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Description
Three reactions,$^{32}$Si(t,p)$^{34}$Si, $^{32}$Si($^{3}$He,d)$^{33}$P with the SOLARIS spectrometer and $^{34}$S(t,p)$^{36}$S with the HELIOS spectrometer, were measured in inverse kinematics at a 6.3 MeV/u incident energy in order to investigate the structure of nuclei around the “island of inversion”. Outgoing proton and deuteron spectra were measured from an angular range of ~20-40 degrees and populated excited states of $^{34}$Si, $^{33}$P, and $^{36}$S were identified at energies up to 5-7 MeV. In conjunction with classical recoil identification, some machine learning methods were used, including anomaly detection and multi-class classification predictive modeling. Measured proton angular distributions for the most populated states are used in comparison with distorted wave Born approximations (DWBA) calculations, including DWUCK and PTOLEMY, to make tentative spin assignments and extract spectroscopic amplitudes.
This research used resources of ANL’s ATLAS facility, which is a DOE Office of Science User Facility. This work was supported by the US Department of Energy, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357. 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 Economia y Competitividad through the Programmes "Ramon y Cajal" with the grant number RYC2019-028438-I; the U.K. 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 the DOE Office of Science under the FRIB Cooperative Agreement DE-SC0000661.
