共查询到20条相似文献,搜索用时 15 毫秒
1.
Mohammad R. Ahmady Roberto R. Mendel 《Zeitschrift fur Physik C Particles and Fields》1995,65(2):263-265
The decay rates for the exclusiveB decaysBK
c
andBK*
c
are calculated in the context of the heavy quark effective theory. We obtain(BK
c
)/ (BK)=1.6±0.2 and(BK*
c
)/ (K*)=0.39±0.04. These results lead to estimates BR(BK
c
)=(0.11±0.02)% and BR(BK*
c
)=(0.05±0.01)% if we use the central current experimental values forB(K, K
*) branching ratios. 相似文献
2.
Nikolai N. Nikolaev Vladimir R. Zoller 《Zeitschrift fur Physik C Particles and Fields》1992,56(4):623-628
One expects a similarity of the energy dependence of the difference
tot(*p)–
tot(*n) for virtual (deep inelastic scatteringQ
2m
2) and real (Q
2=0) photons. Previous analysis of D structure functions with allowence for nuclear shadowing (NS) in the deuteron has led to conclusion that
tot(*p)–
tot(*n)<0>0>x<0.015. the=" early=" evidence=" from=" the=" real=" photoproduction=" data=">0.015.>
tot(p)–
tot(n)<0. we=" critically=" reexamine=" determinations=" of=" the=">0.>
tot(p)–
tot(n), using more accurate calculations of NS correction to
tot(D), and discuss a possibility of
tot(n)
tot(p) at moderately high energies. 相似文献
3.
M. Liang H. Ohm B. De Sutter-Pommé K. Sistemich 《Zeitschrift für Physik A Hadrons and Nuclei》1995,351(1):13-18
The half-lives of seven levels in105Mo have been determined with high precision at the fission-product separator Josef. The-- triple coincidence method with plastic and BaF2 scintillators was used for a determination of the time between the
q feeding of a level of interest and its depopulation. A value of
q
=0.38 (1) for the deformation parameter has been deduced from the half-lives of the first and second excited states. The results of Particle-Rotor model-calculations with the Nilsson parameters=0.084 and=0.28 support the assignment of the Nilsson orbital [532] 5/2– to the ground state of105Mo.The authors acknowledge with pleasure fruitful discussions with Profs. W.R. Phillips, I. Ragnarsson and O.W.B. Schult. 相似文献
4.
E. Scheidemann R. Eder E. Hagn E. Zech 《Zeitschrift für Physik A Hadrons and Nuclei》1991,340(3):235-239
A mini transmission-ray Compton polarimeter was developed for the measurement of the sign of magnetic moments of radioactive nuclei with low-temperature nuclear orientation. The signs of the magnetic moments of the following isotopes were determined:193Os [=+0.7297(16)
N];191m
Ir [=+6.20(9)
N];192Ir [=+1.924(10)
N];194Ir [=+0.39(1)
N];195m
Pt [=–0.605(15)
N].Dedicated to Prof. Dr. P. Kienle on the occasion of his 60th birthday 相似文献
5.
We analyzeK decays in the framework of Chiral Perturbation Theory. We study the different Dalitz plot distributions, trying to find regions whereo(p
6) contributions could be more easily detected. To fulfill this program we compute all theo(p
4) loop and counterterm contributions, finding a substantial agreement with the existing calculations and adding some small missing terms inK
S
+–.Work supported in part by the Human Capital and Mobility Program, EEC Contract N. CHRX-CT920026 相似文献
6.
S. B. Shlosman 《Communications in Mathematical Physics》1989,125(1):81-90
We consider the 2-dimensional Ising model with ferromagnetic nearest neighbour interaction at inverse temperature. LetS
N
=
t
be the total magnetization inside anN×N square box,
per
be the Gibbs state in with periodic b.c., andm() be the spontaneous magnetization. We show the existence of the limit
相似文献
7.
On the basis of the approximate vanishing of the singlet axial charge of the nucleon, it is argued that
1 should decouple from all hadrons constructed out of the constituentu, d ors quarks in theU(3)
L
×U(3)
R
chiral limit for largeN
c
. Furthermore
1 should dominate the processesJ/, . A phenomenological analysis of the and couplings to many hadronic states is consistent with these results. 相似文献
8.
Maria Hoffmann-Ostenhof Thomas Hoffmann-Ostenhof 《Communications in Mathematical Physics》1988,117(1):49-77
Let
R
=
n
B
R, wheren3 andB
R={x
n
:|x|R}. We investigate the asymptotics of real valued solutions L
2(
R
) of the Schrödinger equation (–+V–E)=0, whereE<0>0>V(x)0 for |x|: LetD denote an unbounded nodal domain of (i.e. a component of
R
{x:(x)=0}), and letS(r)={yS
n–1:ryD} withS
n–1 the unit sphere in
n
. Under suitable assumptions onV it is shown that for some >0,
|