skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Half-life measurements of several states in {sup 95,97}Sr,{sup 97,100,104}Zr,{sup 106}Mo, and {sup 148}Ce

Abstract

Half-lives T{sub 1/2} of states in {sup 95,97}Sr, {sup 97,100,104}Zr, {sup 106}Mo, and {sup 148}Ce, which decay by delayed {gamma} transitions, were determined by using a new time-gated triple {gamma} coincidence method. Transition energy dependent effects such as time walks, time jitters, amplitude walks, and possible timing fluctuations of Ge detectors that contribute to the width of the time window were taken into consideration by comparing prompt and delayed cascades with similar transition energies. It is shown that the normalized triple {gamma} coincidence counts of two prompt cascades with similar transition energies are similar. Also, it is observed that the real triple {gamma} coincidence counts in the prompt cascades change systematically with the widths of the coincidence time window and the transition energies. Half-lives of states in {sup 100,104}Zr were measured for the first time. The half-lives of states in the delayed cascades were determined by using the prompt cascades with transition energies similar to those in delayed cascades. The half-life of the 2{sup +} state in {sup 104}Zr is measured to be 2.0(3) ns. The B(E2;2{sup +}{yields}0{sup +})(e{sup 2} b{sup 2}) value and quadrupole deformation {beta}{sub 2} are 0.40(6) (e{sup 2} b{sup 2}) and 0.47(7), respectively. {sup 104}Zr hasmore » the most deformed 2{sup +} state among medium and heavy even-even nuclei, except for {sup 102}Sr. This method is only approximately valid, but it is believed to be generally within 10% of the true value.« less

Authors:
; ;  [1];  [1];  [2]; ;  [3];  [4];  [1];  [5]
  1. Physics Department, Vanderbilt University, Nashville, Tennessee 37235 (United States)
  2. (United States)
  3. Flerov Laboratory for Nuclear Reactions, JINR, Dubna (Russian Federation)
  4. Idaho National Laboratory, Idaho Falls, Idaho 83415 (United States)
  5. (China)
Publication Date:
OSTI Identifier:
20771442
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 73; Journal Issue: 4; Other Information: DOI: 10.1103/PhysRevC.73.044316; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; AMPLITUDES; CERIUM 148; COINCIDENCE METHODS; ENERGY DEPENDENCE; FLUCTUATIONS; GE SEMICONDUCTOR DETECTORS; HALF-LIFE; MOLYBDENUM 106; NUCLEAR DECAY; NUCLEAR DEFORMATION; QUADRUPOLES; STRONTIUM 102; STRONTIUM 97; ZIRCONIUM 104

Citation Formats

Hwang, J.K., Ramayya, A.V., Hamilton, J.H., Luo, Y.X., Lawrence Berkeley National Laboratory, Berkeley, California 94720, Daniel, A.V., Ter-Akopian, G.M., Cole, J.D., Zhu, S.J., and Department of Physics, Tsinghua University, Beijing 100084. Half-life measurements of several states in {sup 95,97}Sr,{sup 97,100,104}Zr,{sup 106}Mo, and {sup 148}Ce. United States: N. p., 2006. Web. doi:10.1103/PhysRevC.73.044316.
Hwang, J.K., Ramayya, A.V., Hamilton, J.H., Luo, Y.X., Lawrence Berkeley National Laboratory, Berkeley, California 94720, Daniel, A.V., Ter-Akopian, G.M., Cole, J.D., Zhu, S.J., & Department of Physics, Tsinghua University, Beijing 100084. Half-life measurements of several states in {sup 95,97}Sr,{sup 97,100,104}Zr,{sup 106}Mo, and {sup 148}Ce. United States. doi:10.1103/PhysRevC.73.044316.
Hwang, J.K., Ramayya, A.V., Hamilton, J.H., Luo, Y.X., Lawrence Berkeley National Laboratory, Berkeley, California 94720, Daniel, A.V., Ter-Akopian, G.M., Cole, J.D., Zhu, S.J., and Department of Physics, Tsinghua University, Beijing 100084. Sat . "Half-life measurements of several states in {sup 95,97}Sr,{sup 97,100,104}Zr,{sup 106}Mo, and {sup 148}Ce". United States. doi:10.1103/PhysRevC.73.044316.
@article{osti_20771442,
title = {Half-life measurements of several states in {sup 95,97}Sr,{sup 97,100,104}Zr,{sup 106}Mo, and {sup 148}Ce},
author = {Hwang, J.K. and Ramayya, A.V. and Hamilton, J.H. and Luo, Y.X. and Lawrence Berkeley National Laboratory, Berkeley, California 94720 and Daniel, A.V. and Ter-Akopian, G.M. and Cole, J.D. and Zhu, S.J. and Department of Physics, Tsinghua University, Beijing 100084},
abstractNote = {Half-lives T{sub 1/2} of states in {sup 95,97}Sr, {sup 97,100,104}Zr, {sup 106}Mo, and {sup 148}Ce, which decay by delayed {gamma} transitions, were determined by using a new time-gated triple {gamma} coincidence method. Transition energy dependent effects such as time walks, time jitters, amplitude walks, and possible timing fluctuations of Ge detectors that contribute to the width of the time window were taken into consideration by comparing prompt and delayed cascades with similar transition energies. It is shown that the normalized triple {gamma} coincidence counts of two prompt cascades with similar transition energies are similar. Also, it is observed that the real triple {gamma} coincidence counts in the prompt cascades change systematically with the widths of the coincidence time window and the transition energies. Half-lives of states in {sup 100,104}Zr were measured for the first time. The half-lives of states in the delayed cascades were determined by using the prompt cascades with transition energies similar to those in delayed cascades. The half-life of the 2{sup +} state in {sup 104}Zr is measured to be 2.0(3) ns. The B(E2;2{sup +}{yields}0{sup +})(e{sup 2} b{sup 2}) value and quadrupole deformation {beta}{sub 2} are 0.40(6) (e{sup 2} b{sup 2}) and 0.47(7), respectively. {sup 104}Zr has the most deformed 2{sup +} state among medium and heavy even-even nuclei, except for {sup 102}Sr. This method is only approximately valid, but it is believed to be generally within 10% of the true value.},
doi = {10.1103/PhysRevC.73.044316},
journal = {Physical Review. C, Nuclear Physics},
number = 4,
volume = 73,
place = {United States},
year = {Sat Apr 15 00:00:00 EDT 2006},
month = {Sat Apr 15 00:00:00 EDT 2006}
}