Universität zu Köln

Wilhelmy, J., Brown, A., Erbacher, P., Gayer, U., Isaak, J., Loeher, B., Muescher, M., Pai, H., Pietralla, N., Ries, P., Savran, D., Scholz, P., Spieker, M., Tornow, W., Werner, V and Zilges, A. (2018). Investigation of J=1 states and their gamma-decay behavior in Cr-52. Phys. Rev. C, 98 (3). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9993

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Abstract

Background: In the A approximate to 50 mass region M1 spin-flip transitions are prominent around 9 MeV. An accumulation of 1(-) states between 5 and 8 MeV generating additional E1 strength, also denoted as pygmy dipole resonance, has been established in many nuclei with neutron excess within the last decade. Purpose: The gamma-decay behavior of J = 1 states has been investigated in an NRF experiment. M1 excitations have been compared to shell model calculations. Methods: J = 1 states were excited by quasi-monoenergetic, linearly polarized gamma-ray beams generated by laser-Compton backscattering at the HI gamma S facility, Durham, NC, USA. Depopulating gamma rays were detected with the multidetector array gamma(3). Results: For eleven beam-energy settings the gamma-decay behavior of dipole states was analyzed by a state-to-state analysis and average gamma-decay branching ratios have been investigated. 34 parity quantum numbers were assigned to J = 1 states. Conclusions: Six 1(-) states and two 1(+) states have been investigated in NRF experiments for the first time. The M1 strength distribution is in good agreement with shell-model calculations.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Wilhelmy, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Brown, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Erbacher, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gayer, U. UNSPECIFIED UNSPECIFIED UNSPECIFIED Isaak, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Loeher, B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Muescher, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pai, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pietralla, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ries, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Savran, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Scholz, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Spieker, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Tornow, W. UNSPECIFIED UNSPECIFIED UNSPECIFIED Werner, V UNSPECIFIED UNSPECIFIED UNSPECIFIED Zilges, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-172647
DOI:	10.1103/PhysRevC.98.034315
Journal or Publication Title:	Phys. Rev. C
Volume:	98
Number:	3
Date:	2018
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 SHELL-MODEL; DIPOLE; SCATTERING; RESONANCE; STRENGTH; NUCLEI; TRANSITION; ENERGY Multiple languages Physics, Nuclear Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/17264