Siebeck, B., Seidlitz, M., Blazhev, A., Reiter, P., Altenkirch, R., Bauer, C., Butler, P. A., De Witte, H., Elseviers, J., Gaffney, L. P., Hess, H., Huyse, M., Kroell, T., Lutter, R., Pakarinen, J., Pietralla, N., Radeck, F., Scheck, M., Schneiders, D., Sotty, C., Van Duppen, P., Vermeulen, M., Voulot, D., Warr, N. and Wenander, F. (2015). Testing refined shell-model interactions in the sd shell: Coulomb excitation of Na-26. Phys. Rev. C, 91 (1). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1089-490X

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Abstract

Background: Shell-model calculations crucially depend on the residual interaction used to approximate the nucleon-nucleon interaction. Recent improvements to the empirical universal sd interaction (USD) describing nuclei within the sd shell yielded two new interactions-USDA and USDB-causing changes in the theoretical description of these nuclei. Purpose: Transition matrix elements between excited states provide an excellent probe to examine the underlying shell structure. These observables provide a stringent test for the newly derived interactions. The nucleus Na-26 with 7 valence neutrons and 3 valence protons outside the doubly-magic O-16 core is used as a test case. Method: A radioactive beam experiment with Na-26 (T-1/2 = 1,07s) was performed at the REX-ISOLDE facility (CERN) using Coulomb excitation at safe energies below the Coulomb barrier. Scattered particles were detected with an annular Si detector in coincidence with gamma rays observed by the segmented MINIBALL array. Coulomb excitation cross sections of the beam have been obtained by normalization to the well known Coulomb excitation cross sections of the Pd-104 target. Results: The observation of three gamma-ray transitions in Na-26 together with available spectroscopic data allows us to determine E2- and M1-transitional matrix elements. Results are compared to theoretical predictions. Conclusion: The improved theoretical description of Na-26 could be validated. Remaining discrepancies between experimental data and theoretical predictions indicate the need for future experiments and possibly further theoretical improvements.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Siebeck, B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Seidlitz, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Blazhev, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Reiter, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Altenkirch, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bauer, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Butler, P. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
De Witte, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Elseviers, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gaffney, L. P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hess, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Huyse, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kroell, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lutter, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pakarinen, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pietralla, N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Radeck, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Scheck, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schneiders, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sotty, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Van Duppen, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Vermeulen, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Voulot, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Warr, N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wenander, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-414662
DOI: 10.1103/PhysRevC.91.014311
Journal or Publication Title: Phys. Rev. C
Volume: 91
Number: 1
Date: 2015
Publisher: AMER PHYSICAL SOC
Place of Publication: COLLEGE PK
ISSN: 1089-490X
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
ENERGY-LEVELS; MINIBALL; DETECTOR; MOMENTSMultiple languages
Physics, NuclearMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/41466

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