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NoLopez-Martens, A.*; Henning, G.*; Khoo, T. L.*; Seweryniak, D.*; Alcorta, M.*; Asai, Masato; Back, B. B.*; Bertone, P. F.*; Boilley, D.*; Carpenter, M. P.*; et al.
EPJ Web of Conferences, 131, p.03001_1 - 03001_6, 2016/12
Times Cited Count：1 Percentile：40.85(Chemistry, Inorganic & Nuclear)Fission barrier height and its angular-momentum dependence have been measured for the first time in the nucleus with the atomic number greater than 100. The entry distribution method, which can determine the excitation energy at which fission starts to dominate the decay process, was applied to No. The fission barrier of No was found to be 6.6 MeV at zero spin, indicating that the No is strongly stabilized by the nuclear shell effects.
= 8
two-quasineutron isomer in 
PuHota, S.*; Tandel, S.*; Chowdhury, P.*; Ahmad, I.*; Carpenter, M. P.*; Chiara, C. J.*; Greene, J. P.*; Hoffman, C. R.*; Jackson, E. G.*; Janssens, R. V. F.*; et al.
Physical Review C, 94(2), p.021303_1 - 021303_5, 2016/08
Times Cited Count：9 Percentile：55.90(Physics, Nuclear)The decay of a = 8 isomer in Pu and the collective band structure populating the isomer are studied using deep inelastic excitations with 
Ti and 
Pb beams, respectively. Precise measurements of 
branching ratios in the band confirm a clean 9/2
[734]
7/2
[624] for the isomer, validating the systematics of K
= 8 two-quasineutron isomers observed in even-
, 
= 150 isotones. These isomers around the deformed shell gap at = 152 provide critical benchmarks for theoretical predictions of single-particle energies in this gateway region to superheavy nuclei.
Shahat, A.*; Awual, M. R.; Khaleque, M. A.*; Alam, M. Z.*; Naushad, M.*; Chowdhury, A. M. S*
Chemical Engineering Journal, 273, p.286 - 295, 2015/08
Times Cited Count：356 Percentile：99.59(Engineering, Environmental)No and 
ThHenning, G.*; Khoo, T. L.*; Lopez-Martens, A.*; Seweryniak, D.*; Alcorta, M.*; Asai, Masato; Back, B. B.*; Bertone, P. F.*; Boilley, D.*; Carpenter, M. P.*; et al.
Physical Review Letters, 113(26), p.262505_1 - 262505_6, 2014/12
Times Cited Count：34 Percentile：81.14(Physics, Multidisciplinary)Fission barrier heights of a shell-stabilized superheavy nucleus No have been determined as a function of spin up to 19
through the measured distribution of entry points of 
deexcitations in the excitation energy vs. spin plane. The fission barrier height of No was determined to be 6.0 MeV at spin 15, and 6.6 MeV at spin 0 by extrapolation. This demonstrates that the shell effect actually enlarges the fission barrier in such heavy nuclei and keeps the barrier high even at high spin.
NoHenning, G.*; Lopez-Martens, A.*; Khoo, T. L.*; Seweryniak, D.*; Alcorta, M.*; Asai, Masato; Back, B. B.*; Bertone, P. F.*; Boilley, D.*; Carpenter, M. P.*; et al.
EPJ Web of Conferences, 66, p.02046_1 - 02046_8, 2014/03
Times Cited Count：3 Percentile：67.67(Physics, Nuclear)Fission barrier heights of No have been determined through the entry distribution method. The entry distribution is the initial distribution of excitation energy and spin from which the deexcitation starts in the fusion-evaporation reaction. The initial distribution is extracted from measured -ray multiplicity and total -ray energy. This paper describes the details of the entry distribution method, and reports the first determination of the fission barrier heights of No, which is the heaviest nucleus whose fission barrier has been measured.
Awual, M. R.; Khaleque, M. A.*; Ferdows, M.*; Chowdhury, A. M. S*; Yaita, Tsuyoshi
Microchemical Journal, 110, p.591 - 598, 2013/09
Times Cited Count：153 Percentile：98.57(Chemistry, Analytical)
isomer in 
RfRobinson, A. P.*; Khoo, T. L.*; Seweryniak, D.*; Ahmad, I.*; Asai, Masato; Back, B. B.*; Carpenter, M. P.*; Chowdhury, P.*; Davids, C. N.*; Greene, J.*; et al.
Physical Review C, 83(6), p.064311_1 - 064311_7, 2011/06
Times Cited Count：35 Percentile：86.14(Physics, Nuclear)We have identified an isomer with a half-life of 17 
s in Rf through a calorimetric conversion electron measurement tagged with implanted Rf nuclei using the fragment mass analyzer at Argonne National Laboratory. The low population yield for this isomer suggests that this isomer should not be a 2-quasiparticle high- isomer which is typically observed in the N = 152 isotones, but should be a 4-quasiparticle one. Possible reasons of the non-observation of a 2-quasiparticle isomer are this isomer decays by fission with a half-life similar to that of the ground state of Rf. Another possibility, that there is no 2-quasiparticle isomer at all, would imply an abrupt termination of axially symmetric deformed shape at Z=104.
Villard, L.*; Bottino, A.*; Brunner, S.*; Casati, A.*; Chowdhury, J.*; Dannert, T.*; Ganesh, R.*; Garbet, X.*; G
rler, T.*; Grandgirard, V.*; et al.
Plasma Physics and Controlled Fusion, 52(12), p.124038_1 - 124038_18, 2010/11
Times Cited Count：22 Percentile：60.89(Physics, Fluids & Plasmas)Seweryniak, D.*; Khoo, T. L.*; Ahmad, I.*; Kondev, F. G.*; Robinson, A.*; Tandel, S. K.*; Asai, Masato; Back, B. B.*; Carpenter, M. P.*; Chowdhury, P.*; et al.
Nuclear Physics A, 834(1-4), p.357c - 361c, 2010/03
Times Cited Count：9 Percentile：55.14(Physics, Nuclear)Experimental data on single-particle energies in nuclei around Z=100 and N=152 play an important role to test validity of theoretical predictions for shell structure of superheavy nuclei. We found high-K two-quasiparticle isomers in 
No and No, and evaluated energies of proton single-particle orbitals around Z=100. We also found a new high-K three quasiparticle isomer in 
Rf. Energies of neutron single-particle orbitals were also evaluated from experimental data of the 
decay of Rf. Comparisons between the present experimental data and various theoretical calculations for the proton single-particle orbitals indicate that the calculation by using the Woods-Saxon potential gives the best agreement with the data.
catalystHakoda, Teruyuki; Chowdhury, M. A. Z.*; Shimada, Akihiko; Hirota, Koichi
Plasma Chemistry and Plasma Processing, 29(6), p.549 - 557, 2009/12
Times Cited Count：7 Percentile：28.84(Engineering, Chemical)The decomposition of dimethyl sulfide (DMS) at initial concentrations of 4.5-18.0 ppmv in air was studied under electron-beam (EB) irradiation. Doses to decompose 90% of input DMS were 2.5 kGy for 4.5 ppmv, 3.4 kGy for 10.6 ppmv, and 3.9 kGy for 18.0 ppmv. HCOOH, (CH
)SO, and trace CHOH and (CH)SO were produced as irradiation products in addition to CO and CO. Application of an O decomposition catalyst to an irradiated sample gas led to an enhancement in the oxidation of DMS and its products into CO and the decomposition of O. For 10.6 ppmv DMS/air, the mineralization ratio increased from 41% via only EB irradiation to 100% via the combination treatment at 6.3 kGy. The yield of CO to CO
increased from 5.3% to 87.6% by combination with catalytic oxidation. This combination treatment enables the irradiation energy used to deodorize gas streams containing DMS to be reduced.
isomers and 
octupole vibrations in 
shell-stabilized isotonesRobinson, A. P.*; Khoo, T. L.*; Ahmad, I.*; Tandel, S. K.*; Kondev, F. G.*; Nakatsukasa, Takashi*; Seweryniak, D.*; Asai, Masato; Back, B. B.*; Carpenter, M. P.*; et al.
Physical Review C, 78(3), p.034308_1 - 034308_6, 2008/09
Times Cited Count：54 Percentile：91.31(Physics, Nuclear)Isomers have been identified in 
Cm and No with quantum number , which decay through rotational bands built on octupole vibrational states. For isotones with atomic number 
102, the and 2 states have remarkably stable energies, indicating neutron excitations. An exception is a singular minimum in the 2 energy at Cm, due to the additional role of proton configurations.
