Pionic fusion study of the p>6p>He halo

详细信息	查看全文 | 推荐本文 |

• 作者：M. Andersson ; Chr. Bargholtz ; Kj. Fransson ; E. Fumero ; L. Ger&#xe9 ; n ; L. Holmberg ; K. Lindh ; L. M&#xe5 ; rtensson ; I. Sitnikova ; P.-E. Tegn&#xe9 ; r et al.
• 关键词：Nuclear reactions ; d + p>4p>He ; me="mml7">none ; color ; black" href="/science?_ob=MathURL&_method=retrieve&_udi=B6TVB-4KYY4GC-3&_mathId=mml7&_user=10&_cdi=5530&_rdoc=4&_handle=V-WA-A-W-AD-MsSAYZW-UUA-U-AAZCWEZAYU-AAZWYD
• 刊名：Nuclear Physics A
• 出版年：2006
• 期刊代码：44_03759474
• 类别：ph
• 出版时间：27 November 2006
• 卷：779
• 期：Complete
• 页码：47-62
• 文件大小：550 K

摘要

The halo nucleus p>6p>He has been studied in a pionic fusion experiment at the CELSIUS ring in Uppsala. The aim of the experiment was to investigate, in particular, the high-momentum part of the halo wave function by measuring the differential cross section for the p>4p>He(d, p>6p>He)me="mml1">method=retrieve&_udi=B6TVB-4KYY4GC-3&_mathId=mml1&_user=10&_cdi=5530&_rdoc=4&_handle=V-WA-A-W-AD-MsSAYZW-UUA-U-AAZCWEZAYU-AAZWYDZEYU-VBWWVEUE-AD-U&_acct=C000050221&_version=1&_userid=10&md5=b87d7d15dbe396838e0291fde4a33102" title="Click to view the MathML source">πp>+p> reaction 0.6, 1.2 and 5.0 MeV above threshold in the centre-of-mass frame. The p>6p>He ions were detected in a me="mml2">method=retrieve&_udi=B6TVB-4KYY4GC-3&_mathId=mml2&_user=10&_cdi=5530&_rdoc=4&_handle=V-WA-A-W-AD-MsSAYZW-UUA-U-AAZCWEZAYU-AAZWYDZEYU-VBWWVEUE-AD-U&_acct=C000050221&_version=1&_userid=10&md5=e49d386549cfcf44e394d82bfd2f97aa" title="Click to view the MathML source">ΔE−E solid-state detector telescope inserted into the ring vacuum. The result for the total cross section is, respectively, 22(1), 38(1) and 57(9) nb with a common systematic uncertainty of me="mml3">method=retrieve&_udi=B6TVB-4KYY4GC-3&_mathId=mml3&_user=10&_cdi=5530&_rdoc=4&_handle=V-WA-A-W-AD-MsSAYZW-UUA-U-AAZCWEZAYU-AAZWYDZEYU-VBWWVEUE-AD-U&_acct=C000050221&_version=1&_userid=10&md5=13453474c2eecd15bf8685969d4435a5" title="Click to view the MathML source">±35%. The differential cross section is clearly anisotropic: me="mml4">, me="mml5">method=retrieve&_udi=B6TVB-4KYY4GC-3&_mathId=mml5&_user=10&_cdi=5530&_rdoc=4&_handle=V-WA-A-W-AD-MsSAYZW-UUA-U-AAZCWEZAYU-AAZWYDZEYU-VBWWVEUE-AD-U&_acct=C000050221&_version=1&_userid=10&md5=2a00eddb19e442fcdb4d83e5733f99e6" title="Click to view the MathML source">−0.29(5) and me="mml6">method=retrieve&_udi=B6TVB-4KYY4GC-3&_mathId=mml6&_user=10&_cdi=5530&_rdoc=4&_handle=V-WA-A-W-AD-MsSAYZW-UUA-U-AAZCWEZAYU-AAZWYDZEYU-VBWWVEUE-AD-U&_acct=C000050221&_version=1&_userid=10&md5=3f3b796afce9cf5304ac95ba3f027d6c" title="Click to view the MathML source">−0.35(15) at the same three energies. The preferred direction of emission for the pion is parallel to the momentum of the p>4p>He ion in the initial state. In terms of a simple model for the reaction the results depend sensitively on the state of motion of the centre of mass of the halo relative to that of the core.