Orateur
Description
The $^{10}$Be(t,p)$^{12}$Be reaction has been studied with the SOLARIS solenoidal spectrometer. This measurement was carried out in inverse kinematics using a 9.6 MeV/u $^{10}$Be beam provided by the ReA6 re-accelerator in stand-alone mode. SOLARIS provides excellent resolution (about 150 keV FWHM) and background rejection capabilities via recoil detection. A titanium tritide target was used. The advantages of this approach, contrasted to the classic study of this reaction in normal kinematics, are higher bombarding energies coupled with recoil detection, allowing for a clean Q-value spectrum and insights into the decay of unbound states in $^{12}$Be. We observed the well-known bound states of $^{12}$Be and known states above the one- and two-neutron separation energies along with some additional, weakly populated states. Using angular distributions and coincident recoils ($^{10}$Be, $^{11}$Be), we favor spin-parity assignments of 3- and 4+ for the states at 4.58 and 5.72 MeV, respectively. We observe states at approximately 5.0 MeV and 5.4 MeV which have not been clearly observed before. The SOLARIS device, the analysis procedure, and the preliminary results are discussed.
This material is based upon work supported by NSF’s National Superconducting Cyclotron Laboratory which is a major facility fully funded by the National Science Foundation under award PHY-1565546; the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under Contract Number DE-AC02-06CH11357 (Argonne) and under Award Number DE-SC0014552 (UConn); the Spanish Ministerio de Economía y Competitividad through the Programmes “Ramón y Cajal” with the grant number RYC2019-028438-I; the UK Science and Technology Facilities Council (Grant No. ST/P004423/1); and the International Technology Center Pacific (ITC-PAC) under Contract No. FA520919PA138. SOLARIS is funded by DOE Office of Science under the FRIB Cooperative Agreement DE-SC0000661. The Paul Scherrer Institut is acknowledged for their provision of the $^{10}$Be isotope.
