001119375 001__ 1119375
001119375 003__ SzGeCERN
001119375 005__ 20240508070453.0
001119375 0247_ $$2DOI$$a10.1016/j.nuclphysa.2008.08.005
001119375 0248_ $$aoai:cds.cern.ch:1119375$$pcerncds:FULLTEXT$$pcerncds:CERN:FULLTEXT$$pcerncds:CERN
001119375 035__ $$9arXiv$$aoai:arXiv.org:0808.0790
001119375 035__ $$9SPIRES$$a7859899
001119375 035__ $$9Inspire$$a792509
001119375 037__ $$9arXiv$$aarXiv:0808.0790$$cnucl-ex
001119375 041__ $$aeng
001119375 100__ $$aBoutami, R.$$uMadrid, Inst. Estructura Materia
001119375 245__ $$aNuclear structure of $^{231}$Ac
001119375 260__ $$c2008
001119375 269__ $$c07 Aug 2008
001119375 300__ $$a47 p
001119375 520__ $$aThe low-energy structure of 231Ac has been investigated by means of gamma ray spectroscopy following the beta-decay of 231Ra. Multipolarities of 28 transitions have been established by measuring conversion electrons with a mini-orange electron spectrometer. The decay scheme of 231Ra --> 231Ac has been constructed for the first time. The Advanced Time Delayed beta-gamma-gamma(t) method has been used to measure the half-lives of five levels. The moderately fast B(E1) transition rates derived suggest that the octupole effects, albeit weak, are still present in this exotic nucleus.
001119375 520__ $$9Elsevier$$aThe low-energy structure of 231 Ac has been investigated by means of γ ray spectroscopy following the β − decay of 231 Ra. Multipolarities of 28 transitions have been established by measuring conversion electrons with a mini-orange electron spectrometer. The decay scheme of 231 Ra → 231 Ac has been constructed for the first time. The Advanced Time Delayed β γ γ ( t ) method has been used to measure the half-lives of five levels. The moderately fast B (E1) transition rates derived suggest that the octupole effects, albeit weak, are still present in this exotic nucleus.
001119375 520__ $$9arXiv$$aThe low-energy structure of 231Ac has been investigated by means of gamma ray spectroscopy following the beta-decay of 231Ra. Multipolarities of 28 transitions have been established by measuring conversion electrons with a mini-orange electron spectrometer. The decay scheme of 231Ra --> 231Ac has been constructed for the first time. The Advanced Time Delayed beta-gamma-gamma(t) method has been used to measure the half-lives of five levels. The moderately fast B(E1) transition rates derived suggest that the octupole effects, albeit weak, are still present in this exotic nucleus.
001119375 542__ $$fElsevier B.V.
001119375 595__ $$aLANL EDS
001119375 65017 $$2SzGeCERN$$aNuclear Physics - Experiment
001119375 690C_ $$aARTICLE
001119375 690C_ $$aCERN
001119375 693__ $$aXX$$eXX
001119375 695__ $$9LANL EDS$$aNuclear Experiment
001119375 695__ $$9LANL EDS$$anucl-ex
001119375 700__ $$aBorge, M.J.G.$$uMadrid, Inst. Estructura Materia
001119375 700__ $$aMach, H.$$uUppsala U.
001119375 700__ $$aKurcewicz, W.$$uWarsaw U.
001119375 700__ $$aFraile, L.M.$$uMadrid U.$$uCERN
001119375 700__ $$aGulda, K.$$uWarsaw U.
001119375 700__ $$aAas, A.J.$$uOslo U.
001119375 700__ $$aGarcia-Raffi, L.M.$$uValencia U., IFIC
001119375 700__ $$aLovhoiden, G.$$uOslo U.
001119375 700__ $$aMartinez, T.$$uValencia U., IFIC
001119375 700__ $$aRubio, B.$$uValencia U., IFIC
001119375 700__ $$aTain, J.L.$$uValencia U., IFIC
001119375 700__ $$aTengblad, O.$$uMadrid, Inst. Estructura Materia$$uCERN
001119375 710__ $$5PH-EP
001119375 773__ $$c244-275$$pNucl. Phys. A$$v811$$y2008
001119375 8564_ $$uhttp://arxiv.org/pdf/0808.0790.pdf$$yPreprint
001119375 8564_ $$82437816$$s656262$$uhttp://cds.cern.ch/record/1119375/files/arXiv:0808.0790.pdf
001119375 8564_ $$82437804$$s15734$$uhttp://cds.cern.ch/record/1119375/files/fig-5a.png$$y00009 Partial level scheme of \nuc{231}Ac. Levels up to 460 keVexcitation energy. Strong coincidences are indicated by dots.
001119375 8564_ $$82437805$$s9492$$uhttp://cds.cern.ch/record/1119375/files/fig-4d.png$$y00008 (a) and (c) BaF$_2$ energy spectra sorted from the triple coincidence $\beta$-Ge-BaF$_2$ events. The Ge-energy gates were set on (a) the 299.10 keV and (c) the 205.0 keV transitions. \newline (b) and (d) Decay time curves due to the lifetimes of the 116.02 and 266.76 keV levels, respectively. These spectra were obtained by selecting in the BaF$_2$ detector the 54.29 keV $\gamma$ transition (marked by a black rectangle in panel (a)) and the 200 keV region (marked in panel (c)).Panel (d) shows the experimental points, the prompt curve and the slope curve fitted in the deconvolution method.
001119375 8564_ $$82437806$$s19303$$uhttp://cds.cern.ch/record/1119375/files/fig-5c.png$$y00011 Partial level scheme of \nuc{231}Ac.The upper part of the level scheme is shown. Strong coincidences are indicated by dots.
001119375 8564_ $$82437807$$s6894$$uhttp://cds.cern.ch/record/1119375/files/fig-4a.png$$y00005 (a) and (c) BaF$_2$ energy spectra sorted from the triple coincidence $\beta$-Ge-BaF$_2$ events. The Ge-energy gates were set on (a) the 299.10 keV and (c) the 205.0 keV transitions. \newline (b) and (d) Decay time curves due to the lifetimes of the 116.02 and 266.76 keV levels, respectively. These spectra were obtained by selecting in the BaF$_2$ detector the 54.29 keV $\gamma$ transition (marked by a black rectangle in panel (a)) and the 200 keV region (marked in panel (c)).Panel (d) shows the experimental points, the prompt curve and the slope curve fitted in the deconvolution method.
001119375 8564_ $$82437808$$s17717$$uhttp://cds.cern.ch/record/1119375/files/fig-5b.png$$y00010 Partial level scheme of \nuc{231}Ac. Levels up to 681 keV excitation energyare shown. Strong coincidences are indicated by dots.
001119375 8564_ $$82437809$$s7614$$uhttp://cds.cern.ch/record/1119375/files/fig-4c.png$$y00007 (a) and (c) BaF$_2$ energy spectra sorted from the triple coincidence $\beta$-Ge-BaF$_2$ events. The Ge-energy gates were set on (a) the 299.10 keV and (c) the 205.0 keV transitions. \newline (b) and (d) Decay time curves due to the lifetimes of the 116.02 and 266.76 keV levels, respectively. These spectra were obtained by selecting in the BaF$_2$ detector the 54.29 keV $\gamma$ transition (marked by a black rectangle in panel (a)) and the 200 keV region (marked in panel (c)).Panel (d) shows the experimental points, the prompt curve and the slope curve fitted in the deconvolution method.
001119375 8564_ $$82437810$$s6102$$uhttp://cds.cern.ch/record/1119375/files/fig-4b.png$$y00006 (a) and (c) BaF$_2$ energy spectra sorted from the triple coincidence $\beta$-Ge-BaF$_2$ events. The Ge-energy gates were set on (a) the 299.10 keV and (c) the 205.0 keV transitions. \newline (b) and (d) Decay time curves due to the lifetimes of the 116.02 and 266.76 keV levels, respectively. These spectra were obtained by selecting in the BaF$_2$ detector the 54.29 keV $\gamma$ transition (marked by a black rectangle in panel (a)) and the 200 keV region (marked in panel (c)).Panel (d) shows the experimental points, the prompt curve and the slope curve fitted in the deconvolution method.
001119375 8564_ $$82437811$$s1981$$uhttp://cds.cern.ch/record/1119375/files/fig-1b.png$$y00001 Low-energy part of the gamma spectrum recorded in the planar Ge detector at the \emph{conversion electron station.} The spectrum was taken during 4 hours and 52 minutes in the second experiment with a collection and measuring time of 200 s. The lines marked with an asterisk belong to the decay chain of the \nuc{212}Ra\nuc{19}Fcontaminant.
001119375 8564_ $$82437812$$s22449$$uhttp://cds.cern.ch/record/1119375/files/fig-1a.png$$y00000 Low-energy part of the gamma spectrum recorded in the planar Ge detector at the \emph{conversion electron station.} The spectrum was taken during 4 hours and 52 minutes in the second experiment with a collection and measuring time of 200 s. The lines marked with an asterisk belong to the decay chain of the \nuc{212}Ra\nuc{19}Fcontaminant.
001119375 8564_ $$82437813$$s18359$$uhttp://cds.cern.ch/record/1119375/files/fig-6b.png$$y00013 Excitation energy systematics for the 1/2[400], 1/2[530], 3/2[651], 3/2[402], 5/2[523], 5/2[642] bands in the neutron rich Ac and Pa isotopes around N=142. The lowest state of the 3/2[651] band in $^{231}$Pa is the 5/2$^+$ level at 86.48 keV, 8.18 keVbelow the 3/2$^+$. Data are taken from~\cite{bur03,bandas-nucleos}.
001119375 8564_ $$82437814$$s21275$$uhttp://cds.cern.ch/record/1119375/files/fig-6a.png$$y00012 Excitation energy systematics for the 1/2[400], 1/2[530], 3/2[651], 3/2[402], 5/2[523], 5/2[642] bands in the neutron rich Ac and Pa isotopes around N=142. The lowest state of the 3/2[651] band in $^{231}$Pa is the 5/2$^+$ level at 86.48 keV, 8.18 keVbelow the 3/2$^+$. Data are taken from~\cite{bur03,bandas-nucleos}.
001119375 8564_ $$82437815$$s23576$$uhttp://cds.cern.ch/record/1119375/files/fig-2b.png$$y00003 Compton-subtracted projection spectra gated on the 54.29 keV $\gamma$ line. In the upper part, the summed gamma coincidence spectrum gated on the HPGe detectors from the \emph{fast timing station} is shown. In the bottom part, the electron-$\gamma $ coincidence spectrum gated on the planar detector from the \emph{conversion electron station} is displayed. The electron peaks are labelled with the energy values of their corresponding $\gamma$ transitions. The K, L$_{I,II}$, $\Sigma$M and $\Sigma $N electron binding energies in Ac are 106.76, 19.57, 4.47 and 1.07 keV, respectively.
001119375 8564_ $$82437817$$s24238$$uhttp://cds.cern.ch/record/1119375/files/fig-2a.png$$y00002 Compton-subtracted projection spectra gated on the 54.29 keV $\gamma$ line. In the upper part, the summed gamma coincidence spectrum gated on the HPGe detectors from the \emph{fast timing station} is shown. In the bottom part, the electron-$\gamma $ coincidence spectrum gated on the planar detector from the \emph{conversion electron station} is displayed. The electron peaks are labelled with the energy values of their corresponding $\gamma$ transitions. The K, L$_{I,II}$, $\Sigma$M and $\Sigma $N electron binding energies in Ac are 106.76, 19.57, 4.47 and 1.07 keV, respectively.
001119375 8564_ $$82437818$$s31637$$uhttp://cds.cern.ch/record/1119375/files/fig-3.png$$y00004 Conversion electron spectrum taken with the long cycle of 200 s. The electron peaks are labelled with the energy values of their corresponding $\gamma$ transitions. The K, L$_{I,II}$, $\Sigma$M and $\Sigma $N electron binding energies in Ac are 106.76, 19.57, 4.47 and 1.07 keV, respectively.
001119375 8564_ $$82437819$$s20215$$uhttp://cds.cern.ch/record/1119375/files/fig-7.png$$y00014 Tentative assignment of the low energy experimental levelsin $^{231}$Ac into rotational bands, see text. The levels in green were originally established in reference \cite{tho77}.
001119375 916__ $$sn$$w200831$$ya2008
001119375 960__ $$a13
001119375 961__ $$c20100608$$h1158$$lCER01$$x20080807
001119375 963__ $$aPUBLIC
001119375 970__ $$a002771697CER
001119375 980__ $$aARTICLE