Eur. Phys. J. A (2017) 53: 234
https://doi.org/10.1140/epja/i2017-12409-0

Regular Article - Experimental Physics

New levels and reinvestigation of octupole correlations in ^146,147La

¹ Department of Physics and Astronomy, Vanderbilt University, 37235, Nashville, TN, USA
² Department of Physics, Furman University, 29613, Greenville, SC, USA
³ Lawrence Berkeley National Laboratory, 94720, Berkeley, CA, USA
⁴ Department of Physics, Tsinghua University, 100084, Beijing, China
⁵ Joint Institute for Nuclear Research, RU-141980, Dubna, Russia

^* e-mail: enhong.wang@vanderbilt.edu

Received: 27 May 2017
Accepted: 7 October 2017
Published online: 6 December 2017

Abstract

High spin states of neutron-rich ^146,147La have been reinvestigated by -- and --- coincidence data from a ²⁵²Cf spontaneous fission experiment by using Gammasphere. Thirty-two new transitions in ¹⁴⁶La are observed. Two new bands in ¹⁴⁶La have been established. One of them is proposed to be the octupole parity partner of the previously known band. Twenty new transitions in ¹⁴⁷La are observed. The ground state band of ¹⁴⁷La has been established with a proposed band-head. Angular correlation of cascades has been used to study the spins and parities of the states. The B(E1)/B(E2) ratios and dipole moments of bands in ^{146, 147}La have been measured.