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論文

Observation of collective modes of excitations in $$^{59}$$Co, $$^{59}$$Ni, and $$^{61}$$Co and the influence of the $$g_{9/2}$$ orbital

Ajayi, S.*; Tripathi, V.*; Rubino, E.*; Bhattacharya, S.*; Baby, L. T.*; Lubna, R. S.*; Benetti, C.*; Wibisono, C.*; Wheeler, M. B.*; Tabor, S. L.*; et al.

Physical Review C, 109(1), p.014305_1 - 014305_21, 2024/01

https://doi.org/10.1103/PhysRevC.109.014305
 被引用回数：0

フロリダ州立大学のタンデム加速器にて$$^{59}$$Co, $$^{59}$$Niと$$^{61}$$Coの励起状態を生成し、そこからの脱励起ガンマ線からエネルギー準位を得た。$$^{59}$$Coについては$$31/2^{(+)}$$までの、$$^{59}$$Niについては$$(41/2^+)$$までの高スピン状態が得られた。これらの結果を$$pf$$殻から$$g_{9/2}$$-$$d_{5/2}$$軌道に1個までの励起を許す大規模殻模型計算と比較した結果、スピンがかなり大きなもの以外のイラスト状態の励起エネルギーをよく再現した。再現できなかった高スピン状態は、多粒子多空孔励起が主であると考えられる。また、殻模型計算からは、これらの高スピン状態のいくつかは$$M1$$遷移強度が強い$$M1$$バンドと考えられる。

論文

Spectroscopy of $$^{153}$$Gd and $$^{157}$$Gd using the ($$p,d gamma$$) reaction

Ross, T. J.*; Hughes, R. O.*; Allmond, J. M.*; Beausang, C. W.*; Angell, C.; Basunia, M. S.*; Bleuel, D. L.*; Hurke, J. T.*; Casperson, R. J.*; Escher, J. E.*; et al.

Physical Review C, 90(4), p.044323_1 - 044323_12, 2014/10

https://doi.org/10.1103/PhysRevC.90.044323
 被引用回数：7 パーセンタイル：47.12(Physics, Nuclear)

Low-spin single quasi neutron levels in $$^{153}$$Gd and $$^{157}$$Gd have been studied following the $$^{154}$$Gd ($$p,d gamma$$) $$^{153}$$Gd and $$^{158}$$Gd ($$p,d gamma$$) $$^{157}$$Gd reactions. A combined Si telescope and high-purity germanium array was utilized, allowing $$d$$-$$gamma$$ and $$d$$-$$gamma$$-$$gamma$$ coincidence measurements. Almost all of the established low-excitation-energy, low-spin structures were confirmed in both $$^{153}$$Gd and $$^{157}$$Gd. Several new levels and numerous new $$gamma$$ rays are observed in both nuclei, particularly for $$Ex$$ $$geq$$ 1 MeV. Residual effects of a neutron sub shell closure at $$N$$ = 64 are observed in the form of a large excitation energy gap in the single quasi neutron level schemes.

論文

Remnants of spherical shell structures in deformed nuclei; The Impact of an $$N$$ = 64 neutron subshell closure on the structure of $$N$$ $${approx}$$ 90 gadolinium nuclei

Ross, T. J.*; Hughes, R. O.*; Beausang, C. W.*; Allmond, J. M.*; Angell, C.; Basunia, M. S.*; Bleuel, D. L.*; Burke, J. T.*; Casperson, R. J.*; Escher, J. E.*; et al.

Physical Review C, 88(3), p.031301_1 - 031301_4, 2013/09

AA2013-0388.pdf:0.32MB

https://doi.org/10.1103/PhysRevC.88.031301
 被引用回数：7 パーセンタイル：48.08(Physics, Nuclear)

Odd-mass gadolinium isotopes around $$N$$ = 90 were populated by the ($$p,d$$) reaction, utilizing 25-MeV protons, resulting in population of low-spin quasi-neutron states at energies near and below the Fermi surface. Systematics of the single quasi-neutron levels populated are presented. A large excitation energy gap is observed between levels originating from the $$2d_{3/2}$$, $$1h_{11/2}$$ and $$3s_{1/2}$$ spherical parents (above the $$N$$ = 64 gap), and the $$2d_{5/2}$$ (below the gap) indicating that the spherical shell model level spacing is maintained at least to moderate deformations.

論文

Spectroscopy of $$^{88}$$Y by the ($$p,dgamma$$) reaction

Ross, T. J.*; Beausang, C. W.*; Hughes, R. O.*; Scielzo, N. D.*; Burke, J. T.*; Allmond, J. M.*; Angell, C.; Basunia, M. S.*; Bleuel, D. L.*; Casperson, R. J.*; et al.

Physical Review C, 86(6), p.067301_1 - 067301_5, 2012/12

AA2012-0565.pdf:0.38MB

https://doi.org/10.1103/PhysRevC.86.067301
 被引用回数：3 パーセンタイル：22.73(Physics, Nuclear)

Low-spin, high-excitation energy states in $$^{88}$$Y have been studied using the $$^{89}$$Y($$p,dgamma$$) reaction. For this experiment a 25 MeV proton beam was incident upon a mono-isotopic $$^{89}$$Y target. A silicon telescope array was used to detect deuterons and coincident $$gamma$$ rays were detected using a germanium clover array. Most of the known low-excitation energy low-spin states populated strongly via the ($$p,d$$) reaction mechanism are confirmed. Two states are seen for the first time and seven new transitions, including one which by-passes the two low-lying isomeric states, are observed.

論文

Measurement of the entry-spin distribution imparted to the high excitation continuum region of gadolinium nuclei via ($$p$$,$$d$$) and ($$p$$,$$t$$) reactions

Ross, T. J.*; Beausang, C. W.*; Hughes, R. O.*; Allmond, J. M.*; Angell, C.; Basunia, M. S.*; Bleuel, D. L.*; Burke, J. T.*; Casperson, R. J.*; Escher, J. E.*; et al.

Physical Review C, 85(5), p.051304_1 - 051304_5, 2012/05

AA2012-0155.pdf:0.62MB

https://doi.org/10.1103/PhysRevC.85.051304
 被引用回数：11 パーセンタイル：53.65(Physics, Nuclear)

代理反応法は、20%の精度でアクチニド核の中性子捕獲断面積を評価することができるが、希土類核に対しては、直接測定した中性子捕獲断面積と2$$sim$$3倍の不一致がある。これは、スピン/パリティの生成分布の違いによるものであると考えられる。このことを確かめるために、代理反応におけるガドリニウム核の角運動量移行の測定を行った。

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