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

doi:10.1063/1.2187841

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 proceeding › Conference contribution › peer-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 language	English
Title of host publication	CAPTURE GAMMA-RAY SPECTROSCOPY AND RELATED TOPICS
Subtitle of host publication	12th International Symposium
Pages	96-100
Number of pages	5
DOIs	https://doi.org/10.1063/1.2187841
State	Published - Mar 13 2006
Event	12th International Symposium on Capture Gamma-Ray Spectroscopy and Related Topics - Notre Dame, IN, United States Duration: Sep 4 2005 → Sep 9 2005

Publication series

Name	AIP Conference Proceedings
Volume	819
ISSN (Print)	0094-243X
ISSN (Electronic)	1551-7616

Conference

Conference	12th International Symposium on Capture Gamma-Ray Spectroscopy and Related Topics
Country/Territory	United States
City	Notre Dame, IN
Period	9/4/05 → 9/9/05

Keywords

Charge independence
Isoscalar matrix elements
Shell model
Transition strengths

ASJC Scopus subject areas

Physics and Astronomy (all)

Access to Document

10.1063/1.2187841

Cite this

Orce, J. N., Petkov, P., Velázquez, V., Mckay, C. J., Lesher, S. R., Choudry, S., Mynk, M., Linnemann, A., Jolie, J., Von Brentano, P., Werner, V., Yates, S. W., & Mcellistrem, M. T. (2006). Symmetry of isoscalar matrix elements and systematics in the sd and beginning of fp shells. In CAPTURE GAMMA-RAY SPECTROSCOPY AND RELATED TOPICS: 12th International Symposium (pp. 96-100). (AIP Conference Proceedings; Vol. 819). https://doi.org/10.1063/1.2187841

@inproceedings{782c71bc3f7345dd9e72d4499caf7dc1,

title = "Symmetry of isoscalar matrix elements and systematics in the sd and beginning of fp shells",

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.",

keywords = "Charge independence, Isoscalar matrix elements, Shell model, Transition strengths",

author = "Orce, {J. N.} and P. Petkov and V. Vel{\'a}zquez and Mckay, {C. J.} and Lesher, {S. R.} and S. Choudry and M. Mynk and A. Linnemann and J. Jolie and {Von Brentano}, P. and V. Werner and Yates, {S. W.} and Mcellistrem, {M. T.}",

year = "2006",

month = mar,

day = "13",

doi = "10.1063/1.2187841",

language = "English",

isbn = "0735403139",

series = "AIP Conference Proceedings",

pages = "96--100",

booktitle = "CAPTURE GAMMA-RAY SPECTROSCOPY AND RELATED TOPICS",

note = "12th International Symposium on Capture Gamma-Ray Spectroscopy and Related Topics ; Conference date: 04-09-2005 Through 09-09-2005",

}

Orce, JN, Petkov, P, Velázquez, V, Mckay, CJ, Lesher, SR, Choudry, S, Mynk, M, Linnemann, A, Jolie, J, Von Brentano, P, Werner, V, Yates, SW & Mcellistrem, MT 2006, Symmetry of isoscalar matrix elements and systematics in the sd and beginning of fp shells. in CAPTURE GAMMA-RAY SPECTROSCOPY AND RELATED TOPICS: 12th International Symposium. AIP Conference Proceedings, vol. 819, pp. 96-100, 12th International Symposium on Capture Gamma-Ray Spectroscopy and Related Topics, Notre Dame, IN, United States, 9/4/05. https://doi.org/10.1063/1.2187841

Symmetry of isoscalar matrix elements and systematics in the sd and beginning of fp shells. / Orce, J. N.; Petkov, P.; Velázquez, V. et al.
CAPTURE GAMMA-RAY SPECTROSCOPY AND RELATED TOPICS: 12th International Symposium. 2006. p. 96-100 (AIP Conference Proceedings; Vol. 819).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

TY - GEN

T1 - Symmetry of isoscalar matrix elements and systematics in the sd and beginning of fp shells

AU - Orce, J. N.

AU - Petkov, P.

AU - Velázquez, V.

AU - Mckay, C. J.

AU - Lesher, S. R.

AU - Choudry, S.

AU - Mynk, M.

AU - Linnemann, A.

AU - Jolie, J.

AU - Von Brentano, P.

AU - Werner, V.

AU - Yates, S. W.

AU - Mcellistrem, M. T.

PY - 2006/3/13

Y1 - 2006/3/13

N2 - 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.

AB - 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.

KW - Charge independence

KW - Isoscalar matrix elements

KW - Shell model

KW - Transition strengths

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T3 - AIP Conference Proceedings

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BT - CAPTURE GAMMA-RAY SPECTROSCOPY AND RELATED TOPICS

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ER -

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

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Keywords

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