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Title: Identification of the slow E3 transition {sup 136}Cs{sup m{yields}136}Cs with conversion electrons

Abstract

We performed at ISOLDE the spectroscopy of the decay of the 8{sup -} isomer in {sup 136}Cs by {gamma} and conversion-electron detection. For the first time the excitation energy of the isomer and the multipolarity of its decay have been measured. The half-life of the isomeric state was remeasured to T{sub 1/2}=17.5(2) s. This isomer decays via a very slow 518-keV E3 transition to the ground state. In addition to this, a much weaker decay branch via a 413-keV M4 and a subsequent 105-keV E2 transition has been found. Thus we have found a new level at 105 keV with spin 4{sup +} between the isomeric and the ground state. The results are discussed in comparison to shell-model calculations.

Authors:
 [1];  [2];  [3];  [4];  [5];  [2];  [5]; ; ; ;  [1];  [6];  [7];  [8];  [9];  [10];  [9]
  1. Fakultaet fuer Physik, Ludwig-Maximilians-Universitaet Muenchen, D-85748 Garching (Germany)
  2. (Germany)
  3. Institut Laue Langevin, F-38042 Grenoble Cedex 9 (France)
  4. Department of Chemistry, University of Oslo, N-0315 Oslo (Norway)
  5. Physik Department E12, Technische Universitaet Muenchen, D-85748 Garching (Germany)
  6. Department of Nuclear and Particle Physics, Uppsala University, S-75121 Uppsala (Sweden)
  7. Department of Physics, Bengal Engineering and Science University, Shibpur, Howrah 711103 (India)
  8. Nuclear and Atomic Physics Division, Saha Institute of Nuclear Physics, Kolkata 700064 (India)
  9. Grand Accelerateur National d'Ions Lourds, CEA/DSM-CNRS/IN2P3, B.P. 55027, F-14076 Caen Cedex 5 (France)
  10. (India)
Publication Date:
OSTI Identifier:
21596575
Resource Type:
Journal Article
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 84; Journal Issue: 1; Other Information: DOI: 10.1103/PhysRevC.84.014329; (c) 2011 American Institute of Physics; 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; CESIUM 136; COMPARATIVE EVALUATIONS; CONVERSION; E2-TRANSITIONS; E3-TRANSITIONS; ELECTRON DETECTION; ELECTRONS; EXCITATION; GROUND STATES; HALF-LIFE; ISOMERS; KEV RANGE 100-1000; MULTIPOLARITY; SHELL MODELS; SPECTROSCOPY; SPIN; ANGULAR MOMENTUM; BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; CESIUM ISOTOPES; CHARGED PARTICLE DETECTION; DAYS LIVING RADIOISOTOPES; DETECTION; ELEMENTARY PARTICLES; ENERGY LEVELS; ENERGY RANGE; ENERGY-LEVEL TRANSITIONS; EVALUATION; FERMIONS; INTERMEDIATE MASS NUCLEI; ISOMERIC TRANSITION ISOTOPES; ISOTOPES; KEV RANGE; LEPTONS; MATHEMATICAL MODELS; MULTIPOLE TRANSITIONS; NUCLEAR MODELS; NUCLEI; ODD-ODD NUCLEI; PARTICLE PROPERTIES; RADIATION DETECTION; RADIOISOTOPES; SECONDS LIVING RADIOISOTOPES

Citation Formats

Wimmer, K., Physik Department E12, Technische Universitaet Muenchen, D-85748 Garching, Koester, U., Hoff, P., Kroell, Th., Institut fuer Kernphysik, Technische Universitaet Darmstadt, D-64289 Darmstadt, Kruecken, R., Lutter, R., Morgan, Th., Schwerdtfeger, W., Thirolf, P. G., Mach, H., Sarkar, S., Sarkar, M. Saha, Srivastava, P. C., Nuclear Physics Group, Department of Physics, University of Allahabad, Allahabad 211002, and Van Isacker, P.. Identification of the slow E3 transition {sup 136}Cs{sup m{yields}136}Cs with conversion electrons. United States: N. p., 2011. Web. doi:10.1103/PHYSREVC.84.014329.
Wimmer, K., Physik Department E12, Technische Universitaet Muenchen, D-85748 Garching, Koester, U., Hoff, P., Kroell, Th., Institut fuer Kernphysik, Technische Universitaet Darmstadt, D-64289 Darmstadt, Kruecken, R., Lutter, R., Morgan, Th., Schwerdtfeger, W., Thirolf, P. G., Mach, H., Sarkar, S., Sarkar, M. Saha, Srivastava, P. C., Nuclear Physics Group, Department of Physics, University of Allahabad, Allahabad 211002, & Van Isacker, P.. Identification of the slow E3 transition {sup 136}Cs{sup m{yields}136}Cs with conversion electrons. United States. doi:10.1103/PHYSREVC.84.014329.
Wimmer, K., Physik Department E12, Technische Universitaet Muenchen, D-85748 Garching, Koester, U., Hoff, P., Kroell, Th., Institut fuer Kernphysik, Technische Universitaet Darmstadt, D-64289 Darmstadt, Kruecken, R., Lutter, R., Morgan, Th., Schwerdtfeger, W., Thirolf, P. G., Mach, H., Sarkar, S., Sarkar, M. Saha, Srivastava, P. C., Nuclear Physics Group, Department of Physics, University of Allahabad, Allahabad 211002, and Van Isacker, P.. Fri . "Identification of the slow E3 transition {sup 136}Cs{sup m{yields}136}Cs with conversion electrons". United States. doi:10.1103/PHYSREVC.84.014329.
@article{osti_21596575,
title = {Identification of the slow E3 transition {sup 136}Cs{sup m{yields}136}Cs with conversion electrons},
author = {Wimmer, K. and Physik Department E12, Technische Universitaet Muenchen, D-85748 Garching and Koester, U. and Hoff, P. and Kroell, Th. and Institut fuer Kernphysik, Technische Universitaet Darmstadt, D-64289 Darmstadt and Kruecken, R. and Lutter, R. and Morgan, Th. and Schwerdtfeger, W. and Thirolf, P. G. and Mach, H. and Sarkar, S. and Sarkar, M. Saha and Srivastava, P. C. and Nuclear Physics Group, Department of Physics, University of Allahabad, Allahabad 211002 and Van Isacker, P.},
abstractNote = {We performed at ISOLDE the spectroscopy of the decay of the 8{sup -} isomer in {sup 136}Cs by {gamma} and conversion-electron detection. For the first time the excitation energy of the isomer and the multipolarity of its decay have been measured. The half-life of the isomeric state was remeasured to T{sub 1/2}=17.5(2) s. This isomer decays via a very slow 518-keV E3 transition to the ground state. In addition to this, a much weaker decay branch via a 413-keV M4 and a subsequent 105-keV E2 transition has been found. Thus we have found a new level at 105 keV with spin 4{sup +} between the isomeric and the ground state. The results are discussed in comparison to shell-model calculations.},
doi = {10.1103/PHYSREVC.84.014329},
journal = {Physical Review. C, Nuclear Physics},
issn = {0556-2813},
number = 1,
volume = 84,
place = {United States},
year = {2011},
month = {7}
}