Symmetry of isoscalar matrix elements and systematics in the sd and beginning of fp shells

J. N. Orce, P. Petkov, V. Velázquez, C. J. Mckay, S. R. Lesher, S. Choudry, M. Mynk, A. Linnemann, J. Jolie, P. Von Brentano, V. Werner, S. W. Yates, M. T. Mcellistrem

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

A careful determination of the lifetime and measurement of the branching ratio for decay of the first 2 T=1 + state in 42Sc has allowed an accurate experimental test of charge independence in the A = 42 isobaric triplet. A lifetime of 69(17) fs was measured at the University of Kentucky, while relative intensities for the 975 keV and 1586 keV transitions depopulating the first 2 T=1 + state have been determined at the University of Cologne as 100(1) and 8(1), respectively. Both measurements give an isoscalar matrix element, M 0, of 6.4(9) (W.u.) 1/2. This result confirms charge independence for the A=42 isobaric triplet. Shell model calculations have been carried out for understanding the global trend of M 0 values for A = 4n + 2 isobaric triplets ranging from A = 18 to A = 42. The 2 1(T=1) +→0 1(T=1) + transition energies, reduced transition probabilities and M 0 values are reproduced to a high degree of accuracy. The trend of M 0 strength along the sd shell is interpreted in terms of the shell structure. Certain discrepancies arise at the extremes of the sd shell, for the A = 18 and A = 38 isobaric triplets, which might be explained in terms of the low valence space at the extremes of the sd shell.

Original languageEnglish
Title of host publicationCAPTURE GAMMA-RAY SPECTROSCOPY AND RELATED TOPICS
Subtitle of host publication12th International Symposium
Pages96-100
Number of pages5
DOIs
StatePublished - Mar 13 2006
Event12th International Symposium on Capture Gamma-Ray Spectroscopy and Related Topics - Notre Dame, IN, United States
Duration: Sep 4 2005Sep 9 2005

Publication series

NameAIP Conference Proceedings
Volume819
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference12th International Symposium on Capture Gamma-Ray Spectroscopy and Related Topics
Country/TerritoryUnited States
CityNotre Dame, IN
Period9/4/059/9/05

Keywords

  • Charge independence
  • Isoscalar matrix elements
  • Shell model
  • Transition strengths

ASJC Scopus subject areas

  • Physics and Astronomy (all)

Fingerprint

Dive into the research topics of 'Symmetry of isoscalar matrix elements and systematics in the sd and beginning of fp shells'. Together they form a unique fingerprint.

Cite this