Inverse kinematics reactions studies using the WINDS slow neutron detector and the SAMURAI spectrometer

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• 作者：J. Yasuda^a ; ^{yasuda@phys.kyushu-u.ac.jp" class="auth_mail" title="E-mail the corresponding author} ; M. Sasano^b ; R.G.T. Zegers^c ; H. Baba^b ; W. Chao^b ; M. Dozono^b ; N. Fukuda^b ; N. Inabe^b ; T. Isobe^b ; G. Jhang^b ; D. Kameda^b ; T. Kubo^b ; M. Kurata-Nishimura^b ; E. Milman^b ; T. Motobayashi^b ; H. Otsu^b ; V. Panin^b ; W. Powell^b ; H. Sakai^b ; M. Sako^b ; H. Sato^b ; Y. Shimizu^b ; L. Stuhl^b ; H. Suzuki^b ; S. Tangwancharoen^b ; H. Takeda^b ; T. Uesaka^b ; K. Yoneda^b ; J. Zenihiro^b ; T. Kobayashi^d ; T. Sumikama^d ; T. Tako^d ; T. Nakamura^e ; Y. Kondo^e ; Y. Togano^e ; M. Shikata^e ; J. Tsubota^e ; K. Yako^f ; S. Shimoura^f ; S. Ota^f ; S. Kawase^f ; Y. Kubota^f ; M. Takaki^f ; S. Michimasa^f ; K. Kisamori^f ; C.S. Lee^f ; H. Tokieda^f ; M. Kobayashi^f ; S. Koyama^g ; N. Kobayashi^g
• 关键词：Neutron detector ; (p ; n)(p ; n) reaction ; Spin isospin response ; Gamow&ndash ; Teller transition
• 刊名：Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
• 出版年：2016
• 出版时间：1 June 2016
• 年：2016
• 卷：376
• 期：Complete
• 页码：393-396
• 全文大小：1200 K

文摘

We have combined the low-energy neutron detector WINDS (Wide-angle Inverse-kinematics Neutron Detectors for SHARAQ) and the SAMURAI spectrometer at RIKEN Nishina Center RI Beam Factory (RIBF) in order to perform class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0168583X16001245&_mathId=si27.gif&_user=111111111&_pii=S0168583X16001245&_rdoc=1&_issn=0168583X&md5=b8d165db8b09ec29b28a730aab26475d" title="Click to view the MathML source">(p,n)class="mathContainer hidden">class="mathCode">$(p\text{,}n)$ reactions in inverse kinematics for unstable nuclei in the mass region around class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0168583X16001245&_mathId=si28.gif&_user=111111111&_pii=S0168583X16001245&_rdoc=1&_issn=0168583X&md5=6c362d5ac850a9e211fad15a5e1268b1" title="Click to view the MathML source">A∼100class="mathContainer hidden">class="mathCode">$A\sim 100$. In this setup, WINDS is used for detecting recoil neutrons and the SAMURAI spectrometer is used for tagging decay channel of heavy residue. The first experiment by using the setup was performed to study Gamow–Teller transitions from class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0168583X16001245&_mathId=si7.gif&_user=111111111&_pii=S0168583X16001245&_rdoc=1&_issn=0168583X&md5=8d92751a3643da8bc7c46c8331b6435b" title="Click to view the MathML source">¹³²Snclass="mathContainer hidden">class="mathCode">${}^{132}\text{Sn}$ in April 2014. The atomic number Z   and mass-to-charge ratio class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0168583X16001245&_mathId=si30.gif&_user=111111111&_pii=S0168583X16001245&_rdoc=1&_issn=0168583X&md5=14f4a465710ae63eec3c1089cbf6c7c5" title="Click to view the MathML source">A/Qclass="mathContainer hidden">class="mathCode">$A/Q$ of the beam residues were determined from the measurements of time of flight, magnetic rigidity and energy loss. The obtained class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0168583X16001245&_mathId=si30.gif&_user=111111111&_pii=S0168583X16001245&_rdoc=1&_issn=0168583X&md5=14f4a465710ae63eec3c1089cbf6c7c5" title="Click to view the MathML source">A/Qclass="mathContainer hidden">class="mathCode">$A/Q$ and Z   resolutions were class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0168583X16001245&_mathId=si32.gif&_user=111111111&_pii=S0168583X16001245&_rdoc=1&_issn=0168583X&md5=cdcab53ccc4dcb397bf3c6cebf31e1b0" title="Click to view the MathML source">σ_A/Q=0.14%class="mathContainer hidden">class="mathCode">${\sigma }_{A/Q}=0.14\%$ and class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0168583X16001245&_mathId=si33.gif&_user=111111111&_pii=S0168583X16001245&_rdoc=1&_issn=0168583X&md5=bea87075a67e88749279dffaf8d64840" title="Click to view the MathML source">σ_Z=0.22class="mathContainer hidden">class="mathCode">${\sigma }_Z=0.22$, respectively. Furthermore, owing to the large momentum acceptance (class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0168583X16001245&_mathId=si34.gif&_user=111111111&_pii=S0168583X16001245&_rdoc=1&_issn=0168583X&md5=71ce7ec3a684417df039fc5171efb3dd" title="Click to view the MathML source">50%class="mathContainer hidden">class="mathCode">$50\%$) of SAMURAI, the beam residues associated with the class="mathmlsrc">class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0168583X16001245&_mathId=si35.gif&_user=111111111&_pii=S0168583X16001245&_rdoc=1&_issn=0168583X&md5=211b28697d9e4f9c5ce3f63223788ce8" title="Click to view the MathML source">γclass="mathContainer hidden">class="mathCode">$\gamma$, 1n and 2n decay channel were measured in the same magnetic field setting. The kinematic loci of the measured recoil neutron energy and laboratory angle are clearly seen. It shows that the excitation energy up to about 20 MeV can be reconstructed.