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論文

Improved measurement of the $$0_2^+rightarrow0_1^+$$ $$E$$0 transition strength for $$^{72}$$Se using the SPICE spectrometer

Smallcombe, J.; Garnsworthy, A. B.*; Korten, W.*; Singh, P.*; Ali, F. A.*; Andreoiu, C.*; Ansari, S.*; Ball, G. C.*; Barton, C. J.*; Bhattacharjee, S. S.*; et al.

Physical Review C, 106(1), p.014312_1 - 014312_9, 2022/07

 被引用回数:2 パーセンタイル:68.81(Physics, Nuclear)

The selenium isotopes lie at the heart of a tumultuous region of the nuclear chart where shape coexistence effects grapple with neutron-proton pairing correlations, triaxiality, and the impending proton dripline. In this work a study of $$^{72}$$Se by internal conversion electron and $$gamma$$-ray spectroscopy was undertaken with the SPICE and TIGRESS arrays. New measurements of the branching ratio and lifetime of the $$0_2^+$$ state were performed yielding a determination of $$rho^2(E0; 0_2^+{rightarrow}0_1^+)=29(3)$$ milliunits. Two state mixing calculations were performed that highlighted the importance of interpretation of such $$E0$$ strength values in the context of shape-coexistence.

論文

Isomeric states observed in heavy neutron-rich nuclei populated in the fragmentation of a $$^{208}$$Pb beam

Steer, S. J.*; Podoly$'a$k, Z.*; Pietri, S.*; G$'o$rska, M.*; Grawe, H.*; Maier, K.*; Regan, P. H.*; Rudolph, D.*; Garnsworthy, A. B.*; Hoischen, R.*; et al.

Physical Review C, 84(4), p.044313_1 - 044313_22, 2011/10

 被引用回数:61 パーセンタイル:94.44(Physics, Nuclear)

核子あたり1GeVの$$_{82}^{208}$$Pbを用いて核破砕反応により中性子過剰重原子核を生成した。反跳質量分析法により破砕核を分離し、核種を同定した。核異性体から放出される遅延$$gamma$$線の測定により、49核異性体の検出に成功した。殻模型やBCS計算を用いて、これらの核異性体の準位構造を明らかにした。

口頭

Study of $$^{70,72}$$Se nuclear shapes with SPICE and TIGRESS

Smallcombe, J.; Garnsworthy, A. B.*; Korten, W.*; Singh, P.*; Ali, F. A.*; Andreoiu, C.*; Ansari, S.*; Ball, G. C.*; Barton, C. J.*; Bhattacharjee, S. S.*; et al.

no journal, , 

The phenomenon of shape coexistence is prevalent in the Z$$sim$$34 region, with isotopes of neutron-deficient even Ge, Se and Kr each exhibiting the characteristic low-lying coexisting 0+ bands which display quadrupole deformation different to that of the ground states. In the selenium isotopes, $$^{72-78}$$Se seem to show a prolate ground structure with shape coexisting oblate excitation, while in $$^{68}$$Se the oblate structure appears to have become the ground state. The exact nature of the low-lying structure $$^{70}$$Se and any shape coexistence remains uncertain. Combining the Spectrometer for Internal Conversion Electrons (SPICE) with the TIGRESS HPGe Array, a full electron and gamma-ray experimental study of $$^{70}$$Se, $$^{72}$$Se was undertaken at the TRIUMF ISAC-II facility to unveil the low-lying structure of these nuclei. Details of the device and experiment will be presented, alongside the experimental results and possible structural interpretations for both isotopes.

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