Pai, H., Beck, T., Beller, J., Beyer, R., Bhike, M., Derya, V., Gayer, U., Isaak, J., Kvasil, J., Loeher, B., Nesterenko, V. O., Pietralla, N., Martinez-Pinedo, G., Mertes, L., Ponomarev, V. Yu, Reinhard, P. -G., Repko, A., Ries, P. C., Romig, C., Savran, D., Schwengner, R., Tornow, W., Werner, V., Wilhelmy, J., Zilges, A. and Zweidinger, M. (2016). Magnetic dipole excitations of Cr-50. Phys. Rev. C, 93 (1). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1089-490X

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Abstract

The low-lying M1 strength of the open-shell nucleus Cr-50 has been studied with the method of nuclear resonance fluorescence up to 9.7 MeV using bremsstrahlung at the superconducting Darmstadt linear electron accelerator S-DALINAC and Compton backscattered photons at the High Intensity gamma-ray Source (HI gamma S) facility between 6 and 9.7 MeV of the initial photon energy. Fifteen 1(+) states have been observed between 3.6 and 9.7 MeV. Following our analysis the lowest 1(+) state at 3.6 MeV can be considered as an isovector orbital mode with some spin admixture. The obtained results generally match the estimations and trends typical for the scissors-like mode. Detailed calculations within the Skyrme quasiparticle random-phase-approximation method and the large-scale shell model justify our conclusions. The calculated distributions of the orbital current for the lowest 1(+)-state suggest the schematic view of Lipparini and Stringari (isovector rotation-like oscillations inside the rigid surface) rather than the scissors-like picture of Lo Iudice and Palumbo. The spin M1 resonance is shown to be mainly generated by spin-flip transitions between the orbitals of the fp shell.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Pai, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Beck, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Beller, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Beyer, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bhike, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Derya, V.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gayer, U.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Isaak, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kvasil, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Loeher, B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Nesterenko, V. O.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pietralla, N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Martinez-Pinedo, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mertes, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ponomarev, V. YuUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Reinhard, P. -G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Repko, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ries, P. C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Romig, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Savran, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schwengner, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Tornow, W.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Werner, V.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wilhelmy, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Zilges, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Zweidinger, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-287032
DOI: 10.1103/PhysRevC.93.014318
Journal or Publication Title: Phys. Rev. C
Volume: 93
Number: 1
Date: 2016
Publisher: AMER PHYSICAL SOC
Place of Publication: COLLEGE PK
ISSN: 1089-490X
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
SHELL-MODEL; NUCLEAR-DEFORMATION; COLLECTIVE MODES; MIXED-SYMMETRY; SCISSORS MODE; SPIN-FLIP; STATES; ENERGYMultiple languages
Physics, NuclearMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/28703

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