Identification of 45 New Neutron-Rich Isotopes Produced by In-Flight Fission of a 238U Beam at 345 MeV/nucleon

TL;DR

This study used in-flight fission of a 238U beam at 345 MeV/nucleon to discover 45 new neutron-rich isotopes, expanding the known nuclear landscape with advanced separation and detection techniques.

Contribution

It reports the first identification of 45 new neutron-rich isotopes using the BigRIPS separator at RIKEN, demonstrating the effectiveness of in-flight fission for isotope discovery.

Findings

Discovered 45 new neutron-rich isotopes.

Utilized the BigRIPS separator for isotope identification.

Expanded the known nuclear chart in the neutron-rich region.

Abstract

A search for new isotopes using in-flight fission of a 345 MeV/nucleon 238U beam has been carried out at the RI Beam Factory at the RIKEN Nishina Center. Fission fragments were analyzed and identified by using the superconducting in-flight separator BigRIPS. We observed 45 new neutron-rich isotopes: 71Mn, 73,74Fe, 76Co, 79Ni, 81,82Cu, 84,85Zn, 87Ga, 90Ge, 95Se, 98Br, 101Kr, 103Rb, 106,107Sr, 108,109Y, 111,112Zr, 114,115Nb, 115,116,117Mo, 119,120Tc, 121,122,123,124Ru, 123,124,125,126Rh, 127,128Pd, 133Cd, 138Sn, 140Sb, 143Te, 145I, 148Xe, and 152Ba.