Acta Physica Hungarica最新文献_第5页

Is nuclear structure relevant to non-mesonic hypernuclear weak decay? 核结构与非介子超核弱衰变有关吗?

Acta Physica Hungarica Pub Date : 2002-03-01 DOI: 10.1556/APH.16.2002.1-4.37

H. C. Wu, M. Aristizábal, W. Ponce

引用次数: 0

Λ0 polarization in ultrarelativistic nucleus-nucleus collisions Λ0超相对论性核-核碰撞中的极化

Acta Physica Hungarica Pub Date : 2002-03-01 DOI: 10.1556/APH.16.2002.1-4.16

A. Ayala, E. Cuautle, Luis Manuel Monta o, G. Herrera

引用次数: 0

Spin Transfer Measurements in $(vec{p},vec{n})$ Reactions $(vec{p}，vec{n})$反应中的自旋转移测量

Acta Physica Hungarica Pub Date : 2002-03-01 DOI: 10.1556/aph.16.2002.1-4.12

J. Rapaport

{"title":"Spin Transfer Measurements in $(vec{p},vec{n})$ Reactions","authors":"J. Rapaport","doi":"10.1556/aph.16.2002.1-4.12","DOIUrl":"https://doi.org/10.1556/aph.16.2002.1-4.12","url":null,"abstract":"The measurement of complete sets of spin transfer coefficients in nuclear transitions, induced via charge-exchange (((vec p, vec n))) reactions at intermediate energies, is a unique form of separating the spin-dependent and spin-independent contributions to the differential cross section. The two components of the spin-dependent contribution, the spin-longitudinal and spin-transverse components may equally be separated. This is extremely important in cases where the target nuclei has a non-integer ground state spin. In this study and as an example of the above, we present differential cross section and complete set of polarization transfer coefficients obtained in the ((^{13} C(vec p, vec n))) 13N reaction studied at angles between 0° and 33° and at 197 MeV incident proton energy. Polarization transfer coefficients are used to obtain the fraction of the Gamow-Teller (GT) component in the mirror ground state transition, which is a combination of the spin-independent Fermi (F) and spin-dependent GT components. Data are also presented for the transition to the first excited state in 13N at 2.34 MeV. This is a (1/2)− → (1/2)+ transition and the cross section is an incoherent admixture of ΔJ π = 1− and ΔJ π = 0− components. The complete set of polarization transfer coefficients are used to obtain differential cross section data for both components. The empirical results are compared with Distorted Wave Impulse Approximation calculations, DWIA.","PeriodicalId":7004,"journal":{"name":"Acta Physica Hungarica","volume":"4 1","pages":"105-111"},"PeriodicalIF":0.0,"publicationDate":"2002-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76309777","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Searching for gluonic excitations —The Hall D project at Jlab 寻找胶子激发态- Jlab的D厅项目

Acta Physica Hungarica Pub Date : 2002-03-01 DOI: 10.1556/APH.16.2002.1-4.21

E. Smith

引用次数: 0

Enhancement of pionic modes in the quasielastic region 准弹性区域中子模式的增强

Acta Physica Hungarica Pub Date : 2002-03-01 DOI: 10.1556/APH.16.2002.1-4.6

M. Ichimura, K. Kawahigashi

引用次数: 1

Barrett moments and rms charge radii 巴雷特力矩和均方根电荷半径

Acta Physica Hungarica Pub Date : 2002-01-01 DOI: 10.1556/APH.15.2002.1-2.4

I. Angeli

引用次数: 3

The percolation mechanism for fragmentation of nuclei using Monte Carlo technique 利用蒙特卡罗技术研究核破碎的渗透机制

Acta Physica Hungarica Pub Date : 2002-01-01 DOI: 10.1556/APH.15.2002.1-2.8

A. El-Naghy, M. Mohery, K. Gad

引用次数: 2

Directed flow of baryons from high-energy heavy-ion collisions 高能重离子碰撞中重子的定向流动

Acta Physica Hungarica Pub Date : 2002-01-01 DOI: 10.1556/APH.15.2002.1-2.6

W. Nörenberg, E. Nikonov, Y. Ivanov

引用次数: 3

Comparative study for nucleus-nucleus interactions and modified cascade evaporation model at (4.1 – 4.5) AGeV/c (4.1 ~ 4.5) AGeV/c下核-核相互作用与改进级联蒸发模型的比较研究

Acta Physica Hungarica Pub Date : 2001-08-01 DOI: 10.1556/APH.15.2002.1-2.7

A. E. Naghy, S. Abdel-Aziz, S. Abou-Steit

{"title":"Comparative study for nucleus-nucleus interactions and modified cascade evaporation model at (4.1 – 4.5) AGeV/c","authors":"A. E. Naghy, S. Abdel-Aziz, S. Abou-Steit","doi":"10.1556/APH.15.2002.1-2.7","DOIUrl":"https://doi.org/10.1556/APH.15.2002.1-2.7","url":null,"abstract":"The characteristics of the nucleus-nucleus collisions at high energy for the interactions of 1H, 4He, 12C, 16O, 22Ne, 28Si and 32S with emulsion at momentum (4.1 – 4.5) AGeV/c have been investigated. It has been found that the multiplicity distributions of the different emitted particles and their average values can be described by the modified cascade evaporation model. The model reproduces satisfactorily the multiplicity distributions of the shower, grey and black particles and the correlations between their multiplicities. It has been seen that the number of the produced shower particles increases with the increase of the projectile mass number. From the correlation between the average multiplicity of the evaporation particles and the number of the produced particles, it was found that a phase transition in the target system may occur. The calculated pseudo-rapidity distributions of the produced shower particles are typically Gaussian shaped in the mid-rapidity region and agree well with the experimental data. Also, the angular distributions of the grey and black particles have been investigated. The angular distributions of the grey particles show a universal shape independent of the type of projectile. The angular distributions of the black particles are nearly isotropic with a small asymmetry in the forward direction. The modified cascade evaporation model, reproduces the general characteristics of the nucleus-nucleus interactions and gives an explanation for the multiparticle production process.","PeriodicalId":7004,"journal":{"name":"Acta Physica Hungarica","volume":"94 1","pages":"131-153"},"PeriodicalIF":0.0,"publicationDate":"2001-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90335066","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

KeV astrophysics with GeV beams; blazing a new trail on the summit of Nuclear Astrophysics GeV光束的KeV天体物理学;在核天体物理学的顶峰上开辟了一条新路

Acta Physica Hungarica Pub Date : 2001-07-12 DOI: 10.1556/APH.15.2002.3-4.21

M. Gai

{"title":"KeV astrophysics with GeV beams; blazing a new trail on the summit of Nuclear Astrophysics","authors":"M. Gai","doi":"10.1556/APH.15.2002.3-4.21","DOIUrl":"https://doi.org/10.1556/APH.15.2002.3-4.21","url":null,"abstract":"GeV beams of light ions and electrons are used for creating a high flux of real and virtual photons, with which some problems in Nuclear Astrophysics are studied. GeV 8B beams are used to study the Coulomb dissociation of 8B and thus the 7Be(p,γ)8B reaction. This reaction is one of the major source of uncertainties in estimating the 8B solar neutrino flux and a critical input for calculating the 8B solar neutrino flux. The Coulomb dissociation of 8B appears to provide a viable method for measuring the 7Be(p,γ)8B reaction rate, with a weighted average of the RIKEN1, RIKEN2, GSI1 and MSU published results of S 17(0)=18.9±1.0 eV-b. This result, however, does not include a theoretical error estimated to be ±10%. GeV electron beams on the other hand, are used to create a high flux of real and virtual photons at TUNL-HIGS and MIT-Bates, respectively, and we discuss two new proposals to study the 12C(α,γ)16O reaction with real and virtual photons. The 12C(α,γ)16O reaction is essential for understanding Type II and Type Ia supernova. It is concluded that virtual and real photons produced by GeV light ions and electron beams are useful for studying some problems in Nuclear Astrophysics.","PeriodicalId":7004,"journal":{"name":"Acta Physica Hungarica","volume":"3 1","pages":"391-400"},"PeriodicalIF":0.0,"publicationDate":"2001-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89219020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0