%0 Journal Article %1 ISI:000445056800001 %A Wilhelmy, J. %A Brown, A. %A Erbacher, P. %A Gayer, U. %A Isaak, J. %A Krishichayan, %A Loeher, B. %A Muescher, M. %A Pai, H. %A Pietralla, N. %A Ries, P. %A Savran, D. %A Scholz, P. %A Spieker, M. %A Tornow, W. %A Werner, V %A Zilges, A. %D 2018 %J Phys. Rev. C %K imported myown zilges %N 3 %R 10.1103/PhysRevC.98.034315 %T Investigation of J=1 states and their gamma-decay behavior in Cr-52 %V 98 %X 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.

@article{ISI:000445056800001, 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.}, added-at = {2019-11-20T10:09:48.000+0100}, article-number = {034315}, author = {Wilhelmy, J. and Brown, A. and Erbacher, P. and Gayer, U. and Isaak, J. and Krishichayan and Loeher, B. and Muescher, M. and Pai, H. and Pietralla, N. and Ries, P. and Savran, D. and Scholz, P. and Spieker, M. and Tornow, W. and Werner, V and Zilges, A.}, biburl = {https://www.bibsonomy.org/bibtex/2f929855c329da7dbc85fe2360d51b23e/ikpcologne}, doi = {10.1103/PhysRevC.98.034315}, eissn = {2469-9993}, interhash = {c14ba050961e3cef295552097058e40d}, intrahash = {f929855c329da7dbc85fe2360d51b23e}, issn = {2469-9985}, journal = {Phys. Rev. C}, keywords = {imported myown zilges}, month = {SEP 19}, number = 3, orcid-numbers = {Werner, Volker/0000-0003-4001-0150 Friman-Gayer, Udo/0000-0003-2590-5052}, researcherid-numbers = {Werner, Volker/C-1181-2017}, timestamp = {2019-11-20T10:09:48.000+0100}, title = {Investigation of J=1 states and their gamma-decay behavior in Cr-52}, unique-id = {ISI:000445056800001}, volume = 98, year = 2018 }