<p>A new multi-detector array named HALIMA (Hybrid Array for LIfetime MeAsurement) has been developed at Lanzhou for nuclear structure studies in fission. The array comprises eight BGO-shielded High-Purity Germanium detectors and twenty fast Ce-doped Lanthanum Bromide [LaBr<InlineEquation ID="IEq1"> <EquationSource Format="TEX">$_3$</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mn>3</mn> <mrow /> </mmultiscripts> </math></EquationSource> </InlineEquation>(Ce)] detectors shielded with CsI(Tl). HALIMA is further complemented by two ancillary detector systems: fission fragment (FF) detectors and <InlineEquation ID="IEq2"> <EquationSource Format="TEX">$\beta$</EquationSource> <EquationSource Format="MATHML"><math> <mi>β</mi> </math></EquationSource> </InlineEquation> detectors. This configuration enables precise sub-nanosecond lifetime measurements using the fourfold FF/<InlineEquation ID="IEq3"> <EquationSource Format="TEX">$\beta$</EquationSource> <EquationSource Format="MATHML"><math> <mi>β</mi> </math></EquationSource> </InlineEquation>-Ge-LaBr<InlineEquation ID="IEq4"> <EquationSource Format="TEX">$_3$</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mn>3</mn> <mrow /> </mmultiscripts> </math></EquationSource> </InlineEquation>(Ce)-LaBr<InlineEquation ID="IEq5"> <EquationSource Format="TEX">$_3$</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mn>3</mn> <mrow /> </mmultiscripts> </math></EquationSource> </InlineEquation>(Ce) coincidence technique. The performance and specifications of the detectors, associated electronics, and the data acquisition system are presented in detail. The advantage of FF selectivity is emphasized, which significantly enhances sensitivity to specific fission channels. Using this approach, the lifetimes of the nuclear excited states populated in the spontaneous fission of <InlineEquation ID="IEq6"> <EquationSource Format="TEX">$^{252}$</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mrow /> <mn>252</mn> </mmultiscripts> </math></EquationSource> </InlineEquation>Cf were measured, showing good agreement with the established literature values.</p>

HALIMA: a hybrid array for lifetime measurement of neutron-rich nuclei at IMP

期刊论文
发表日期：

2026年1月3日

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Zi-Hao Jia,
Yong-De Fang,
Si-Cheng Wang,
Wei Hua,
Hong-Yi Wu,
Guang-Xin Zhang,
Cen-Xi Yuan,
Zhi-Xuan Wang,
Jun-Hong Xu,
Jian-Hong Li,
Wen Liang,
Yu-Hong Tan,
Wen-Jun Pan,
Yu-Xuan Ren,
M. Kumar Raju,
Song Guo,
Guang-Shun Li,
Yun-Hua Qiang,
Min-Liang Liu,
Bing Ding,
Ming-Hui Huang,
Ning-Tao Zhang,
Bing-Shui Gao,
Peng Ma,
He-Run Yang,
Ruo-Fu Chen,
Hai-Xia Li,
Rong-Hua Li,
Xiu-Hua Wang,
Cui-Hong Chen,
Hai-Bo Yang,
Jian-Song Wang,
Xiao-Hui Sun,
Zhi-Huan Li,
Hui Hua,
Wei Wang,
Xin-Xing Xu,
Xiao-Hong Zhou,
Zai-Guo Gan,
Yu-Hu Zhang

摘要

A new multi-detector array named HALIMA (Hybrid Array for LIfetime MeAsurement) has been developed at Lanzhou for nuclear structure studies in fission. The array comprises eight BGO-shielded High-Purity Germanium detectors and twenty fast Ce-doped Lanthanum Bromide [LaBr $_3$ $_{3}$ (Ce)] detectors shielded with CsI(Tl). HALIMA is further complemented by two ancillary detector systems: fission fragment (FF) detectors and $\beta$ $β$ detectors. This configuration enables precise sub-nanosecond lifetime measurements using the fourfold FF/ $\beta$ $β$ -Ge-LaBr $_3$ $_{3}$ (Ce)-LaBr $_3$ $_{3}$ (Ce) coincidence technique. The performance and specifications of the detectors, associated electronics, and the data acquisition system are presented in detail. The advantage of FF selectivity is emphasized, which significantly enhances sensitivity to specific fission channels. Using this approach, the lifetimes of the nuclear excited states populated in the spontaneous fission of $^{252}$ $^{252}$ Cf were measured, showing good agreement with the established literature values.