検索対象:     
報告書番号:
※ 半角英数字
 年 ~ 
 年

Neutron-proton pairing competition in $$N=Z$$ nuclei; Metastable state decays in the proton dripline nuclei $$^{82}_{41}$$Nb and $$^{86}_{43}$$Tc

$$N=Z$$原子核における中性子と陽子の対相関の競合; 陽子ドリップライン原子核$$^{82}_{41}$$Nbと$$^{86}_{43}$$Tcのアイソマー崩壊

Garnsworthy, A. B.*; Regan, P. H.*; C$'a$ceres, L.*; Pietri, S.*; Sun, Y.*; Rudolph, D.*; G$'o$rska, M.*; Podoly$'a$k, Z.*; Steer, S. J.*; Hoischen, R.*; Heinz, A.*; Becker, F.*; Bednarczyk, P.*; Doornenbal, P.*; Geissel, H.*; Gerl, J.*; Grawe, H.*; Gr$c{e}$bosz, J.*; Kelic, A.*; Kojouharov, I.*; Kurz, N.*; Montes, F.*; Prokopowicz, W.*; 斉藤 武彦*; Schaffner, H.*; Tashenov, S.*; Werner-Malento, E.*; Wollersheim, H. J.*; Benzoni, G.*; Blank, B. B.*; Brandau, C.*; Bruce, A. M.*; Camera, F.*; Catford, W. N.*; Cullen, I. J.*; Dombr$'a$di, Zs.*; Estevez, E.*; Gelletly, W.*; Ilie, G.*; Jolie, J.*; Jones, G. A.*; Jungclaus, A.*; Kmiecik, M.*; Kondev, F. G.*; Kurtukian-Nieto, T.*; Lalkovski, S.*; Liu, Z.*; Maj, A.*; Myalski, S.*; Pf$"u$tzner, M.*; Schwertel, S.*; 静間 俊行; Simons, A. J.*; Walker, P. M.*; Wieland, O.*; Xu, F. R.*

Garnsworthy, A. B.*; Regan, P. H.*; C$'a$ceres, L.*; Pietri, S.*; Sun, Y.*; Rudolph, D.*; G$'o$rska, M.*; Podoly$'a$k, Z.*; Steer, S. J.*; Hoischen, R.*; Heinz, A.*; Becker, F.*; Bednarczyk, P.*; Doornenbal, P.*; Geissel, H.*; Gerl, J.*; Grawe, H.*; Gr$c{e}$bosz, J.*; Kelic, A.*; Kojouharov, I.*; Kurz, N.*; Montes, F.*; Prokopowicz, W.*; Saito, Takehiko*; Schaffner, H.*; Tashenov, S.*; Werner-Malento, E.*; Wollersheim, H. J.*; Benzoni, G.*; Blank, B. B.*; Brandau, C.*; Bruce, A. M.*; Camera, F.*; Catford, W. N.*; Cullen, I. J.*; Dombr$'a$di, Zs.*; Estevez, E.*; Gelletly, W.*; Ilie, G.*; Jolie, J.*; Jones, G. A.*; Jungclaus, A.*; Kmiecik, M.*; Kondev, F. G.*; Kurtukian-Nieto, T.*; Lalkovski, S.*; Liu, Z.*; Maj, A.*; Myalski, S.*; Pf$"u$tzner, M.*; Schwertel, S.*; Shizuma, Toshiyuki; Simons, A. J.*; Walker, P. M.*; Wieland, O.*; Xu, F. R.*

$$^{107}$$Agビームの破砕反応におけるアイソマー崩壊の$$gamma$$線測定により、中性子数と陽子数が同じ$$^{82}_{41}$$Nbと$$^{86}_{43}$$Tc原子核の低励起状態の核構造を明らかにした。$$^{82}_{41}$$Nbと$$^{86}_{43}$$Tc原子核は、これまでに内部崩壊が観測された最も重い$$N=Z$$の奇々核である。$$^{82}_{41}$$Nbと$$^{86}_{43}$$Tc原子核の準位様式は、2重閉殻核$$^{56}_{28}$$Niと$$^{100}_{50}$$Sn核の間にあるN=Z核の原子核形を明らかにし、$$T_z=0$$を持つ奇々核の$$T=1$$状態がエネルギー的に優位であることを支持する。射影殻模型との比較により、$$^{82}$$Nbの崩壊は、荷電スピンが変化することによる$$K$$アイソマーとして解釈される。

The low-lying structures of the self-conjugate ($$N=Z$$) nuclei $$^{82}_{41}$$Nb and $$^{86}_{43}$$Tc have been investigated using isomeric-decay spectroscopy following the projectile fragmentation of a $$^{107}$$Ag beam. These represent the heaviest odd-odd $$N=Z$$ nuclei in which internal decays have been identified to date. The resulting level schemes shed light on the shape evolution along the $$N=Z$$ line between the doubly-magic systems $$^{56}_{28}$$Ni and $$^{100}_{50}$$Sn and support a preference for $$T=1$$ states in $$T_z=0$$ odd-odd nuclei at low excitation energies associated with a $$T=1$$ neutron-proton pairing gap. Comparison with Projected Shell Model calculations suggests that the decay in $$^{82}$$Nb may be interpreted as an isospin-changing $$K$$ isomer.

Access

:

- Accesses

InCites™

:

パーセンタイル:19.12

分野:Astronomy & Astrophysics

Altmetrics

:

[CLARIVATE ANALYTICS], [WEB OF SCIENCE], [HIGHLY CITED PAPER & CUP LOGO] and [HOT PAPER & FIRE LOGO] are trademarks of Clarivate Analytics, and/or its affiliated company or companies, and used herein by permission and/or license.