Observation of magnetic rotational band in ¹³¹Xe

In shears mechanism, the observed angular momenta along a band are generated by the gradual closing of the quasi proton and quasi neutron angular momentum blades i.e. gradual alignment towards the total angular momentum. Xe isotopes in mass 130 region can be considered as a candidate to exhibit magnetic rotational nature at moderately high spin. Available high-j orbital such as h_11/2 for both proton particle and neutron holes can possibly act as two angular momentum blades in order to generate high spin states. Such dipole band at high spin was observed in ¹²³Xe (N=69), and proposed to be magnetic rotational one involving πh_11/2 particles and νh_11/2 holes. As one approaches N=82 shell closure, the expected spherical shape of the nucleus makes it favorable to have shears mechanism. In this connection ¹³¹Xe (N=77) is an ideal candidate to look for such magnetic rotational bands