Abstract:A b s t r a c t : N u c l e a r s p e c t r o s c o p i c i n f o r m a t i o n f o r e x p e r i m e n t a l l y i n v e s t i g a t e d n u c l i d e s o f m a s s 1 4 1 ( T e , I , X e , C s , Ba, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, and Ho) has been evaluated. A summary of information obtained in various reaction and decay experiments is presented, together with data tables and adopted level schemes. Cutoff Date: Literature available up to Jan 1, 2012 has been consulted. General Policies and Organizatio… Show more
“…Data for 133−143 La correspond to refs. [35][36][37][38][39][40]. In 133,145 La the transition corresponds to 3/2 + → 5/2 + , in 137−143 La to 5/2 + → 7/2 + , and in 135 La, where the transition corresponds to 7/2 + (g 7/2 ) → 5/2 + (d 5/2 ), the F w has been modified by the 6 8 factor corresponding to (2I f +1)/(2I i +1).…”
Low-spin excited states in 145 La have been investigated from the 145 Ba β − decay. The 145 Ba nuclei were directly produced by photofission in the ALTO facility or obtained from the β − decay of 145 Cs also produced by photofission. A new level scheme is proposed including 67 excited levels up to 3 MeV and 164 transitions. Half-lives in the few ns range were measured for the first excited states. Configurations for levels up to ≈ 600 keV are proposed.
“…Data for 133−143 La correspond to refs. [35][36][37][38][39][40]. In 133,145 La the transition corresponds to 3/2 + → 5/2 + , in 137−143 La to 5/2 + → 7/2 + , and in 135 La, where the transition corresponds to 7/2 + (g 7/2 ) → 5/2 + (d 5/2 ), the F w has been modified by the 6 8 factor corresponding to (2I f +1)/(2I i +1).…”
Low-spin excited states in 145 La have been investigated from the 145 Ba β − decay. The 145 Ba nuclei were directly produced by photofission in the ALTO facility or obtained from the β − decay of 145 Cs also produced by photofission. A new level scheme is proposed including 67 excited levels up to 3 MeV and 164 transitions. Half-lives in the few ns range were measured for the first excited states. Configurations for levels up to ≈ 600 keV are proposed.
“…The principal γ-ray energies, intensities, and appropriate branching ratios (if necessary) used in this study (Table 2) were acquired from the Nuclear Data Sheets (Artna-Cohen, 1997; Browne, 2001;Burrows, 2001;Sonzogni, 2001;Browne, 2005;Basunia, 2007;Kumar Jain et al, 2007;Nica, 2007;Browne and Tuli, 2011;Singh et al, 2011;Browne and Tuli, 2012;Nica, 2014).…”
Actinium-225 and Bi have been used successfully in targeted alpha therapy (TAT) in preclinical and clinical research. This paper is a continuation of research activities aiming to expand the availability ofAc. The high-energy proton spallation reaction on natural thorium metal targets has been utilized to produce millicurie quantities of Ac. The results of sixteen irradiation experiments of thorium metal at beam energies between 78 and 192MeV are summarized in this work. Irradiations have been conducted at Brookhaven National Laboratory (BNL) and Los Alamos National Laboratory (LANL), while target dissolution and processing was carried out at Oak Ridge National Laboratory (ORNL). Excitation functions for actinium and thorium isotopes, as well as for some of the fission products, are presented. The cross sections for production ofAc range from 3.6 to 16.7mb in the incident proton energy range of 78-192MeV. Based on these data, production of curie quantities of Ac is possible by irradiating a 5.0gcmTh target for 10 days in either BNL or LANL proton irradiation facilities.
“…The latter de-excites via a single 145-keV γ ray to the ground state whose absolute emission probability is well established, I abs γ (145γ)=48.29(20) % [17]. [Note that in the most recent evaluation by Nica [18] it is incorrectly given as 48.4(3)% .] Using Eqn.…”
Section: A Energy and Efficiency Calibrationsmentioning
Absolute γ-ray emission probabilities in the β − decay of 67 Cu were measured by means of γ-ray and β − -decay singles and β − − γ coincidences. The new results, together with the known decay scheme of 67 Cu, were used to determine absolute β − -decay branching intensities. The present data differ significantly from previously published values. In addition, the half-life of the I π =1/2 − isomer in 67 Zn was measured as T 1/2 =9.37(4) µs, in a good agreement with earlier measurements. From the analysis of the Fermi-Kurie plots, Q β − (g.s.)=560.3(10) keV was deduced, which differs from the previously measured value of 577(8) keV, but it is in a good agreement with Q β − (g.s.)=561.3(15) keV recommended in the latest Atomic Mass Evaluation.
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