ISF 2.07
Map of the energy of the first excited 2+ states in even-even nuclei. The 2+ energy reveals
the presence of shell closures. The shell gaps at nucleon numbers 28, 50, and 126 are clearly
visible by their relatively high excitation energy. The first 2+ states of even-even nuclei marked in
red are currently unknown and will be accessible at the ISF using Coulomb excitation, nucleon
knockout experiments, or β-decay studies.
Operation of NSCL as a national user facility is supported by the Experimental Nuclear Physics Program of the U.S. National Science Foundation.