Universität zu Köln

Ries, P. C., Pai, H., Beck, T., Beller, J., Bhike, M., Derya, V, Gayer, U., Isaak, J., Loeher, B., Mertes, L., Pietralla, N., Romig, C., Savran, D., Schilling, M., Tornow, W., Typel, S., Werner, V, Wilhelmy, J., Zilges, A. and Zweidinger, M. (2019). Valence-shell dependence of the pygmy dipole resonance: E1 strength difference in Cr-50,Cr-54. Phys. Rev. C, 100 (2). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9993

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Abstract

Background: The low-lying electric dipole strength provides insights into the parameters of the nuclear equation of state via its connection with the pygmy dipole resonance and nuclear neutron skin thickness. Purpose: The aim was to complement the systematic of the pygmy dipole resonance and first study its behavior across the N = 28 neutron shell closure. Methods: Photon-scattering cross sections of states of Cr-50,Cr-54 were measured up to an excitation energy of 9.7 MeV via the nuclear resonance fluorescence method using gamma-ray beams from bremsstrahlung and Compton backscattering. Results: Transitions strengths, spin and parity quantum number, and average branching ratios for 55 excited states, 44 of which were observed for the first time, were determined. The comparison between the total observed strengths of the isotopes Cr-50,Cr-52,Cr-54 shows a significant increase above the shell closure. Conclusions: The evolution of the pygmy dipole resonance is heavily influenced by the shell structure.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Ries, P. C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pai, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Beck, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Beller, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bhike, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Derya, V UNSPECIFIED UNSPECIFIED UNSPECIFIED Gayer, U. UNSPECIFIED UNSPECIFIED UNSPECIFIED Isaak, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Loeher, B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mertes, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pietralla, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Romig, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Savran, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schilling, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Tornow, W. UNSPECIFIED UNSPECIFIED UNSPECIFIED Typel, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Werner, V UNSPECIFIED UNSPECIFIED UNSPECIFIED Wilhelmy, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zilges, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zweidinger, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-144821
DOI:	10.1103/PhysRevC.100.021301
Journal or Publication Title:	Phys. Rev. C
Volume:	100
Number:	2
Date:	2019
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2469-9993
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language EQUATION; EXCITATIONS; NUCLEI; STATES; RADII Multiple languages Physics, Nuclear Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/14482