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Population and decay of a $$K^{pi}$$ = 8$$^{-}$$ two-quasineutron isomer in $$^{244}$$Pu

$$^{244}$$Puにおける$$K^{pi}$$ = 8$$^{-}$$二準中性子アイソマーの生成と崩壊

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.*; Kay, B. P.*; Khoo, T. L.*; Kondev, F. G.*; Lakshmi, S.*; Lalkovski, S.*; Lauritsen, T.*; Lister, C. J.*; McCutchan, E. A.*; Moran, K.*; Peterson, D.*; Shirwadkar, U.*; Seweryniak, D.*; Stefanescu, I.*; 藤 暢輔 ; Zhu, S.*

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.*; Kay, B. P.*; Khoo, T. L.*; Kondev, F. G.*; Lakshmi, S.*; Lalkovski, S.*; Lauritsen, T.*; Lister, C. J.*; McCutchan, E. A.*; Moran, K.*; Peterson, D.*; Shirwadkar, U.*; Seweryniak, D.*; Stefanescu, I.*; Toh, Yosuke; Zhu, S.*

$$^{244}$$Puにおける$$K^{pi}$$ = 8$$^{-}$$アイソマーからの崩壊と集団的バンド構造が$$^{47}$$Tiと$$^{208}$$Pbのビームによる深部非弾性散乱実験によって調べられた。バンド内の正確な$$M1/E2$$分岐比の測定によって、偶$$Z$$, $$N$$=150アイソトーンにおける$$K^{pi}$$ = 8$$^{-}$$二準中性子アイソマーが9/2$$^-$$[734]$$_{nu}$$$$otimes$$7/2$$^+$$[624]$$_{nu}$$の配位であることを確かめた。$$N$$=152における変形シェルギャップ近傍のこれらのアイソマーは、超重核の一粒子エネルギーの理論的な予言において重要なベンチマークとなる。

The decay of a $$K^{pi}$$ = 8$$^{-}$$ isomer in $$^{244}$$Pu and the collective band structure populating the isomer are studied using deep inelastic excitations with $$^{47}$$Ti and $$^{208}$$Pb beams, respectively. Precise measurements of $$M1/E2$$ branching ratios in the band confirm a clean 9/2$$^-$$[734]$$_{nu}$$$$otimes$$7/2$$^+$$[624]$$_{nu}$$ for the isomer, validating the systematics of K$$^{pi}$$ = 8$$^{-}$$ two-quasineutron isomers observed in even-$$Z$$, $$N$$ = 150 isotones. These isomers around the deformed shell gap at $$N$$ = 152 provide critical benchmarks for theoretical predictions of single-particle energies in this gateway region to superheavy nuclei.

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パーセンタイル:52.92

分野:Physics, Nuclear

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