Isovector dipole resonances in {sup 4}He and neutrino-heating in supernova

Journal Article · Tue Jun 01 04:00:00 EDT 2010 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3455951· OSTI ID:21362122

Nakayama, S; Matsumoto, E; Fushimi, K; Hayami, R ^[1]; Suzuki, T ^[2]; Yamagata, T; Akimune, H; Ikemizu, H ^[3]; Fujiwara, M; Hashimoto, H; Kawase, K; Nakanishi, K; Oota, T; Yosoi, M ^[4]; Greenfield, M B ^[5]; Kudoh, T; Sagara, K ^[6]; Tanaka, M ^[7]

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1. Department of Physics, University of Tokushima, Tokushima 770-8502 (Japan)
2. Department of Physics, Nihon University, Tokyo 156-8550 (Japan)
3. Department of Physics, Konan University, Kobe 658-8501 (Japan)
4. Research Center for Nuclear Physics, Osaka University, Osaka 567-0047 (Japan)
5. Department of Physics, International Christian University, Tokyo 181-0015 (Japan)
6. Department of Physics, Kyushu University, Fukuoka 812-8581 (Japan)
7. Kobe Tokiwa College, Kobe 654-0838 (Japan)

We studied transition strengths to isovector dipole resonances (GDR-1-bar , SDR-1-bar , and SDR-2-bar ) in {sup 4}He by using the {sup 4}He({sup 7}Li,{sup 7}Begamma) reaction at 455 MeV and by comparing with shell-model calculations, in order to estimate cross sections of {sup 4}He for reactions induced by neutrinos emitting from a thermalized neutrino-sphere in the type-II supernova. Excitation of the SDR was dominant in the neutrino-heating of {sup 4}He. The {sup 4}He-excitation via neutral-current reactions of nu{sub m}u{sub ,t}au and nu-bar{sub m}u{sub ,t}au was found to be one order of magnitude stronger than that via charged-current reactions of nu{sub e} and nu-bar{sub e}. The total energy-weighted cross section <omegasigma>{sub N} for neutrino-induced neutral-current reactions on {sup 4}He was found to amount to about 1.0x10{sup -40} MeVcentre dotcm{sup 2} which is comparable to those used in the previous simulations. The neutrino-heating effect of {sup 4}He is small in the type-II supernova explosion.

• OSTI ID: 21362122
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1238; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALGEBRAIC CURRENTS
BINARY STARS
CHARGED CURRENTS
CROSS SECTIONS
CURRENTS
DIPOLES
ELECTRON NEUTRINOS
ELEMENTARY PARTICLES
ENERGY-LEVEL TRANSITIONS
ERUPTIVE VARIABLE STARS
EVEN-EVEN NUCLEI
EXCITATION
EXPLOSIONS
FERMIONS
HELIUM 4
HELIUM ISOTOPES
INTERACTIONS
ISOTOPES
ISOVECTORS
LEPTON-BARYON INTERACTIONS
LEPTON-HADRON INTERACTIONS
LEPTON-NUCLEON INTERACTIONS
LEPTONS
LIGHT NUCLEI
LITHIUM 7
LITHIUM ISOTOPES
MASSLESS PARTICLES
MATHEMATICAL MODELS
MULTIPOLES
NEUTRAL CURRENTS
NEUTRINO-NUCLEON INTERACTIONS
NEUTRINOS
NUCLEAR MODELS
NUCLEI
ODD-EVEN NUCLEI
PARTICLE INTERACTIONS
SHELL MODELS
SIMULATION
STABLE ISOTOPES
STARS
SUPERNOVAE
TENSORS
VARIABLE STARS
VECTORS