The inelastic excitations and cluster decay of ^(13)C have been measured using the reaction,9Be(^(13)C, ^(13)C* →~9Be + α)~9Be. We observe strong excitation to the 14.3-MeV(1/2-) resonant state from the cluster-deca...The inelastic excitations and cluster decay of ^(13)C have been measured using the reaction,9Be(^(13)C, ^(13)C* →~9Be + α)~9Be. We observe strong excitation to the 14.3-MeV(1/2-) resonant state from the cluster-decay channel, leading to an enhanced monopole matrix element of(6.3 ± 0.6) fm^2. This large cluster-related monopole strength is a clear indication of the cluster-structure domination of this state and is consistent with the recent prediction of the orthogonality condition model(OCM). It would be interesting to further explore the three-center molecular rotational band that is initiated from the observed band-head.展开更多
This study aims to analyze the differential cross sections （DCSs） of elastic scattering and total reaction cross sections （TRCSs） of the loosely-bound deuteron projectile impinging on lp-shell nuclei, such as 9Be,...This study aims to analyze the differential cross sections （DCSs） of elastic scattering and total reaction cross sections （TRCSs） of the loosely-bound deuteron projectile impinging on lp-shell nuclei, such as 9Be, 12C, and 160, at incident energies ranging between 10.6 and 171 MeV using the continuum discretized coupled channel （CDCC） method. By fitting the experimental data for the DCSs and TRCSs, energy-dependent renormalization factors for the real and imaginary parts of the nucleon-nucleus optical-model potentials deduced from the studies proposed by Koning and Delaroche （KD02） and by Watson, Singh, and Segel （WSS）, are obtained. It is found that with the WSS potential, which was obtained specifically for lp-shell nuclei, the CDCC calculations can simultaneously reproduce both the DCSs and the TRCSs. The results show that it is important to choose appropriate optical potentials to describe deuteron-induced reactions.展开更多
The ＂island of inversion＂ has been known for over a quar- ter century, since Warburton et al. [1] proposed that nuclei with intruder ground states would constitute a 3x3 square with Z=10-12, N=20-22 in 1990. Uncover...The ＂island of inversion＂ has been known for over a quar- ter century, since Warburton et al. [1] proposed that nuclei with intruder ground states would constitute a 3x3 square with Z=10-12, N=20-22 in 1990. Uncovering the underlying inversion mechanism and exploring the scope of the island have attracted significant theoretical and experimental efforts in the following years. Now it is well known that the reduction of N=20 shell gap, which is likely caused by the strong nucleon-nucleon tensor interaction [2-5], allows the intrusion of neutron orbits from the pf shell into the sd shell and results in the inversion of the 2p-2h intruder and 0p-0h normal con- figurations of the nuclear ground states in this region. Mean- while, the original border of the ＂island of inversion＂ has been extended greatly [6-14].展开更多
A transfer-reaction experiment of ~9Be(~9Be,^(10)Be)~8Be was performed at a beam energy of 45 Me V.Excited states in ^(10)Be up to 18.80 Me V are produced using missing mass and invariant mass methods.Most of the obse...A transfer-reaction experiment of ~9Be(~9Be,^(10)Be)~8Be was performed at a beam energy of 45 Me V.Excited states in ^(10)Be up to 18.80 Me V are produced using missing mass and invariant mass methods.Most of the observed high-lying resonant states,reconstructed from theα+~6He and t+~7Li decay channels,agree with the previously reported results.In addition,two new resonances at 15.6 and 18.8 Me V are identified from the present measurement.The 18.55 Me V state is found to decay into both the t + ~7Lig:s: and t + ~7Li?(0.478 MeV) channels, with a relative branching ratio of 0:93 ± 0:33. Further theoretical investigations are encouraged to interpret this new information on cluster structure in neutron-rich light nuclei.展开更多
Errors were introduced during the typesetting process by the Editorial Office.We sincerely apologize to the authors and our readers for this oversight.The corrections are as follows:1.Author ORCIDs:The following ORCID...Errors were introduced during the typesetting process by the Editorial Office.We sincerely apologize to the authors and our readers for this oversight.The corrections are as follows:1.Author ORCIDs:The following ORCIDs have been added to the author list:Yangfan Guo:https://orcid.org/0009-0009-1817-7959 Shaojie Chen:https://orcid.org/0009-0005-1235-2411 Wencong Mei:https://orcid.org/0009-0009-7635-6998 Hanrui Hu:https://orcid.org/0009-0006-7760-3338 Dongyang Chen:https://orcid.org/0000-0001-6264-060X 2.Abstract:The phrase"to access"has been corrected to"by accessing".3.Page 2,Line 3 in left column:The sentence"The CLS system was expected to exhibit limited experimental efficiency"has been corrected to"The CLS system exhibited limited experimental efficiency as expected".4.Page 3,Line 19 in left column:the$symbol should be removed.展开更多
To study the nuclear properties and deformation of neutron-rich cesium isotopes in their ground and isomeric states at the Beijing Rare Isotope Beam Facility(BRIF),optimal resonance ionization schemes and experimental...To study the nuclear properties and deformation of neutron-rich cesium isotopes in their ground and isomeric states at the Beijing Rare Isotope Beam Facility(BRIF),optimal resonance ionization schemes and experimental conditions must be predetermined.In this study,we evaluated several three-step laser resonance ionization schemes for cesium atoms by accessing their ionization efficiency and spectral resolution under varying measurement conditions using high-resolution and high-sensitivity collinear resonance ionization spectroscopy system.Hence,we identified the currently most efficient resonance ionization scheme and optimal experimental conditions,achieving an overall measurement efficiency of 1:400 with a spectral resolution of about 100 MHz.Under this condition,the extracted hyperfine structure parameters of 133Cs showed excellent agreement with previously reported values.This study establishes a solid foundation for the forthcoming online measurement of neutron-rich cesium isotopes at BRIF.展开更多
基金the National Key Research and Development Program of China(2018YFA0404403 and 2022YFA1602302)the National Natural Science Foundation of China(11875074,11875073,12235020,12027809,11961141003,U1967201,U2167204,11775004,and 11775003)+2 种基金the Continuous Basic Scientific Research Project(WDJC-2019–13)the State Key Laboratory of Nuclear Physics and Technology,Peking University(NPT2020KFY10)the Leading Innovation Project(LC192209000701 and LC202309000201)。
基金supported by the National Key R&D Program of China(Grant No.2018YFA0404403)the National Natural Science Foundation of China(Grant Nos.11535004,11775004,11775013,11775316,and11405005)
文摘The inelastic excitations and cluster decay of ^(13)C have been measured using the reaction,9Be(^(13)C, ^(13)C* →~9Be + α)~9Be. We observe strong excitation to the 14.3-MeV(1/2-) resonant state from the cluster-decay channel, leading to an enhanced monopole matrix element of(6.3 ± 0.6) fm^2. This large cluster-related monopole strength is a clear indication of the cluster-structure domination of this state and is consistent with the recent prediction of the orthogonality condition model(OCM). It would be interesting to further explore the three-center molecular rotational band that is initiated from the observed band-head.
基金supported by the National Key R&D Program of China(Grant No.2018YFA0404403)the National Natural Science Foundation of China(Grant Nos.11775004,and 11775036)
文摘This study aims to analyze the differential cross sections （DCSs） of elastic scattering and total reaction cross sections （TRCSs） of the loosely-bound deuteron projectile impinging on lp-shell nuclei, such as 9Be, 12C, and 160, at incident energies ranging between 10.6 and 171 MeV using the continuum discretized coupled channel （CDCC） method. By fitting the experimental data for the DCSs and TRCSs, energy-dependent renormalization factors for the real and imaginary parts of the nucleon-nucleus optical-model potentials deduced from the studies proposed by Koning and Delaroche （KD02） and by Watson, Singh, and Segel （WSS）, are obtained. It is found that with the WSS potential, which was obtained specifically for lp-shell nuclei, the CDCC calculations can simultaneously reproduce both the DCSs and the TRCSs. The results show that it is important to choose appropriate optical potentials to describe deuteron-induced reactions.
基金supported by the National Natural Science Foundation of China(Grant Nos.11575006,11675003,11375017,11235001,11335002, 11375015,11320101004,and 11461141002)the China Postdoctoral Science Foundation(Grant Nos.2015M580007,and 2016T90007)the Chinese Major State Basic Research Development Program(Grant No.2013CB834400)
文摘The ＂island of inversion＂ has been known for over a quar- ter century, since Warburton et al. [1] proposed that nuclei with intruder ground states would constitute a 3x3 square with Z=10-12, N=20-22 in 1990. Uncovering the underlying inversion mechanism and exploring the scope of the island have attracted significant theoretical and experimental efforts in the following years. Now it is well known that the reduction of N=20 shell gap, which is likely caused by the strong nucleon-nucleon tensor interaction [2-5], allows the intrusion of neutron orbits from the pf shell into the sd shell and results in the inversion of the 2p-2h intruder and 0p-0h normal con- figurations of the nuclear ground states in this region. Mean- while, the original border of the ＂island of inversion＂ has been extended greatly [6-14].
基金supported by the National Basic Research Program of China (Grant No. 2013CB834402)the National Natural Science Foundation of China (Grant Nos. 11535004, 11275011, 11375017, and 11275001)
文摘A transfer-reaction experiment of ~9Be(~9Be,^(10)Be)~8Be was performed at a beam energy of 45 Me V.Excited states in ^(10)Be up to 18.80 Me V are produced using missing mass and invariant mass methods.Most of the observed high-lying resonant states,reconstructed from theα+~6He and t+~7Li decay channels,agree with the previously reported results.In addition,two new resonances at 15.6 and 18.8 Me V are identified from the present measurement.The 18.55 Me V state is found to decay into both the t + ~7Lig:s: and t + ~7Li?(0.478 MeV) channels, with a relative branching ratio of 0:93 ± 0:33. Further theoretical investigations are encouraged to interpret this new information on cluster structure in neutron-rich light nuclei.
基金National Key R&D Program of China(2023YFE0101600,2023YFA1606403,2022YFA1605100)National Natural Science Foundation of China(12027809,12350007)。
文摘Errors were introduced during the typesetting process by the Editorial Office.We sincerely apologize to the authors and our readers for this oversight.The corrections are as follows:1.Author ORCIDs:The following ORCIDs have been added to the author list:Yangfan Guo:https://orcid.org/0009-0009-1817-7959 Shaojie Chen:https://orcid.org/0009-0005-1235-2411 Wencong Mei:https://orcid.org/0009-0009-7635-6998 Hanrui Hu:https://orcid.org/0009-0006-7760-3338 Dongyang Chen:https://orcid.org/0000-0001-6264-060X 2.Abstract:The phrase"to access"has been corrected to"by accessing".3.Page 2,Line 3 in left column:The sentence"The CLS system was expected to exhibit limited experimental efficiency"has been corrected to"The CLS system exhibited limited experimental efficiency as expected".4.Page 3,Line 19 in left column:the$symbol should be removed.
基金National Key R&D Program of China(2023YFE0101600,2023YFA1606403,2022YFA 1605100)National Natural Science Foundation of China(12027809,12350007)。
文摘To study the nuclear properties and deformation of neutron-rich cesium isotopes in their ground and isomeric states at the Beijing Rare Isotope Beam Facility(BRIF),optimal resonance ionization schemes and experimental conditions must be predetermined.In this study,we evaluated several three-step laser resonance ionization schemes for cesium atoms by accessing their ionization efficiency and spectral resolution under varying measurement conditions using high-resolution and high-sensitivity collinear resonance ionization spectroscopy system.Hence,we identified the currently most efficient resonance ionization scheme and optimal experimental conditions,achieving an overall measurement efficiency of 1:400 with a spectral resolution of about 100 MHz.Under this condition,the extracted hyperfine structure parameters of 133Cs showed excellent agreement with previously reported values.This study establishes a solid foundation for the forthcoming online measurement of neutron-rich cesium isotopes at BRIF.
