Nuclear shape and structure in neutron-rich {sup 110,111}Tc
Abstract
The high-spin nuclear structure of Tc isotopes is extended to more neutron-rich regions based on the measurements of prompt {gamma} rays from the spontaneous fission of {sup 252}Cf at the Gammasphere. The high-spin level scheme of N=67 neutron-rich {sup 110}Tc (Z=43) is established for the first time, and that of {sup 111}Tc is extended and expanded. The ground band of {sup 111}Tc reaches the band-crossing region, and the new observation of the weakly populated {alpha}=-1/2 member of the band provides important information on signature splitting. The systematics of band crossings in the isotopic and isotonic chains and a CSM calculation suggest that the band crossing of the ground band of {sup 111}Tc is due to alignment of a pair of h{sub 11/2} neutrons. The best fit to signature splitting, branching ratios, and excitations of the ground band of {sup 111}Tc by the rigid triaxial rotor plus particle model calculations result in a shape of {epsilon}{sub 2}=0.32 and {gamma}=-26 deg. for this nucleus. Its triaxiality is larger than that of {sup 107,109}Tc, which indicates increasing triaxiality in Tc isotopes with increasing neutron number. The identification of the weakly populated K+2 satellite band provides strong evidence for the large triaxiality of {supmore »
- Authors:
-
- Physics Department, Vanderbilt University, Nashville, Tennessee 37235 (United States)
- Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
- KU Leuven, Instituut voor Kern- en Stralingsfysica, Celestijnenlaan 200D, B-3001 Leuven (Belgium)
- Physics Department, Tsinghua University, Beijing 100084 (China)
- Department of Physics, National Tsing Hua University, Hsinchu, Taiwan (China)
- Mississippi State University, Drawer 5167, Mississippi State, Mississippi 39762 (United States)
- Flerov Laboratory for Nuclear Reactions, JINR, Dubna (Russian Federation)
- Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
- Universidade Federal do Rio de Janeiro, CP 68528, RG (Brazil)
- Institut fuer Kernphysik, Universitaet zu Koeln, D-50937, Cologne (Germany)
- Publication Date:
- OSTI Identifier:
- 20863704
- Resource Type:
- Journal Article
- Journal Name:
- Physical Review. C, Nuclear Physics
- Additional Journal Information:
- Journal Volume: 74; Journal Issue: 2; Other Information: DOI: 10.1103/PhysRevC.74.024308; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; BRANCHING RATIO; CALIFORNIUM 252; ENERGY LEVELS; EXCITATION; GAMMA RADIATION; KEV RANGE; NEUTRONS; NUCLEAR STRUCTURE; PARTICLE-CORE COUPLING MODEL; SPIN; SPONTANEOUS FISSION; TECHNETIUM 108; TECHNETIUM 109; TECHNETIUM 110; TECHNETIUM 111
Citation Formats
Luo, Y X, Lawrence Berkeley National Laboratory, Berkeley, California 94720, Hamilton, J H, Ramayya, A V, Hwang, J K, Gore, P M, Jones, E F, Fong, D, Rasmussen, J O, Lee, I Y, Stefanescu, I, Che, X L, Zhu, S J, Physics Department, Tsinghua University, Beijing 100084, Joint Institute for Heavy Ion Research, Oak Ridge, Tennessee 37831, Wu, S C, Ginter, T N, National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, Ma, W C, Ter-Akopian, G M, Daniel, A V, Stoyer, M A, Donangelo, R, and Gelberg, A. Nuclear shape and structure in neutron-rich {sup 110,111}Tc. United States: N. p., 2006.
Web. doi:10.1103/PHYSREVC.74.024308.
Luo, Y X, Lawrence Berkeley National Laboratory, Berkeley, California 94720, Hamilton, J H, Ramayya, A V, Hwang, J K, Gore, P M, Jones, E F, Fong, D, Rasmussen, J O, Lee, I Y, Stefanescu, I, Che, X L, Zhu, S J, Physics Department, Tsinghua University, Beijing 100084, Joint Institute for Heavy Ion Research, Oak Ridge, Tennessee 37831, Wu, S C, Ginter, T N, National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, Ma, W C, Ter-Akopian, G M, Daniel, A V, Stoyer, M A, Donangelo, R, & Gelberg, A. Nuclear shape and structure in neutron-rich {sup 110,111}Tc. United States. https://doi.org/10.1103/PHYSREVC.74.024308
Luo, Y X, Lawrence Berkeley National Laboratory, Berkeley, California 94720, Hamilton, J H, Ramayya, A V, Hwang, J K, Gore, P M, Jones, E F, Fong, D, Rasmussen, J O, Lee, I Y, Stefanescu, I, Che, X L, Zhu, S J, Physics Department, Tsinghua University, Beijing 100084, Joint Institute for Heavy Ion Research, Oak Ridge, Tennessee 37831, Wu, S C, Ginter, T N, National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, Ma, W C, Ter-Akopian, G M, Daniel, A V, Stoyer, M A, Donangelo, R, and Gelberg, A. 2006.
"Nuclear shape and structure in neutron-rich {sup 110,111}Tc". United States. https://doi.org/10.1103/PHYSREVC.74.024308.
@article{osti_20863704,
title = {Nuclear shape and structure in neutron-rich {sup 110,111}Tc},
author = {Luo, Y X and Lawrence Berkeley National Laboratory, Berkeley, California 94720 and Hamilton, J H and Ramayya, A V and Hwang, J K and Gore, P M and Jones, E F and Fong, D and Rasmussen, J O and Lee, I Y and Stefanescu, I and Che, X L and Zhu, S J and Physics Department, Tsinghua University, Beijing 100084 and Joint Institute for Heavy Ion Research, Oak Ridge, Tennessee 37831 and Wu, S C and Ginter, T N and National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824 and Ma, W C and Ter-Akopian, G M and Daniel, A V and Stoyer, M A and Donangelo, R and Gelberg, A},
abstractNote = {The high-spin nuclear structure of Tc isotopes is extended to more neutron-rich regions based on the measurements of prompt {gamma} rays from the spontaneous fission of {sup 252}Cf at the Gammasphere. The high-spin level scheme of N=67 neutron-rich {sup 110}Tc (Z=43) is established for the first time, and that of {sup 111}Tc is extended and expanded. The ground band of {sup 111}Tc reaches the band-crossing region, and the new observation of the weakly populated {alpha}=-1/2 member of the band provides important information on signature splitting. The systematics of band crossings in the isotopic and isotonic chains and a CSM calculation suggest that the band crossing of the ground band of {sup 111}Tc is due to alignment of a pair of h{sub 11/2} neutrons. The best fit to signature splitting, branching ratios, and excitations of the ground band of {sup 111}Tc by the rigid triaxial rotor plus particle model calculations result in a shape of {epsilon}{sub 2}=0.32 and {gamma}=-26 deg. for this nucleus. Its triaxiality is larger than that of {sup 107,109}Tc, which indicates increasing triaxiality in Tc isotopes with increasing neutron number. The identification of the weakly populated K+2 satellite band provides strong evidence for the large triaxiality of {sup 111}Tc. In {sup 110}Tc, the four lowest-lying levels observed are very similar to those in {sup 108}Tc. At an excitation of 478.9 keV above the lowest state observed, ten states of a {delta}I=1 band are observed. This band of {sup 110}Tc is very analogous to the {delta}I=1 bands in {sup 106,108}Tc, but it has greater and reversal signature splitting at higher spins.},
doi = {10.1103/PHYSREVC.74.024308},
url = {https://www.osti.gov/biblio/20863704},
journal = {Physical Review. C, Nuclear Physics},
issn = {0556-2813},
number = 2,
volume = 74,
place = {United States},
year = {Tue Aug 15 00:00:00 EDT 2006},
month = {Tue Aug 15 00:00:00 EDT 2006}
}