements such as gold and platinum [1]
In the KEK Isotope Separation System (KISS) project, we employ a gas catcher to efficiently collect all reaction products, and we adopt laser resonance ionization technique to selectively ionize the nuclei with specific atomic numbers Z coupled to an electromagnetic separator (ISOL) to obtain the nuclei with specific mass numbers A [6, 7]
KISS has been constructed at the RIBF facility in RIKEN in the beginning of 2011
Summary
In order to investigate the effectiveness of the reaction system of 136Xe+198Pt, we performed reaction studies using the large acceptance magnetic spectrometer VAMOS++ and the high efficiency gamma detector array EXOGAM at GANIL [3]. These experimental results are reported in the present proceedings [4]. A large spread in the calculated emission angle was observed, and an average value of the emission angles of 65◦ in the laboratory frame was obtained These characteristics of the MNT reaction products make it difficult to collect the reaction products with N = 126 using an in-flight-type electromagnetic spectrometer. In the KISS project, we employ a gas catcher to efficiently collect all reaction products, and we adopt laser resonance ionization technique to selectively ionize the nuclei with specific atomic numbers Z coupled to an electromagnetic separator (ISOL) to obtain the nuclei with specific mass numbers A [6, 7]
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