Parreño García, Assumpta
Overview
Works:  4 works in 11 publications in 2 languages and 10 library holdings 

Roles:  Author 
Publication Timeline
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Most widely held works by
Assumpta Parreño García
The nonmesonic weak decay of hypernuclei by
Assumpta Parreño Garcia(
Book
)
5 editions published in 1997 in English and Spanish and held by 4 WorldCat member libraries worldwide
5 editions published in 1997 in English and Spanish and held by 4 WorldCat member libraries worldwide
Nonmesonic weak decay of hypernuclei in effective field theory by Axel PérezObiol Castañeda(
)
3 editions published in 2014 in English and held by 3 WorldCat member libraries worldwide
In this thesis we have described the weak Lambda N to NN interaction, which is the main responsible for the decay of heavy hypernuclei, within the effective field theory (EFT) framework. The EFT is developed up to second order in "q", where "q" is the transferred momentum between the interacting baryons. In particular, all the twopion exchange diagrams entering at second order in the momentum expansion have been calculated. Numerical values for the leading order lowenergy constants are obtained by two means. First, a fit to the hypernuclear decay observables for three light hypernuclei, 5Lambda/He, 11lLambda/B i 12/Lambda/C, has been performed. This calculation has involved a proper description of the initial and final nuclear states within a manybody formalism. Second, the EFT has been compared to the onemesonexchange model describing the same interaction. By expanding the onemesonexchange potentials in powers of momentum, the low energy constants appearing in the EFT description have been written in terms of the heavy meson parameters. In order to obtain a less model dependent description of the weak decay of hypernuclei we have studied the decay of the lightest hypernucleus, the hypertriton, which can be described within an effective field theory framework in both the strong and the weak sectors
3 editions published in 2014 in English and held by 3 WorldCat member libraries worldwide
In this thesis we have described the weak Lambda N to NN interaction, which is the main responsible for the decay of heavy hypernuclei, within the effective field theory (EFT) framework. The EFT is developed up to second order in "q", where "q" is the transferred momentum between the interacting baryons. In particular, all the twopion exchange diagrams entering at second order in the momentum expansion have been calculated. Numerical values for the leading order lowenergy constants are obtained by two means. First, a fit to the hypernuclear decay observables for three light hypernuclei, 5Lambda/He, 11lLambda/B i 12/Lambda/C, has been performed. This calculation has involved a proper description of the initial and final nuclear states within a manybody formalism. Second, the EFT has been compared to the onemesonexchange model describing the same interaction. By expanding the onemesonexchange potentials in powers of momentum, the low energy constants appearing in the EFT description have been written in terms of the heavy meson parameters. In order to obtain a less model dependent description of the weak decay of hypernuclei we have studied the decay of the lightest hypernucleus, the hypertriton, which can be described within an effective field theory framework in both the strong and the weak sectors
New developments in the weak decay of hypernuclei by Cristian Chumillas Espinosa(
)
2 editions published in 2010 in English and held by 2 WorldCat member libraries worldwide
2 editions published in 2010 in English and held by 2 WorldCat member libraries worldwide
Decay of Doubly Strange Hypernuclei by Jordi Maneu Victoria(
)
1 edition published in 2020 in English and held by 1 WorldCat member library worldwide
"Double § hypernuclei are bound systems of several nucleons and two § hyperons. These systems are unstable with respect to the weak interaction and chiefly decay through twobody processes that conserve neither parity, isospin or strangeness. Among such processes we can find those mediated by the§N ! NN, §§ ! §n and §§ ! ßN reactions but also, thanks to the baryon channel mixing (§N ° ßN, §§ ° •N,§§ ° ßß) made possible by the strong interaction, the weak ßN ! NN, •N ! §n, •N ! ßN, ßß ! §n and ßß ! ßN channels.This work completes the study of the decay of double§ hypernuclei by taking into account the microscopic effects of the strong interaction on two baryon states in strangeness sectors 2, 1 and 0, pertaining to the possible baryonbaryon states appearing in the initial and final states, as previously stated. The initial strangeness °2 wave function is obtained from the solution of a Gmatrix equation with the input of realistic strong baryonbaryon potentials, while the final hyperonnucleon wave functions are derived analogously from a microscopic Tmatrix calculation. Consequently the opening of the channel induced by the •N pair (with a lower energy threshold than that corresponding to the ßß pair) had to be considered. In order to evaluate these new decay channels the potential that governs the •N interaction with a strangeness variation"  TDX
1 edition published in 2020 in English and held by 1 WorldCat member library worldwide
"Double § hypernuclei are bound systems of several nucleons and two § hyperons. These systems are unstable with respect to the weak interaction and chiefly decay through twobody processes that conserve neither parity, isospin or strangeness. Among such processes we can find those mediated by the§N ! NN, §§ ! §n and §§ ! ßN reactions but also, thanks to the baryon channel mixing (§N ° ßN, §§ ° •N,§§ ° ßß) made possible by the strong interaction, the weak ßN ! NN, •N ! §n, •N ! ßN, ßß ! §n and ßß ! ßN channels.This work completes the study of the decay of double§ hypernuclei by taking into account the microscopic effects of the strong interaction on two baryon states in strangeness sectors 2, 1 and 0, pertaining to the possible baryonbaryon states appearing in the initial and final states, as previously stated. The initial strangeness °2 wave function is obtained from the solution of a Gmatrix equation with the input of realistic strong baryonbaryon potentials, while the final hyperonnucleon wave functions are derived analogously from a microscopic Tmatrix calculation. Consequently the opening of the channel induced by the •N pair (with a lower energy threshold than that corresponding to the ßß pair) had to be considered. In order to evaluate these new decay channels the potential that governs the •N interaction with a strangeness variation"  TDX
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Related Identities
 Universitat de Barcelona Departament d'Estructura i Constituents de la Matèria
 Ramos Gómez, Àngels
 Bennhold, Cornelius
 JuliáDíaz, Bruno
 PérezObiol Castañeda, Axel Author
 Chumillas Espinosa, Cristian Author
 Universitat de Barcelona
 Maneu Victoria, Jordi Author
 Espriu, D. (Domènec)
 Universitat de Barcelona Departament de Física Quàntica i Astrofísica