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.
%0 Journal Article
%1 ISI:000371741100001
%A Derya, V.
%A Tsoneva, N.
%A Aumann, T.
%A Bhike, M.
%A Endres, J.
%A Gooden, M.
%A Hennig, A.
%A Isaak, J.
%A Lenske, H.
%A Loeher, B.
%A Pietralla, N.
%A Savran, D.
%A Tornow, W.
%A Werner, V.
%A Zilges, A.
%D 2016
%J Phys. Rev. C
%K imported myown zilges
%N 3
%R 10.1103/PhysRevC.93.034311
%T Decay of quadrupole-octupole 1(-) states in Ca-40 and Ce-140
%V 93
%X 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.
@article{ISI:000371741100001,
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.},
added-at = {2019-11-20T10:09:48.000+0100},
article-number = {034311},
author = {Derya, V. and Tsoneva, N. and Aumann, T. and Bhike, M. and Endres, J. and Gooden, M. and Hennig, A. and Isaak, J. and Lenske, H. and Loeher, B. and Pietralla, N. and Savran, D. and Tornow, W. and Werner, V. and Zilges, A.},
biburl = {https://www.bibsonomy.org/bibtex/2109e48a41f995ec78ba392a8fd294d33/ikpcologne},
doi = {10.1103/PhysRevC.93.034311},
eissn = {2469-9993},
interhash = {15976c0f59ae7118c7c44ec1bd64dd49},
intrahash = {109e48a41f995ec78ba392a8fd294d33},
issn = {2469-9985},
journal = {Phys. Rev. C},
keywords = {imported myown zilges},
month = {MAR 10},
number = 3,
orcid-numbers = {Werner, Volker/0000-0003-4001-0150
Pietralla, Norbert/0000-0002-4797-3032},
researcherid-numbers = {Werner, Volker/C-1181-2017
Aumann, Thomas/B-1455-2012
Pietralla, Norbert/L-8465-2017},
timestamp = {2019-11-20T10:09:48.000+0100},
title = {Decay of quadrupole-octupole 1(-) states in Ca-40 and Ce-140},
unique-id = {ISI:000371741100001},
volume = 93,
year = 2016
}