High resolution (3He,t) reaction on the double-beta decaying nucleus 136Xe

Puppe P, Frekers D, Adachi T, Akimune H, Aoi N, Bilgier B, Ejiri H, Fujita H, Fujita Y, Fujiwara M, Ganioglu E, Harakeh MN, Hatanaka K, Holl M, Kozer HC, Lee J, Lennarz A, Matsubara H, Miki K, Orrigo SEA, Suzuki T, Tamii A, Thies JH

Abstract

A (3He,t) charge-exchange reaction experiment on the double-beta decaying nucleus 136Xe hasbeen performed at an incident energy of 420 MeV with the objective to measure the Gamow-Teller(GT) strength distribution in 136Cs. The measurements have been carried out at the dispersion-matched WS beam line and the Grand Raiden spectrometer of the RCNP in Osaka, where an energy resolution of 42 keV was achieved. A new gas cell with thin windows made of polyethylenenaphthalate has been employed as a target. The extracted GT strength distribution is confronted with the rather long 2 neutrino double beta decay half-life of 136Xe.