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Guichon, P.A.M.; Bihoreau, B.; Giffon, M.; Gonçalves, Alexandre B.; Julien, J.; Roussel, L.; Samour, C.

doi:10.1103/physrevc.19.987

Cited by 40 publications

(19 citation statements)

References 26 publications

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“…-f gs is the fraction of captures that results in the formation of 16 N in the ground state, where it will beta decay. f gs is determined by the ratio of the partial capture rates to the ground state producing levels [16,21] to the total capture rate and is found to be 9.0% ± 0.7%. -is the triggering and reconstruction efficiency for 16 N and is determined by MC simulation to be 64.6% ± 0.2%.…”

Section: N From the Dtg Neutron Generatormentioning

confidence: 99%

16N as a calibration source for Super-Kamiokande

Blaufuss¹,

Guillian²,

Fukuda³

et al. 2001

Nuclear Instruments and Methods in Physics Research Section A:

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2The decay of 16 N is used to cross check the absolute energy scale calibration for solar neutrinos established by the electron linear accelerator (LINAC). A deuterium-tritium neutron generator was employed to create 16 N via the (n,p) reaction on 16 O in the water of the detector. This technique is isotropic and has different systematic uncertainties than the LINAC. The results from this high statistics data sample agree with the absolute energy scale of the LINAC to better than 1%. A natural source of 16 N from the capture of µ − on 16 O, which is collected as a background to the solar neutrino analysis, is also discussed.

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Section: N From the Dtg Neutron Generatormentioning

confidence: 99%

16N as a calibration source for Super-Kamiokande

Blaufuss¹,

Guillian²,

Fukuda³

et al. 2001

Nuclear Instruments and Methods in Physics Research Section A:

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“…The fl-decay rate Ap of the 0-(120 keV, ta/2 = 5.25/is) level of 16N to the ground state of 160, and the inverse muon capture rate A,, have generate d considerable interest [1][2][3][4][5][6][7][8][9][10], following a suggestion [1] that the AJAp ratio was essentially nuclear structure independent. It was thought possible to extract from this ratio the induced pseudoscalar coupling constant g/gA" Later calculations [3][4][5][6] have shown that mesonic exchange currents (MEC's) account for about 75 ~ of the fl-decay rate and 35 % of the muon-capture rate.…”

Section: Pacs : 2340 Hcmentioning

confidence: 99%

“…It was thought possible to extract from this ratio the induced pseudoscalar coupling constant g/gA" Later calculations [3][4][5][6] have shown that mesonic exchange currents (MEC's) account for about 75 ~ of the fl-decay rate and 35 % of the muon-capture rate. These transitions can therefore be considered an ideal case for testing our understanding of MEC's.…”

Section: Pacs : 2340 Hcmentioning

confidence: 99%

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New measurement of the beta decay rate of the16N(0?)-16O(0+) transition

et al. 1985

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The beta decay rate of the ~6N(0-;120keV)-,~oo(0+,G.S.) transition has been remeasured. Our result (A~=0.48+0.024s-1) is in excellent agreement with a previous measurement but strongly disagrees with another experimental value. The two agreeing results provide an experimental verification of the importance of meson exchange currents in 0 + -0-weak transitions. A value of gp/ga~ll-12 can be inferred from the corresponding A, rate. PACS : 23.40. HcThe fl-decay rate Ap of the 0-(120 keV, ta/2 = 5.25/is) level of 16N to the ground state of 160, and the inverse muon capture rate A,, have generate d considerable interest [1][2][3][4][5][6][7][8][9][10], following a suggestion [1] that the AJAp ratio was essentially nuclear structure independent. It was thought possible to extract from this ratio the induced pseudoscalar coupling constant g/gA" Later calculations [3][4][5][6] have shown that mesonic exchange currents (MEC's) account for about 75 ~ of the fl-decay rate and 35 % of the muon-capture rate. These transitions can therefore be considered an ideal case for testing our understanding of MEC's. Several measurements of A~ have been reported [7][8][9][10]. Gagliardi and Garvey [8] confirmed with much better statistics (,--5 %) the experiment of Palffy etal. [7], using the same experimental technique. Our group had reported a value of A s [9], in agreement with those of [7] and [8] with a different setup. Since then, another value has been published [10], obtained with a method similar to ours, but differing by 35 % from the previous measurements. We report here our final measurement of the 0---+0 + decay. The principle of the measurement is the following:

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“…3) and can be evaluated from a low-energy theorem based on PCAC and current algebra (12,13). The result, to leading order in (l/M), is given entirely by the seagull term + -+ + where rlj = ri -r , [ As in the earlier example of VpNC, one can reduce MoSo(2) to an effective one-body operator by averaging over core nucleons.…”

mentioning

confidence: 99%

Parity nonconservation in the nucleon–nucleon system: nuclear structure issues

Haxton¹

1988

Can. J. Phys.

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I discuss some of the nuclear structure issues that arise in nuclear tests of parity nonconservation Je discute quelques-uns des effets de la structure nucliaire qu Can J Phys 66. 503 (1988) To date we have only one definitive measurement of parity nonconservation (PNC) in the two-nucleon system: the analyzing power in the $ + p system for longitudinally polarized protons (1). Since matrix elements of the weak NN interaction depend on five elementary S-P amplitudes, experimentalists have turned to few-nucleon and nuclear systems to obtain additional constraints. This has the somewhat regrettable consequence that the complications of the nuclear many-body problem must be surmounted for one to be able to relate experimental observables to the underlying two-nucleon amplitudes. I would like to discuss some of the techniques that have been developed for this purpose and point out some of their apparent limitations. A more complete discussion of these matters can be found in the review by Adelberger and Haxton (2).Modem PNC experiments concentrate on special transitions involving parity doublets, closely spaced pairs of states having identical spins but opposite parities. Some examples are shown in Fig. 1. If the separation AE between the doublet states is sufficiently small, the parity admixing with more distant states can be ignored. In Fig. 1 both AE and AE', the next smallest energy denominator governing parity mixing, are given. The two-level mixing approximation greatly simplifies the task of the nuclear theoretician: he is only asked to provide accurate wave functions for doublet states, and perhaps for a third state to which they may decay. Typically, the doublet states are low-lying levels in well studied nuclei, so that electromagnetic decay rates, spectroscopic factors, and other information may provide checks on the nuclear wave functions.An important example is the 0+1 * 0-0 doublet at E,, -1 MeV in "F, as illustrated in Fig. 1. The energy denominator, AE = 39 keV, is favorable. Assuming that a two-state approximation is valid, the weak interaction mixes these states 10-0; E,, = 1.08MeV) + 10-0) + e10+1)where VpNc is the weak NN potential. The 0-and Of levels decay by dipole transitions to the I + ground state of I8F. Because the A1 = 0 E 1 decay of the 0-level is isospin forbidden, this state has a comparatively long lifetime, T-= 27.5 t 1 .9 ps. In contrast, the A1 = 1 M1 decay of the 0+ level is isospin favored and fast, T + = 2.5 t 0.3 fs, rendering it one of the strongest known M1 transitions (10.3 * 1.5 Weisskopf units (W.U.)). Because of this large difference in lifetimes, a small admixture of the 0+ state into the 0-level produces a sizeable circular polarization: i apparaissent dans les tests de non-conservation de la paritC.[Traduit par la revue]As 1 /~ cc I( f lTYli)l2~$, the magnitude of the dipole matrix elements can be determined from the known lifetimes of the 1.04 and 1.08 MeV states, yieldingThe factor (gslTf"ag~~l+)/(gslTfl;~I-) can be regarded as an "amplifier" of the PNC effect. The...

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μ−partial capture rates inO16

Cited by 40 publications

References 26 publications

16N as a calibration source for Super-Kamiokande

16N as a calibration source for Super-Kamiokande

New measurement of the beta decay rate of the16N(0?)-16O(0+) transition

Parity nonconservation in the nucleon–nucleon system: nuclear structure issues

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