학술논문
Interpretation of metastable states in the N>70 Zr region
Document Type
Original Paper
Author
Browne, F.; Bruce, A. M.; Sumikama, T.; Nishizuka, I.; Nishimura, S.; Doornenbal, P.; Li, J. G.; Lorusso, G.; Söderström, P.-A.; Walker, P. M.; Watanabe, H.; Xu, F. R.; Daido, R.; Patel, Z.; Rice, S.; Sinclair, L.; Wu, J.; Xu, Z. Y.; Yagi, A.; Baba, H.; Chiga, N.; Carroll, R.; Didierjean, F.; Fang, Y.; Fukuda, N.; Gey, G.; Ideguchi, E.; Inabe, N.; Isobe, T.; Kameda, D.; Kojouharov, I.; Kurz, N.; Kubo, T.; Lalkovski, S.; Li, Z.; Lozeva, R.; Nishibata, N.; Odahara, A.; Podolyák, Zs.; Regan, P. H.; Roberts, O. J.; Sakurai, H.; Schaffner, H.; Simpson, G. S.; Suzuki, H.; Takeda, H.; Tanaka, M.; Taprogge, J.; Werner, V.; Wieland, O.
Source
The European Physical Journal A: Hadrons and Nuclei. 59(9)
Subject
Language
English
ISSN
1434-601X
Abstract
Isomeric states were observed in nuclei produced in an experiment at the RIKEN Nishina Center Radioactive Isotope Beam Factory following the in-flight fission of a 345 MeV/nucleon 238111E=283.1τ=0.326(63)μ112E=44.2τ=0.094(26)μ113E=135.4τ=0.846(80)μ115E=198.6τ=63(4)μγN>70108109113117119120122U beam. Isomers reported in nuclei spanning a predicted prolate-oblate shape change boundary, 238111E=283.1τ=0.326(63)μ112E=44.2τ=0.094(26)μ113E=135.4τ=0.846(80)μ115E=198.6τ=63(4)μγN>70108109113117119120122Zr (238111E=283.1τ=0.326(63)μ112E=44.2τ=0.094(26)μ113E=135.4τ=0.846(80)μ115E=198.6τ=63(4)μγN>70108109113117119120122keV; 238111E=283.1τ=0.326(63)μ112E=44.2τ=0.094(26)μ113E=135.4τ=0.846(80)μ115E=198.6τ=63(4)μγN>70108109113117119120122 238111E=283.1τ=0.326(63)μ112E=44.2τ=0.094(26)μ113E=135.4τ=0.846(80)μ115E=198.6τ=63(4)μγN>70108109113117119120122s), 238111E=283.1τ=0.326(63)μ112E=44.2τ=0.094(26)μ113E=135.4τ=0.846(80)μ115E=198.6τ=63(4)μγN>70108109113117119120122Nb (238111E=283.1τ=0.326(63)μ112E=44.2τ=0.094(26)μ113E=135.4τ=0.846(80)μ115E=198.6τ=63(4)μγN>70108109113117119120122 keV; 238111E=283.1τ=0.326(63)μ112E=44.2τ=0.094(26)μ113E=135.4τ=0.846(80)μ115E=198.6τ=63(4)μγN>70108109113117119120122 238111E=283.1τ=0.326(63)μ112E=44.2τ=0.094(26)μ113E=135.4τ=0.846(80)μ115E=198.6τ=63(4)μγN>70108109113117119120122s), 238111E=283.1τ=0.326(63)μ112E=44.2τ=0.094(26)μ113E=135.4τ=0.846(80)μ115E=198.6τ=63(4)μγN>70108109113117119120122Nb (238111E=283.1τ=0.326(63)μ112E=44.2τ=0.094(26)μ113E=135.4τ=0.846(80)μ115E=198.6τ=63(4)μγN>70108109113117119120122 keV; 238111E=283.1τ=0.326(63)μ112E=44.2τ=0.094(26)μ113E=135.4τ=0.846(80)μ115E=198.6τ=63(4)μγN>70108109113117119120122 238111E=283.1τ=0.326(63)μ112E=44.2τ=0.094(26)μ113E=135.4τ=0.846(80)μ115E=198.6τ=63(4)μγN>70108109113117119120122s), and 238111E=283.1τ=0.326(63)μ112E=44.2τ=0.094(26)μ113E=135.4τ=0.846(80)μ115E=198.6τ=63(4)μγN>70108109113117119120122Mo (238111E=283.1τ=0.326(63)μ112E=44.2τ=0.094(26)μ113E=135.4τ=0.846(80)μ115E=198.6τ=63(4)μγN>70108109113117119120122 keV; 238111E=283.1τ=0.326(63)μ112E=44.2τ=0.094(26)μ113E=135.4τ=0.846(80)μ115E=198.6τ=63(4)μγN>70108109113117119120122 238111E=283.1τ=0.326(63)μ112E=44.2τ=0.094(26)μ113E=135.4τ=0.846(80)μ115E=198.6τ=63(4)μγN>70108109113117119120122s), are compared to potential-energy surface calculations which gave a selection of low-lying configurations for each nucleus. Tentative assignments of ground and excited states were made based on energy similarities to the calculations, reduced transition probabilities of the decays, and constraints of transition multipolarities from 238111E=283.1τ=0.326(63)μ112E=44.2τ=0.094(26)μ113E=135.4τ=0.846(80)μ115E=198.6τ=63(4)μγN>70108109113117119120122-ray coincidence measurements. These assignments are suggestive of significant deformation being persistent for 238111E=283.1τ=0.326(63)μ112E=44.2τ=0.094(26)μ113E=135.4τ=0.846(80)μ115E=198.6τ=63(4)μγN>70108109113117119120122 in this region. In addition, isomers in 238111E=283.1τ=0.326(63)μ112E=44.2τ=0.094(26)μ113E=135.4τ=0.846(80)μ115E=198.6τ=63(4)μγN>70108109113117119120122Nb, 238111E=283.1τ=0.326(63)μ112E=44.2τ=0.094(26)μ113E=135.4τ=0.846(80)μ115E=198.6τ=63(4)μγN>70108109113117119120122Nb, 238111E=283.1τ=0.326(63)μ112E=44.2τ=0.094(26)μ113E=135.4τ=0.846(80)μ115E=198.6τ=63(4)μγN>70108109113117119120122Tc, 238111E=283.1τ=0.326(63)μ112E=44.2τ=0.094(26)μ113E=135.4τ=0.846(80)μ115E=198.6τ=63(4)μγN>70108109113117119120122Ru, 238111E=283.1τ=0.326(63)μ112E=44.2τ=0.094(26)μ113E=135.4τ=0.846(80)μ115E=198.6τ=63(4)μγN>70108109113117119120122Ru, 238111E=283.1τ=0.326(63)μ112E=44.2τ=0.094(26)μ113E=135.4τ=0.846(80)μ115E=198.6τ=63(4)μγN>70108109113117119120122Rh, and 238111E=283.1τ=0.326(63)μ112E=44.2τ=0.094(26)μ113E=135.4τ=0.846(80)μ115E=198.6τ=63(4)μγN>70108109113117119120122Rh, not spanning the prolate-oblate transition discussed, are presented.