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$$alpha$$-decay of the new isotope $$^{187}$$Po; Probing prolate structures beyond the neutron mid-shell at N = 104

新同位体$$^{187}$$Poの$$alpha$$崩壊; 中性子数104ミッドシェル領域のプロレート変形の解明

Andreyev, A. N.*; Antalic, S.*; Ackermann, D.*; Franchoo, S.*; He${ss}$berger, F. P.*; Hofmann, S.*; Huyse, M.*; Kojouharov, I.*; Kindler, B.*; Kuusiniemi, P.*; Lesher, S. R.*; Lommel, B.*; Mann, R.*; M$"u$nzenberg, G.*; 西尾 勝久; Page, R. D.*; Ressler, J. J.*; Streicher, B.*; Saro, S.*; Sulignano, B.*; Van Duppen, P.*; Wiseman, D.*; Wyss, R.*

Andreyev, A. N.*; Antalic, S.*; Ackermann, D.*; Franchoo, S.*; He${ss}$berger, F. P.*; Hofmann, S.*; Huyse, M.*; Kojouharov, I.*; Kindler, B.*; Kuusiniemi, P.*; Lesher, S. R.*; Lommel, B.*; Mann, R.*; M$"u$nzenberg, G.*; Nishio, Katsuhisa; Page, R. D.*; Ressler, J. J.*; Streicher, B.*; Saro, S.*; Sulignano, B.*; Van Duppen, P.*; Wiseman, D.*; Wyss, R.*

The new neutron-deficient isotope $$^{187}$$Po has been identified in the complete fusion reaction $$^{46}$$Ti+$$^{144}$$Sm $$rightarrow$$ $$^{187}$$Po+3n at the velocity filter SHIP of GSI. Striking features of the $$^{187}$$Po $$alpha$$ decay are the strongly-hindered decay to the spherical ground state and unhindered decay to a surprisingly low-lying deformed excited state at 286 keV in the daughter nucleus $$^{183}$$Pb. Based on the potential energy surface calculations, the $$^{187}$$Po ground state and the 286 keV excited state in $$^{183}$$Pb were interpreted as being of prolate origin.

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パーセンタイル:13.82

分野:Physics, Nuclear

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