Universität zu Köln

Hennig, A., Ahn, T., Anagnostatou, V., Blazhev, A., Cooper, N., Derya, V., Elvers, M., Endres, J., Goddard, P., Heinz, A., Hughes, R. O., Ilie, G., Mineva, M. N., Petkov, P., Pickstone, S. G., Pietralla, N., Radeck, D., Ross, T. J., Savran, D., Spieker, M., Werner, V. and Zilges, A. (2015). Collective excitations of Ru-96 by means of (p, p 'gamma) experiments. Phys. Rev. C, 92 (6). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1089-490X

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Abstract

Background: One-phonon mixed-symmetry quadrupole excitations are a well-known feature of near-spherical, vibrational nuclei. Their interpretation as a fundamental building block of vibrational structures is supported by the identification of multiphonon states resulting from a coupling of fully-symmetric and mixed-symmetric quadrupole phonons. In addition, the observation of strong M1 transitions between low-lying 3(-) and 4(+) states has been interpreted as an evidence for one-phonon mixed-symmetry excitations of octupole and hexadecapole character. Purpose: The aim of the present study is to identify collective one-and two-phonon excitations in the heaviest stable N = 52 isotone Ru-96 based on a measurement of absolute M1, E1, and E2 transition strengths. Methods: Inelastic proton-scattering experiments have been performed at the Wright Nuclear Structure Laboratory (WNSL), Yale University, and the Institute for Nuclear Physics (IKP), University of Cologne. From the acquired proton-gamma and gamma gamma coincidence data we deduced spins of excited states, gamma-decay branching ratios, and multipole mixing ratios, as well as lifetimes of excited states via the Doppler-shift attenuation method (DSAM). Results: Based on the new experimental data on absolute transition strengths, we identified the 2(+) and 3(+) members of the two-phonon mixed-symmetry quintuplet (2(1,ms)(+) circle times 2(1,s)(+)). Furthermore, we observed strong M1 transitions between low-lying 3(-) and 4(+) states suggesting one-phonon symmetric andmixed-symmetric octupole and hexadecapole components in their wave functions, respectively. The experimental results are compared to sdg-IBM-2 and shell-model calculations. Conclusions: Both the sdg-IBM-2 and the shell-model calculations are able to describe key features of mixed-symmetry excitations of Ru-96. Moreover, they support the one-phonon mixed-symmetry hexadecapole assignment of the experimental 4(2)(+) state.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Hennig, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ahn, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Anagnostatou, V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Blazhev, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Cooper, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Derya, V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Elvers, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Endres, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Goddard, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Heinz, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hughes, R. O. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ilie, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mineva, M. N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Petkov, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pickstone, S. G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pietralla, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Radeck, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ross, T. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Savran, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Spieker, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Werner, V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zilges, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-383606
DOI:	10.1103/PhysRevC.92.064317
Journal or Publication Title:	Phys. Rev. C
Volume:	92
Number:	6
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:	Keywords Language NEUTRON MIXED-SYMMETRY; INTERACTING BOSON MODEL; VIBRATIONAL NUCLEI; QUADRUPOLE PHONON; SPHERICAL NUCLEI; EXCITED-STATES; SHELL-MODEL; PROTON; MO-94; LIFETIMES Multiple languages Physics, Nuclear Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/38360