Derya, V., Tsoneva, N., Aumann, T., Bhike, M., Endres, J., Gooden, M., Hennig, A., Isaak, J., Lenske, H., Loeher, B., Pietralla, N., Savran, D., Tornow, W., Werner, V. and Zilges, A. (2016). Decay of quadrupole-octupole 1(-) states in Ca-40 and Ce-140. Phys. Rev. C, 93 (3). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1089-490X

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Abstract

Background: Two-phonon excitations originating from the coupling of two collective one-phonon states are of great interest in nuclear structure physics. One possibility to generate low-lying E1 excitations is the coupling of quadrupole and octupole phonons. Purpose: In this work, the gamma-decay behavior of candidates for the (2(1)(+) circle times 3(1))(1)-state in the doubly magic nucleus Ca-40 and in the heavier and semimagic nucleus Ce-140 is investigated. Methods: ((gamma) over bar,gamma') experiments have been carried out at the High Intensity gamma-ray Source (HI gamma S) facility in combination with the high-efficiency gamma-ray spectroscopy setup gamma(3) consisting of HPGe and LaBr3 detectors. The setup enables the acquisition of gamma-gamma coincidence data and, hence, the detection of direct decay paths. Results: In addition to the known ground-state decays, for Ca-40 the decay into the 3(1) state was observed, while for Ce-140 the direct decays into the 2(1)(+) and the 0(2)(+) state were detected. The experimentally deduced transition strengths and excitation energies are compared to theoretical calculations in the framework of EDF theory plus QPM approach and systematically analyzed for N = 82 isotones. In addition, negative parities for two J = 1 states in Ca-44 were deduced simultaneously. Conclusions: The experimental findings together with the theoretical calculations support the two-phonon character of the 1(1)(-) excitation in the light-to-medium-mass nucleus Ca-40 as well as in the stable even-even N = 82 nuclei.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Derya, V.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Tsoneva, N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Aumann, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bhike, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Endres, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gooden, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hennig, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Isaak, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lenske, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Loeher, B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pietralla, N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Savran, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Tornow, W.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Werner, V.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Zilges, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-281596
DOI: 10.1103/PhysRevC.93.034311
Journal or Publication Title: Phys. Rev. C
Volume: 93
Number: 3
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
DIPOLE STRENGTH; ELECTRON-SCATTERING; 2-PHONON CHARACTER; NEUTRON-SKIN; NUCLEI; ENERGY; RESONANCE; EXCITATION; ND-142; LIFETIMESMultiple languages
Physics, NuclearMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/28159

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