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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.,Zhang, G.X.,Yoshida, K.,Walker, P.M.,Liu, J.J.,Wu, J.,Regan, P.H.,Soderstrom, P.A.,Kanaoka, H.,Korkulu, Z.,Lee, P.S.,Nishimura, S.,Yagi, A.,Ahn, D.S.,Alharbi, T.,Baba, H.,Browne, F.,Bruce North-Holland Pub. Co 2016 Physics letters. Section B Vol.760 No.-
The level structure of <SUP>172</SUP>Dy has been investigated for the first time by means of decay spectroscopy following in-flight fission of a <SUP>238</SUP>U beam. A long-lived isomeric state with T<SUB>½</SUB>=0.71(5) s and K<SUP>π</SUP>=8<SUP>-</SUP> has been identified at 1278 keV, which decays to the ground-state and γ-vibrational bands through hindered electromagnetic transitions, as well as to the daughter nucleus <SUP>172</SUP>Ho via allowed β decays. The robust nature of the K<SUP>π</SUP>=8<SUP>-</SUP> isomer and the ground-state rotational band reveals an axially-symmetric structure for this nucleus. Meanwhile, the γ-vibrational levels have been identified at unusually low excitation energy compared to the neighboring well-deformed nuclei, indicating the significance of the microscopic effect on the non-axial collectivity in this doubly mid-shell region. The underlying mechanism of enhanced γ vibration is discussed in comparison with the deformed Quasiparticle Random-Phase Approximation based on a Skyrme energy-density functional.
RADIATION SAFETY STUDIES AT TOHOKU UNIVERSITY CYRIC
Yamadera, M. Baba A.,Miura, T.,Aoki, T.,Hagiwara, M.,Kawata, N. 대한방사선 방어학회 2001 방사선방어학회지 Vol.26 No.3
A brief introduction is presented on the radiation safety studies at Tohoku University Cyclotron & Radioisotope Center. Studios on two subject are described; (1) measurement of the thick target neutron yield and radioisotope production / activation cross section for ten's of MeV neutrons and ions using K=110 Tohoku University cyclotron to provide basicdata fur accelerator shielding, and (2) development of techniques for high sensitive radiation detection and profile measurement using an Imaging Plate which is a high sensitive two-dimensional radiation sensor. Application of the Imaging Plate techniques to localization of very weak radioactivity and to neutron profile measurement is described.
T. Sanami,M. Hagiwara,H. Iwase,M. Takada,D. Satoh,Y. Iwamoto,S. Kunieda,H. Yashima,A. Tamii,M. Baba 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
The experimental program to measure double differential cross section (DDX) data for fragment production is launched to establish reaction models and parameters for proton induced reaction on light-medium nuclei for the energy range from threshold to a few hundred MeV. In this program, a Bragg Curve Counter (BCC) that is improved to cover entire energy range of fragment is employed as a detector. DDXs of lithium, beryllium, boron and carbon emission at 30, 60, 90, and 135 degree were measured for 40, 50, 70, and 80 MeV proton on carbon, nitrogen, oxygen and aluminium Theoretical calculation results using three different intra-nuclear cascade models were compared with experimental data. By choosing appropriate model, the calculation generally reproduces the DDXs except for fragments having relatively high energy and small emission angle, and fragments from two body reaction.
Haji Baba, A.S.,Azillah, A.,Mukherjee, T.K.,Abdullah, R.B. Asian Australasian Association of Animal Productio 1998 Animal Bioscience Vol.11 No.5
The effects of supplementation with mixed fodder or concentrate were investigated on the performance of a) growth of male lambs and kids grazing extensively under oil palm trees and b) reproduction of ewes and goats stall-fed with native herbage. Supplemented kids and lambs had higher average daily weight gain than controls but the effect was only significant for those which received concentrate (p < 0.05). Final body weight was only significantly different from controls for lambs supplemented with concentrate (p < 0.05). The ages at puberty, first mating, first conception and first kidding of supplemented goats were about 110 days earlier than those for controls (p < 0.05 or better). Supplemented goats had first mating and conceived at lower body weights (p < 0.01) than those in control groups. Different feeding regimes had no effects (p > 0.05) on the reproductive performance of ewes apart from highest body weight of first lambing in animals supplemented with concentrate (p < 0.05). Native herbage available under oil palm trees of 5 years old was sufficient for growth and reproduction of sheep and goats. Concentrate was better than mixed fodder as supplement for enhancing the reproductive performance of goats but both appeared to have limited effects on the performance of reproduction in ewes and growth in male kids.