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The (Li-6,Li-6*[3.56 MeV]) reaction at 100 MeV/u as a probe of Gamow-Teller transition strengths in the inelastic scattering channel

文献类型:期刊论文

作者Sullivan, C.1,2,3; Zegers, R. G. T.1,2,3; Noji, S.1; Austin, Sam M.1,3; Schmitt, J.1,2; Aoi, N.4; Bazin, D.1,2; Carpenter, M.5; Carroll, J. J.6; Fujita, H.4
刊名PHYSICAL REVIEW C
出版日期2018-07-31
卷号98期号:1页码:10
ISSN号2469-9985
DOI10.1103/PhysRevC.98.015804
通讯作者Zegers, R. G. T.(zegers@nscl.msu.edu)
英文摘要Background: Inelastic neutrino-nucleus scattering is important for understanding core-collapse supernovae and the detection of emitted neutrinos from such events in earth-based detectors. Direct measurement of the cross sections is difficult and has only been performed on a few nuclei. It is, therefore, important to develop indirect techniques from which the inelastic neutrino-nucleus scattering cross sections can be determined. Purpose: This paper presents a development of the (Li-6,Li-6*[T = 1, T-z = 0, 0(+), 3.56 MeV]) reaction at 100 MeV/u as a probe for isolating the isovector spin-transfer response in the inelastic channel (Delta S = 1, Delta T = 1, Delta T-z = 0) from which the Gamow-Teller transition strengths from nuclei of relevance for inelastic neutrino-nucleus scattering cross sections can be extracted. Method: By measuring the Li-6 ejectile in a magnetic spectrometer and selecting events in which the 3.56 MeV gamma ray from the decay of the Li-6*[3.56 MeV] state is detected, the isovector spin-transfer selectivity is obtained. High-purity germanium clover detectors served to detect the gamma rays. Doppler reconstruction was used to determine the gamma energy in the rest frame of Li-6. From the Li-6 and 3.56 MeV gamma-momentum vectors the excitation energy of the residual nucleus was determined. Results: In the study of the C-12(Li-6,Li-6*[3.56 MeV]) reaction, the isovector spin-transfer excitation-energy spectrum in the inelastic channel was successfully measured. The strong Gamow-Teller state in C-12 at 15.1 MeV was observed. Comparisons with the analog C-12(Li-6,He-6) reaction validate the method of extracting the Gamow-Teller strength. In measurements of the Mg-24, Nb-93(Li-6,Li-6*[3.56 MeV]) reactions, the 3.56 MeV gamma peak could not be isolated from the strong background in the gamma spectrum from the decay of the isoscalar excitations. It is argued that by using a gamma-ray tracking array instead of a clover array, it is feasible to extend the mass range over which the (Li-6,Li-6*) reaction can be used for extracting the isovector spin-transfer response up to mass numbers of similar to 25 and perhaps higher. Conclusions: It is demonstrated that the (Li-6,Li-6*[3.56 MeV]) reaction probe can be used to isolate the inelastic isovector spin-transfer response in nuclei. Application to nuclei with mass numbers of about 25 or more, however, will require a more efficient gamma-ray array with a better tracking capability.
收录类别SCI
WOS关键词R-PROCESS ; INTERMEDIATE ENERGIES ; NEUTRINO SCATTERING ; HE-6 REACTION ; SPIN PROBES ; NUCLEI ; LI-6 ; SUPERNOVA ; DECAY ; EXCITATIONS
WOS研究方向Physics
WOS类目Physics, Nuclear
语种英语
出版者AMER PHYSICAL SOC
WOS记录号WOS:000440384600007
URI标识http://www.irgrid.ac.cn/handle/1471x/2557793
专题寒区旱区环境与工程研究所
通讯作者Zegers, R. G. T.
作者单位1.Michigan State Univ, Natl Superconducting Cyclotron Lab, E Lansing, MI 48824 USA
2.Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA
3.Michigan State Univ, Joint Inst Nucl Astrophys, Ctr Evolut Elements, E Lansing, MI 48824 USA
4.Osaka Univ, RCNP, Ibaraki, Osaka 5670047, Japan
5.Argonne Natl Lab, Argonne, IL 60439 USA
6.US Army Res Lab, 2800 Powder Mill Rd, Adelphi, MD 20783 USA
7.Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA
8.Swarthmore Coll, Dept Phys & Astron, Swarthmore, PA 19081 USA
9.Univ Groningen, KVI CART, NL-9747 AA Groningen, Netherlands
10.Tohoku Univ, Dept Phys, Sendai, Miyagi 9808578, Japan
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Sullivan, C.,Zegers, R. G. T.,Noji, S.,et al. The (Li-6,Li-6*[3.56 MeV]) reaction at 100 MeV/u as a probe of Gamow-Teller transition strengths in the inelastic scattering channel[J]. PHYSICAL REVIEW C,2018,98(1):10.
APA Sullivan, C..,Zegers, R. G. T..,Noji, S..,Austin, Sam M..,Schmitt, J..,...&Zhou, X..(2018).The (Li-6,Li-6*[3.56 MeV]) reaction at 100 MeV/u as a probe of Gamow-Teller transition strengths in the inelastic scattering channel.PHYSICAL REVIEW C,98(1),10.
MLA Sullivan, C.,et al."The (Li-6,Li-6*[3.56 MeV]) reaction at 100 MeV/u as a probe of Gamow-Teller transition strengths in the inelastic scattering channel".PHYSICAL REVIEW C 98.1(2018):10.

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