The ³He long-counter TETRA at the ALTO ISOL facility

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• 作者：D. Testov^a ; ^b ; ^{dumon@jinr.ru" class="auth_mail" title="E-mail the corresponding author} ; D. Verney^a ; B. Roussiè ; re^a ; J. Bettane^a ; F. Didierjean^c ; K. Flanagan^d ; S. Franchoo^a ; F. Ibrahim^a ; E. Kuznetsova^a ; R. Li^a ; B. Marsh^f ; I. Matea^a ; Yu. Penionzhkevich^b ; ^e ; H. Pai^g ; V. Smirnov^b ; E. Sokol^b ; I. Stefan^a ; D. Suzuki^a ; J.N. Wilson^a
• 关键词：3He counters ; β-Decay ; Neutron emission ; Radioactive beams (RIB)
• 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 出版年：2016
• 出版时间：11 April 2016
• 年：2016
• 卷：815
• 期：Complete
• 页码：96-103
• 全文大小：1568 K

文摘

A new β$\mathrm{\beta }$-decay station (BEDO) has been installed behind the PARRNe mass separator operated on-line at the electron-driven ALTO ISOL facility. The station is equipped with a movable tape collector allowing the creation of the radioactive sources of interest at the very center of a modular detection system. The mechanical structure was designed to host various assemblies of detectors in compact geometry. We report here the first on-line use of this system equipped with the 4π ³He neutron counter TETRA built at JINR Dubna associated with HPGe and plastic 4π β detectors. The single neutron detection efficiency achieved is 53(2)% measured using the ²⁵²Cf source. For β-delayed neutron measurements the neutron detection efficiency was derived from the comparison of gated γ-spectra. The on-line commissioning of the TETRA setup was performed with laser-ionized gallium beams. β and neutron events were recorded as a function of time. From these data we report P_1n(⁸²Ga)=22(2)% and T_1/2$T_{1/2}$(⁸²Ga)=0.604(11) s in good agreement with values available in the literature. The new detection system will be used in other experiments aimed at investigations of β-decay properties of neutron-rich isotopes produced at ALTO.