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Tripathi, V.*; Bhattacharya, S.*; Rubino, E.*; Benetti, C.*; Perello, J. F.*; Tabor, S. L.*; Liddick, S. N.*; Bender, P. C.*; Carpenter, M. P.*; Carroll, J. J.*; et al.
Physical Review C, 109(4), p.044320_1 - 044320_15, 2024/04
Times Cited Count:0 Percentile:0.00(Physics, Nuclear)no abstracts in English
Tripathi, V.*; Bhattacharya, S.*; Rubino, E.*; Benetti, C.*; Perello, J. F.*; Tabor, S. L.*; Liddick, S. N.*; Bender, P. C.*; Carpenter, M. P.*; Carroll, J. J.*; et al.
Physical Review C, 106(6), p.064314_1 - 064314_14, 2022/12
Times Cited Count:4 Percentile:59.76(Physics, Nuclear)no abstracts in English
Lopez-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:42.73(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.
Hota, 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:7 Percentile:47.36(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.
Chiara, C. J.*; Weisshaar, D.*; Janssens, R. V. F.*; Tsunoda, Yusuke*; Otsuka, Takaharu*; Harker, J. L.*; Walters, W. B.*; Recchia, F.*; Albers, M.*; Alcorta, M.*; et al.
Physical Review C, 91(4), p.044309_1 - 044309_10, 2015/04
Times Cited Count:39 Percentile:91.05(Physics, Nuclear)The neutron-rich isotope Ni was produced by multi-nucleon transfer reactions of
Zn in the Argonne National Laboratory, and an in-beam
-ray experiment were performed using the GRETINA array. The
and
levels of
Ni were observed for the first time. Those levels are regarded as large deformed states associated with proton excitation from the
orbit because they cannot be reproduced by a shell-model calculation assuming a small valence space without
. A theoretical analysis based on the Monte Carlo shell model published in 2014 indicates that those levels corresponds to a prolate deformed band. The present result demonstrates the occurrence of shape coexistence in neutron-rich Ni isotopes other than a known case of
Ni, and confirms the predictive power of the Monte Carlo shell-model calculation.
Henning, 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:82.29(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.
Henning, 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:68.72(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.
Toh, Yosuke; Chiara, C. J.*; McCutchan, E. A.*; Walters, W. B.*; Janssens, R. V. F.*; Carpenter, M. P.*; Zhu, S.*; Broda, R.*; Fornal, B.*; Kay, B. P.*; et al.
Physical Review C, 87(4), p.041304_1 - 041304_5, 2013/04
Times Cited Count:87 Percentile:97.07(Physics, Nuclear)Excited states of Ge have been investigated via the
Ge +
U reaction with
Ge
MeV by use of in-beam
-ray spectroscopy using the
sphere array. The
band was extended considerably and one new band was identified. Comparisons of the
band with collective- and shell-model calculations suggest that
Ge may be a rare example of a nucleus exhibiting rigid triaxial deformation in the low-lying states.
Bender, P. C.*; Tabor, S. L.*; Tripathi, V.*; Hoffman, C. R.*; Hamilton, L.*; Volya, A.*; Clark, R. M.*; Fallon, P.*; Macchiavelli, A. O.*; Paschalis, S.*; et al.
Physical Review C, 85(4), p.044305_1 - 044305_10, 2012/04
Times Cited Count:12 Percentile:55.26(Physics, Nuclear)The available experimental information on P has been greatly increased through the analysis of
decays in coincidence with protons from the interaction of an
O beam at 24 MeV with an
O target. Light charged particles from the reaction were detected with Microball, and multiple
ray coincidences with Gammasphere. Many newly observed
transitions have been identified and placed in the level scheme. Additionally, for most states, spins have been assigned based on measured
ray angular distributions while parities were inferred from lifetimes determined through Doppler-broadened line-shape analysis. Most of the states observed have been interpreted in terms of shell-model calculations using the WBP-a and SDPF-NR interactions having one particle in the 0
or 1
orbital. The two calculations agree almost equally well with the data resulting in root-mean-square differences of about 200 keV. However, two of a few high-lying states may be associated with stretched
states, but the calculations over-predict their energies by 2-3 MeV. Furthermore, a newly observed long-lived 7919-keV state is established for which no explanation is available at present.