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Watanabe, H.,Wang, H.K.,Lorusso, G.,Nishimura, S.,Xu, Z.Y.,Sumikama, T.,Sö,derströ,m, P.-A.,Doornenbal, P.,Browne, F.,Gey, G.,Jung, H.S.,Taprogge, J.,Vajta, Zs.,Wu, J.,Yagi, A.,Baba, H.,Benzon Elsevier 2019 Physics letters: B Vol.792 No.-
<P><B>Abstract</B></P> <P>The neutron-rich isotopes of palladium have attracted considerable interest in terms of the evolution of the N = 82 neutron shell closure and its influence on the <I>r</I>-process nucleosynthesis. In this Letter, we present the first spectroscopic information on the excited states in <SUP>125</SUP>Pd<SUB>79</SUB> and <SUP>127</SUP>Pd<SUB>81</SUB> studied using the EURICA <I>γ</I>-ray spectrometer, following production via in-flight fission of a high-intensity <SUP>238</SUP>U beam at the RIBF facility. New isomeric states with half-lives of 144(4) ns and 39(6) μs have been assigned spins and parities of ( 23 / <SUP> 2 + </SUP> ) and ( 19 / <SUP> 2 + </SUP> ) in <SUP>125</SUP>Pd and <SUP>127</SUP>Pd, respectively. The observed level properties are compared to a shell-model calculation, suggesting the competition between proton excitations and neutron excitations in the proton-hole and neutron-hole systems in the vicinity of the doubly magic nucleus <SUP>132</SUP>Sn.</P>
Observation of a γ-decaying millisecond isomeric state in <sup>128</sup>Cd<sub>80</sub>
Jungclaus, A.,Grawe, H.,Nishimura, S.,Doornenbal, P.,Lorusso, G.,Simpson, G.S.,Soderstrom, P.A.,Sumikama, T.,Taprogge, J.,Xu, Z.Y.,Baba, H.,Browne, F.,Fukuda, N.,Gernhauser, R.,Gey, G.,Inabe, N.,Isobe North-Holland Pub. Co 2017 Physics letters. Section B Vol.772 No.-
A new high-spin isomer in the neutron-rich nucleus <SUP>128</SUP>Cd was populated in the projectile fission of a <SUP>238</SUP>U beam at the Radioactive Isotope Beam Factory at RIKEN. A half-life of T<SUB>½</SUB>=6.3(8) ms was measured for the new state which was tentatively assigned a spin/parity of (15<SUP>-</SUP>). The experimental results are compared to shell model calculations performed using state-of-the-art realistic effective interactions and to the neighbouring nucleus <SUP>129</SUP>Cd. In the present experiment no evidence was found for the decay of a 18<SUP>+</SUP>E6 spin-trap isomer, based on the complete alignment of the two-neutron and two-proton holes in the 0h<SUB>1½</SUB> and the 0g<SUB>9/2</SUB> orbit, respectively, which is predicted to exist by the shell model.
Watanabe, H.,Lorusso, G.,Nishimura, S.,Otsuka, T.,Ogawa, K.,Xu, Z. Y.,Sumikama, T.,Sö,derströ,m, P.-A.,Doornenbal, P.,Li, Z.,Browne, F.,Gey, G.,Jung, H. S.,Taprogge, J.,Vajta, Zs.,Wu, J.,Yagi, American Physical Society 2014 Physical Review Letters Vol.113 No.4
<P>A new isomer with a half-life of 23.0(8) ms has been identified at 2406 keV in (126)Pd and is proposed to have a spin and parity of 10(+) with a maximally aligned configuration comprising two neutron holes in the 1h(11/2) orbit. In addition to an internal-decay branch through a hindered electric octupole transition, β decay from the long-lived isomer was observed to populate excited states at high spins in (126)Ag. The smaller energy difference between the 10(+) and 7(-) isomers in (126)Pd than in the heavier N=80 isotones can be interpreted as being ascribed to the monopole shift of the 1h(11/2) neutron orbit. The effects of the monopole interaction on the evolution of single-neutron energies below (132)Sn are discussed in terms of the central and tensor forces.</P>
Two-hole structure outsideNi78: Existence of aμsisomer ofCo76andβdecay intoNi76
Sö,derströ,m, P.-A.,Nishimura, S.,Xu, Z. Y.,Sieja, K.,Werner, V.,Doornenbal, P.,Lorusso, G.,Browne, F.,Gey, G.,Jung, H. S.,Sumikama, T.,Taprogge, J.,Vajta, Zs.,Watanabe, H.,Wu, J.,Baba, H.,Dom American Physical Society 2015 PHYSICAL REVIEW C - Vol.92 No.5
Proton-hole and core-excited states in the semi-magic nucleus 131In82
Taprogge, J.,Jungclaus, A.,Grawe, H.,Borzov, I. N.,Nishimura, S.,Doornenbal, P.,Lorusso, G.,Simpson, G. S.,Sö,derströ,m, P. -A.,Sumikama, T.,Xu, Z. Y.,Baba, H.,Browne, F.,Fukuda, N.,Gernhä Springer-Verlag 2016 The european physical journal. A, Hadrons and nucl Vol.52 No.11
<P>The decay of the N = 83 nucleus Cd-131 has been studied at the RIBF facility at the RIKEN Nishina Center. The main purpose of the study was to identify the position of the and proton-hole states and the energies of core-excited configurations in the semi-magic nucleus In-131. From the radiation emitted following the decay, a level scheme of In-131 was established and the feeding to each excited state determined. Similarities between the single-particle transitions observed in the decays of the N = 83 isotones In-132 and Cd-131 are discussed. Finally the excitation energies of several core-excited configurations in In-131 are compared to QRPA and shell-model calculations.</P>
β-delayedγ-ray spectroscopy of non-yrast states inTe138near the neutron drip line
Lee, P.,Moon, C.-B.,Lee, C. S.,Odahara, A.,Lozeva, R.,Yagi, A.,Nishimura, S.,Doornenbal, P.,Lorusso, G.,Sö,derströ,m, P.-A.,Sumikama, T.,Watanabe, H.,Isobe, T.,Baba, H.,Sakurai, H.,Browne, F. American Physical Society 2015 PHYSICAL REVIEW C - Vol.92 No.4
Jungclaus, A.,Gargano, A.,Grawe, H.,Taprogge, J.,Nishimura, S.,Doornenbal, P.,Lorusso, G.,Shimizu, Y.,Simpson, G. S.,Sö,derströ,m, P.-A.,Sumikama, T.,Xu, Z. Y.,Baba, H.,Browne, F.,Fukuda, N.,G American Physical Society 2016 Physical Review C Vol.93 No.4
<P>For the first time, the gamma decay of excited states has been observed in a nucleus situated in the quadrant south-east of doubly magic Sn-132, a region in which experimental information so far is limited to ground-state properties. Six gamma rays with energies of 50, 86, 103, 227, 357, and 602 keV were observed following the beta-delayed neutron emission from Cd-133(85), populated in the projectile fission of a U-238 beam at the Radioactive Isotope Beam Factory at RIKEN within the EURICA project. The new experimental information is compared to the results of a modern realistic shell-model calculation, the first one in this region very far from stability, focusing in particular on the pi 0g(9/2)(-1) circle times nu 1f(7/2) particle-hole multiplet in In-132(83). In addition, theoretical estimates based on a scaling of the two-body matrix elements for the pi h(11/2)(-1) circle times nu g(9/2) analog multiplet in Tl-208(127), one major proton and one major neutron shell above, are presented.</P>
βdecay of semi-magicCd130: Revision and extension of the level scheme ofIn130
Jungclaus, A.,Grawe, H.,Nishimura, S.,Doornenbal, P.,Lorusso, G.,Simpson, G. S.,Sö,derströ,m, P.-A.,Sumikama, T.,Taprogge, J.,Xu, Z. Y.,Baba, H.,Browne, F.,Fukuda, N.,Gernhä,user, R.,Gey, American Physical Society 2016 Physical Review C Vol.94 No.2
<P>The beta decay of the semi-magic nucleus Cd-130 has been studied at the RIBF facility at the RIKEN Nishina Center. The high statistics of the present experiment allowed for a revision of the established level scheme of In-130 and the observation of additional beta feeding to high- lying core-excited states in In-130. The experimental results are compared to shell-model calculations employing a model space consisting of the full major N = 50-82 neutron and Z = 28-50 proton shells and the NA-14 interaction, and good agreement is found.</P>
New decay scheme of theSb8551136<sup>6−</sup>isomer
Lozeva, R.,Odahara, A.,Moon, C.-B.,Nishimura, S.,Doornenbal, P.,Naï,dja, H.,Nowacki, F.,Sö,derströ,m, P.-A.,Sumikama, T.,Lorusso, G.,Wu, J.,Xu, Z. Y.,Baba, H.,Browne, F.,Daido, R.,Daugas, American Physical Society 2015 PHYSICAL REVIEW C - Vol.92 No.2
Taprogge, J.,Jungclaus, A.,Grawe, H.,Nishimura, S.,Xu, Z.Y.,Doornenbal, P.,Lorusso, G.,Ná,cher, E.,Simpson, G.S.,Sö,derströ,m, P.-A.,Sumikama, T.,Baba, H.,Browne, F.,Fukuda, N.,Gernh&aum North-Holland Pub. Co 2014 Physics letters. Section B Vol.738 No.-
<P><B>Abstract</B></P> <P>The decay of an isomeric state in the neutron-rich nucleus <SUP>129</SUP>Cd has been observed via the detection of internal conversion and Compton electrons providing first experimental information on excited states in this nucleus. The isomer was populated in the projectile fission of a <SUP>238</SUP>U beam at the Radioactive Isotope Beam Factory at RIKEN. From the measured yields of <I>γ</I>-rays and internal conversion electrons, a multipolarity of <I>E</I>3 was tentatively assigned to the isomeric transition. A half-life of <SUB> T 1 / 2 </SUB> = 3.6 ( 2 ) ms was determined for the new state which was assigned a spin of ( 21 / <SUP> 2 + </SUP> ) , based on a comparison to shell model calculations performed using state-of-the-art realistic effective interactions.</P>