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Journal Articles

Nuclear structure of $$^{76}$$Ni from the ($$p$$,$$2p$$) reaction

Elekes, Z.*; Kripk$'o$, $'A$*; Sohler, D.*; Sieja, K.*; Ogata, Kazuyuki*; Yoshida, Kazuki; Doornenbal, P.*; Obertelli, A.*; Authelet, G.*; Baba, Hidetada*; et al.

Physical Review C, 99(1), p.014312_1 - 014312_7, 2019/01

https://doi.org/10.1103/PhysRevC.99.014312
 Times Cited Count：10 Percentile：64.15(Physics, Nuclear)

The nuclear structure of the $$^{76}$$Ni nucleus was investigated by ($$p$$,$$2p$$) reaction using a NaI(Tl) array to detect the deexciting prompt $$gamma$$ rays. A new transition with an energy of 2227 keV was identified by $$gamma gamma$$ and $$gamma gamma gamma$$ coincidences. Our shell-model calculations using the Lenzi, Nowacki, Poves, and Sieja interaction produced good candidates for the experimental proton hole states in the observed energy region, and the theoretical cross sections showed good agreement with the experimental values. Although we could not assign all the experimental states to the theoretical ones unambiguously, the results are consistent with a reasonably large Z = 28 shell gap for nickel isotopes in accordance with previous studies.

Journal Articles

Structure of $$^{55}$$Sc and development of the $$N=34$$ subshell closure

Steppenbeck, D.*; Takeuchi, Satoshi*; Aoi, Nori*; Doornenbal, P.*; Matsushita, Masafumi*; Wang, H.*; Baba, Hidetada*; Go, Shintaro*; Holt, J. D.*; Lee, J.*; et al.

Physical Review C, 96(6), p.064310_1 - 064310_10, 2017/12

https://doi.org/10.1103/PhysRevC.96.064310
 Times Cited Count：18 Percentile：80.82(Physics, Nuclear)

no abstracts in English

Journal Articles

Low-lying structure of $$^{50}$$Ar and the $$N$$=32 subshell closure

Steppenbeck, D.*; Takeuchi, Satoshi*; Aoi, Nori*; Doornenbal, P.*; Matsushita, Masafumi*; Wang, H.*; Utsuno, Yutaka; Baba, Hidetada*; Go, Shintaro*; Lee, J.*; et al.

Physical Review Letters, 114(25), p.252501_1 - 252501_6, 2015/06

https://doi.org/10.1103/PhysRevLett.114.252501
 Times Cited Count：44 Percentile：87.83(Physics, Multidisciplinary)

The neutron-rich nucleus $$^{50}$$Ar is produced by the fragmentation reactions of $$^{54}$$Ca, $$^{55}$$Sc, and $$^{56}$$Ti at the RIBF facility in RIKEN, and its deexcited $$gamma$$ rays are observed for the first time. The first $$2^+$$ level in $$^{50}$$Ar is identified to lie at 1178(18)keV from the most intense $$gamma$$-ray spectra. This experimental data, together with the systematics of the $$2^+$$ levels for surrounding nuclei, is analyzed with large-scale shell-model calculations. Consequently, the $$N=32$$ sub-shell gap in $$^{50}$$Ar is equivalent to that of $$^{52}$$Ca, thus making the $$2^+$$ level in $$^{50}$$Ar higher than that of $$^{48}$$Ar. The shell-model calculation also predicts that the $$N=34$$ sub-shell gap enhances in going from Ca to Ar, which will be verified by forthcoming experiments for $$^{52}$$Ar.

Journal Articles

Evidence for a new nuclear "magic number" from the level structure of $$^{54}$$Ca

Steppenbeck, D.*; Takeuchi, Satoshi*; Aoi, Nori*; Doornenbal, P.*; Matsushita, Masafumi*; Wang, H.*; Baba, Hidetada*; Fukuda, Naoki*; Go, Shintaro*; Homma, Michio*; et al.

Nature, 502(7470), p.207 - 210, 2013/10

https://doi.org/10.1038/nature12522
 Times Cited Count：285 Percentile：99.78(Multidisciplinary Sciences)

no abstracts in English

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