Browsing by Author "A. Chakraborty"

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A study of measured neutron elastic differential neutron cross sections for 23Na
(Kluwer Academic Publishers, 2014) A. Kumar; M. Balasubramaniam; A. Chakraborty; B.P. Crider; S.F. Hicks; C. Karthikraj; L.J. Kersting; C.J. Luke; P.J. McDonough; M.T. McEllistrem; E.E. Peters; F.M. Prados-Estévez; A.J. Sigillito; M.M. Upadhyay; J.R. Vanhoy; S.W. Yates
Elastic neutron scattering angular distributions from 23Na have been measured for incident neutron energies between 1.0 and 4.0 MeV at the University of Kentucky Accelerator Laboratory using neutron time-of-flight techniques for the scattered neutrons. This is an energy region in which existing data are very sparse. Measurements are compared with the predictions of the light particle-induced reaction code TALYS. The calculations reproduce forward angle scattering but have difficulty with relative minima in the differential cross section and large-angle scattering. © Akadémiai Kiadó, Budapest, Hungary 2014.
Alignment effects in the medium-spin level structure of Se 78
(American Physical Society, 2022) K. Mandal; A. Chakraborty; A.K. Mondal; U.S. Ghosh; Aniruddha Dey; Saumyajit Biswas; B. Mukherjee; S. Rai; S. Chatterjee; S.K. Das; S. Samanta; R. Raut; S.S. Ghugre; S. Bhattacharyya; S. Nandi; S. Bhattacharya; G. Mukherjee; S. Ali; A. Goswami; S. Mukhopadhyay; Krishichayan; R. Banik; R. Chakrabarti; V. Kumar; A. Kumar
The excited states of Se78 were populated using the Ge76(α,2n) fusion evaporation reaction. The deexcited gamma rays were detected using the Indian National Gamma Array (INGA) spectrometer comprising clover and low-energy photon spectrometer (LEPS) detectors. The ground state band of Se78 has been extended up to Ex = 8.5 MeV and J = 16â ; this excitation regime is very close to the π(1g9/22) crossing frequency. Several newly observed in-band and intraband transitions belonging to the other bands of Se78 have also been placed in the level scheme based on their coincidence relationships. From the newly identified E1 transitions, an enhancement in the B(E1)/B(E2) values with spin has been observed which indicates the onset of octupole correlations in the band structure built on the 3-, 2508-keV state. Persistence of triaxial shape up to the highest observed spin of the ground state band has been observed and the feature of successive 1g9/22 quasiparticle alignments due to protons and neutrons has been unveiled. The consequences arising due to the occurrence of the neutron 1g9/2 quasiparticle alignments in the other observed correlated band structures are also presented. The results are interpreted in terms of total Routhian surface (TRS) calculations and the level structure systematic of the neighboring nuclei. © 2022 American Physical Society.
Effect of banana powder (Musa sapientum var. paradisiaca) on gastric mucosal shedding
(1987) K. Mukhopadhyaya; D. Bhattacharya; A. Chakraborty; R.K. Goel; A.K. Sanyal
Banana pulp powder (Musa sapientum Linn. var. paradisiaca) was studied for its effects on gastric mucosal resistance. Banana-treated (0.5 g/kg orally, twice daily for 3 days) rats of either sex showed: (i) a significant increase in the [3H]thymidine incorporation into mucosal cell DNA; (ii) a significant increase in the total carbohydrate (sum of total hexoses, hexosamine, fucose and sialic acid) content of gastric mucosa; (iii) a significant decrease in gastric juice DNA and protein; (iv) a significant increase in the total carbohydrates and carbohydrate/protein ratio of gastric juice. Aspirin treatment to rats caused similar effects as banana on the [3H]thymidine incorporation into mucosal cell DNA but showed opposite effects on the other parameters. These results suggest that banana treatment increased and aspirin decreased the gastric mucosal resistance as evidenced by a respective decrease and increase in gastric juice DNA, the latter serving as an index of the rate of mucosal shedding. Increased cellular mucus may be the factor for increased mucosal resistance. The results of the present study tend to confirm that plantain banana powder strengthens mucosal resistance and promotes the healing of ulcers. © 1987.
Emerging collectivity from the nuclear structure of Xe 132: Inelastic neutron scattering studies and shell-model calculations
(American Physical Society, 2019) E.E. Peters; A.E. Stuchbery; A. Chakraborty; B.P. Crider; S.F. Ashley; A. Kumar; M.T. McEllistrem; F.M. Prados-Estévez; S.W. Yates
Inelastic neutron scattering was used to study the low-lying nuclear structure of Xe132. A comprehensive level scheme is presented, as well as new level lifetimes, multipole mixing ratios, branching ratios, and transition probabilities. Comparisons of these data as well as previously measured E2 strengths and g factors are made with new shell-model calculations for Xe132,134,136 to explore the emergence of collectivity in the Xe isotopes with N<82 near the closed shell. © 2019 American Physical Society.
Evolution of collectivity and shape transition in Zn 66
(American Physical Society, 2020) S. Rai; U.S. Ghosh; B. Mukherjee; A. Biswas; A.K. Mondal; K. Mandal; A. Chakraborty; S. Chakraborty; G. Mukherjee; A. Sharma; I. Bala; S. Muralithar; R.P. Singh
Excited states in Zn66 were investigated through the in-beam ?-ray spectroscopic techniques using the Cr52(O18, 2p2n) fusion-evaporation reaction at a beam energy of 72.5 MeV. The ?-rays emitted by the de-exciting nuclei were recorded in coincidence mode using the 14 Compton suppressed Ge clover detectors of the Indian National Gamma Array. With 14 new transitions being identified, the level scheme of Zn66 has been extended up to the excitation energy ˜12.3MeV and spin ˜17?. A rotational band, associated with the two quasineutrons from the 1g9/2 orbital, has been found to exhibit a band crossing with the ground-state band at a spin of 6?. The evolution of the collectivity and shape transition in this nucleus have been discussed in the framework of the total Routhian surface calculations and in comparison with the neighboring Ge68,70 nuclei. © 2020 American Physical Society.
High spin states in 63Cu
(Springer New York LLC, 2018) S. Rai; B. Mukherjee; U.S. Ghosh; A. Biswas; A. Chakraborty; A.K. Mondal; S. Chakraborty; G. Mukherjee; I. Bala; S. Muralithar; R.P. Singh
High-spin states in 63Cu were investigated through in-beam γ-ray spectroscopic techniques using the 52Cr(18O,αp2n) fusion-evaporation reaction at a beam energy of 72.5 MeV. The γ-rays emitted by the excited nucleus were recorded in the coincidence mode using fourteen Compton suppressed Ge clover detectors of the Indian National Gamma-ray Array (INGA). Based on the γ-γ coincidence data, twenty-one new γ-ray transitions have been observed and placed --thereby extending the level scheme of 63Cu up to spin 25 / 2 ℏ and excitation energy ∼ 8. 36 MeV. Shell model calculations are performed in the f5 / 2pg9 / 2 model space with a 56Ni core using two effective interactions, viz. JUN45 and jj44b to interpret the observed excited states of this nucleus. A reasonable agreement is found between the experimental finding and the shell-model calculations --which implies that the excitations within the f5 / 2p3 / 2p1 / 2 orbitals are more dominant in defining the observed level structure than the excitation across the magic shell gap N= Z= 28. © 2018, SIF, Springer-Verlag GmbH Germany, part of Springer Nature.
High spin states in Pm139
(American Physical Society, 2009) A. Dhal; R.K. Sinha; L. Chaturvedi; P. Agarwal; S. Kumar; A.K. Jain; R. Kumar; I.M. Govil; S. Mukhopadhyay; A. Chakraborty; Krishichayan; S. Ray; S.S. Ghugre; A.K. Sinha; R. Kumar; R.P. Singh; S. Muralithar; R.K. Bhowmik; S.C. Pancholi; J.B. Gupta
The odd mass nucleus Pm139 has been studied to high spins through the Cd116(Al27,4n)Pm139 reaction at an incident beam energy of 120 MeV. The de-exciting γ-rays were detected using an array of 12 Compton suppressed Ge detectors. A total of 46 new levels have been proposed in the present work as a result of the observation of 60 new γ-rays. Four new bands including a ΔJ=1 sequence have been identified and all the earlier reported bands, other than the yrast band, have been extended to higher spins and excitation energy. The spin assignments for most of the newly reported levels have been made using the observed coincidence angular anisotropy. Tilted axis cranking calculations support the interpretation of two of the observed magnetic dipole sequences as examples of magnetic rotational bands. © 2009 The American Physical Society.
High-spin states in the odd-odd nucleus146Tb
(American Physical Society, 2004) Krishichayan; A. Chakraborty; S.S. Ghugre; R. Goswami; S. Mukhopadhyay; N.S. Pattabiraman; S. Ray; A.K. Sinha; S. Sarkar; P.V. Madhusudhana Rao; U. Garg; S.K. Basu; B.K. Yogi; L. Chaturvedi; A. Dhal; R.K. Sinha; M. Saha Sarkar; S. Saha; R. Singh; R.K. Bhowmik; A. Jhingan; N. Madhavan; S. Muralithar; S. Nath; R.P. Singh; P. Sugathan
The odd-odd 146Tb nucleus has been investigated using the 115In(34S,3n) reaction at 140 MeV incident energy using an array of eight Compton-suppressed Clover detectors. Based on the observed γ- γ coincidences, the level structure of 146Tb has been extended up to Ex∼ 10 MeV. Linear polarization measurements have been combined with angular correlations of the observed γ rays to assign the electromagnetic nature to the transitions. Probable origin of a cascade of M1 transitions observed around 8 MeV excitation energy has been discussed.
In-beam spectroscopic study of Zn 63
(American Physical Society, 2019) U.S. Ghosh; S. Rai; B. Mukherjee; A. Biswas; A.K. Mondal; K. Mandal; A. Chakraborty; S. Chakraborty; G. Mukherjee; A. Sharma; I. Bala; S. Muralithar; R.P. Singh
Investigation on the excited states of Zn63 was done through in-beam γ-ray spectroscopic techniques using the Cr52(O18,α3n) fusion-evaporation reaction at a beam energy of 72.5 MeV. Detection of the emitted γ rays from the excited nuclei was performed in the coincidence mode using 14 Compton suppressed Ge clover detectors of the Indian National Gamma Array. Based on the γ-γ coincidence data, 13 new transitions have been placed in the level scheme following their coincidence relationship and intensity balance. Spin and parity assignments of the excited levels have been carried out by extracting the directional correlation from oriented states ratio and polarization asymmetry values of the emitted γ rays. Shell model calculations have been performed in the f5/2pg9/2 model space with a Ni56 core using the jj44bpn interaction, to interpret the observed excited states of the nucleus. A reasonable agreement is found between the experimental findings and the shell-model calculations. In order to understand the evolution of a collective shape built on the 9/2+ (1704 keV) state, we have performed total Routhian surface calculations with a 1g9/2 quasineutron and found reasonable agreement. © 2019 American Physical Society.
Inelastic neutron scattering studies of Se 76
(American Physical Society, 2019) S. Mukhopadhyay; B.P. Crider; B.A. Brown; A. Chakraborty; A. Kumar; M.T. McEllistrem; E.E. Peters; F.M. Prados-Estévez; S.W. Yates
The low-lying, low-spin levels of Se76 were studied with the (n,n′γ) reaction. Gamma-ray excitation function measurements were performed at incident neutron energies from 2.0 to 3.5 MeV, and γ-ray angular distributions were measured at neutron energies of 2.4, 3.0, and 3.7 MeV. From these measurements, level spins, level lifetimes, branching ratios, and multipole mixing ratios were determined. We established the 02+ band, which supports the shape coexistence in Se76 predicted by large-scale shell model calculations and the interacting boson model. © 2019 American Physical Society.
Inference on fission timescale from neutron multiplicity measurement in 18O + 184W
(IOP Publishing Ltd, 2022) N.K. Rai; A. Gandhi; M T Senthil Kannan; S.K. Roy; N. Saneesh; M. Kumar; G. Kaur; D. Arora; K.S. Golda; A. Jhingan; P. Sugathan; T.K. Ghosh; Jhilam Sadhukhan; B.K. Nayak; Nabendu K Deb; Saumyajit Biswas; A. Chakraborty; A. Parihari; Ajay Kumar
The pre-scission and post-scission neutron multiplicities are measured for the 18O + 184W reaction in the excitation energy range of 67.23-76.37 MeV. Langevin dynamical calculations are performed to infer the energy dependence of fission decay time in compliance with the measured neutron multiplicities. Different models for nuclear dissipation are employed for this purpose. Fission process is usually expected to be faster at a higher beam energy. However, we found an enhancement in the average fission time as the incident beam energy increases. It happens because a higher excitation energy helps more neutrons to evaporate that eventually stabilizes the system against fission. The competition between fission and neutron evaporation delicately depends on the available excitation energy and it is explained here with the help of the partial fission yields contributed by the different isotopes of the primary compound nucleus. © 2022 IOP Publishing Ltd.
Investigation of different possible excitation modes in neutron-rich As 78
(American Physical Society, 2020) A.K. Mondal; A. Chakraborty; K. Mandal; U.S. Ghosh; Aniruddha Dey; Saumyajit Biswas; B. Mukherjee; S. Rai; Krishichayan; S. Chatterjee; S.K. Das; S. Samanta; R. Raut; S.S. Ghugre; S. Rajbanshi; R. Banik; S. Bhattacharyya; S. Nandi; S. Bhattacharya; G. Mukherjee; S. Ali; A. Goswami; R. Chakrabarti; S. Mukhopadhyay; A.K. Sinha; V. Kumar; A. Kumar
The yrast and nonyrast level structure of the odd-odd As78 nucleus has been investigated using the standard ? ray spectroscopic techniques. The excited states of As78 were populated through Ge76(a,pn) fusion evaporation reaction at the incident beam energies of 30, 35, and 40 MeV. The deexciting gamma rays were detected with the Indian National Gamma Array spectrometer composed of Clover and low-energy photon spectrometer detectors. In addition to the extension of the previously known yrast positive-parity band up to Ex ˜ 2.7 MeV with J=11?, an excited dipole band-like structure based on the 7(-), 1243-keV state has also newly been established. Several weak transitions feeding the low-lying nonyrast states have newly been identified and placed in the level scheme. A highly irregular sequence of levels has been observed at the low-excitation regime suggesting the dominance of single-particle excitations. The experimental results have been compared with the predicted results from the large-scale shell-model calculations. The calculated results indicate an enhanced contribution from the intruder p(1g9/2) orbital to the wave function of the positive-parity yrast excited states with J=7?. This enhanced contribution is supposed to provide subsequent mild collectivity for the concerned states. The nature of collectivity has been extracted from the total Routhian surface calculations. Evidences for the possible persistence of the stapler like mechanism prevailing in the positive- and negative-parity level sequences are presented. © 2020 American Physical Society.
Investigation of the low- and medium-spin level structure in As 77
(American Physical Society, 2023) A.K. Mondal; A. Chakraborty; K. Mandal; U.S. Ghosh; Aniruddha Dey; Saumyajit Biswas; B. Mukherjee; Krishichayan; S. Chatteerjee; S.K. Das; S. Samanta; R. Raut; S.S. Ghugre; S. Mukhopadhyay; S. Rajbanshi; R. Banik; S. Bhattacharyya; S. Nandi; S. Chakraborty; S. Bhattacharya; G. Mukherjee; S. Ali; A. Goswami; R. Chakrabarti; A. Kumar; R. Goswami
The low- and medium-spin level structure of As77 nucleus has been investigated using the Ge76(α,p2n) fusion evaporation reaction and the standard in-beam γ ray spectroscopic technique. The deexciting γ rays were detected with the Indian National Gamma Array spectrometer comprising Clover and LEPS detectors. The previously known 9/2+ yrast positive-parity band, based on the π(g9/2) configuration, has been extended to the excitation energy of Ex≈7.5 MeV with Jπ=(33/2+). An extension of the high-lying negative-parity band, based on the π[(g9/2)] - ν[(g9/2)(fp)] configuration, has been made up to Ex≈5.1 MeV, Jπ=(25/2-). The yrast positive-parity α=-1/2 signature partner band has newly been identified and the occurrence of large signature splitting associated with the partner bands have been observed. A quasi-γ vibrational band structure built on the nonyrast 13/2+ state has also newly been established. The experimental findings have been interpreted on the basis of the predicted results from the total Routhian surface, particle plus triaxial-rotor model, and shell-model calculations. The band crossing phenomena correlated to the ν(g9/2) alignment and the perseverance of triaxial shape up to the highest observed excitation regime of the 9/2+ yrast positive-parity band have been discussed. The evidence for the possible onset of the stapler-like mechanism prevailing in the high-lying negative-parity band structure are presented. © 2023 American Physical Society.
Level lifetimes and the structure of Xe 134 from inelastic neutron scattering
(American Physical Society, 2017) E.E. Peters; A. Chakraborty; B.P. Crider; S.F. Ashley; E. Elhami; S.F. Hicks; A. Kumar; M.T. McEllistrem; S. Mukhopadhyay; J.N. Orce; F.M. Prados-Estévez; S.W. Yates
The level structure of Xe134 was studied with the inelastic neutron scattering reaction followed by γ-ray detection. A number of level lifetimes were determined for the first time with the Doppler-shift attenuation method and the low-lying excited states were characterized. From this new spectroscopic information, the third excited state, a 0+ level which had only been observed in a previous inelastic neutron scattering study, was verified. Reduced transition probabilities were calculated; comparisons were drawn with a vibrational description of the nucleus and found lacking. The 3- octupole phonon has been confirmed, and the complete negative-parity multiplet resulting from the ν(1h11/22d3/2) configuration has also been tentatively identified for the first time in the N=80 isotones. © 2017 American Physical Society.
Lifetime measurements of microsecond isomers in the N=48 nuclei 88Zr and90Mo using recoil-isomer tagging
(American Physical Society, 2004) A. Chakraborty; Krishichayan; S.S. Ghugre; R. Goswami; S. Mukhopadhyay; N.S. Pattabiraman; S. Ray; A.K. Sinha; S. Sarkar; P.V. Madhusudhana Rao; U. Garg; S.K. Basu; L. Chaturvedi; A. Dhal; R.K. Sinha; I.M. Govil; M.B. Chatterjee; M. Saha Sarkar; R.K. Bhowmik; A. Jhingan; N. Madhavan; S. Muralithar; S. Nath; R.P. Singh; P. Sugathan
The recoil-isomer tagging technique has been used to study the isomeric states of nuclei in the vicinity of the N=50 shell closure. The nuclei of interest were separated from the projectilelike nuclei and other evaporation residues and transported to the focal plane of a recoil separator. The decay of the tagged isomer was studied at the focal plane using a high-purity Ge detector. The prompt transitions feeding the isomer were detected in an array of Clover Ge detectors placed around the target. The measured half-lives of the 8+ isomers in 88Zr and 90Mo are 1.41 (-0.09)(+0.12) μs and 1.17(-0.07) (+0.19), respectively. The corresponding transition probabilities are in reasonable agreement with the predictions of shell model calculations. The systematics of effective charges (ep and en) for N=48 nuclei are qualitatively understood in these calculations.
Measurement of neutron multiplicity to investigate the role of entrance channel parameters on the nuclear dissipation
(American Physical Society, 2019) N.K. Rai; A. Gandhi; Ajay Kumar; N. Saneesh; M. Kumar; G. Kaur; A. Parihari; D. Arora; K.S. Golda; A. Jhingan; P. Sugathan; T.K. Ghosh; Jhilam Sadhukhan; B.K. Nayak; Nabendu K. Deb; S. Biswas; A. Chakraborty
In the present work, the pre- and post-scission neutron multiplicities were measured for the reaction O18+W186 at different excitation energies populating the compound nucleus Pb204, using the National Array of Neutron Detectors (NAND) facility at IUAC, New Delhi, India. Here, we investigated the entrance channel effect on the nuclear dissipation involved in the heavy ion fusion-fission dynamics. The statistical model analysis was performed using the code vecstat. The prescribed reaction O18+W186 had similar value of the mass asymmetry as the system O16+Ta181 studied earlier, populating the compound nucleus Tl197. Specifically, we observed the similar behavior from both the systems against the nuclear dissipation, with the similar value of the mass asymmetry. The role of the entrance channel parameters on the nuclear dissipation was also discussed in the present work. © 2019 American Physical Society.
Modulation of gene activity in androgen-induced sex reversal in the garden lizard, calotes versicolor
(2010) A. Chakraborty; R. Raman
The Indian garden lizard, Calotes versicolor, an apparently non-chromosomal sex determination (CSD), non-temperature-dependent sex determination (TSD) species, represents a unique category of reptiles where male hormone-treated embryos emerge as males. The present paper traces the modulation of gene activity in the embryonic gonad following dihydrotestosterone (DHT) administration on day 8 of embryonic development. Expression of CvAR, CvWnt4, CvDmrt1 and CvSox9 genes has been studied in the mesonephros gonadal complex (MGC) 2 and 6 days after the treatment by RT-PCR and real-time qPCR. In the treated (30 μg/egg) embryos (sacrificed 48 h after treatment), CvAR was expressed in almost all the MGCs in contrast to its dimorphic expression in controls. CvWnt4, the autosomal ovary-specific gene, which has only basal level of expression in controls, was further down-regulated in the treated embryos. The dimorphic expression pattern of the male-specific CvSox9 and CvDmrt1 does not deviate from that seen in controls, suggesting that it acts upstream of CvAR. It appears that in C. versicolor, the primary sex determining switch for testis is essentially genetic (CvSox9 and CvDmrt1), but the genetic pathway of ovary differentiation, which is initiated later in development, is flexible enough to be modulated by hormones, as in other TSD and genetic sex determination (GSD) reptiles. One of the mechanisms of this flexibility, it appears, could be silencing of the ovary-inducing genes by the male hormones. Copyright © 2010 S. Karger AG, Basel.
Neutron scattering differential cross sections for 23Na from 1.5 to 4.5 MeV
(Elsevier, 2015) J.R. Vanhoy; S.F. Hicks; A. Chakraborty; B.R. Champine; B.M. Combs; B.P. Crider; L.J. Kersting; A. Kumar; C.J. Lueck; S.H. Liu; P.J. McDonough; M.T. McEllistrem; E.E. Peters; F.M. Prados-Estévez; L.C. Sidwell; A.J. Sigillito; D.W. Watts; S.W. Yates
Measurements of neutron elastic and inelastic scattering cross sections from 23Na have been performed for sixteen incident neutron energies between 1.5 and 4.5 MeV. These measurements were complemented by γ-ray excitation functions using the (n, n'γ) reaction to include excited levels not resolved in the neutron detection measurements. The time-of-flight (TOF) technique was employed for background reduction in both neutron and γ-ray measurements and for energy determination in neutron detection measurements. Previous reaction model evaluations relied primarily on neutron total cross sections and four (n, n0) and (n, n1) angular distributions in the 5 to 9 MeV range. The inclusion of more inelastic channels and measurements at lower incident neutron energies provide additional information on direct couplings between elastic and inelastic scattering as a function of angular momentum transfer. Reaction model calculations examining collective direct-coupling and compound absorption components were performed. © 2015 Elsevier B.V.
Quasielastic scattering measurements in the Si 28 + Nd 142,150 systems
(American Physical Society, 2020) Saumyajit Biswas; A. Chakraborty; A. Jhingan; D. Arora; B.R. Behera; Rohan Biswas; Nabendu Kumar Deb; S.S. Ghugre; Pankaj K. Giri; K.S. Golda; G. Kaur; A. Kumar; M. Kumar; B. Mukherjee; B.K. Nayak; A. Parihari; N.K. Rai; S. Rai; R. Raut; Rudra N. Sahoo; A.K. Sinha
Barrier distributions for the Si28+Nd142,150 systems were extracted from large-angle quasielastic scattering measurements. The measurements were carried out over a wide range of incident beam energies around the Coulomb barriers. The experimental results were compared with the predictions from coupled-channels calculations carried out using different coupling schemes. Reasonable agreement between the experimental and theoretical results was obtained. The role of coupling effects of the various excitation modes of the projectile and target on the observed barrier distributions is discussed. The sensitivity of the quasielastic scattering process on the mode of projectile excitation is clearly been seen from the use of two different types of targets, Nd142 and Nd150, having spherical and deformed shapes at the ground state, respectively. © 2020 American Physical Society.
Seniority structure of Xe82 136
(American Physical Society, 2018) E.E. Peters; P. Van Isacker; A. Chakraborty; B.P. Crider; A. Kumar; S.H. Liu; M.T. McEllistrem; C.V. Mehl; F.M. Prados-Estévez; T.J. Ross; J.L. Wood; S.W. Yates
The level structure of the N=82 nucleus Xe136 was studied with the inelastic neutron scattering reaction followed by γ-ray detection. A number of the spins and parities were reassigned, and many level lifetimes were determined for the first time using the Doppler-shift attenuation method. New shell-model calculations were also performed using both the full Z=50-82 model space, and a reduced model space including only the 1d5/2 and 0g7/2 orbitals. This new information characterizing Xe136 was used to identify the seniority structure of the low-lying levels and to assign (π0g7/2)υ=04, (π0g7/2)υ=24, (π0g7/2)υ=44, (π1d5/2)(π0g7/2)υ=13, and (π1d5/2)2(π0g7/2)υ=02 configurations to describe all observed states below 2.8 MeV. © 2018 American Physical Society.