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Journal Articles

$$beta$$ decay of $$^{38,40}$$Si ($$T_z$$ = +5, +6) to low-lying core excited states in odd-odd $$^{38,40}$$P isotopes

Tripathi, V.*; Lubna, R. S.*; Abromeit, B.*; Crawford, H. L.*; Liddick, S. N.*; Utsuno, Yutaka; Bender, P. C.*; Crider, B. P.*; Dungan, R.*; Fallon, P.*; et al.

Physical Review C, 95(2), p.024308_1 - 024308_7, 2017/02

AA2016-0485.pdf:0.5MB

 Times Cited Count:3 Percentile:39.76(Physics, Nuclear)

no abstracts in English

Journal Articles

Identification of deformed intruder states in semi-magic $$^{70}$$Ni

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:22 Percentile:7.02(Physics, Nuclear)

The neutron-rich isotope $$^{70}$$Ni was produced by multi-nucleon transfer reactions of $$^{70}$$Zn in the Argonne National Laboratory, and an in-beam $$gamma$$-ray experiment were performed using the GRETINA array. The $$2^+_2$$ and $$4^+_2$$ levels of $$^{70}$$Ni were observed for the first time. Those levels are regarded as large deformed states associated with proton excitation from the $$f_{7/2}$$ orbit because they cannot be reproduced by a shell-model calculation assuming a small valence space without $$f_{7/2}$$. 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 $$^{68}$$Ni, and confirms the predictive power of the Monte Carlo shell-model calculation.

Journal Articles

Multi-intruder structures in $$^{34}$$P

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:11 Percentile:35.22(Physics, Nuclear)

The available experimental information on $$^{34}$$P has been greatly increased through the analysis of $$gamma$$ decays in coincidence with protons from the interaction of an $$^{18}$$O beam at 24 MeV with an $$^{18}$$O target. Light charged particles from the reaction were detected with Microball, and multiple $$gamma$$ ray coincidences with Gammasphere. Many newly observed $$gamma$$ transitions have been identified and placed in the level scheme. Additionally, for most states, spins have been assigned based on measured $$gamma$$ 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$$f$$$$_{7/2}$$ or 1$$p$$$$_{3/2}$$ 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 $$pi$$$$f$$$$_{7/2}$$ $$otimes$$ $$nu$$$$f$$$$_{7/2}$$ 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.

Journal Articles

Two-proton knockout from $$^{32}$$Mg; Intruder amplitudes in $$^{30}$$Ne and implications for the binding of $$^{29,31}$$F

Fallon, P.*; Rodriguez-Vieitez, E.*; Macchiavelli, A. O.*; Gade, A.*; Tostevin, J. A.*; Adrich, P.*; Bazin, D.*; Bowen, M.*; Campbell, C. M.*; Clark, R. M.*; et al.

Physical Review C, 81(4), p.041302_1 - 041302_5, 2010/04

 Times Cited Count:33 Percentile:9.55(Physics, Nuclear)

no abstracts in English

Journal Articles

Intruder excitations in $$^{35}$$P

Wiedeking, M.*; Rodriguez-Vieitez, E.*; Fallon, P.*; Carpenter, M. P.*; Clark, R. M.*; Cline, D.*; Cromaz, M.*; Descovich, M.*; Janssens, R. V. F.*; Lee, I.-Y.*; et al.

Physical Review C, 78(3), p.037302_1 - 037302_4, 2008/09

 Times Cited Count:9 Percentile:40.81(Physics, Nuclear)

no abstracts in English

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