Spin observables in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi><mml:mrow><mml:mrow><mml:mover><mml:mrow><mml:mi>n</mml:mi></mml:mrow><mml:mrow><mml:mo>→</mml:mo></mml:mrow></mml:mover></mml:mrow></mml:mrow><mml:mi>p</mml:mi><mml:mi>Λ</mml:mi></mml:math>reaction

Nabetani, H.; Ogaito, Tatoku; Satô, Tôru; Kishimoto, T.

doi:10.1103/physrevc.60.017001

Cited by 19 publications

(18 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is important to emphasize that Eq. (43) is only an approximation, that can be adapted from the corresponding expression for the two-body reaction pn → p in free space [22]. As such, it ignores the fact that the final state of nonmesonic decay is a three-body one and the ensuing kinematical complications should be properly dealt with, which requires a direct integration over the available phase space as done in the expressions used here.…”

Section: Shown Inmentioning

confidence: 99%

Asymmetry parameter for nonmesonic hypernuclear decay

2005

View full text Add to dashboard Cite

We give general expressions for the vector asymmetry in the angular distribution of protons in the nonmesonic weak decay of polarized hypernuclei. From these we derive an explicit expression for the calculation of the asymmetry parameter, a , which is applicable to the specific cases of 5 He and 12 C described within the extreme shell model. In contrast to the approximate formula widely used in the literature, it includes the effects of three-body kinematics in the final states of the decay and correctly treats the contribution of transitions originating from single-proton states beyond the s-shell. This expression is then used for the corresponding numerical computation of a within several one-meson-exchange models. Besides the strictly local approximation usually adopted for the transition potential, we also consider the addition of the first-order nonlocality terms. We find values for a ranging from −0.62 to −0.24, in qualitative agreement with other theoretical estimates but in contradiction with some recent experimental determinations.

show abstract

Section: Shown Inmentioning

confidence: 99%

Asymmetry parameter for nonmesonic hypernuclear decay

2005

View full text Add to dashboard Cite

show abstract

“…8 is adapted form the corresponding expression derived for the two-body reaction pn → pΛ in free space [8]. In actual fact, however, the fi nal state of the hypernuclear decay is a three-body one, and the ensuing kinematical complications should be properly dealt with, which requires a direct integration over the available phase space in order to compute A V from the exact expressions in Eqs.…”

Section: Hypernuclear Asymmetrymentioning

confidence: 99%

Asymmetry parameter for the nonmesonic decay of 5<FONT FACE=Symbol>L</font>He

Barbero¹,

Galeão²,

Krmpotić³

2004

Braz. J. Phys.

View full text Add to dashboard Cite

We report the preliminary result of an exact calculation of the asymmetry parameter, aΛ, in the nonmesonic hypernuclear decay, based on a one-meson-exchange (OME) model. For the case of 5 Λ He and including onepion-exchange only, the result is shown not to differ considerably from the one obtained with the approximate formula widely used in the literature. In particular, the sign of aΛ remains negative, in disagreement with its most recent experimental determination. Whether these facts remain true for heavier hypernuclei and in a more complete OME model is still under investigation.

show abstract

“…The asymmetry parameter comes from interference between the PC and PV amplitudes that have different final isospins, since the exchange of a proton and a neutron is related to both the parity and isospin. Recently, explicit formulas of the asymmetry parameter have been given for the s-wave Lp initial state [13]. Here are the following terms: ae, b͑c 2…”

mentioning

confidence: 99%

Asymmetry in the Nonmesonic Weak Decay of PolarizedΛ5HeHypernuclei

et al. 2000

Self Cite

View full text Add to dashboard Cite

We have measured the asymmetric emission of protons from the nonmesonic decay of polarized (5)(Lambda)He produced by the (pi(+), K+) reaction. (5)(Lambda)He is an s-shell hypernucleus and its polarization is due to the Lambda. One expects to obtain direct information on the elementary weak Lambda-->p-->np process. The asymmetry parameter has been determined to be 0.24+/-0.22. The implication of the result is discussed.

show abstract

Spin observables in thepn→pΛreaction

Cited by 19 publications

References 16 publications

Asymmetry parameter for nonmesonic hypernuclear decay

Asymmetry parameter for nonmesonic hypernuclear decay

Asymmetry parameter for the nonmesonic decay of 5<FONT FACE=Symbol>L</font>He

Asymmetry in the Nonmesonic Weak Decay of PolarizedΛ5HeHypernuclei

Contact Info

Product

Resources

About