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Title: Coulomb shifts and shape changes in the mass 70 region

Abstract

The technique of recoil {beta} tagging has been developed which allows prompt {gamma} decays in nuclei from excited states to be correlated with electrons from their subsequent short-lived {beta} decay. This technique is ideal for studying nuclei very far from stability and improves in sensitivity for very short-lived decays and for high decay Q-values. The method has allowed excited states in {sup 78}Y to be observed for the first time, as well as an extension in the knowledge of T=1 states in {sup 74}Rb. From this new information it has been possible to compare Coulomb energy differences (CED) between T=1 states in {sup 70}Br/{sup 70}Se, {sup 74}Rb/{sup 74}Kr, and {sup 78}Y/{sup 78}Sr. The A=70 CED exhibit an anomalous behavior which is inconsistent with all other known CED. This behavior may be accounted for qualitatively in terms of small variations in the Coulomb energy arising from shape changes.

Authors:
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  1. Department of Physics, University of York, Heslington, York YO10 5DD (United Kingdom)
Publication Date:
OSTI Identifier:
21003442
Resource Type:
Journal Article
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 75; Journal Issue: 6; Other Information: DOI: 10.1103/PhysRevC.75.061301; (c) 2007 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; BETA DECAY; BROMINE 70; COMPARATIVE EVALUATIONS; COULOMB ENERGY; ELECTRONS; EXCITED STATES; GAMMA DECAY; KRYPTON 74; MASS; RUBIDIUM 74; S STATES; SELENIUM 70; SHAPE; STRONTIUM 78; YTTRIUM 78

Citation Formats

Nara Singh, B S, Steer, A N, Jenkins, D G, Wadsworth, R, Bentley, M A, Davies, P J, Glover, R, Pattabiraman, N S, Lister, C J, Grahn, T, Greenlees, P T, Jones, P, Julin, R, Juutinen, S, Leino, M, Nyman, M, Pakarinen, J, Rahkila, P, Saren, J, Scholey, C, Physics Division, Argonne National Laboratory, 9700 South Cass Ave., Argonne, Illinois 60439, Department of Physics, University of Jyvaeskylae, P.O. Box 35, FIN-40351 Jyvaeskylae, Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, and Royal Institute of Technology, Roslagstullsbacken 21, S-106 91 Stockholm. Coulomb shifts and shape changes in the mass 70 region. United States: N. p., 2007. Web. doi:10.1103/PHYSREVC.75.061301.
Nara Singh, B S, Steer, A N, Jenkins, D G, Wadsworth, R, Bentley, M A, Davies, P J, Glover, R, Pattabiraman, N S, Lister, C J, Grahn, T, Greenlees, P T, Jones, P, Julin, R, Juutinen, S, Leino, M, Nyman, M, Pakarinen, J, Rahkila, P, Saren, J, Scholey, C, Physics Division, Argonne National Laboratory, 9700 South Cass Ave., Argonne, Illinois 60439, Department of Physics, University of Jyvaeskylae, P.O. Box 35, FIN-40351 Jyvaeskylae, Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, & Royal Institute of Technology, Roslagstullsbacken 21, S-106 91 Stockholm. Coulomb shifts and shape changes in the mass 70 region. United States. https://doi.org/10.1103/PHYSREVC.75.061301
Nara Singh, B S, Steer, A N, Jenkins, D G, Wadsworth, R, Bentley, M A, Davies, P J, Glover, R, Pattabiraman, N S, Lister, C J, Grahn, T, Greenlees, P T, Jones, P, Julin, R, Juutinen, S, Leino, M, Nyman, M, Pakarinen, J, Rahkila, P, Saren, J, Scholey, C, Physics Division, Argonne National Laboratory, 9700 South Cass Ave., Argonne, Illinois 60439, Department of Physics, University of Jyvaeskylae, P.O. Box 35, FIN-40351 Jyvaeskylae, Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, and Royal Institute of Technology, Roslagstullsbacken 21, S-106 91 Stockholm. 2007. "Coulomb shifts and shape changes in the mass 70 region". United States. https://doi.org/10.1103/PHYSREVC.75.061301.
@article{osti_21003442,
title = {Coulomb shifts and shape changes in the mass 70 region},
author = {Nara Singh, B S and Steer, A N and Jenkins, D G and Wadsworth, R and Bentley, M A and Davies, P J and Glover, R and Pattabiraman, N S and Lister, C J and Grahn, T and Greenlees, P T and Jones, P and Julin, R and Juutinen, S and Leino, M and Nyman, M and Pakarinen, J and Rahkila, P and Saren, J and Scholey, C and Physics Division, Argonne National Laboratory, 9700 South Cass Ave., Argonne, Illinois 60439 and Department of Physics, University of Jyvaeskylae, P.O. Box 35, FIN-40351 Jyvaeskylae and Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE and Royal Institute of Technology, Roslagstullsbacken 21, S-106 91 Stockholm},
abstractNote = {The technique of recoil {beta} tagging has been developed which allows prompt {gamma} decays in nuclei from excited states to be correlated with electrons from their subsequent short-lived {beta} decay. This technique is ideal for studying nuclei very far from stability and improves in sensitivity for very short-lived decays and for high decay Q-values. The method has allowed excited states in {sup 78}Y to be observed for the first time, as well as an extension in the knowledge of T=1 states in {sup 74}Rb. From this new information it has been possible to compare Coulomb energy differences (CED) between T=1 states in {sup 70}Br/{sup 70}Se, {sup 74}Rb/{sup 74}Kr, and {sup 78}Y/{sup 78}Sr. The A=70 CED exhibit an anomalous behavior which is inconsistent with all other known CED. This behavior may be accounted for qualitatively in terms of small variations in the Coulomb energy arising from shape changes.},
doi = {10.1103/PHYSREVC.75.061301},
url = {https://www.osti.gov/biblio/21003442}, journal = {Physical Review. C, Nuclear Physics},
issn = {0556-2813},
number = 6,
volume = 75,
place = {United States},
year = {Fri Jun 15 00:00:00 EDT 2007},
month = {Fri Jun 15 00:00:00 EDT 2007}
}