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論文

A Method for estimating light quenching in inorganic scintillator detectors for radioactive ion beam experiments

Kreider, B.; Cox, I.*; Grzywacz, R.*; Allmond, J. M.*; 西尾 勝久; 他23名*

Nuclear Instruments and Methods in Physics Research A, 1085, p.171298_1 - 171298_7, 2026/05

https://doi.org/10.1016/j.nima.2026.171298
 被引用回数：0 パーセンタイル：0.00(Instruments & Instrumentation)

In recent experiments, inorganic scintillators have been used to study the decays of exotic nuclei, providing an alternative to silicon detectors and enabling measurements that were previously impossible. However, proper use of these materials requires us to understand and quantify the scintillation process, specifically in response to very heavy nuclei. In this work, we show a simplified method based on the models of Birks (1951) and Meyer and Murray (1962) to parametrize the light output of inorganic scintillators in response to beams of energetic heavy ions over a broad range of energies. We test the accuracy of our parametrization approach by calculating light output and quenching factors for various ions and comparing them with experimental data from Lutetium Yttrium Orthosilicate (LYSO:Ce), a common inorganic scintillator. The Meyer-Murray model suggests that, for sufficiently heavy ions at high energies, the majority of the light output is associated with the creation of delta electrons, which are induced by the passage of the beam through the material. These delta electrons dramatically impact the response of detection systems when subject to ions with velocities typical of beams in modern fragmentation facilities. To illustrate this, we also present a qualitative estimate of the effects of delta rays on overall light output using the Birks-Meyer-Murray parametrization. The approach presented herein will serve as a basic framework for further, more rigorous studies of scintillator response to heavy ions. This work is a crucial first step in planning future experiments where energetic exotic nuclei are interacting with scintillator detectors.

論文

New isomeric transition in $$^{36}$$Mg; Bridging the $$N = 20$$ and $$N = 28$$ islands of inversion

Madurga, M.*; Christie, J. M.*; Xu, Z.*; Grzywacz, R.*; Poves, A.*; King, T.*; Allmond, J. M.*; Chester, A.*; Cox, I.*; Farr, J.*; et al.

Physical Review C, 109(6), p.L061301_1 - L061301_6, 2024/06

https://doi.org/10.1103/PhysRevC.109.L061301
 被引用回数：4 パーセンタイル：64.34(Physics, Nuclear)

ミシガン州立大学の国立超伝導サイクロトロン研究所にて$$^{48}$$Caからのフラグメンテーション反応によって中性子過剰核$$^{36}$$Mgを生成、分離し、そのアイソマーを探した。その結果、168keVのガンマ線を出して$$2^+$$に半減期約90nsで脱励起するアイソマーを発見した。その性質を議論するため、大規模殻模型計算の結果と比較した。Mg同位体では中性子数20から28領域にかけて広く変形核となることが知られているが、理論的には、前者の領域は$$sd$$殻から2個の中性子が励起することによって変形し、後者の領域は中性子数28の殻ギャップからの中性子励起によって変形する。$$^{36}$$Mgはその中間に位置し、両者の状態が近くに存在することで、励起エネルギーの低い$$0^+$$が出現すると理解される。

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：1 パーセンタイル：22.55(Physics, Nuclear)

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：43.54(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：44.79(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：21.58(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：50.98(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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